JP7062568B2 - Water treatment method and water treatment preparation method for nuclear power plants - Google Patents

Water treatment method and water treatment preparation method for nuclear power plants Download PDF

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JP7062568B2
JP7062568B2 JP2018181329A JP2018181329A JP7062568B2 JP 7062568 B2 JP7062568 B2 JP 7062568B2 JP 2018181329 A JP2018181329 A JP 2018181329A JP 2018181329 A JP2018181329 A JP 2018181329A JP 7062568 B2 JP7062568 B2 JP 7062568B2
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water
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建城 中村
孝夫 高田
恵美子 廣瀬
恵太 高倉
祐介 洞山
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Toshiba Energy Systems and Solutions Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

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Description

本発明の実施形態は、原子力発電所の停止期間に、原子力発電所内に保有された保有水を浄化処理する原子力発電所の水処理方法、及びこの水処理方法を実施するために準備する原子力発電所の水処理準備方法に関する。 An embodiment of the present invention is a water treatment method for a nuclear power plant that purifies and treats the possessed water held in the nuclear power plant during the shutdown period of the nuclear power plant, and a nuclear power generation prepared for implementing the water treatment method. Regarding the method of preparing for water treatment at the power plant.

発電業務を停止している原子力発電所内には、核燃料の冷却等を目的として大量の水が保有されている。例えば、原子炉ウェル、サプレッションチェンバ、使用済燃料貯蔵プール及び復水浄化系設備に大量の水が貯溜され保有されている。原子力発電所の停止期間中には稼働時と比べて水の浄化処理が滞っており、これらの水は稼働時に比べると、より多くのクラッド等の不純物を含んでいる。しかも、この不純物は放射性物質を含有している。 A large amount of water is held in a nuclear power plant where power generation operations are suspended for the purpose of cooling nuclear fuel. For example, a large amount of water is stored and held in a reactor well, a suppression chamber, a spent fuel storage pool, and a condensate purification system facility. During the shutdown period of the nuclear power plant, the purification treatment of water is delayed compared to the operation, and these waters contain more impurities such as clads than the operation. Moreover, this impurity contains radioactive substances.

原子力発電所の停止状態から廃止措置へ移行する場合には、上記水を保有する設備の解体のために、解体前に解体対象設備内の水を移送し、更に、放射性物質を含む不純物除去のためにこの水を浄化処理する必要がある。また、停止中の原子力発電所を再稼働させる場合においても、プラントの安定運転、及び運転中の作業員の被ばく量低減のために、原子力発電所内の水の浄化処理を同様に行う必要がある。以下、停止中に原子力施設内に保有され滞溜している水を、保有水と呼称する。また、原子力発電所が停止中とは、発電業務を行っていないときのことであり、核燃料の冷却用や点検のために、燃料プール冷却浄化系等の一部の機器を稼働させていることがある。 When shifting from the shutdown state of a nuclear power plant to decommissioning, in order to dismantle the equipment that holds the above water, the water in the equipment to be dismantled is transferred before dismantling, and impurities including radioactive substances are removed. Therefore, it is necessary to purify this water. In addition, even when restarting a nuclear power plant that has been shut down, it is necessary to purify the water inside the nuclear power plant in the same way in order to ensure stable operation of the plant and reduce the exposure of workers during operation. .. Hereinafter, the water held and accumulated in the nuclear facility during the shutdown is referred to as the held water. In addition, the nuclear power plant is out of service when it is not engaged in power generation work, and some equipment such as the fuel pool cooling and purification system is in operation for cooling and inspection of nuclear fuel. There is.

特開２０１４－５２２５１号公報Japanese Unexamined Patent Publication No. 2014-52251

これまで、原子力発電所内で使用され廃棄されることとなった水は、既設の廃棄物処理設備を用いて浄化処理されてきた。 Until now, water that has been used and discarded in nuclear power plants has been purified using existing waste treatment equipment.

原子力発電所の廃止措置や、長期間停止中にあった原子力発電所の再稼働準備においても、大量の保有水はこれまでと同様に、既設の廃棄物処理設備を用いて処理することになる。こうした原子力発電所において浄化処理が必要な保有水は大量であるが、廃棄物処理設備で浄化処理できる単位時間当たりの処理容量は、保有水量に対して比較的小さい。
従って、こうした原子力発電所の原子炉ウェル、サプレッションチェンバ、使用済燃料貯蔵プール及び復水浄化系設備に保有された大量の保有水を、既設の廃棄物処理設備の処理容量に合わせて廃棄物処理設備に移送して浄化処理を行っていては、保有水の浄化処理が終わるまで、数か月かかることがあり、また、既設の廃棄物処理設備への負担が大きい。更にその間、原子炉ウェルやサプレッションチェンバ等の上記設備の解体や再稼働に向けた作業に着手できず、原子力発電所の廃止措置や再稼働準備のための工事期間が長期化する可能性がある。 Even in the decommissioning of nuclear power plants and preparations for restarting nuclear power plants that have been out of service for a long period of time, a large amount of water possessed will be treated using existing waste treatment equipment as before. .. Although the amount of water held in such nuclear power plants that requires purification treatment is large, the treatment capacity per unit time that can be purified by waste treatment equipment is relatively small compared to the amount of water held.
Therefore, a large amount of water held in the reactor wells, suppression chambers, spent fuel storage pools and condensate purification system facilities of these nuclear power plants is treated as waste according to the treatment capacity of the existing waste treatment facilities. If the water is transferred to the equipment for purification treatment, it may take several months until the purification treatment of the retained water is completed, and the burden on the existing waste treatment equipment is large. Furthermore, during that time, work for dismantling and restarting the above equipment such as reactor wells and suppression chambers could not be started, and the construction period for decommissioning nuclear power plants and preparing for restart may be prolonged. ..

