JP2015034798A - Burying disposal facility for radioactive waste - Google Patents

Burying disposal facility for radioactive waste Download PDF

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JP2015034798A
JP2015034798A JP2013167097A JP2013167097A JP2015034798A JP 2015034798 A JP2015034798 A JP 2015034798A JP 2013167097 A JP2013167097 A JP 2013167097A JP 2013167097 A JP2013167097 A JP 2013167097A JP 2015034798 A JP2015034798 A JP 2015034798A
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facility
monitoring
drainage
radioactive waste
mine
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JP6238049B2 (en
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石井　卓
Taku Ishii
卓 石井
知成 白石
Tomonari Shiraishi
知成 白石
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Shimizu Construction Co Ltd
Shimizu Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a burying disposal facility for radioactive waste capable of reducing load in monitor work and contamination disposal work of the radioactive waste.SOLUTION: A floor plate structure 2 is disposed between a bottom part of a facility body 1 storing a waste body 13 and a lower soil 100. The facility body 1 has a water discharge zone 16 which surrounds an inside along an inner peripheral surface of a facility skeleton 12 and has a discharge port 16a at a lower part. Between the water discharge zone 16 and a monitor mine 3 for monitoring water discharge from the water discharge zone 16, an inspection water discharge pipe 17 for guiding water discharge from the water discharge zone 16 to the monitor mine 3 is provided. Underground water immersed from soil around the facility body 1 to the facility body 1 or leakage water discharged from the facility body 1 is guided to the water discharge zone 16 as discharged water, in addition, via the inspection water discharge pipe 17, the discharged water is guided to the monitor mine 3 for monitoring a radioactive contamination degree of the discharged water.

Description

この発明は、放射線廃棄物の監視作業や汚染処理作業の負荷を軽減することができる放射性廃棄物の埋設処分施設に関する。   The present invention relates to a radioactive waste embedding disposal facility capable of reducing the load of radiation waste monitoring work and contamination treatment work.

原子力発電所の操業あるいは廃炉に伴って発生する放射性廃棄物は、比較的浅い深さの地中埋設施設に格納して埋設処分される。この施設は、例えば非特許文献１によれば、コンクリートビット型の施設である。   Radioactive waste generated during nuclear power plant operations or decommissioning is stored in landfill facilities at a relatively shallow depth for disposal. This facility is a concrete bit type facility according to Non-Patent Document 1, for example.

また、非特許文献２によれば、このような地中埋設施設では事業の進展に沿って、段階的な安全性の管理が行われる。第１段階では埋設施設の躯体は埋設されていない状態であり、埋設設備からの排水及び監視が行われる。さらに、第２段階では埋設施設の躯体は覆土で覆われて埋設されるが、埋設設備からの排水及び監視が引き続き行われる。その後、埋設設備からの排水及び監視は実施せずに、主に周辺土壤等により放射性物質の漏出は抑制されて安全性が確保される。   According to Non-Patent Document 2, in such underground facilities, safety management is performed in stages as the business progresses. In the first stage, the housing of the buried facility is not buried, and drainage and monitoring from the buried facility are performed. Furthermore, in the second stage, the skeleton of the burial facility is covered and buried, but drainage and monitoring from the burial facility will continue. After that, drainage from the buried facilities and monitoring are not carried out, and leakage of radioactive materials is suppressed mainly by the surrounding soil, etc., and safety is ensured.

すなわち、第１段階および第２段階の期間では、埋設設備からの排水及び監視を実施できることが必要である。この排水及び監視を実施できるようにするために、廃棄体の周囲に多重構造の埋設設備が構築される。この結果、埋設施設の躯体内部からの漏水は点検路に集水して監視することができる。   That is, in the period of the first stage and the second stage, it is necessary to be able to perform drainage and monitoring from the buried facilities. In order to be able to carry out this drainage and monitoring, a multi-structure embedded facility is constructed around the waste. As a result, leakage from the interior of the buried facility can be monitored by collecting water in the inspection path.

特許第４６８７９３９号公報Japanese Patent No. 4687939

”埋設事業，埋設設備の構造”［online］、２００８年、日本原燃株式会社、［平成２５年８月６日検索］、インターネット＜http://www.jnfl.co.jp/business-cycle/llw/structure.html＞"Embedded business, structure of buried equipment" [online], 2008, Japan Nuclear Fuel Co., Ltd. [searched August 6, 2013], Internet <http://www.jnfl.co.jp/business-cycle /llw/structure.html> ”埋設事業，埋設後の段階管理”［online］、２００８年、日本原燃株式会社、［平成２５年８月６日検索］、インターネット＜http://www.jnfl.co.jp/business-cycle/llw/phase.html＞"Embedding business, stage management after burial" [online], 2008, Japan Nuclear Fuel Co., Ltd. [searched August 6, 2013], Internet <http://www.jnfl.co.jp/business- cycle / llw / phase.html> ”工法概要”［online］、ピングラウト協議会、［平成２５年７月３１日検索］、インターネット＜http://www.pigrout.com/method.html＞“Outline of Construction Method” [online], Pinglaut Council, [searched July 31, 2013], Internet <http://www.pigrout.com/method.html>

しかしながら、埋設施設の躯体から排水を継続すると、躯体内部に向かって周囲の地盤からの地下水が浸透してくる。埋設施設の下にある地盤から埋設施設の底面に浸入した地下水は、廃棄体に比較的近い位置の排水ゾーンを通ってから点検路に集水されることになる。埋設施設の側部もしくは上部にある地盤から埋設施設内部に浸入する地下水は、廃棄体に接触する可能性があるのに対して、埋設施設の下にある地盤からの地下水は、廃棄体に接触する可能性が低い。この両者の地下水が混じって点検路に集水することによって、監視対象となる湧水の量が大きくなる。これによって、放射性廃棄物の監視作業や万一の汚染処理作業の負荷が大きくなるという問題があった。   However, if drainage is continued from the skeleton of the buried facility, groundwater from the surrounding ground permeates into the skeleton. Groundwater that has entered the bottom of the buried facility from the ground below the buried facility passes through a drainage zone that is relatively close to the waste and is collected in the inspection channel. Groundwater entering the burial facility from the ground at the side or top of the burial facility may come into contact with the waste, whereas groundwater from the ground under the burial facility contacts the waste. Is less likely to do. The amount of spring water to be monitored increases by collecting both groundwaters and collecting them on the inspection road. As a result, there has been a problem that the load of the radioactive waste monitoring work and the contamination processing work should be increased.

