JPH0823598B2 - Radioactive substance removal device - Google Patents
Radioactive substance removal deviceInfo
- Publication number
- JPH0823598B2 JPH0823598B2 JP62281042A JP28104287A JPH0823598B2 JP H0823598 B2 JPH0823598 B2 JP H0823598B2 JP 62281042 A JP62281042 A JP 62281042A JP 28104287 A JP28104287 A JP 28104287A JP H0823598 B2 JPH0823598 B2 JP H0823598B2
- Authority
- JP
- Japan
- Prior art keywords
- adsorbent
- radioactive
- coolant
- oxygen
- hydrogen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- 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
Landscapes
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、液体金属を冷却材とする原子炉において、
冷却材中の不純物および放射性物質を析出・吸着して除
去するコールドトラップ型の放射性物質除去装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a reactor using liquid metal as a coolant,
The present invention relates to a cold trap type radioactive substance removing device that deposits and adsorbs impurities and radioactive substances in a coolant to remove them.
コールドトラップ型の放射性物質除去装置は、当該装
置内に導いた冷却材を低温に冷却して、冷却材中におけ
る不純物および放射性物質の濃度を過飽和の状態にし、
同装置内に具備した吸着材上に前記不純物および放射性
物質を析出・吸着することにより、冷却材中の不純物お
よび放射性物質を除去するというものである。The cold trap type radioactive substance removing device cools the coolant introduced into the device to a low temperature to make the concentration of impurities and radioactive substances in the coolant supersaturated,
The impurities and radioactive substances in the coolant are removed by depositing and adsorbing the impurities and radioactive substances on the adsorbent provided in the apparatus.
そして、冷却材中の不純物および放射性物質は、下記
の３つに大別することができる。The impurities and radioactive substances in the coolant can be roughly classified into the following three.
（１）酸素・水素等の不純物 （２）コバルト（Co），マンガン（Mn）等の放射性腐食
生成物 （３）セシウム（Cs）等の放射性核***生成物 第５図は従来提案に係るコールドトラップ型放射性物
質除去装置の全体構成を示す縦断面図で、第５図に示す
放射性物質除去装置は、ステンレス鋼メッシュ22を充填
した前段コールドトラップ33と、ニッケル鋼メッシュ23
を充填した後段コールドトラップ34とにより構成され、
前段トラップ33で酸素・水素等の不純物を除去し、さら
に後段トラップ34で放射性腐食生成物および放射性核分
裂生成物を除去するというものである。(1) Impurities such as oxygen and hydrogen (2) Radioactive corrosion products such as cobalt (Co) and manganese (Mn) (3) Radiofission products such as cesium (Cs) Fig. 5 is a cold trap according to the conventional proposal FIG. 5 is a vertical cross-sectional view showing the overall configuration of the type radioactive substance removing device. The radioactive substance removing device shown in FIG. 5 has a pre-stage cold trap 33 filled with a stainless steel mesh 22 and a nickel steel mesh 23.
It is composed of a post-stage cold trap 34 filled with
The former trap 33 removes impurities such as oxygen and hydrogen, and the latter trap 34 removes radioactive corrosion products and radioactive fission products.
なお、コールドトラップ型放射性物質除去装置に関す
る先行技術は、例えば特開昭54−37013号公報に記載さ
れている。The prior art relating to the cold trap type radioactive substance removing device is described in, for example, Japanese Patent Application Laid-Open No. 54-37013.
しかして、第５図に示す従来提案の放射性物質除去装
置によれば、後段コールドトラップ34に具備したニッケ
ル鋼メッシュ23による放射性腐食生成物の析出効果は良
好であるが、ニッケル鋼によって放射性核***生成物を
析出する効果はあまり期待することができず、特に、放
射性核***生成物中に、セシウムは、被ばくに対する影
響が大きいため、この核***生成物を効率よく除去する
ことは、メンテナンス時における作業者の被ばく線量を
少なくする上で極めて重要である。According to the conventionally proposed radioactive material removing device shown in FIG. 5, the nickel steel mesh 23 provided in the subsequent cold trap 34 has a good effect of precipitating radioactive corrosion products, but the nickel steel produces radioactive fission products. The effect of precipitating substances can not be expected so much, and especially in radioactive fission products, cesium has a large influence on the exposure, so it is important to remove this fission product efficiently during maintenance. It is extremely important to reduce the exposure dose of.
これに対し、特開昭59−188597号公報には、放射性腐
食生成物吸着材と放射性核***生成物吸着材とを別々に
設ける技術が開示されている。On the other hand, JP-A-59-188597 discloses a technique in which a radioactive corrosion product adsorbent and a radioactive fission product adsorbent are provided separately.
ところで、吸着材に対する不純物および放射性物質の
析出厚さには限度があり、装置の運転時間が経過するに
つれて、その除去効率が低下してくるが、吸着材の寿命
がきた場合に、当該着材の部分的交換を認識していない
第５図の従来型放射性物質除去装置にあっては、装置全
体の交換を必要とする。By the way, the deposition thickness of impurities and radioactive substances on the adsorbent is limited, and its removal efficiency decreases as the operating time of the device elapses. The conventional radioactive substance removal apparatus of FIG. 5 which does not recognize the partial replacement of the above requires replacement of the entire apparatus.
これに対して、実願昭47−135451号（実開昭49−8934
8号）のマイクロフィルムには、放射性物質吸着材を引
抜交換自在とした技術が開示されている。On the other hand, Japanese Utility Model Sho 47-135451 (Japanese Utility Model Sho 49-8934)
No. 8) microfilm discloses a technique in which a radioactive substance adsorbent can be drawn out and replaced.
しかしながら、前掲刊行物に記載された技術を含め
て、従来にあっては、放射性物質吸着材の部分的目詰ま
り防止につき認識されていない。However, the prevention of partial clogging of the radioactive substance adsorbent has not been recognized in the past, including the techniques described in the above publications.