本発明の実施形態は、上述の事情を考慮してなされたものであり、停止中の原子力発電所における保有水の浄化処理を効率的に実施できる原子力発電所の水処理方法及び水処理準備方法を提供することを目的とする。 The embodiment of the present invention has been made in consideration of the above-mentioned circumstances, and is a water treatment method and a water treatment preparation method for a nuclear power plant that can efficiently carry out purification treatment of retained water in a stopped nuclear power plant. The purpose is to provide.

本発明の実施形態における原子力発電所の水処理方法は、原子力発電所の停止期間に前記原子力発電所内の保有水を処理する原子力発電所の水処理方法であって、前記原子力発電所における原子炉ウェル、燃料貯蔵プール、サプレッションチェンバ及び復水貯蔵設備のうち少なくとも１つに保有された保有水を、タービン建屋内の主復水器へ移送する第１移送工程と、前記主復水器に移送された保有水を、前記タービン建屋内の復水浄化系設備にて浄化する浄化工程と、前記浄化工程にて浄化された保有水を前記タービン建屋外へ移送する第２移送工程と、を有し、前記第１移送工程では、前記原子炉ウェルに保有された保有水を、前記復水貯蔵設備を経て前記主復水器へ移送することを特徴とするものである。 The water treatment method of a nuclear power plant according to the embodiment of the present invention is a water treatment method of a nuclear power plant that treats the water possessed in the nuclear power plant during the shutdown period of the nuclear power plant, and is a nuclear reactor in the nuclear power plant. The first transfer step of transferring the retained water held in at least one of the well, the fuel storage pool, the suppression chamber, and the condensate storage facility to the main dewatering unit in the reactor building, and the transfer to the main dewatering unit. It has a purification step of purifying the retained water in the condensate purification system facility inside the reactor building and a second transfer step of transferring the retained water purified in the purification step to the outside of the reactor building. The first transfer step is characterized in that the retained water held in the reactor well is transferred to the main water recovery device via the recovery water storage facility .

本発明の実施形態における原子力発電所の水処理準備方法は、原子力発電所の停止期間に、前記原子力発電所内のサプレッションチェンバに保有された保有水を主復水器へ移送し復水浄化系設備により浄化処理する工程の前に、前記サプレッションチェンバを前記主復水器に接続することを特徴とするものである。 The method for preparing water treatment for a nuclear power plant according to the embodiment of the present invention is a condensate purification system facility in which the retained water held in the suppression chamber in the nuclear power plant is transferred to the main condenser during the shutdown period of the nuclear power plant. It is characterized in that the suppression chamber is connected to the main condenser before the step of purifying the water.

本発明の実施形態によれば、停止中の原子力発電所における保有水の浄化処理を効率的に実施できる。 According to the embodiment of the present invention, it is possible to efficiently carry out the purification treatment of the possessed water in the stopped nuclear power plant.

一実施形態に係る原子力発電所の水処理方法が適用される停止中の原子力発電所に保有された保有水の貯溜状況を示す原子力発電所の縦断面図。(I) A vertical sectional view of a nuclear power plant showing the state of storage of water held in a suspended nuclear power plant to which the water treatment method of the nuclear power plant according to the embodiment is applied. 図１の保有水の処理系統を説明する系統図。The system diagram explaining the treatment system of the possession water of FIG. 復水浄化系設備と給水系設備を説明する系統図。A system diagram explaining the condensate purification system equipment and the water supply system equipment.

以下、本発明を実施するための形態を、図面に基づき説明する。
図１は、一実施形態に係る原子力発電所の水処理方法が適用される、停止中の原子力発電所に保有された保有水の貯溜状況を示す原子力発電所の縦断面図である。この図１に示す原子力発電所１０は、原子炉建屋１１、タービン建屋１２、復水貯蔵設備１３及び廃棄物処理設備１４を有して構成され、原子炉建屋１１内に、炉心（不図示）を備えた原子炉圧力容器１５を収容する原子炉格納容器１６が配置されている。なお、復水貯蔵設備１３及び廃棄物処理設備１４はいずれも、原子炉建屋１１及びタービン建屋１２の外側に設けられた施設である。 Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a vertical sectional view of a nuclear power plant showing the state of storage of retained water held in a stopped nuclear power plant to which the water treatment method of the nuclear power plant according to the embodiment is applied. The nuclear power plant 10 shown in FIG. 1 includes a reactor building 11, a turbine building 12, a condensate storage facility 13, and a waste treatment facility 14, and has a core (not shown) in the reactor building 11. A reactor storage vessel 16 for accommodating a reactor pressure vessel 15 is arranged. The condensate storage facility 13 and the waste treatment facility 14 are both facilities provided outside the reactor building 11 and the turbine building 12.