この発明は、上記に鑑みてなされたものであって、放射線廃棄物の監視作業や汚染処理作業の負荷を軽減することができる放射性廃棄物の埋設処分施設を提供することを目的とする。   The present invention has been made in view of the above, and an object thereof is to provide a radioactive waste embedding disposal facility capable of reducing the load of radiation waste monitoring work and contamination treatment work.

上述した課題を解決し、目的を達成するために、この発明にかかる放射性廃棄物の埋設処分施設は、放射性廃棄物を地中に埋設処分する放射性廃棄物の埋設処分施設において、放射性廃棄物入り容器を格納した施設躯体または格納容器の底部と下部地盤との間に床板構造体を設け、前記施設躯体または前記格納容器は、前記施設躯体または前記格納容器の内周面もしくは外周面に沿って内部を囲み、下部に排出口を有する排水ゾーンが形成され、前記排水ゾーンと前記排水ゾーンからの排水を監視する監視坑との間には前記排水ゾーンからの排水を前記監視坑に導く点検排水管が設けられ、周囲の地盤から前記施設躯体もしくは前記格納容器に浸入してくる地下水または前記施設躯体もしくは前記格納容器から浸出してくる漏水を排水として前記排水ゾーンに導き、さらに前記点検排水管を介して前記監視坑に導いて前記排水の放射能汚染度を監視することを特徴とする。   In order to solve the above-described problems and achieve the object, the radioactive waste embedding disposal facility according to the present invention is a radioactive waste embedding disposal facility for embedding radioactive waste in the ground. A floor plate structure is provided between the bottom of the facility housing or the storage container and the lower ground, and the facility housing or the storage container is disposed along an inner peripheral surface or an outer peripheral surface of the facility housing or the storage container. A drainage zone having a discharge port at a lower portion thereof, and a drainage pipe for leading the drainage from the drainage zone to the monitoring pit between the drainage zone and the monitoring pit for monitoring drainage from the drainage zone The groundwater that infiltrates from the surrounding ground into the facility enclosure or the containment vessel or the water that leaks out from the facility enclosure or the containment vessel is used as drainage. Led to serial drainage zone, characterized by monitoring the radioactive contamination of the waste water is guided to the monitor mine further through the inspection drain.

また、この発明にかかる放射性廃棄物の埋設処分施設は、上記の発明において、前記監視坑は、前記床板構造体内に設けられることを特徴とする。   Moreover, the radioactive waste embedding disposal facility according to the present invention is characterized in that, in the above invention, the monitoring pit is provided in the floor board structure.

また、この発明にかかる放射性廃棄物の埋設処分施設は、上記の発明において、前記施設躯体または前記格納容器の底板は、前記床板構造体であることを特徴とする。   Moreover, the radioactive waste embedding disposal facility according to the present invention is characterized in that, in the above invention, the facility housing or the bottom plate of the containment vessel is the floor plate structure.

また、この発明にかかる放射性廃棄物の埋設処分施設は、上記の発明において、前記床板構造体は、下部地盤から前記床板構造体を通過して前記施設躯体または前記格納容器に向かって流れる地下水を前記監視坑に集水することを特徴とする。   Further, in the above-described invention, the radioactive waste embedding / disposal facility according to the present invention is characterized in that the floor board structure is configured to receive groundwater flowing from a lower ground through the floor board structure toward the facility housing or the containment vessel. Water is collected in the monitoring pit.

また、この発明にかかる放射性廃棄物の埋設処分施設は、上記の発明において、前記監視坑は、坑内領域に監視員が入ることができない大きさであり、前記監視坑の末端に設けられた連絡坑道内に移動可能な監視装置が設けられ、前記監視装置は、前記排水の湧出状態の監視及び／または前記排水のサンプリングによる分析測定を行うことを特徴とする。   Further, the radioactive waste embedding disposal facility according to the present invention is the above-mentioned invention, wherein the monitoring mine is of a size that a monitoring person cannot enter the mine area, and is provided at the end of the monitoring mine. A monitoring device movable in the mine shaft is provided, and the monitoring device monitors the discharge state of the drainage and / or performs analytical measurement by sampling the drainage.

また、この発明にかかる放射性廃棄物の埋設処分施設は、上記の発明において、前記床板構造体は、底板、側壁、及び天板を有する箱型躯体であり、前記監視坑の床面積は、前記床板構造体の底面積の１／２以上であることを特徴とする。   Further, in the above-mentioned invention, the radioactive waste embedding disposal facility according to the present invention is such that the floor plate structure is a box-type housing having a bottom plate, a side wall, and a top plate, and the floor area of the monitoring mine is It is characterized by being 1/2 or more of the bottom area of the floorboard structure.

また、この発明にかかる放射性廃棄物の埋設処分施設は、上記の発明において、前記監視坑は、並行して複数配置され、隣接する監視坑間をつなぎ前記監視坑に直交する方向に配置される複数の排水孔が設けられ、下部地盤から前記床板構造体を通過して前記施設躯体または前記格納容器に向かって流れる地下水を前記排水孔に湧出させ、この排水孔に湧出した排水を前記監視坑に集水することを特徴とする。   Further, in the above-described invention, the radioactive waste embedding disposal facility according to the present invention includes a plurality of the monitoring pits arranged in parallel and arranged in a direction perpendicular to the monitoring mine by connecting adjacent monitoring pits. A plurality of drain holes are provided, and groundwater flowing from the lower ground through the floor structure toward the facility housing or the containment vessel is caused to flow out to the drain hole, and the drained water discharged from the drain hole is discharged to the monitoring well. It is characterized by collecting water.