つまり、放射性物質除去装置の吸着材充填部に一方向
から冷却材を流した場合、最初に冷却材と接触する側の
放射性物質吸着材がどうしても早めに目詰まりする傾向
を示し、このときの目詰まりを基準にして放射性物質吸
着材を交換するようにしているため、前記以外の放射性
物質吸着材がそれ程目詰まりしていなくても放射性物質
吸着材交換の時期に至るため、その交換サイクルが短
く、頻繁に放射性物質吸着材を交換しなければならない
煩わしさがある。In other words, when the coolant is flowed from one direction into the adsorbent filling part of the radioactive substance removal device, the radioactive substance adsorbent on the side that comes into contact with the coolant first tends to clog early, and Since the radioactive material adsorbent is replaced based on the clogging, the radioactive material adsorbent other than the above is not clogged so much, but the radioactive material adsorbent replacement time comes, so the replacement cycle is short. However, there is an annoyance that the radioactive material adsorbent must be replaced frequently.
本発明は、従来提案に係るコールドトラップ型放射性
物質除去装置を改良したものであって、本発明の第１の
目的は、酸素・水素等の不純物や放射性腐食生成物は勿
論のこと、被ばくに対する影響の大きなセシウムを含む
放射性核***生成物を効率よく捕獲することに加えて、
さらに従来に比べて放射性物質吸着材の交換サイクルを
長くし、従来のように頻繁に放射性物質吸着材を交換し
なければならない煩わしさを無くした放射性物質除去装
置を提供することにある。The present invention is an improvement of the cold trap type radioactive substance removing device according to the conventional proposal, and the first object of the present invention is not only to prevent impurities such as oxygen and hydrogen and radioactive corrosion products but also to exposure. In addition to efficiently capturing radioactive fission products containing high-impact cesium,
It is another object of the present invention to provide a radioactive substance removing device which has a longer exchange cycle of the radioactive substance adsorbent as compared with the conventional one, and which eliminates the trouble of frequently exchanging the radioactive substance adsorbent as in the conventional case.
また、本発明の第２の目的は、前記第１の目的に加え
て、放射性物質吸着材の寿命がきた場合に、吸着材のみ
を交換して、当該吸着材に対する不純物および放射性物
質の除去率を常に一定に確保でき、設備の有効利用化を
はかることのできる放射性物質除去装置を提供すること
にある。A second object of the present invention is, in addition to the first object, the removal rate of impurities and radioactive substances from the adsorbent by exchanging only the adsorbent when the lifetime of the adsorbent is reached. The object of the present invention is to provide a radioactive substance removal device that can always ensure a constant level and can effectively utilize the equipment.
そして、本発明の第１の目的は、冷却材が流入するハ
ウジングと、ハウジング内に流入した冷却材を冷却する
冷却部と、前記冷却部によって冷却された冷却材が流入
通過する放射性物質吸着材とを具備するコールドトラッ
プ型の放射性物質除去装置において、前記放射性物質吸
着材として、冷却材中の酸素・水素を析出する酸素・水
素吸着材と、冷却材中の放射性腐食生成物を吸着する放
射性腐食生成物吸着材と、冷却材中の放射性核***生成
物を吸着する放射性核***生成物吸着材とを備え、冷却
材は中空円筒状に配列した吸着材充填部の周囲から当該
吸着材充填部内に流入し、吸着材充填部中央の空洞部を
通過した後に機外に排出するよう構成することによって
達成される。A first object of the present invention is to provide a housing into which a coolant flows, a cooling unit that cools the coolant that flows into the housing, and a radioactive substance adsorbent through which the coolant cooled by the cooling unit flows in and out. In the cold trap type radioactive substance removing device comprising: an oxygen / hydrogen adsorbent that precipitates oxygen / hydrogen in a coolant and a radioactive substance that adsorbs a radioactive corrosion product in the coolant as the radioactive substance adsorbent. A corrosion product adsorbent and a radioactive fission product adsorbent that adsorbs the radioactive fission product in the coolant are provided, and the coolant is located in the adsorbent filling part from around the adsorbent filling part arranged in a hollow cylinder. This is achieved by configuring such that it flows in, passes through the hollow portion at the center of the adsorbent filling portion, and then is discharged to the outside of the machine.
また、本発明の第２の目的は、前記第１の構成に加え
て、さらに吸着材充填部の中央に位置する冷却材出口ノ
ズル部と、放射性物質吸着材を充填したハウジングの中
央に位置する冷却材出口配管とを着脱自在として、前記
放射性物質吸着材を引抜交換自在とすることによって達
成される。A second object of the present invention is, in addition to the first configuration, a coolant outlet nozzle portion located in the center of the adsorbent filling portion and a center portion of the housing filled with the radioactive material adsorbent material. This is achieved by making the coolant outlet pipe detachable and allowing the radioactive substance adsorbent to be drawn out and replaced.
しかし、本発明は、前記〔問題点を解決するための手
段〕の項前段に記載の構成を採用することにより、本発
明装置内に冷却材を導くと、酸素・水素等の不純物は、
例えばステンレス鋼メッシュに代表される酸素・水素吸
着材に析出・吸着され、また放射性腐食生成物は、例え
ばニッケル鋼メッシュに代表される放射性腐食生成物吸
着材に析出・吸着され、放射性核***生成物は、例えば
ガラス質カーボンメッシュに代表される放射性核***生
成物吸着材に析出・吸着される。However, the present invention adopts the configuration described in the preceding paragraph of [Means for Solving Problems] by introducing the coolant into the device of the present invention, and impurities such as oxygen and hydrogen are
For example, it is deposited / adsorbed on an oxygen / hydrogen adsorbent typified by a stainless steel mesh, and radioactive corrosion products are deposited / adsorbed on a radioactive corrosion product adsorbent typified by a nickel steel mesh. Is deposited and adsorbed on a radioactive fission product adsorbent represented by, for example, a glassy carbon mesh.