原子炉建屋１１には、原子炉格納容器１６のほかに、原子炉ウェル１７、使用済燃料貯蔵プール１８、サプレッションチェンバ１９等が設けられている。原子炉格納容器１６は、原子炉圧力容器１５を収容することで、一次格納施設として事故時の放射能の漏洩を防止する。原子炉ウェル１７は、原子炉圧力容器１５上部の空間であり、燃料取出し等の水中作業の際は、この空間を満水にする。使用済燃料貯蔵プール１８は、使用済燃料を冷却水により冷却しつつ貯蔵する。サプレッションチェンバ１９は、事故時に炉心を冷却するための冷却水を貯溜する。原子炉建屋１１は、鉄筋コンクリート構造物であり、事故時に放射性物質の漏洩を防止する二次格納施設としての機能も果たす。 In addition to the reactor containment vessel 16, the reactor building 11 is provided with a reactor well 17, a spent fuel storage pool 18, a suppression chamber 19, and the like. By accommodating the reactor pressure vessel 15, the reactor containment vessel 16 prevents the leakage of radioactivity in the event of an accident as a primary containment facility. The reactor well 17 is a space above the reactor pressure vessel 15, and this space is filled with water during underwater work such as fuel removal. The spent fuel storage pool 18 stores the spent fuel while cooling it with cooling water. The suppression chamber 19 stores cooling water for cooling the core in the event of an accident. The reactor building 11 is a reinforced concrete structure and also functions as a secondary storage facility for preventing leakage of radioactive materials in the event of an accident.

タービン建屋１２は、タービン２１及び発電機（不図示）を内部に配置すると共に、タービン２１の直下に主復水器２２を配置する。更に、タービン建屋１２には、主復水器２２を含む復水浄化系設備２３(図２)が設けられている。タービン建屋１２は、原子炉建屋１１と同様に鉄筋コンクリート構造物であり、事故時に放射性物質の漏洩を防止する機能を果たす。 In the turbine building 12, the turbine 21 and the generator (not shown) are arranged inside, and the main condenser 22 is arranged directly under the turbine 21. Further, the turbine building 12 is provided with a condensate purification system facility 23 (FIG. 2) including a main condenser 22. The turbine building 12 is a reinforced concrete structure similar to the reactor building 11, and functions to prevent leakage of radioactive materials in the event of an accident.

復水浄化系設備２３は、図２に示すように、復水再循環ライン２４に主復水器２２、復水ポンプ２５、ろ過装置２６、脱塩装置２７、循環ポンプ２８及び主復水器２２が順次配置されて構成される。タービン２１で仕事をした蒸気が主復水器２２により凝縮されて復水となり、復水浄化系設備２３はこの復水を浄化する。つまり、復水ポンプ２５及び循環ポンプ２８の運転により主復水器２２内の復水が復水再循環ライン２４を循環して流れる間に、復水中のクラッドや不要なイオン成分等などの不純物がろ過装置２６及び脱塩装置２７により除去される。尚、復水ポンプ２５の容量が十分に大きな場合には循環ポンプ２８を省略してもよい。 As shown in FIG. 2, the condensate purification system equipment 23 has a main condensate 22, a condensate pump 25, a filtration device 26, a desalination device 27, a circulation pump 28, and a main condensate in the condensate recirculation line 24. 22 are sequentially arranged and configured. The steam that worked in the turbine 21 is condensed by the main condenser 22 to be condensate, and the condensate purification system equipment 23 purifies the condensate. That is, while the condensate in the main condenser 22 circulates and flows through the condensate recirculation line 24 due to the operation of the condensate pump 25 and the circulation pump 28, impurities such as clads in the condensate and unnecessary ionic components are used. Is removed by the filtration device 26 and the condenser 27. If the capacity of the condensate pump 25 is sufficiently large, the circulation pump 28 may be omitted.

また、復水浄化系設備２３における復水再循環ライン２４には、脱塩装置２７の下流で且つ循環ポンプ２８の上流側に、排水弁３０を備えた排水配管２９が接続されている。この排水配管２９は、後に詳説する廃棄物処理設備１４に接続され、または海など環境に開放される。 Further, a drainage pipe 29 provided with a drainage valve 30 is connected to the condensate recirculation line 24 in the condensate purification system equipment 23 downstream of the desalination device 27 and upstream of the circulation pump 28. The drainage pipe 29 is connected to the waste treatment facility 14 described in detail later, or is opened to the environment such as the sea.

復水貯蔵設備１３は、原子炉建屋１１外及びタービン建屋１２外に設置されると共に、第１接続配管３１を用いてタービン建屋１２内の主復水器２２に接続される。更に、復水貯蔵設備１３は、第２接続配管３２を用いて原子炉建屋１１内の原子炉ウェル１７に接続され、第３接続配管３３を用いて原子炉建屋１１内の使用済燃料貯蔵プール１８に接続されている。通常運転時において、この復水貯蔵設備１３は、復水浄化系設備２３にて浄化された復水を、第１接続配管３１を介して一旦貯蔵した後に必要な箇所、例えば第１接続配管３１を経て主復水器２２へ、第２接続配管３２を経て原子炉ウェル１７へ、第３接続配管３３を経て使用済燃料貯蔵プール１８へ給水する。 The condensate storage facility 13 is installed outside the reactor building 11 and outside the turbine building 12, and is connected to the main condenser 22 inside the turbine building 12 by using the first connection pipe 31. Further, the condensate storage facility 13 is connected to the reactor well 17 in the reactor building 11 by using the second connection pipe 32, and the spent fuel storage pool in the reactor building 11 is connected by using the third connection pipe 33. It is connected to 18. During normal operation, the condensate storage facility 13 temporarily stores the condensate purified by the condensate purification system facility 23 via the first connection pipe 31, and then stores it at a required location, for example, the first connection pipe 31. Water is supplied to the main condenser 22 via the second connecting pipe 32, to the reactor well 17 via the second connecting pipe 32, and to the spent fuel storage pool 18 via the third connecting pipe 33.