また、この発明にかかる放射性廃棄物の埋設処分施設は、上記の発明において、下部地盤、下部地盤の上部表面部を平滑にするための均しコンクリート、または下部岩盤面と、前記床板構造体との間に、止水材が敷設されていることを特徴とする。   Further, the radioactive waste embedding disposal facility according to the present invention is the above-described invention, wherein the lower ground, the leveled concrete for smoothing the upper surface portion of the lower ground, or the lower rock surface, the floor plate structure, A water-stop material is laid between the two.

この発明によれば、放射性廃棄物入り容器を格納した施設躯体または格納容器の底部と下部地盤との間に床板構造体を設け、前記施設躯体または前記格納容器は、前記施設躯体または前記格納容器の内周面もしくは外周面に沿って内部を囲み、下部に排出口を有する排水ゾーンが形成され、前記排水ゾーンと前記排水ゾーンからの排水を監視する監視坑との間には前記排水ゾーンからの排水を前記監視坑に導く点検排水管が設けられ、周囲の地盤から前記施設躯体もしくは前記格納容器に浸入してくる地下水または前記施設躯体もしくは前記格納容器から浸出してくる漏水を排水として前記排水ゾーンに導き、さらに前記点検排水管を介して前記監視坑に導いて前記排水の放射能汚染度を監視するようにしているので、放射線廃棄物の監視作業や汚染処理作業の負荷を軽減することができる。   According to this invention, the floor structure is provided between the bottom of the facility housing or the storage container storing the radioactive waste container or the lower ground, and the facility housing or the storage container is the facility housing or the storage container. A drainage zone that surrounds the inside or the outer peripheral surface and has a discharge port at the bottom is formed. Between the drainage zone and the monitoring mine that monitors drainage from the drainage zone, An inspection drain pipe is provided for guiding drainage to the monitoring pit, and the drainage is drained by groundwater entering the facility enclosure or the containment vessel from the surrounding ground or leaking water leaking from the facility enclosure or the containment vessel. Since it is led to the zone and further led to the monitoring mine via the inspection drainage pipe, the radioactive contamination level of the drainage is monitored. It is possible to reduce the load of and pollution treatment work.

図１は、この発明の実施の形態１である放射性廃棄物の埋設処分施設の概要構成を示す断面図である。1 is a cross-sectional view showing a schematic configuration of a radioactive waste embedding disposal facility according to Embodiment 1 of the present invention. 図２は、図１に示した埋設処分施設の詳細構成を示す断面図である。2 is a cross-sectional view showing a detailed configuration of the buried disposal facility shown in FIG. 図３は、この発明の実施の形態２である放射性廃棄物の埋設処分施設の概要構成を示す断面図である。FIG. 3 is a cross-sectional view showing a schematic configuration of a radioactive waste embedding disposal facility according to Embodiment 2 of the present invention. 図４は、実施の形態１，２の構成に対する止水処理などの補修方法の概要を説明する説明図である。FIG. 4 is an explanatory diagram for explaining an outline of a repair method such as a water stop treatment for the configurations of the first and second embodiments. 図５は、この発明の実施の形態３である放射性廃棄物の埋設処分施設の概要構成を示す断面図である。FIG. 5 is a sectional view showing a schematic configuration of a radioactive waste embedding disposal facility according to Embodiment 3 of the present invention. 図６は、実施の形態３の構成に対する止水処理などの補修方法の概要を説明する説明図である。FIG. 6 is an explanatory diagram for explaining an outline of a repair method such as a water stop treatment for the configuration of the third embodiment. 図７は、この発明の実施の形態４である放射性廃棄物の埋設処分施設の概要構成を示す断面図である。FIG. 7 is a sectional view showing a schematic configuration of a radioactive waste embedding disposal facility according to Embodiment 4 of the present invention. 図８は、この発明の実施の形態５である放射性廃棄物の埋設処分施設の概要構成を示す断面図である。FIG. 8 is a sectional view showing a schematic configuration of a radioactive waste embedding disposal facility according to the fifth embodiment of the present invention. 図９は、この発明の実施の形態６である放射性廃棄物の埋設処分施設の斜視図である。FIG. 9 is a perspective view of a radioactive waste embedding disposal facility according to Embodiment 6 of the present invention. 図１０は、この発明の実施の形態６である放射性廃棄物の埋設処分施設の概要構成を示す断面図である。FIG. 10 is a sectional view showing a schematic configuration of a radioactive waste embedding disposal facility according to Embodiment 6 of the present invention. 図１１は、この発明の実施の形態６の変形例である放射性廃棄物の埋設処分施設の概要構成を示す断面図である。FIG. 11 is a cross-sectional view showing a schematic configuration of a radioactive waste embedding disposal facility that is a modification of the sixth embodiment of the present invention. 図１２は、施設躯体を、放射性廃棄物を直接格納できる複数の大型の格納容器に替えた一例である放射性廃棄物の埋設処分施設の概要構成を示す断面図である。FIG. 12 is a cross-sectional view showing a schematic configuration of a radioactive waste embedding disposal facility which is an example in which the facility housing is replaced with a plurality of large storage containers capable of directly storing radioactive waste.

以下、添付図面を参照してこの発明を実施するための形態について説明する。   DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.

（実施の形態１）
図１は、この発明の実施の形態１である放射性廃棄物の埋設処分施設の概要構成を示す断面図である。また、図２は、図１に示した埋設処分施設の詳細構成を示す断面図である。図１及び図２に示すように、埋設処分施設は、施設本体１と、床板構造体２とを有し、地中に埋設される。床板構造体２は、埋設空間１０１を形成する岩盤などの下部地盤１００上に配置される。施設本体１は、床板構造体２の上部に配置される。 (Embodiment 1)
1 is a cross-sectional view showing a schematic configuration of a radioactive waste embedding disposal facility according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view showing a detailed configuration of the buried disposal facility shown in FIG. As shown in FIGS. 1 and 2, the buried disposal facility has a facility main body 1 and a floor board structure 2 and is buried in the ground. The floor board structure 2 is disposed on a lower ground 100 such as a rock that forms the embedded space 101. The facility main body 1 is disposed on the upper part of the floor board structure 2.