そして、本発明の最も大きな特徴として、冷却材は中
空円筒状に配列した吸着材充填部の周囲から当該吸着材
充填部内に流入し、吸着材充填部中央の空洞部を通過し
た後に機外に排出するよう構成したことにより、冷却材
中の不純物や放射性物質は、従来のように、冷却材と最
初に接触する側の放射性物質吸着材のみが早めに目詰ま
りするものではなく、冷却材は吸着材充填部全体の周囲
から当該吸着材充填部内に略均等に流入し、吸着材充填
部中央の空洞部からこれまた略均等に流出する。And, as the most significant feature of the present invention, the coolant flows into the adsorbent filling portion from around the adsorbent filling portion arranged in a hollow cylindrical shape, and after passing through the hollow portion at the center of the adsorbent filling portion, is outside the machine. Due to the structure to discharge, the impurities and radioactive substances in the coolant do not prematurely clog the radioactive substance adsorbent on the side that first comes into contact with the coolant as in the conventional case, and the coolant does not From around the entire adsorbent-filled portion, the adsorbent-filled portion is flown into the adsorbent-filled portion substantially evenly, and from the hollow portion at the center of the adsorbent-filled portion, also substantially uniformly outflowed.
また、本発明は、前記構成に加えて、さらに吸着材充
填部の中央に位置する冷却材出口ノズル部と、放射性物
質吸着材を充填したハウジングの中央に位置する冷却材
出口配管とを着脱自在として、前記放射性物質吸着材を
引抜交換自在とすることにより、放射性物質吸着材の寿
命がきた場合に、吸着材のみを交換して、当該吸着材に
対する不純物および放射性物質の除去率を常に一定に確
保でき、設備の有効利用化をはかることができる。Further, in addition to the above-described configuration, the present invention is capable of further detaching the coolant outlet nozzle portion located in the center of the adsorbent filling portion and the coolant outlet pipe located in the center of the housing filled with the radioactive material adsorbent material. As a result, by making the radioactive substance adsorbent removable and replaceable, when the lifetime of the radioactive substance adsorbent is reached, only the adsorbent is exchanged and the removal rate of impurities and radioactive substances relative to the adsorbent is always constant. It can be secured and effective utilization of equipment can be achieved.
以下、本発明を、第１図および第２図の一実施例にも
とづいて説明すると、第１図は本発明に係る放射性物質
除去装置の全体構成を示す縦断面図、第２図は第１図に
符号４で示す吸着材充填部の詳細を示す縦断面図であ
る。Hereinafter, the present invention will be described based on one embodiment of FIGS. 1 and 2. FIG. 1 is a vertical cross-sectional view showing the entire configuration of a radioactive substance removing apparatus according to the present invention, and FIG. It is a longitudinal cross-sectional view which shows the detail of the adsorbent filling part shown by the code | symbol 4 in the figure.
本発明装置の全体構成を示す第１図において、１は有
底円筒状のハウジングであり、このハウジング１の底部
には、冷却材入口配管２および冷却材出口配管３が接続
されている。冷却材入口配管２および冷却材出口配管３
には、それぞれ弁17,18とドレン管15,16とが設置されて
いる。ハウジング１の上端開口部には、円板フランジ状
のキャスク取付座11が設置されており、キャスク取付座
11には、円板状の蓋部８が、固定部材12より、着脱自在
に固定されている。蓋部８には、下方に延びる複数本の
ねじ部材９が固定されており、ねじ部材９には、後述の
ごとく、非均質な物質で構成される吸着材充填部４が取
り付けられている。吸着材充填部４の最下端部には、下
部仕切板５が設置されており、また吸着材充填部４の最
上端部には、上部仕切板５が設置されている。さらに、
前記下部仕切板５の外端部には、円筒状の断熱層板６が
固定されており、断熱層板６とハウジング１との間に
は、本発明装置に流入した冷却材を低温に冷却するため
の冷却ガス配管10が、ハウジング１の円周方向に複数本
設置されている。放射性物質吸着材４を充填したハウジ
ング１の中央に位置する冷却材出口配管３の開先部と、
吸着材充填部４の中央に位置して下部仕切板７に固定さ
れた冷却材出口ノズル部13の開先部とは、互いに凹凸形
状をしており、その接続部14部分において、着脱自在に
密着接続されている。In FIG. 1 showing the overall configuration of the device of the present invention, reference numeral 1 is a bottomed cylindrical housing, and a coolant inlet pipe 2 and a coolant outlet pipe 3 are connected to the bottom of the housing 1. Coolant inlet pipe 2 and coolant outlet pipe 3
Valves 17 and 18 and drain pipes 15 and 16 are installed therein, respectively. A disc flange-shaped cask mounting seat 11 is installed in the upper opening of the housing 1, and
A disc-shaped lid portion 8 is detachably fixed to the fixing member 12 by the fixing member 12. A plurality of screw members 9 extending downward are fixed to the lid portion 8, and the adsorbent filling portion 4 made of a non-homogeneous substance is attached to the screw members 9 as described later. A lower partition plate 5 is installed at the lowermost end of the adsorbent filling unit 4, and an upper partition plate 5 is installed at the uppermost end of the adsorbent filling unit 4. further,
A cylindrical heat insulating layer plate 6 is fixed to the outer end portion of the lower partition plate 5, and the coolant flowing into the device of the present invention is cooled to a low temperature between the heat insulating layer plate 6 and the housing 1. A plurality of cooling gas pipes 10 are installed in the circumferential direction of the housing 1. A groove portion of the coolant outlet pipe 3 located at the center of the housing 1 filled with the radioactive material adsorbent 4,
The groove portion of the coolant outlet nozzle portion 13 located at the center of the adsorbent filling portion 4 and fixed to the lower partition plate 7 has concave and convex shapes, and the connecting portion 14 portion thereof is detachable. Closely connected.