図１に示す廃棄物処理設備１４は、原子炉建屋１１やタービン建屋１２で発生する液体または固体の廃棄物を処理する設備であり、原子炉建屋１１外及びタービン建屋１２外に設置される。この廃棄物処理設備１４にて処理された水などの液体は、海などの環境へ放出される。廃棄物処理設備１４は、原子力発電所１０の通常運転時においても稼働している。この原子力発電所１０の通常運転時に廃棄物処理設備１４で処理すべき水量は、原子力発電所１０内に保有され滞溜している保有水が少量であるため、この保有水は、単位時間当たりの処理容量が小さな廃棄物処理設備１４を用いて十分に浄化処理される。 The waste treatment facility 14 shown in FIG. 1 is a facility for treating liquid or solid waste generated in the reactor building 11 and the turbine building 12, and is installed outside the reactor building 11 and outside the turbine building 12. The liquid such as water treated by the waste treatment facility 14 is released to the environment such as the sea. The waste treatment facility 14 is also in operation during normal operation of the nuclear power plant 10. The amount of water to be treated by the waste treatment facility 14 during normal operation of the nuclear power plant 10 is a small amount of the retained water held in the nuclear power plant 10 and accumulated, so that the retained water is per unit time. The waste treatment facility 14 having a small treatment capacity is used for sufficient purification treatment.

一方、例えば数か月から数年の比較的長期間の停止期間を経た原子力発電所１０や、廃止措置前の原子力発電所１０には、原子炉建屋１１内の原子炉ウェル１７、使用済燃料貯蔵プール１８及びサプレッションチェンバ１９、タービン建屋１２内の主復水器２２を含む復水浄化系設備２３、並びに原子炉建屋１１外及びタービン建屋１２外の復水貯蔵設備１３に大量の保有水Ｗが存在する。原子力発電所１０の規模にもよるが、原子炉発電所１０内の保有水Ｗは例えば９０００トンと想定され、その内訳は原子炉ウェル１７に２０００トン、使用済燃料貯蔵プール１８に２０００トン、サプレッションチェンバ１９に２０００トン、復水浄化系設備２３に１０００トン、復水貯蔵設備１３に２０００トンである。原子力発電所１０の廃止措置や再稼働準備においては、これらの工事期間を短縮するために、上述の大量の保有水Ｗを効率的に浄化処理する必要がある。 On the other hand, for example, in the nuclear power plant 10 that has been shut down for a relatively long period of several months to several years, or in the nuclear power plant 10 before the decommissioning, the reactor well 17 in the reactor building 11 and the spent fuel are used. A large amount of water W Exists. Although it depends on the scale of the nuclear power plant 10, the water holding W in the reactor power plant 10 is assumed to be 9000 tons, for example, and the breakdown is 2000 tons in the reactor well 17 and 2000 tons in the spent fuel storage pool 18. The suppression chamber 19 has 2000 tons, the condensate purification system equipment 23 has 1000 tons, and the condensate storage equipment 13 has 2000 tons. In the decommissioning of the nuclear power plant 10 and the preparation for restarting, it is necessary to efficiently purify the above-mentioned large amount of retained water W in order to shorten the construction period.

仮に、この大量の保有水Ｗを既設の廃棄物処理設備１４で浄化処理すると、廃棄物処理設備１４の単位時間当たりの処理容量が通常約１０～２０トンであるため、保有水Ｗの浄化処理に長時間を要する。従って、この保有水Ｗの浄化処理の後に解体作業や再稼働に向けた作業を行なうことになるため、原子力発電所１０の廃止措置や再稼働準備の工事期間が長期化する場合がある。また、保有水Ｗの不純物含有量によっては、廃棄物処理設備１４に大きな負荷がかかることで、頻繁なメンテナンスが必要になり、保有水Ｗの浄化処理がさらに長期になることがある。 If this large amount of retained water W is purified by the existing waste treatment facility 14, the treatment capacity of the waste treatment facility 14 per unit time is usually about 10 to 20 tons, so that the retained water W is purified. It takes a long time. Therefore, since the dismantling work and the work for restarting are performed after the purification treatment of the retained water W, the construction period for decommissioning the nuclear power plant 10 and preparing for restarting may be prolonged. Further, depending on the impurity content of the retained water W, a large load is applied to the waste treatment facility 14, which requires frequent maintenance, and the purification treatment of the retained water W may take a longer period of time.

本実施形態における原子力発電所の水処理方法は、単位時間当たりの処理容量が約１０００トンの復水浄化系設備２３を用いることで、停止期間における原子力発電所１０内の大量の保有水Ｗを短時間に大量に浄化処理するものであり、第１移送工程、浄化工程及び第２移送工程を有する。また、第１移送工程の前に、原子力発電所の水処理準備方法として接続工程を有する。 In the water treatment method of the nuclear power plant in the present embodiment, a large amount of water W held in the nuclear power plant 10 during the outage period is used by using the condensate purification system facility 23 having a treatment capacity of about 1000 tons per unit time. It purifies a large amount in a short time, and has a first transfer step, a purification step, and a second transfer step. Further, before the first transfer step, there is a connection step as a water treatment preparation method for the nuclear power plant.