施設本体１は、施設躯体１２内で、放射性廃棄物がドラム缶などに詰められた複数の廃棄体１３がモルタルで充填された状態となっている。施設躯体１２は、複数の有底の容器を形成するＲＣ躯体１０と、これらの容器の蓋となる複数のＰＣ（プレキャスト）板１１とを有し、複数の格納容器を形成する。この格納容器内には、複数の廃棄体１３が格納される。複数の廃棄体１３は、隙間なくモルタルで充填された充填モルタル廃棄体１５として形成されるとともに、同時に、充填モルタル廃棄体１５と施設躯体１２との間にモルタルが充填されてホワイトゾーン１４を形成する。複数の廃棄体１３と施設躯体１２との間にモルタルを充填するのは、放射性物質をモルタル材に収着させて廃棄体周囲の間隙水の汚染濃度を低下させるためである。また、ホワイトゾーン１４は、放射性廃棄物の拡散抑制を期待するためである。   The facility main body 1 is in a state where a plurality of waste bodies 13 filled with radioactive waste in drums or the like are filled with mortar in a facility housing 12. The facility housing 12 includes an RC housing 10 that forms a plurality of bottomed containers and a plurality of PC (precast) plates 11 that serve as lids for these containers, and forms a plurality of storage containers. A plurality of waste bodies 13 are stored in the storage container. The plurality of waste bodies 13 are formed as filled mortar waste bodies 15 filled with mortar without gaps, and at the same time, mortar is filled between the filled mortar waste bodies 15 and the facility housing 12 to form a white zone 14. To do. The reason why the mortar is filled between the plurality of waste bodies 13 and the facility housing 12 is to sorb the radioactive substance to the mortar material and reduce the contamination concentration of pore water around the waste bodies. Further, the white zone 14 is for expecting to suppress the diffusion of radioactive waste.

また、施設躯体１２の内周面には、水を通しやすい多孔質のコンクリート（ポーラスコンクリート）層で形成された排水ゾーン１６が内部の複数の廃棄体１３を囲むように形成される。この排水ゾーン１６は、施設躯体１２の外周面に形成されてもよい。また、排水ゾーン１６は、下部に排出口１６ａを有する。   In addition, a drainage zone 16 formed of a porous concrete (porous concrete) layer through which water easily passes is formed on the inner peripheral surface of the facility housing 12 so as to surround the plurality of waste bodies 13 inside. The drainage zone 16 may be formed on the outer peripheral surface of the facility housing 12. Moreover, the drainage zone 16 has the discharge port 16a in the lower part.

一方、床板構造体２は、施設躯体１２と同様にコンクリートで形成され、ひび割れが発生してもよく、数十年程度維持する強度をもつ。床板構造体２内には、監視坑３が設けられる。監視坑３と排出口１６ａとは、点検排水管１７で接続される。監視坑３は、監視員が入れる広さを有する。監視坑３内には、上部の埋設設備からの排水を集水し、排水管４ｂを介して地上に排水する排水装置４を有する。排水装置４は、施設躯体１２側から流入する排水をサンプリングし、分析測定することによって放射能汚染度を監視する。また、監視坑３内の下部には、床板構造体２の下部から地下水を貯留する貯留部５ａと、この貯留部５ａに貯留した地下水を、排水管５ｂを介して地上に排水する排水装置５を有する。なお、監視坑３と地上との間には、監視員が監視坑３に立ち入る際に通ることができる図示しない立坑が設けられる。上述した排水管４ｂ，５ｂは、この立坑内に沿って配置される。   On the other hand, the floorboard structure 2 is made of concrete like the facility housing 12, may be cracked, and has the strength to maintain for several decades. A monitoring pit 3 is provided in the floorboard structure 2. The monitoring pit 3 and the discharge port 16a are connected by an inspection drain pipe 17. The monitoring pit 3 is large enough for a monitoring person to enter. The monitoring pit 3 has a drainage device 4 that collects drainage from the upper buried facility and drains it to the ground via a drainage pipe 4b. The drainage device 4 monitors the radioactive contamination level by sampling and analyzing the wastewater flowing in from the facility housing 12 side. Moreover, in the lower part in the monitoring mine 3, the storage part 5a which stores groundwater from the lower part of the floor board structure 2, and the drainage apparatus 5 which drains the groundwater stored in this storage part 5a to the ground via the drain pipe 5b. Have In addition, a shaft (not shown) is provided between the monitoring pit 3 and the ground, through which a supervisor can pass when entering the monitoring pit 3. The drain pipes 4b and 5b described above are arranged along the shaft.

図２に示すように、施設躯体１２の上部及び側部から浸入してくる地下水または施設躯体１２から浸出してくる漏水は、排水として排水ゾーン１６に導かれ、さらに点検排水管１７を介して排水装置４に導かれる。一方、床板構造体２の下部地盤１００から施設躯体１２に向かって流れる地下水は、床板構造体２を通過して監視坑３内に集水される。したがって、床板構造体２の下部地盤１００から施設躯体１２に向かって流れる地下水が施設躯体１２側に流れるのを抑制することができる。すなわち、排水ゾーン１６から流れる監視対象の排水と、床板構造体２の下部地盤１００から施設躯体１２に向かって流れる地下水とを分離することができ、排水ゾーン１６から流れる監視対象の排水のみを監視すればよい。   As shown in FIG. 2, the groundwater entering from the upper part and the side part of the facility housing 12 or the water leaking out from the facility housing 12 is led to the drainage zone 16 as drainage, and further through the inspection drainage pipe 17. Guided to the drainage device 4. On the other hand, groundwater flowing from the lower ground 100 of the floor board structure 2 toward the facility housing 12 passes through the floor board structure 2 and is collected in the monitoring pit 3. Therefore, it is possible to suppress the underground water flowing from the lower ground 100 of the floor board structure 2 toward the facility housing 12 to the facility housing 12 side. That is, the drainage of the monitoring target flowing from the drainage zone 16 and the groundwater flowing from the lower ground 100 of the floor structure 2 toward the facility frame 12 can be separated, and only the monitoring target drainage flowing from the drainage zone 16 is monitored. do it.