しかして、前記吸着材充填部４は、第２図に示すよう
に、その外周部より順に、ステンレス鋼メッシュ22,ニ
ッケル鋼メッシュ23,ガラス質カーボンメッシュ24が配
置されており、さらに吸着材充填部４の上・下方向は、
複数の仕切板21によって分離されている。As shown in FIG. 2, the adsorbent filling section 4 has a stainless steel mesh 22, a nickel steel mesh 23, and a vitreous carbon mesh 24 arranged in this order from the outer periphery of the adsorbent filling section 4. Up and down direction of part 4,
It is separated by a plurality of partition plates 21.
そして、本発明の最も大きな特徴として、冷却材は中
空円筒状に配列した吸着材充填部４の周囲から当該吸着
材充填部４内に流入し、吸着材充填部４の中央に形成さ
れた空洞部35を通過した後にハウジング１外に排出する
よう構成されている。As the most significant feature of the present invention, the coolant flows into the adsorbent filling section 4 from the periphery of the adsorbent filling section 4 arranged in a hollow cylindrical shape, and a cavity formed in the center of the adsorbent filling section 4 After passing through the portion 35, it is configured to be discharged to the outside of the housing 1.
以上の構成において、冷却材入口配管２よりハウジン
グ１内に流入した冷却材は、下部仕切板5,断熱層板6,上
部仕切板７および仕切板21によって形成された流路を進
行する。ハウジング１内に流入した冷却材は、まず、下
部仕切板５の下方から断熱層板６の外側を上昇し、その
際、冷却ガス配管10により、冷却材中の不純物および放
射性物質の濃度が過飽和の状態になるまで冷却される。In the above configuration, the coolant that has flowed into the housing 1 through the coolant inlet pipe 2 advances through the flow path formed by the lower partition plate 5, the heat insulation layer plate 6, the upper partition plate 7, and the partition plate 21. The coolant that has flowed into the housing 1 first rises from below the lower partition plate 5 to the outside of the heat insulation layer plate 6, and at that time, the concentration of impurities and radioactive substances in the coolant is supersaturated by the cooling gas pipe 10. It is cooled to the state of.
次いで、冷却材は、断熱層板６と吸着材充填部４との
間を下降し、吸着材充填部４を外周部から中心部に向か
って通過する際、まず、スレンレス鋼メッシュ22上に、
冷却材中の酸素・水素等の不純物が析出・吸着され、ま
たニッケル鋼メッシュ23上に、冷却材中の放射性腐食生
成物が析出・吸着され、さらにガラス質カーボンメッシ
ュ24上に、冷却材中の放射性核***生成物が析出・吸着
される。Then, the coolant descends between the heat insulating layer plate 6 and the adsorbent filling section 4, and when passing through the adsorbent filling section 4 from the outer peripheral portion toward the central portion, first, on the stainless steel mesh 22,
Impurities such as oxygen and hydrogen in the coolant are deposited / adsorbed, radioactive corrosion products in the coolant are deposited / adsorbed on the nickel steel mesh 23, and further, on the glassy carbon mesh 24, the coolant is contained. The radioactive fission products of are deposited and adsorbed.
そして、吸着材充填部４を通過して浄化された冷却材
は、吸着材充填部４の出口ノズル部13を介し、ハウジン
グ１の冷却材出口配管３から機外に流出する。Then, the coolant purified by passing through the adsorbent filling section 4 flows out of the machine from the coolant outlet pipe 3 of the housing 1 through the outlet nozzle section 13 of the adsorbent filling section 4.
なお、本発明装置の運転期間が経過して、吸着材充填
部４内の各メッシュ22,23,24が目詰まりを起こした場合
には、冷却材入口配管２および冷却材出口配管３に設置
されている弁17,18を閉じ、ハウジング１内に対する冷
却材の流れを止める。次いで、ドレン管15,16に設置さ
れている弁19,20を開放して、ハウジング１内の冷却材
を、図示を省略したタンクにドレンする。そして、ハウ
ジング１内における冷却材のドレンが完了した時点で、
弁19,20を閉じるものであって、これで弁17,18,19,20の
全てを閉じたことになる。また、これと同時に、ハウジ
ング１上部のキャスク取付座11にキャスク25を取り付
け、この中に不活性ガスを充填して、空気とハウジング
１内における構造物との接触を遮断する。次に、蓋部８
を、図示を省略したクレーンによって、ハウジング１か
らキャスク25内に引き上げる。その結果、ねじ部材９を
介して蓋部８と連結されている吸着材充填部４は、下部
仕切板5,断熱層板６等とともに、キャスク25内に収納さ
れる。なお、その際、吸着材充填部４に析出した不純物
や放射性物質は、蓋部８引上時の振動により下方に落下
するが、これらの不純物や放射性物質は、吸着材充填部
４の下方に設置された下部仕切板５および断熱層板６に
よって全て捕獲され、ハウジング１の底部に堆積するこ
とはない。If the mesh 22, 23, 24 in the adsorbent filling section 4 is clogged after the operation period of the device of the present invention has passed, the mesh is installed in the coolant inlet pipe 2 and the coolant outlet pipe 3. The valves 17 and 18 which are connected to the housing 1 are closed to stop the flow of the coolant into the housing 1. Next, the valves 19 and 20 installed in the drain pipes 15 and 16 are opened, and the coolant in the housing 1 is drained to a tank (not shown). When the drain of the coolant in the housing 1 is completed,
The valves 19 and 20 are closed, and this means that all the valves 17, 18, 19 and 20 are closed. At the same time, a cask 25 is attached to the cask mounting seat 11 on the upper part of the housing 1, and an inert gas is filled in the cask 25 to shut off the contact between the air and the structure inside the housing 1. Next, the lid 8
Is pulled up from the housing 1 into the cask 25 by a crane (not shown). As a result, the adsorbent filling portion 4 connected to the lid portion 8 via the screw member 9 is housed in the cask 25 together with the lower partition plate 5, the heat insulating layer plate 6 and the like. At that time, the impurities and radioactive substances deposited in the adsorbent filling section 4 fall downward due to the vibration when the lid 8 is pulled up. However, these impurities and radioactive substances fall below the adsorbent filling section 4. All of them are captured by the installed lower partition plate 5 and the heat insulating layer plate 6 and do not deposit on the bottom of the housing 1.