接続工程は、図２に示すように、原子炉建屋１１内のサプレッションチェンバ１９をタービン建屋１２内の主復水器２２に、第４接続配管３４を用いて接続する工程である。この接続工程は、後述の如く、第１移送工程でサプレッションチェンバ１９内に保有された保有水Ｗを主復水器２２へ移送し、この移送された保有水Ｗを浄化工程で復水浄化系設備２３により浄化する前に実施される。 As shown in FIG. 2, the connection step is a step of connecting the suppression chamber 19 in the reactor building 11 to the main condenser 22 in the turbine building 12 by using the fourth connection pipe 34. In this connection step, as described later, the retained water W held in the suppression chamber 19 in the first transfer step is transferred to the main condenser 22, and the transferred retained water W is transferred to the condensate purification system in the purification step. It is carried out before purification by the equipment 23.

第１移送工程は、原子力発電所１０の停止期間に、原子炉ウェル１７、使用済燃料貯蔵プール１８、サプレッションチェンバ１９及び復水貯蔵設備１３のうち少なくとも１つに保有された保有水Ｗを、主復水器２２へ移送する工程である。本実施形態では、第１移送工程において、原子炉ウェル１７、使用済燃料貯蔵プール１８、サプレッションチェンバ１９及び復水貯蔵設備１３に保有された保有水Ｗを、タービン建屋１２内の主復水器２２へ移送する。 In the first transfer step, the retained water W held in at least one of the reactor well 17, the spent fuel storage pool 18, the suppression chamber 19, and the condensate storage facility 13 during the shutdown period of the nuclear power plant 10 is stored. This is the process of transferring to the main condenser 22. In the present embodiment, in the first transfer step, the retained water W held in the reactor well 17, the spent fuel storage pool 18, the suppression chamber 19, and the condensate storage facility 13 is used as the main condenser in the turbine building 12. Transfer to 22.

即ち、この第１移送工程では、原子炉ウェル１７に保有された保有水Ｗを既設の第２接続配管３２を用いて復水貯蔵設備１３へ移送し、使用済燃料貯蔵プール１８に保有された保有水Ｗを既設の第３接続配管３３を用いて復水貯蔵設備１３へ移送し、復水貯蔵設備１３内の保有水Ｗ及び復水貯蔵設備１３に移送されてきた保有水Ｗを、既設の第１接続配管３１を用いて主復水器２２へ移送する。また、この第１移送工程では、サプレッションチェンバ１９に保有された保有水Ｗを、前述の接続工程で新設された第４接続配管３４を用いて主復水器２２へ直接移送する。 That is, in this first transfer step, the retained water W held in the reactor well 17 was transferred to the condensate storage facility 13 using the existing second connecting pipe 32 and held in the spent fuel storage pool 18. The retained water W is transferred to the condensate storage facility 13 using the existing third connection pipe 33, and the retained water W in the condensate storage facility 13 and the retained water W transferred to the condensate storage facility 13 are already installed. Transfer to the main condenser 22 using the first connection pipe 31 of the above. Further, in this first transfer step, the retained water W held in the suppression chamber 19 is directly transferred to the main condenser 22 by using the fourth connection pipe 34 newly installed in the above-mentioned connection step.

浄化工程は、第１移送工程にて主復水器２２に移送された保有水Ｗを、タービン建屋１２内の復水浄化系設備２３にて浄化する工程である。つまり、主復水器２２に移送された保有水Ｗは、復水ポンプ２５及び循環ポンプ２８の運転により復水再循環ライン２４内を循環して流れる間に、この保有水Ｗ中のクラッドなどの不純物がろ過装置２６及び脱塩装置２７により除去されて浄化される。 The purification step is a step of purifying the retained water W transferred to the main condenser 22 in the first transfer step by the condensate purification system equipment 23 in the turbine building 12. That is, while the retained water W transferred to the main condenser 22 circulates in the condensate recirculation line 24 by the operation of the condensate pump 25 and the circulation pump 28, the clad in the retained water W and the like are formed. The impurities are removed and purified by the filtering device 26 and the desalting device 27.

第２移送工程は、浄化工程にて浄化された保有水Ｗを、排水配管２９を用いて、排水弁３０の開弁時にタービン建屋１２外へ移送する工程である。この第２移送工程における浄化された保有水Ｗの移送先は廃棄物処理設備１４である。保有水Ｗは、廃棄物処理設備１４で成分測定や線量測定され、必要に応じて浄化処理され、原子力発電所外の環境に放出されたり、容器等に収容されて保管されたりする。なお、保有水ｗは、浄化工程で十分に浄化できている場合には、廃棄物処理設備１４を経ずに、原子力発電所外の環境に放出されたり、容器等に収容されて保管されたりしてもよい。 The second transfer step is a step of transferring the retained water W purified in the purification step to the outside of the turbine building 12 when the drain valve 30 is opened by using the drain pipe 29. The transfer destination of the purified retained water W in this second transfer step is the waste treatment facility 14. The possessed water W is component-measured and dosimetrically measured by the waste treatment facility 14, purified as necessary, released to the environment outside the nuclear power plant, or stored in a container or the like. If the retained water w is sufficiently purified in the purification process, it may be released to the environment outside the nuclear power plant or stored in a container or the like without going through the waste treatment facility 14. You may.