なお、非特許文献２に記載されているように、埋設処分施設では、第１段階と第２段階とで排水の監視が行われる。第１段階から第２段階に移る際、埋設処分施設の上面及び側面は、ベントナイトを混合したベントナイト混合土１０２で締め固められ、岩盤などの下部地盤１００よりも水を通し難くしている。   In addition, as described in Non-Patent Document 2, wastewater is monitored in the first stage and the second stage in the buried disposal facility. When moving from the first stage to the second stage, the upper surface and the side surface of the buried disposal facility are compacted with bentonite mixed soil 102 mixed with bentonite, making it difficult for water to pass through the lower ground 100 such as rock.

この実施の形態１では、廃棄体１３を有する施設本体１と下部地盤１００との間に床板構造体２を設け、排水ゾーン１６から流れる監視対象の排水と、床板構造体２の下部地盤１００から施設躯体１２に向かって流れる地下水とを分離することができるため、検査対象の水量が減り、監視作業の負荷が軽減される。   In the first embodiment, the floor board structure 2 is provided between the facility main body 1 having the waste body 13 and the lower ground 100, and the monitored drainage flowing from the drainage zone 16 and the lower ground 100 of the floor board structure 2 are provided. Since the groundwater flowing toward the facility housing 12 can be separated, the amount of water to be inspected is reduced, and the monitoring work load is reduced.

また、床板構造体２は、施設本体１よりも下方に配置されるため、施設本体１から漏出した排水は、重力によって施設本体１の下方の床板構造体２側に導かれる。この結果、床板構造体２に設けられた監視坑３で施設本体１側からの排水を確実に集水することができる。   Moreover, since the floor board structure 2 is arrange | positioned below the facility main body 1, the waste_water | drain leaking from the facility main body 1 is guide | induced to the floor board structure 2 side below the facility main body 1 by gravity. As a result, the drainage from the facility main body 1 can be reliably collected by the monitoring pit 3 provided in the floor board structure 2.

さらに、下部地盤１００から上方に向かって施設本体１側に浸入しようとする地下水は、放射性廃棄物に接触することなく、床板構造体２を介して監視坑３に確実に集水され、排水することができる。   Furthermore, the groundwater which is going to enter the facility main body 1 side upward from the lower ground 100 is surely collected and drained to the monitoring mine 3 via the floor plate structure 2 without contacting the radioactive waste. be able to.

（実施の形態２）
この実施の形態２は、図３に示すように、施設本体１の底板を床板構造体２とする施設本体２１としている。すなわち、施設躯体１２はＲＣ躯体１０の底板をなくしたものであり、施設躯体１２の底板を床板構造体２としている。この場合、格納容器のホワイトゾーン１４と床板構造体２との間には、排水ゾーン１６が形成されている。 (Embodiment 2)
In the second embodiment, as shown in FIG. 3, a facility body 21 having a floor plate structure 2 as a bottom plate of the facility body 1 is used. That is, the facility housing 12 is obtained by eliminating the bottom plate of the RC housing 10, and the bottom plate of the facility housing 12 is the floor plate structure 2. In this case, a drainage zone 16 is formed between the white zone 14 of the storage container and the floorboard structure 2.

この実施の形態２では、床板構造体２の構造を施設本体２１の底板として兼用しているので、埋設処分施設の構造が簡易となり、埋設処分施設のコンパクト化を図ることができる。   In the second embodiment, since the structure of the floor board structure 2 is also used as the bottom plate of the facility main body 21, the structure of the buried disposal facility is simplified, and the buried disposal facility can be made compact.

ここで、実施の形態１，２では、従来に比して監視坑３の領域が広く、かつ施設本体１，２１の下方に存在するため、埋設処分施設の修復が容易となる。すなわち、埋設処分施設の第１段階では、ベントナイト混合土１０２を埋めない状態で監視を行うが、この第１段階では、埋設処分施設の修復を行うことが求められる。この実施の形態１，２では、施設本体１，２１の下方に監視坑３が設けられているため、埋設処分施設の修復を容易に行うことができる。たとえば、図４に示すように、床板構造体２にひび割れ等の水みち２３が発生した場合、この水みち２３の発生の場所を特定しやすい。   Here, in Embodiments 1 and 2, since the area of the monitoring mine 3 is larger than that of the conventional one and exists below the facility main bodies 1 and 21, it is easy to repair the buried disposal facility. That is, in the first stage of the buried disposal facility, monitoring is performed without filling the bentonite mixed soil 102, but in the first stage, it is required to repair the buried disposal facility. In the first and second embodiments, since the monitoring pit 3 is provided below the facility main bodies 1 and 21, the buried disposal facility can be repaired easily. For example, as shown in FIG. 4, when a water groove 23 such as a crack is generated in the floor board structure 2, it is easy to specify the location where the water groove 23 is generated.

なお、床板構造体２にひび割れ等の水みち２３が発生した場合、第２段階である埋め戻し後においても止水処理等の補修が可能である。この補修方法としては、例えば、第１の補修方法として、図４に示すように、ひび割れ調査兼止水剤注入管３２を介して浸水性一液型ポリウレタン樹脂をひび割れに注入し、ひび割れに存在している水と反応させてシールする方法がある（非特許文献３参照）。あるいは、第２の補修方法として、エタノール水とベントナイトとを混合して作られるエタノール・ベントナイトスラリーを注入して埋設処分施設の遮水性を改良する方法がある（特許文献１参照）。または、第３の補修方法として、セメント系材料をグラウトして遮水する方法がある。   In the case where a water groove 23 such as a crack is generated in the floor board structure 2, repair such as a water stop treatment can be performed even after the second stage of backfilling. As this repairing method, for example, as shown in FIG. 4, as a first repairing method, a water-immersed one-component polyurethane resin is injected into the crack through the crack investigation / water-stopper injection pipe 32 and exists in the crack. There is a method of sealing with reacting water (see Non-Patent Document 3). Alternatively, as a second repair method, there is a method of injecting an ethanol / bentonite slurry made by mixing ethanol water and bentonite to improve the water shielding property of the buried disposal facility (see Patent Document 1). Or as a 3rd repair method, there exists the method of grouting cementitious material and water-blocking.