そして、ハウジング１から取り出された吸着材充填部
4,下部仕切板5,断熱層板6,上部仕切板７および仕切板21
は、交換または洗浄再生後、前記と逆の手順でハウジン
グ１内に組み込まれる。Then, the adsorbent filling portion taken out from the housing 1
4, lower partition plate 5, heat insulation layer plate 6, upper partition plate 7 and partition plate 21
After replacement or cleaning regeneration, is incorporated in the housing 1 in the reverse order of the above.
本発明は以上のごとき構成よりなり、ここで、第１図
および第２図に示す実施例にもとづいて本発明の効果を
下記すると、冷却材中における酸素・水素等の不純物や
放射性腐食生成物は勿論のこと、被ばくに対する影響の
大きなセシウムを含む放射性核***生成物をも、単一の
装置によって同時に除去することができ（なお、セシウ
ムの除染係数は、ガラス質カーボンメッシュ直径約400m
m,高さ約400mmの容量で約100である）、放射性核***生
成物を除去する装置を新たに付設する必要がなく、放射
性物質除去装置のコンパクト化をはかることができる。
また、前記のごとく冷却材中に溶解する放射性核***生
成物、特に、被ばくに対する影響の大きなセシウムの除
去効率を大幅に向上させることができ、その結果とし
て、原子炉１次系統のメンテナンス時における作業者の
被ばく線量を低減することができる。しかも、前記実施
例において、吸着材充填部４は、冷却材の流れ方向に対
して非均質な各メッシュ22,23,24を設けることにより達
成でき、現行の原子炉に特別の設計変更をする必要はな
い。ところで、吸着材に対する不純物および放射性物質
の析出厚さには限度があり、装置の運転時間が経過する
につれて、その除去効率が低下してくるが、吸着材の寿
命がきた場合には、装置全体を交換することなく、吸着
材各メッシュ22,23,24のみを交換して、吸着材に対する
不純物および放射性物質の除去率を常に一定に確保で
き、設備の有効利用化をはかることができる。The present invention is configured as described above. Here, the effects of the present invention will be described below based on the embodiment shown in FIGS. 1 and 2. Impurities such as oxygen and hydrogen in the coolant and radioactive corrosion products will be described below. Of course, radioactive fission products containing cesium, which have a large effect on exposure, can be simultaneously removed by a single device (the decontamination coefficient for cesium is about 400 m in diameter of vitreous carbon mesh).
m, height is about 400 mm and capacity is about 100), and there is no need to additionally install a device for removing radioactive fission products, and the radioactive substance removal device can be made compact.
Further, as described above, it is possible to significantly improve the efficiency of removing radioactive fission products dissolved in the coolant, particularly cesium, which has a large effect on exposure, and as a result, work during maintenance of the primary reactor system. It is possible to reduce the exposure dose to persons. Moreover, in the above-described embodiment, the adsorbent filling section 4 can be achieved by providing the meshes 22, 23, 24 which are non-homogeneous with respect to the flow direction of the coolant, and a special design change is made to the existing nuclear reactor. No need. By the way, the deposition thickness of impurities and radioactive substances on the adsorbent is limited, and the removal efficiency decreases as the operating time of the device elapses. By exchanging only the adsorbent meshes 22, 23, 24 without exchanging the adsorbent, the removal rate of impurities and radioactive substances with respect to the adsorbent can be always kept constant, and the equipment can be effectively used.
そして、本発明の最も大きな特徴として、冷却材は中
空円筒状に配列した吸着材充填部４の周囲から当該吸着
材充填部４内に流入し、吸着材充填部４の中央に形成さ
れた空洞部35を通過した後にハウジング１外に排出する
よう構成したことにより、冷却材中の不純物や放射性物
質は、従来のように、冷却材と最初に接触する側の放射
性物質吸着材のみが早めに目詰まりするものではなく、
冷却材は吸着材充填部４全体の周囲から当該吸着材充填
部４内に略均等に流入し、吸着材充填部４中央の空洞部
35からこれまた略均等に流出するものであって、従来に
比べて放射性物質吸着材の交換サイクルを長くし、従来
のように頻繁に放射性物質吸着材を交換しなければなら
ない煩わしさを無くすことができる。As the most significant feature of the present invention, the coolant flows into the adsorbent filling section 4 from the periphery of the adsorbent filling section 4 arranged in a hollow cylindrical shape, and a cavity formed in the center of the adsorbent filling section 4 Since it is configured to be discharged to the outside of the housing 1 after passing through the portion 35, impurities and radioactive substances in the coolant can be expedited only by the radioactive substance adsorbent on the side that first comes into contact with the coolant as in the conventional case. Not something that clogs,
The coolant flows into the adsorbent filling section 4 from the entire periphery of the adsorbent filling section 4 substantially evenly, and a hollow portion at the center of the adsorbent filling section 4
This is also an almost uniform outflow from 35, which makes the exchange cycle of the radioactive material adsorbent longer than before and eliminates the hassle of having to frequently replace the radioactive material adsorbent as in the past. You can
第３図は本発明の第２の実施例を示す吸着材充填部４
の縦断面図である。FIG. 3 shows an adsorbent filling section 4 showing a second embodiment of the present invention.
FIG.
すなわち、第１図および第２図の実施例においては、
スレンレス鋼メッシュ22,ニッケル鋼メッシュ23,ガラス
質カーボンメッシュ24からなる吸着材充填部４を一体型
とした場合について例示したが、スレンレス鋼メッシュ
22とニッケル鋼メッシュ23とガラス質カーボンメッシュ
24のうち、最も内層に位置して元々目詰まりし難いガラ
ス質カーボンメッシュ24を、他のスレンレス鋼メッシュ
22,ニッケル鋼メッシュ23から分離して、第３図に示す
ように吸着材充填部４の冷却材出口ノズル部13内に配置
するようにしてもよい。That is, in the embodiment of FIGS. 1 and 2,
The case where the adsorbent filling section 4 composed of the stainless steel mesh 22, the nickel steel mesh 23, and the vitreous carbon mesh 24 is integrated is shown as an example.