以上のように構成されたことから、本実施形態によれば、次の効果（１）～（４）を奏する。
（１）停止中の原子力発電所１０における原子炉ウェル１７、使用済燃料貯蔵プール１８、サプレッションチェンバ１９及び復水貯蔵設備１３に保有された保有水Ｗを主復水器２２へ移送し、この主復水器２２に移送された大量の保有水Ｗを、単位時間当たりの処理容量が廃棄物処理設備１４よりも大きな復水浄化系設備２３によって短時間に浄化処理する。この結果、停止中の原子力発電所１０における保有水Ｗの浄化処理を効率的に実施できる。 Since it is configured as described above, according to the present embodiment, the following effects (1) to (4) are obtained.
(1) The retained water W held in the reactor well 17, the spent fuel storage pool 18, the suppression chamber 19, and the condensate storage facility 13 in the stopped nuclear power plant 10 is transferred to the main condenser 22. A large amount of retained water W transferred to the main condenser 22 is purified in a short time by the condensate purification system equipment 23 whose treatment capacity per unit time is larger than that of the waste treatment equipment 14. As a result, it is possible to efficiently carry out the purification treatment of the possessed water W at the stopped nuclear power plant 10.

（２）復水浄化系設備２３を用いた保有水Ｗの浄化工程後に、この保有水Ｗが排水配管２９を経て廃棄物処理設備１４へ移送された場合、保有水Ｗが復水浄化系設備２３により一旦浄化されているので、廃棄物処理設備１４の負荷を軽減できる。例えば、廃棄物処理設備１４においてフィルタの交換などのメンテナンスを低減できるので、廃棄物処理設備１４による保有水Ｗの浄化処理を短時間に効率的に実施できる。このため、解体作業や再稼働に向けた作業に迅速に着手することができるので、原子力発電所１０の廃止装置や再稼働準備の工事期間を短縮できる。 (2) When the retained water W is transferred to the waste treatment facility 14 via the drainage pipe 29 after the purification process of the retained water W using the condensate purification system equipment 23, the possessed water W becomes the condensate purification system equipment. Since it is once purified by 23, the load on the waste treatment facility 14 can be reduced. For example, since maintenance such as filter replacement can be reduced in the waste treatment facility 14, the purification treatment of the retained water W by the waste treatment facility 14 can be efficiently performed in a short time. Therefore, since the dismantling work and the work for restarting can be started quickly, the construction period for the abolition device of the nuclear power plant 10 and the preparation for restarting can be shortened.

（３）復水浄化系設備２３を用いた浄化工程により保有水Ｗ中の不純物が十分に除去されて浄化された保有水Ｗが、排水配管２９を経て環境へ放出される場合には、原子力発電所１０内の大量の保有水Ｗを短時間に無くすことができる。このため、解体作業や再稼働に向けた作業に迅速に着手することができるので、原子力発電所１０の廃止装置や再稼働準備の工事期間を短縮できる。 (3) When the retained water W purified by sufficiently removing impurities in the retained water W by the purification process using the condensate water purification system equipment 23 is discharged to the environment through the drainage pipe 29, nuclear power is used. It is possible to eliminate a large amount of retained water W in the power plant 10 in a short time. Therefore, since the dismantling work and the work for restarting can be started quickly, the construction period for the abolition device of the nuclear power plant 10 and the preparation for restarting can be shortened.

（４）原子力発電所１０を廃止措置する際に本実施形態の水処理方法を適用する場合には、浄化工程に用いられる復水浄化系設備２３は解体対象設備である。従って、原子力発電所１０内の保有水Ｗを浄化するために新たに処理設備を導入する必要がないので、原子力発電所１０内の保有水Ｗを合理的に処理することができる。 (4) When the water treatment method of the present embodiment is applied when the nuclear power plant 10 is decommissioned, the condensate water purification system equipment 23 used in the purification process is the equipment to be dismantled. Therefore, since it is not necessary to newly introduce a treatment facility for purifying the retained water W in the nuclear power plant 10, the retained water W in the nuclear power plant 10 can be rationally treated.

以上、本発明の実施形態を説明したが、この実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。この実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができ、また、それらの置き換えや変更は、発明の範囲や要旨に含まれると共に、特許請求の範囲に記載された発明とその均等の範囲に含まれる。 Although the embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. This embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention, and the replacements and changes thereof can be made. , It is included in the scope and gist of the invention, and is also included in the scope of the invention described in the claims and the equivalent scope thereof.