（実施の形態３）
上述した実施の形態１，２では、床板構造体２内に３つの監視坑３を設けるようにしていたが、この実施の形態３では、監視坑３の床面積が床板構造体２の床面積の１／２以上となるようにしている。すなわち、監視坑３の領域を広げた構造としている。 (Embodiment 3)
In the first and second embodiments described above, the three monitoring pits 3 are provided in the floorboard structure 2, but in this third embodiment, the floor area of the monitoring mine 3 is the floor area of the floorboard structure 2. It is made to become 1/2 or more. That is, the structure of the monitoring pit 3 is widened.

このため、この実施の形態３では、図５に示すように、床板構造体２を、底板２ａ、側壁２ｂ、天板２ｃによる箱型躯体としている。   For this reason, in this Embodiment 3, as shown in FIG. 5, the floor-plate structure 2 is made into the box-type housing by the baseplate 2a, the side wall 2b, and the top plate 2c.

この実施の形態３では、実施の形態１，２に比して監視坑３の領域が広がったため、さらに埋設処分施設の修復を容易に行うことができる。特に、施設本体１の底板の真下に監視坑３を設けることができるため、実施の形態１，２に比して修復を容易に行うことができる。特に図６に示すように、短い止水剤注入管３３を用いて、ひび割れなどに対する止水処理などの修復を容易に行うことができる。   In this Embodiment 3, since the area | region of the monitoring well 3 expanded compared with Embodiment 1, 2, the restoration of a buried disposal facility can be performed easily. In particular, since the monitoring pit 3 can be provided directly under the bottom plate of the facility main body 1, it can be easily repaired as compared with the first and second embodiments. In particular, as shown in FIG. 6, using a short water-stopping agent injection pipe 33, repair such as water-stopping treatment for cracks and the like can be easily performed.

（実施の形態４）
この実施の形態４では、図７に示すように、複数の監視坑３を並行配置し、隣接する監視坑３間をつなぎ監視坑３に直交する方向に複数の排水孔２２を配置している。この排水孔２２は、下部地盤１００から床板構造体２を通過して施設本体１に向かって流れる地下水を排水孔２２内に湧出させ、この排水孔２２に湧出した排水を監視坑３に集水するようにしている。 (Embodiment 4)
In the fourth embodiment, as shown in FIG. 7, a plurality of monitoring wells 3 are arranged in parallel, and a plurality of drain holes 22 are arranged in a direction perpendicular to the monitoring well 3 by connecting adjacent monitoring wells 3. . The drainage hole 22 causes groundwater flowing from the lower ground 100 through the floor plate structure 2 toward the facility body 1 to flow into the drainage hole 22, and collects the drainage discharged from the drainage hole 22 in the monitoring pit 3. Like to do.

この実施の形態４では、床板構造体２に排水孔２２を設けることによって、さらに地下水の集水を容易にするとともに、この地下水が施設本体１側に流れるのを抑えることができる。   In this Embodiment 4, by providing the drain hole 22 in the floor board structure 2, it is possible to further facilitate the collection of groundwater and to prevent the groundwater from flowing to the facility body 1 side.

（実施の形態５）
この実施の形態５では、図８に示すように、監視坑４３が、坑内領域に監視員が入ることができない大きさにしている。また、図９に示すように、床板構造体４３の監視坑４３の末端に連結し、監視員が立ち入り可能な連絡坑道４４を有する。さらに、この連絡坑道４４の一端には、監視員が地上と連絡坑道４４との間の出入りを可能にする立坑４６が設けられている。監視坑４３は、連絡坑道４４に向かって鉛直下方に下がる勾配が形成されている。したがって、監視坑４３に湧出された排水は、連絡坑道４４側に集水される。連絡坑道４４に集水された排水は、立坑４６の下端に設けられた排水装置４７によって地上に排水される。連絡坑道４４内には、少なくとも、監視坑４３内の排水の湧出状態を監視する移動可能な監視装置４５が設けられている。監視装置４５は、排水の湧出状態の監視及び／または排水のサンプリングによる分析測定を行う。ここで、遠隔監視を行う場合には、地上に設置された図示しない監視制御装置の制御のもとに、監視装置４５を遠隔制御する。また、監視員が直接監視を行う場合は、監視員の操作のもと、監視装置４５を直接制御する。 (Embodiment 5)
In this Embodiment 5, as shown in FIG. 8, the monitoring mine 43 is made into the magnitude | size which a monitoring person cannot enter into a mine area. Moreover, as shown in FIG. 9, it has the connecting mine shaft 44 connected with the terminal of the monitoring mine 43 of the floor-plate structure 43, and the observer can enter. Further, a vertical shaft 46 is provided at one end of the connecting mine shaft 44 to allow the observer to enter and exit between the ground and the connecting mine shaft 44. The monitoring pit 43 is formed with a gradient that descends vertically downward toward the connecting mine shaft 44. Therefore, the drainage discharged to the monitoring mine 43 is collected on the connecting mine shaft 44 side. The drainage collected in the connecting mine shaft 44 is drained to the ground by a drainage device 47 provided at the lower end of the shaft 46. A movable monitoring device 45 that monitors at least the discharge state of drainage in the monitoring mine 43 is provided in the connecting mine shaft 44. The monitoring device 45 performs analysis measurement by monitoring the discharge state of drainage and / or sampling of drainage. Here, when performing remote monitoring, the monitoring device 45 is remotely controlled under the control of a monitoring control device (not shown) installed on the ground. Further, when the monitoring person directly performs monitoring, the monitoring device 45 is directly controlled under the operation of the monitoring person.