22 and nickel steel mesh 23 and vitreous carbon mesh
Of the 24, the vitreous carbon mesh 24, which is located in the innermost layer and is not likely to be clogged originally, is replaced with another stainless steel mesh.
It may be separated from the nickel steel mesh 23 and placed in the coolant outlet nozzle portion 13 of the adsorbent filling portion 4 as shown in FIG.
第４図は本発明の第３の実施例を示す装置全体の縦断
面図である。FIG. 4 is a vertical sectional view of the entire apparatus showing a third embodiment of the present invention.
すなわち、第１図および第２図の実施例においては、
吸着材充填部４の交換に際し、キャスク25を用いて、当
該吸着材充填部４を引き抜く場合について例示したが、
キャスク25を用いない場合であっても、吸着材充填部４
の交換は可能である。これを、第４図にもとづいて説明
すると、同図において、ハウジング１の底蓋26は、固定
部材12により、ハウジング１の底部に設けられている底
蓋取付座27に対し、着脱自在に取り付けられている。冷
却材入口配管２と冷却材出口配管３とは、両配管2,3と
接続する１次系統配管28,29に対し、円板状の配管連結
座30を介して着脱自在に固定されている。配管連結座30
の前後には、それぞれ弁17,18,31,32が設置されてい
る。吸着材充填部４は、ハウジング１の上部から、ねじ
部材９によって吊り下げられている。なお、この吸着材
充填部４は、第１図および第２図に示す第１の実施例、
さらには第３図に示す第２の実施例と同様、各メッシュ
22,23,24によって構成されている。That is, in the embodiment of FIGS. 1 and 2,
An example of pulling out the adsorbent filling section 4 by using the cask 25 when replacing the adsorbent filling section 4 has been described.
Even if the cask 25 is not used, the adsorbent filling section 4
Can be exchanged. This will be described with reference to FIG. 4. In FIG. 4, the bottom lid 26 of the housing 1 is detachably attached to the bottom lid mounting seat 27 provided at the bottom of the housing 1 by the fixing member 12. Has been. The coolant inlet pipe 2 and the coolant outlet pipe 3 are detachably fixed to the primary system pipes 28 and 29 connected to both pipes 2 and 3 via a disc-shaped pipe connecting seat 30. . Pipe connection seat 30
Valves 17, 18, 31, and 32 are installed before and after respectively. The adsorbent filling section 4 is suspended from the upper part of the housing 1 by a screw member 9. The adsorbent filling section 4 is the same as the first embodiment shown in FIG. 1 and FIG.
Furthermore, each mesh is similar to the second embodiment shown in FIG.
It is composed of 22,23,24.
また、放射性物質吸着材４を充填したハウジング１の
中央に位置する冷却材出口配管３と、吸着材充填部４の
中央に位置して上部仕切板７に固定された冷却材出口ノ
ズル部13との接合部14は、前記第１の実施例と同様、着
脱自在に接続されている。さらに、ハウジング１の下部
には、ドレン管15が設置されている。Also, a coolant outlet pipe 3 located in the center of the housing 1 filled with the radioactive material adsorbent 4, and a coolant outlet nozzle portion 13 fixed to the upper partition plate 7 located in the center of the adsorbent filling portion 4. The joint portion 14 is detachably connected as in the first embodiment. Further, a drain pipe 15 is installed at the bottom of the housing 1.
以上の構成において、吸着材充填部４の各メッシュが
目詰まりを起こした場合には、まず、１次系統配管28,2
9に設置されている弁31,32を閉じ、ハウジング１内に対
する冷却材の流入を止める。次いで、ドレン管15に設置
されている弁19を開放して、ハウジング１内の冷却材
を、図示を省略したタンクにドレンする。そして、冷却
材入口配管２および冷却材出口配管３に設置されている
弁17,18を閉じて、冷却材入口配管２および冷却材出口
配管３を、１次系統配管28,29より分離し、図示を省略
したクレーンにより、装置全体をメンテナンスエリアに
搬出する。メンテナンスエリアにおいては、底蓋26を取
り外し、吸着材充填部４の交換または洗浄再生後、前記
と逆の手順で、冷却材入口配管２および冷却材出口配管
３を、１次系統配管28,29に接続する。In the above configuration, when each mesh of the adsorbent filling section 4 is clogged, first, the primary system pipes 28, 2
The valves 31 and 32 installed at 9 are closed to stop the flow of the coolant into the housing 1. Next, the valve 19 installed in the drain pipe 15 is opened, and the coolant in the housing 1 is drained to a tank (not shown). Then, the valves 17 and 18 installed in the coolant inlet pipe 2 and the coolant outlet pipe 3 are closed to separate the coolant inlet pipe 2 and the coolant outlet pipe 3 from the primary system pipes 28 and 29, The whole device is carried out to the maintenance area by a crane (not shown). In the maintenance area, the bottom cover 26 is removed, and the adsorbent filling section 4 is replaced or washed and regenerated, and then the coolant inlet pipe 2 and the coolant outlet pipe 3 are connected to the primary system pipes 28, 29 in the reverse order of the above procedure. Connect to.