例えば、第１移送工程の前に、原子炉ウェル１７を第５接続配管３５により主復水器２２に接続する工程を設けてもよい。この場合、第１移送工程において、原子炉ウェル１７内の保有水Ｗは、復水貯蔵設備１３を経ずに、第５接続配管３５を通って主復水器２２に移送される。
また、第１移送工程の前に、使用済燃料貯蔵プール１８を第６接続配管３６により主復水器２２に接続する工程を設けてもよい。この場合、第１移送工程において、使用済燃料貯蔵プール１８内の保有水Ｗは、復水貯蔵設備１３を経ずに、第６接続配管３６を通って主復水器２２に移送される。 For example, before the first transfer step, a step of connecting the reactor well 17 to the main condenser 22 by the fifth connecting pipe 35 may be provided. In this case, in the first transfer step, the retained water W in the reactor well 17 is transferred to the main condenser 22 through the fifth connecting pipe 35 without passing through the condensate storage facility 13.
Further, before the first transfer step, a step of connecting the spent fuel storage pool 18 to the main condenser 22 by the sixth connecting pipe 36 may be provided. In this case, in the first transfer step, the retained water W in the spent fuel storage pool 18 is transferred to the main condenser 22 through the sixth connecting pipe 36 without passing through the condensate storage facility 13.

また、浄化工程において、保有水Ｗを復水浄化系設備２３で循環させ浄化させる際に、給水系設備４５を合わせて用いてもよい。図３は、復水浄化系設備２３と給水系設備４５を説明する系統図である。ここで用いる給水系設備４５は、給水加熱器４１、４３とポンプ４２と、これらを接続する給水再循環ライン４４とを備える。給水再循環ライン４４は、脱塩装置２７の下流で復水再循環ライン２４から分岐した配管であって、給水加熱器４１、ポンプ４２、給水加熱器４３を順に接続し、主復水器２２に接続する。また、給水加熱器４３の下流から一部分岐し、原子炉に繋がるラインがある。 Further, in the purification step, when the retained water W is circulated and purified by the condensate purification system equipment 23, the water supply system equipment 45 may be used together. FIG. 3 is a system diagram illustrating the condensate water purification system equipment 23 and the water supply system equipment 45. The feed water system equipment 45 used here includes feed water heaters 41 and 43, a pump 42, and a water supply recirculation line 44 connecting them. The feed water recirculation line 44 is a pipe branched from the condensate recirculation line 24 downstream of the desalination device 27, and the feed water heater 41, the pump 42, and the feed water heater 43 are connected in order, and the main condenser 22 is connected. Connect to. In addition, there is a line that partially branches from the downstream of the feed water heater 43 and connects to the reactor.

保有水Ｗを復水浄化系設備２３で循環させ浄化させる際に、給水系設備４５を合わせて用いることで、より多くの保有水Ｗを主復水器２２の後段側に保持することができる。そのため、原子炉ウェル１７、燃料貯蔵プール１８、サプレッションチェンバ１９及び復水貯蔵設備１３のうち少なくとも1つから、より多くの保有水を引き抜くことができ、原子炉ウェル１７、燃料貯蔵プール１８、サプレッションチェンバ１９及び復水貯蔵設備１３のうち少なくとも1つにおける、廃止措置や再稼働準備に係る作業をより早く開始することができる。 When the holding water W is circulated and purified by the condensate purification system equipment 23, by using the water supply system equipment 45 together, more holding water W can be held on the rear side of the main condenser 22. .. Therefore, more retained water can be withdrawn from at least one of the reactor well 17, fuel storage pool 18, suppression chamber 19, and condensate storage facility 13, and the reactor well 17, fuel storage pool 18, suppression. Work on decommissioning and restart preparation in at least one of the chamber 19 and the condensate storage facility 13 can be started earlier.

１０…原子力発電所、１１…原子炉建屋、１２…タービン建屋、１３…復水貯蔵設備、１４…廃棄物処理設備、１５…原子炉圧力容器、１６…原子炉格納容器、１７…原子炉ウェル、１８…使用済燃料貯蔵プール（燃料貯蔵プール）、１９…サプレッションチェンバ、２１…タービン、２２…主復水器、２３…復水浄化系設備、２４…復水再循環ライン、２５…復水ポンプ、２６…ろ過装置、２７…脱塩装置、２８…循環ポンプ、２９…排水配管、３０…排水弁、３１…第１接続配管、３２…第２接続配管、３３…第３接続配管、３４…第４接続配管、３５…第５接続配管、３６…第６接続配管、Ｗ…保有水、４１…給水加熱器、４２…ポンプ、４３…給水加熱器、４４…給水再循環ライン、４５…給水系設備 10 ... Nuclear power plant, 11 ... Reactor building, 12 ... Turbine building, 13 ... Condensate storage equipment, 14 ... Waste treatment equipment, 15 ... Reactor pressure vessel, 16 ... Reactor containment vessel, 17 ... Reactor well , 18 ... Spent fuel storage pool (fuel storage pool), 19 ... Suppression chamber, 21 ... Turbine, 22 ... Main water purifier, 23 ... Restoration purification system equipment, 24 ... Restoration recirculation line, 25 ... Restoration Pump, 26 ... Filtering device, 27 ... Desalting device, 28 ... Circulation pump, 29 ... Drainage pipe, 30 ... Drain valve, 31 ... First connection pipe, 32 ... Second connection pipe, 33 ... Third connection pipe, 34 ... 4th connection pipe, 35 ... 5th connection pipe, 36 ... 6th connection pipe, W ... Owned water, 41 ... Water supply heater, 42 ... Pump, 43 ... Water supply heater, 44 ... Water supply recirculation line, 45 ... Water supply system equipment

Claims (6)