この実施の形態５では、監視坑４３の坑内領域に監視員が入ることができない大きさであるため、床板構造体２の厚さを減らすことができ、埋設処分施設全体の構成をコンパクトにすることができる。また、監視坑３の排水は、自然勾配によって連絡坑道４４に流れてくるため、監視坑３内あるいは監視坑３間に排水管を設ける必要がなくなる。   In this Embodiment 5, since it is the magnitude | size which a monitoring person cannot enter into the mine area | region of the monitoring mine 43, the thickness of the floor board structure 2 can be reduced, and the structure of the whole buried disposal facility is made compact. be able to. Moreover, since the drainage of the monitoring mine 3 flows into the connecting mine shaft 44 by a natural gradient, it is not necessary to provide a drain pipe in the monitoring mine 3 or between the monitoring mine 3.

（実施の形態６）
この実施の形態６では、図１０に示すように、下部地盤１００と、床板構造体２との間に、止水材６を敷設している。なお、下部地盤１００の上部表面部を平滑にするための均しコンクリートを形成した後、この均しコンクリートと床板構造体２との間に止水材６を敷設するようにしてもよい。 (Embodiment 6)
In the sixth embodiment, as shown in FIG. 10, a water blocking material 6 is laid between the lower ground 100 and the floor board structure 2. In addition, after forming the leveling concrete for smoothing the upper surface part of the lower ground 100, you may make it lay the water stop material 6 between this leveling concrete and the floor board structure 2. FIG.

具体的な止水材６は、塩化ビニル製の止水シートで実現される。止水シートの下側に不織布などの排水材を設けることによって、地下水の底部からの浸透を一層抑制することができる。なお、止水シート以外にも、アスファルト材、吸水膨張性の止水材などを敷設してもよい。   The specific water stop material 6 is realized by a water stop sheet made of vinyl chloride. By providing a drainage material such as a nonwoven fabric on the lower side of the water stop sheet, it is possible to further suppress the permeation from the bottom of the groundwater. In addition to the water stop sheet, an asphalt material, a water-swellable water stop material, or the like may be laid.

この実施の形態６では、止水材６によって地下水の底部から床板構造体２への浸透を抑制することができ、監視坑３は、排水ゾーン１６からの排水のみを監視対象の水として監視すればよいので、監視作業の負荷を軽減することができるとともに、排水処理の負荷も軽減することができる。   In the sixth embodiment, the water blocking material 6 can suppress the permeation from the bottom of the groundwater into the floor plate structure 2, and the monitoring well 3 monitors only the drainage from the drainage zone 16 as the monitoring target water. Therefore, it is possible to reduce the monitoring work load and the wastewater treatment load.

なお、図１１に示すように、床板構造体２内に監視坑３を設けず、床板構造体２の側部に監視坑５３を設けるようにしてもよい。   As shown in FIG. 11, the monitoring pit 3 may be provided on the side portion of the floorboard structure 2 without providing the monitoring pit 3 in the floorboard structure 2.

なお、上述した実施の形態１〜６では、コンクリート躯体である施設躯体１２内に廃棄体１３の層として格納する埋設処分施設を例にあげて説明したが、これに限らず、例えば、図１２に示すように、施設躯体４１に囲まれる廃棄物格納空間Ｅ内に放射性廃棄物を直接格納できる複数の独立した大型で移動可能な格納容器３１にも適用することができる。図１２では、実施の形態４に対応し、施設本体１に替えて複数の格納容器３１を設け、格納容器３１と下部地盤１００との間に床板構造体２を設けている。なお、施設躯体４１の外縁部には、施設躯体４１を覆うように排水ゾーン３６が形成されている。この排水ゾーン３６は、排水ゾーン１６と同様に、施設躯体４１の内縁部に形成してもよい。また、図１２では、排水ゾーン３６の外周を覆うように金属板が形成されている。   In the first to sixth embodiments described above, the buried disposal facility stored as a layer of the waste body 13 in the facility housing 12 that is a concrete housing has been described as an example. As shown in FIG. 6, the present invention can also be applied to a plurality of independent large and movable storage containers 31 that can directly store radioactive waste in the waste storage space E surrounded by the facility housing 41. In FIG. 12, corresponding to the fourth embodiment, a plurality of storage containers 31 are provided instead of the facility body 1, and the floor board structure 2 is provided between the storage container 31 and the lower ground 100. A drainage zone 36 is formed at the outer edge of the facility housing 41 so as to cover the facility housing 41. The drainage zone 36 may be formed at the inner edge of the facility housing 41 in the same manner as the drainage zone 16. In FIG. 12, a metal plate is formed so as to cover the outer periphery of the drainage zone 36.

また、上述した実施の形態の構成要素は、適宜組み合わせが可能である。   In addition, the components of the above-described embodiments can be appropriately combined.

１ 施設本体
２ 床板構造体
２ａ 底板
２ｂ 側壁
２ｃ 天板
３，４３，５３ 監視坑
４，５，４７ 排水装置
５ａ 貯留部
５ｂ 排水管
６ 止水材
１０ ＲＣ躯体
１１ ＰＣ板
１２，４１ 施設躯体
１３ 廃棄体
１４ ホワイトゾーン
１５ 充填モルタル廃棄体
１６，３６ 排水ゾーン
１６ａ 排出口
１７ 点検排水管
２１ 施設本体
２２ 排水孔
２３ 水みち
３１ 格納容器
３２ 調査兼止水剤注入管
３３ 止水剤注入管
４４ 連絡坑道
４５ 監視装置
４６ 立坑
１００ 下部地盤
１０１ 埋設空間
１０２ ベントナイト混合土 DESCRIPTION OF SYMBOLS 1 Facility main body 2 Floor plate structure 2a Bottom plate 2b Side wall 2c Top plate 3,43,53 Monitoring well 4,5,47 Drainage device 5a Reservoir 5b Drain pipe 6 Water stop material 10 RC housing 11 PC board 12,41 Facility housing 13 Waste 14 White Zone 15 Filling Mortar Waste 16, 36 Drain Zone 16a Drain 17 Inspection Drain Pipe 21 Facility Body 22 Drain Hole 23 Water Path 31 Containment Container 32 Survey and Water Stopper Injection Pipe 33 Water Stop Agent Injection Pipe 44 Contact Tunnel 45 Monitoring device 46 Vertical shaft 100 Lower ground 101 Buried space 102 Bentonite mixed soil