以上本発明によれば、酸素・水素等の不純物や放射性
腐食生成物は勿論のこと、被ばくに対する影響の大きな
セシウムを含む放射性核***生成物を効率よく捕獲する
ことに加えて、本発明の最も大きな特徴として、冷却材
は中空円筒状に配列した吸着材充填部の周囲から当該吸
着材充填部に流入し、吸着材充填部の中央に形成された
空洞部を通過した後に機外に排出するように構成したこ
とにより、冷却材中の不純物や放射性物質は、従来のよ
うに、冷却材と最初に接触する側の放射性物質吸着材の
みが早めに目詰まりするものではなく、冷却材は吸着材
充填部全体の周囲から当該吸着材充填部内に略均等に流
入し、吸着材充填部中央の空洞部からこれまた略均等に
流出するものであって、従来に比べて放射性物質吸着材
の交換サイクルを長くし、従来のように頻繁に放射性物
質吸着材を交換しなければならない煩わしさを無くし
た、改良された放射性物質除去装置を得ることができ
る。As described above, according to the present invention, in addition to efficiently capturing radioactive fission products containing cesium, which have a large influence on exposure to radiation, as well as impurities such as oxygen and hydrogen and radioactive corrosion products, the largest of the present invention Characteristically, the coolant flows into the adsorbent filling part from the periphery of the adsorbent filling part arranged in a hollow cylinder, passes through the cavity formed in the center of the adsorbent filling part, and then is discharged to the outside of the machine. With this configuration, impurities and radioactive substances in the coolant do not clog the radioactive substance adsorbent on the side that first contacts the coolant earlier than in the conventional case, and the coolant does not absorb the adsorbent. It is a cycle in which a radioactive substance adsorbent is exchanged in a substantially uniform manner from around the entire filling part into the adsorbent filling part, and also from the hollow part in the center of the adsorbent filling part, and almost equally outflows. The long And, eliminating the inconvenience that must replace the conventional manner frequently radioactive material adsorbent, it is possible to obtain an improved radioactive substance remover.
また、本発明によれば、前記効果に加えて、放射性物
質吸着材の寿命がきた場合に、吸着材のみを交換して、
当該吸着材に対する不純物および放射性物質の除去率を
常に一定に確保でき、設備の有効利用化をはかることの
できる放射性物質除去装置を得ることができる。Further, according to the present invention, in addition to the above effects, when the life of the radioactive substance adsorbent is reached, only the adsorbent is replaced,
It is possible to obtain a radioactive substance removal device that can always ensure a constant removal rate of impurities and radioactive substances with respect to the adsorbent, and can effectively utilize the equipment.
第１図および第２図は本発明に係る放射性物質除去装置
の一実施例を示し、第１図はその全体構成を示す縦断面
図、第２図は第１図に符号４で示す吸着材充填部の詳細
を示す縦断面図、第３図は本発明の第２の実施例を示す
吸着材充填部４の縦断面図、第４図は本発明の第３の実
施例を示す装置全体の縦断面図、第５図は従来型放射性
物質除去装置の全体構成を示す縦断面図である。 １……ハウジング、３……冷却材出口配管、４……吸着
材充填部、８……蓋部、９……ねじ部材、10……冷却ガ
ス配管、11……キャスク取付座、12……固定部材、13…
…冷却材出口ノズル部、14……接続部、25……キャス
ク、35……空洞部。1 and 2 show an embodiment of the radioactive substance removing apparatus according to the present invention. FIG. 1 is a longitudinal sectional view showing the entire structure, and FIG. 2 is an adsorbent indicated by reference numeral 4 in FIG. FIG. 3 is a vertical sectional view showing details of a filling section, FIG. 3 is a vertical sectional view of an adsorbent filling section 4 showing a second embodiment of the present invention, and FIG. 4 is an entire apparatus showing a third embodiment of the present invention. FIG. 5 is a vertical cross-sectional view showing the overall structure of a conventional radioactive substance removal device. 1 ... Housing, 3 ... Coolant outlet pipe, 4 ... Adsorbent filling part, 8 ... Lid part, 9 ... Screw member, 10 ... Cooling gas pipe, 11 ... Cask mounting seat, 12 ... Fixing member, 13 ...
… Coolant outlet nozzle part, 14 …… connection part, 25 …… cask, 35 …… cavity part.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｇ２１Ｆ 9/06 ＺＡＢ ５７１ Ｅ (72)発明者 半田 博之 茨城県日立市幸町３丁目２番１号 日立エ ンジニアリング株式会社内 (72)発明者 田山 隆一 茨城県日立市幸町３丁目２番１号 日立エ ンジニアリング株式会社内 (56)参考文献 特開 昭54−37013（ＪＰ，Ａ) 特開 昭59−188597（ＪＰ，Ａ) 実開 昭49−89348（ＪＰ，Ｕ)─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display location G21F 9/06 ZAB 571 E (72) Inventor Hiroyuki Handa 3-2-1, Hitachi-cho, Ibaraki Prefecture Issued within Hitachi Engineering Co., Ltd. (72) Inventor Ryuichi Tayama 3-2-1, Sachimachi, Hitachi City, Ibaraki Prefecture Engaged within Hitachi Engineering Co., Ltd. (56) Reference JP-A-54-37013 (JP, A) JP-A-59-188597 (JP, A) Actually developed JP-A-49-89348 (JP, U)
Claims (6)
グ内に流入した冷却材を冷却する冷却部と、前記冷却部
によって冷却された冷却材が流入通過する放射性物質吸
着材とを具備するコールドトラップ型の放射性物質除去
装置において、 前記放射性物質吸着材として、冷却材中の酸素・水素を
析出する酸素・水素吸着材と、冷却材中の放射性腐食生
成物を吸着する放射性腐食生成物吸着材と、冷却材中の
放射性核***生成物を吸着する放射性核***生成物吸着
材とを備え、冷却材は中空円筒状に配列した吸着材充填
部の周囲から当該吸着材充填部内に流入し、吸着材充填
部中央の空洞部を通過した後に機外に排出するよう構成
したことを特徴とする放射性物質除去装置。1. A cold trap comprising: a housing into which a coolant flows; a cooling unit that cools the coolant that flows into the housing; and a radioactive substance adsorbent that allows the coolant cooled by the cooling unit to flow in and pass through. In a type of radioactive substance removal device, as the radioactive substance adsorbent, an oxygen / hydrogen adsorbent that precipitates oxygen / hydrogen in the coolant, and a radioactive corrosion product adsorbent that adsorbs the radioactive corrosion product in the coolant , A radioactive fission product adsorbent that adsorbs the radioactive fission product in the coolant, and the coolant flows into the adsorbent filling part from the periphery of the adsorbent filling part arranged in a hollow cylindrical shape, and the adsorbent filling A radioactive substance removing device characterized in that it is configured to be discharged to the outside of the machine after passing through a hollow part in the center of the part.