原子力発電所の停止期間に前記原子力発電所内の保有水を処理する原子力発電所の水処理方法であって、
前記原子力発電所における原子炉ウェル、燃料貯蔵プール、サプレッションチェンバ及び復水貯蔵設備のうち少なくとも１つに保有された保有水を、タービン建屋内の主復水器へ移送する第１移送工程と、
前記主復水器に移送された保有水を、前記タービン建屋内の復水浄化系設備にて浄化する浄化工程と、
前記浄化工程にて浄化された保有水を前記タービン建屋外へ移送する第２移送工程と、を有し、
前記第１移送工程では、前記原子炉ウェルに保有された保有水を、前記復水貯蔵設備を経て前記主復水器へ移送することを特徴とする原子力発電所の水処理方法。 It is a water treatment method of a nuclear power plant that treats the water owned in the nuclear power plant during the shutdown period of the nuclear power plant.
The first transfer step of transferring the retained water held in at least one of the reactor well, the fuel storage pool, the suppression chamber and the condensate storage facility in the nuclear power plant to the main condenser in the turbine building.
A purification process that purifies the retained water transferred to the main condenser with the condensate purification system equipment inside the turbine building.
It has a second transfer step of transferring the retained water purified in the purification step to the outside of the turbine building.
The first transfer step is a water treatment method for a nuclear power plant, which comprises transferring the retained water held in the reactor well to the main condenser via the condensate storage facility . 原子力発電所の停止期間に前記原子力発電所内の保有水を処理する原子力発電所の水処理方法であって、
前記原子力発電所における原子炉ウェル、燃料貯蔵プール、サプレッションチェンバ及び復水貯蔵設備のうち少なくとも１つに保有された保有水を、タービン建屋内の主復水器へ移送する第１移送工程と、
前記主復水器に移送された保有水を、前記タービン建屋内の復水浄化系設備にて浄化する浄化工程と、
前記浄化工程にて浄化された保有水を前記タービン建屋外へ移送する第２移送工程と、を有し、
前記第１移送工程では、前記燃料貯蔵プールに保有された保有水を、前記復水貯蔵設備を経て前記主復水器へ移送することを特徴とする原子力発電所の水処理方法。 It is a water treatment method of a nuclear power plant that treats the water owned in the nuclear power plant during the shutdown period of the nuclear power plant.
The first transfer step of transferring the retained water held in at least one of the reactor well, the fuel storage pool, the suppression chamber and the condensate storage facility in the nuclear power plant to the main condenser in the turbine building.
A purification process that purifies the retained water transferred to the main condenser with the condensate purification system equipment inside the turbine building.
It has a second transfer step of transferring the retained water purified in the purification step to the outside of the turbine building.
The first transfer step is a water treatment method for a nuclear power plant, which comprises transferring the retained water held in the fuel storage pool to the main condenser via the condensate storage facility . 原子力発電所の停止期間に前記原子力発電所内の保有水を処理する原子力発電所の水処理方法であって、
前記原子力発電所における原子炉ウェル、燃料貯蔵プール、サプレッションチェンバ及び復水貯蔵設備のうち少なくとも１つに保有された保有水を、タービン建屋内の主復水器へ移送する第１移送工程と、
前記主復水器に移送された保有水を、前記タービン建屋内の復水浄化系設備にて浄化する浄化工程と、
前記浄化工程にて浄化された保有水を前記タービン建屋外へ移送する第２移送工程と、を有し、
前記第１移送工程では、前記サプレッションチェンバに保有された保有水を、前記復水貯蔵設備を経ずに前記主復水器へ移送することを特徴とする原子力発電所の水処理方法。 It is a water treatment method of a nuclear power plant that treats the water owned in the nuclear power plant during the shutdown period of the nuclear power plant.
The first transfer step of transferring the retained water held in at least one of the reactor well, the fuel storage pool, the suppression chamber and the condensate storage facility in the nuclear power plant to the main condenser in the turbine building.
A purification process that purifies the retained water transferred to the main condenser with the condensate purification system equipment inside the turbine building.
It has a second transfer step of transferring the retained water purified in the purification step to the outside of the turbine building.
The first transfer step is a water treatment method for a nuclear power plant, characterized in that the retained water held in the suppression chamber is transferred to the main condenser without passing through the condensate storage facility . 前記第２移送工程における浄化された保有水の移送先が、廃棄物処理設備または環境であることを特徴とする請求項１乃至３のいずれか１項に記載の原子力発電所の水処理方法。 The water treatment method for a nuclear power plant according to any one of claims 1 to 3 , wherein the destination of the purified retained water in the second transfer step is a waste treatment facility or an environment. 前記浄化工程では、前記復水浄化系設備と合わせて給水系設備の給水再循環ラインを用いることを特徴とする請求項１乃至４のいずれか１項に記載の原子力発電所の水処理方法。 The water treatment method for a nuclear power plant according to any one of claims 1 to 4 , wherein in the purification step, a water supply recirculation line of the water supply system equipment is used in combination with the water supply purification system equipment. 原子力発電所の停止期間に、前記原子力発電所内のサプレッションチェンバに保有された保有水を主復水器へ移送し復水浄化系設備により浄化処理する工程の前に、前記サプレッションチェンバを前記主復水器に接続することを特徴とする原子力発電所の水処理準備方法。 During the shutdown period of the nuclear power plant, the suppression chamber is restored to the main state before the process of transferring the retained water held in the suppression chamber in the nuclear power plant to the main condenser and purifying it by the condensate purification system equipment. A method for preparing water for a nuclear power plant, which is characterized by connecting to a condenser.
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