Claims (8)

放射性廃棄物を地中に埋設処分する放射性廃棄物の埋設処分施設において、
放射性廃棄物入り容器を格納した施設躯体または格納容器の底部と下部地盤との間に床板構造体を設け、
前記施設躯体または前記格納容器は、前記施設躯体または前記格納容器の内周面もしくは外周面に沿って内部を囲み、下部に排出口を有する排水ゾーンが形成され、
前記排水ゾーンと前記排水ゾーンからの排水を監視する監視坑との間には前記排水ゾーンからの排水を前記監視坑に導く点検排水管が設けられ、
周囲の地盤から前記施設躯体もしくは前記格納容器に浸入してくる地下水または前記施設躯体もしくは前記格納容器から浸出してくる漏水を排水として前記排水ゾーンに導き、さらに前記点検排水管を介して前記監視坑に導いて前記排水の放射能汚染度を監視することを特徴とする放射性廃棄物の埋設処分施設。 In a radioactive waste burial facility that buryes radioactive waste underground,
A floor slab structure is provided between the bottom of the facility housing or the bottom ground of the container containing the radioactive waste container,
The facility housing or the containment vessel surrounds the inside along the inner peripheral surface or the outer peripheral surface of the facility housing or the containment vessel, and a drainage zone having a discharge port at a lower portion is formed.
Between the drainage zone and the monitoring mine that monitors the drainage from the drainage zone, an inspection drain pipe that guides the drainage from the drainage zone to the monitoring pit is provided,
Groundwater that infiltrates from the surrounding ground into the facility enclosure or the containment vessel or leakage water that leaches out from the facility enclosure or the containment vessel is led to the drainage zone as drainage, and is further monitored through the inspection drainage pipe. A radioactive waste burying and disposal facility characterized in that it is guided to a mine to monitor the radioactive contamination of the waste water. 前記監視坑は、前記床板構造体内に設けられることを特徴とする請求項１に記載の放射性廃棄物の埋設処分施設。   2. The radioactive waste embedding disposal facility according to claim 1, wherein the monitoring mine is provided in the floor board structure. 前記施設躯体または前記格納容器の底板は、前記床板構造体であることを特徴とする請求項１または２に記載の放射性廃棄物の埋設処分施設。   3. The radioactive waste embedding disposal facility according to claim 1, wherein the facility housing or the bottom plate of the containment vessel is the floor plate structure. 4. 前記床板構造体は、下部地盤から前記床板構造体を通過して前記施設躯体または前記格納容器に向かって流れる地下水を前記監視坑に集水することを特徴とする請求項１〜３のいずれか一つに記載の放射性廃棄物の埋設処分施設。   The said floor board structure collects groundwater which passes through the said floor board structure body from a lower ground and flows toward the said facility frame or the said storage container in the said monitoring mine. The radioactive waste embedding disposal facility as described in one. 前記監視坑は、坑内領域に監視員が入ることができない大きさであり、
前記監視坑の末端に設けられた連絡坑道内に移動可能な監視装置が設けられ、
前記監視装置は、前記排水の湧出状態の監視及び／または前記排水のサンプリングによる分析測定を行うことを特徴とする請求項１〜４のいずれか一つに記載の放射性廃棄物の埋設処分施設。 The monitoring mine is sized so that no observer can enter the mine area,
A movable monitoring device is provided in a connecting tunnel provided at the end of the monitoring mine,
5. The radioactive waste embedding disposal facility according to claim 1, wherein the monitoring device performs monitoring and measurement of the discharge state of the drainage and / or sampling and sampling of the drainage. 前記床板構造体は、底板、側壁、及び天板を有する箱型躯体であり、
前記監視坑の床面積は、前記床板構造体の底面積の１／２以上であることを特徴とする請求項１〜４のいずれか一つに記載の放射性廃棄物の埋設処分施設。 The floor plate structure is a box-shaped housing having a bottom plate, side walls, and a top plate,
5. The radioactive waste embedding disposal facility according to claim 1, wherein a floor area of the monitoring pit is ½ or more of a bottom area of the floorboard structure. 前記監視坑は、並行して複数配置され、
隣接する監視坑間をつなぎ前記監視坑に直交する方向に配置される複数の排水孔が設けられ、
下部地盤から前記床板構造体を通過して前記施設躯体または前記格納容器に向かって流れる地下水を前記排水孔に湧出させ、この排水孔に湧出した排水を前記監視坑に集水することを特徴とする請求項１〜４のいずれか一つに記載の放射性廃棄物の埋設処分施設。 A plurality of the monitoring wells are arranged in parallel,
A plurality of drain holes arranged in a direction perpendicular to the monitoring pit connecting between adjacent monitoring pits are provided,
The groundwater flowing from the lower ground through the floor structure to the facility housing or the containment vessel is discharged to the drainage hole, and the drainage discharged from the drainage hole is collected in the monitoring pit. The radioactive waste embedding disposal facility according to any one of claims 1 to 4. 下部地盤、下部地盤の上部表面部を平滑にするための均しコンクリート、または下部岩盤面と、前記床板構造体との間に、止水材が敷設されていることを特徴とする請求項１〜３，５，６のいずれか一つに記載の放射性廃棄物の埋設処分施設。   2. A waterstop material is laid between the lower ground, leveled concrete for smoothing the upper surface of the lower ground, or the lower rock surface and the floor board structure. The radioactive waste embedding disposal facility according to any one of -3, 5, and 6.
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