素吸着材と放射性腐食生成物吸着材と放射性核***生成
物吸着材とを３層の一体化物とした放射性物質除去装
置。2. The radioactive substance removing device according to claim 1, wherein the oxygen / hydrogen adsorbent, the radioactive corrosion product adsorbent and the radioactive fission product adsorbent are integrated into three layers.
素吸着材と放射性腐食生成物吸着材と放射性核***生成
物吸着材のうち、放射性核***生成物吸着材を、他の酸
素・水素吸着材，放射性腐食生成物吸着材から分離し
て、吸着材充填部の冷却材出口ノズル部内に配置した放
射性物質除去装置。3. The method according to claim 1, wherein among the oxygen / hydrogen adsorbent, the radioactive corrosion product adsorbent and the radioactive fission product adsorbent, the radioactive fission product adsorbent is replaced with another oxygen / hydrogen adsorbent. Material, radioactive corrosion product adsorbent, radioactive material removal device that is placed in the coolant outlet nozzle part of the adsorbent filling part.
グ内に流入した冷却材を冷却する冷却部と、前記冷却部
によって冷却された冷却材が流入通過する放射性物質吸
着材とを具備するコールドトラップ型の放射性物質除去
装置において、 前記放射性物質吸着材として、冷却材中の酸素・水素を
析出する酸素・水素吸着材と、冷却材中の放射性腐食生
成物を吸着する放射性腐食生成物吸着材と、冷却材中の
放射性核***生成物を吸着する放射性核***生成物吸着
材とを備え、冷却材は中空円筒状に配列した吸着材充填
部の周囲から当該吸着材充填部内に流入し、吸着材充填
部中央の空洞部を通過した後に機外に排出するよう構成
し、かつ前記吸着材充填部の中央に位置する冷却材出口
ノズル部と、 放射性物質吸着材を充填したハウジングの中央に位置す
る冷却材出口配管とを着脱自在として、前記放射性物質
吸着材を引抜交換自在とした構造の放射性物質除去装
置。4. A cold trap comprising: a housing into which a coolant flows; a cooling unit that cools the coolant that flows into the housing; and a radioactive substance adsorbent through which the coolant cooled by the cooling unit flows. In a type of radioactive substance removal device, as the radioactive substance adsorbent, an oxygen / hydrogen adsorbent that precipitates oxygen / hydrogen in the coolant, and a radioactive corrosion product adsorbent that adsorbs the radioactive corrosion product in the coolant , A radioactive fission product adsorbent that adsorbs the radioactive fission product in the coolant, and the coolant flows into the adsorbent filling part from the periphery of the adsorbent filling part arranged in a hollow cylindrical shape, and the adsorbent filling Of the cooling medium outlet nozzle portion located at the center of the adsorbent filling portion and configured to be discharged to the outside of the machine after passing through the hollow portion in the center of the housing, and the housing filled with the radioactive material adsorbent material. As detachable and coolant outlet pipe located in central radioactive substance removing device structure freely drawing replacing the radioactive material adsorbent.
素吸着材と放射性腐食生成物吸着材と放射性核***生成
物吸着材とを３層の一体化物とした放射性物質除去装
置。5. The radioactive substance removing device according to claim 4, wherein the oxygen / hydrogen adsorbent, the radioactive corrosion product adsorbent and the radioactive fission product adsorbent are integrated into three layers.
素吸着材と放射性腐食生成物吸着材と放射性核***生成
物吸着材のうち、放射性核***生成物吸着材を、他の酸
素・水素吸着材，放射性腐食生成物吸着材から分離し
て、吸着材充填部の冷却材出口ノズル部内に配置した放
射性物質除去装置。6. The method according to claim 4, wherein among the oxygen / hydrogen adsorbent, the radioactive corrosion product adsorbent and the radioactive fission product adsorbent, the radioactive fission product adsorbent is used as another oxygen / hydrogen adsorbent. Material, radioactive corrosion product adsorbent, radioactive material removal device that is placed in the coolant outlet nozzle part of the adsorbent filling part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62281042A JPH0823598B2 (en) | 1987-11-09 | 1987-11-09 | Radioactive substance removal device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62281042A JPH0823598B2 (en) | 1987-11-09 | 1987-11-09 | Radioactive substance removal device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01123198A JPH01123198A (en) | 1989-05-16 |
| JPH0823598B2 true JPH0823598B2 (en) | 1996-03-06 |
Family
ID=17633487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62281042A Expired - Lifetime JPH0823598B2 (en) | 1987-11-09 | 1987-11-09 | Radioactive substance removal device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0823598B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10237535A (en) * | 1997-02-28 | 1998-09-08 | Nippon Steel Corp | Vacuum refining furnace |
| CA3008889A1 (en) | 2016-03-08 | 2017-10-05 | Terrapower, Llc | Fission product getter |
| CN207038182U (en) * | 2017-03-29 | 2018-02-23 | 泰拉能源有限责任公司 | Caesium collector |
| EP4018014A1 (en) | 2019-08-23 | 2022-06-29 | TerraPower, LLC | Sodium vaporizer and method for use of sodium vaporizer |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5234353Y2 (en) * | 1972-11-27 | 1977-08-05 | ||
| JPS5437013A (en) * | 1977-08-29 | 1979-03-19 | Toshiba Corp | Cold trap |
| JPS59188597A (en) * | 1983-04-11 | 1984-10-25 | 株式会社日立製作所 | Device for removing liquid metal impurity |
-
1987
- 1987-11-09 JP JP62281042A patent/JPH0823598B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01123198A (en) | 1989-05-16 |
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