JPH0329897A - Method of removing radioactive substances from radioactive solid waste storage pool - Google Patents

Method of removing radioactive substances from radioactive solid waste storage pool

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Publication number
JPH0329897A
JPH0329897A JP16398889A JP16398889A JPH0329897A JP H0329897 A JPH0329897 A JP H0329897A JP 16398889 A JP16398889 A JP 16398889A JP 16398889 A JP16398889 A JP 16398889A JP H0329897 A JPH0329897 A JP H0329897A
Authority
JP
Japan
Prior art keywords
pool
water
pool water
radioactive
demineralizer
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.)
Pending
Application number
JP16398889A
Other languages
Japanese (ja)
Inventor
Masahiro Hamamoto
浜本 雅啓
Ryozo Yoshikawa
吉川 凉三
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP16398889A priority Critical patent/JPH0329897A/en
Publication of JPH0329897A publication Critical patent/JPH0329897A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To reduce the concentration of radioactivity in whole pool water and also to reduce an exposure in a vicinity of a pool by draining a part of the pool water, by passing through a purifing tank and by removing radioactive substances and then by returning the water to the pool. CONSTITUTION:Pool water 2 in a pool 1 overflows into an overflow tank 3 to maintain a constant pool water level. The water stores in the tank 3 flows through a closed loop to a filtration unit 5 at a constant flow rate, and therewith dusts and insoluble impurites are removed. This particular water flows into a demineralizer 6 and, after soluble radioactive substances are removed by an in exchange, is returned to the pool 1 to be mixed with the pool water 2. Purification of the pool water 2 is intended through this circulation process. Then, remaining lives of the filtration unit 5 and the demineralizer 6 are judged by a concentration meters of radioactivity 21 and 22, and a differential pressure guage 23. The filtration unit 5 and the demineralizer 6 which expire their lives, are isolated in the closed loop and then separated, lifted up and moved to a predetermined place to be stored, and after that, new apparatus are placed at the remained places.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は放射性固体廃棄物貯蔵プールの浄化方法に係り
、特に、イオン状に水中に溶解した放射性物質の除去に
優れ、作業員の被曝の低減に好適な放射性固体廃棄物貯
蔵プールの浄化方法に関する。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for purifying a radioactive solid waste storage pool, and is particularly effective in removing radioactive substances dissolved in water in ionic form, and reducing radiation exposure of workers. The present invention relates to a method for purifying a radioactive solid waste storage pool suitable for reduction.

〔従来の技術〕[Conventional technology]

原子力発電プラントの運転に伴って生じる使用済燃料,
使用済の制御棒,チャンネルボックス等の放射性固体廃
棄物は放射能レベルが高いこと等の理由から専用の放射
性固体廃棄物貯蔵プールの水中に貯蔵保管されている。
Spent fuel generated from the operation of nuclear power plants,
Radioactive solid waste such as used control rods and channel boxes is stored underwater in a dedicated radioactive solid waste storage pool due to its high radioactivity level.

放射性固体廃棄物悄蔵プールの水中における使用済燃料
,使用済の制御棒,チャンネルボックス等の貯蔵保管状
態を監視したり、専用のキャスク等に収納され貯蔵プー
ルに搬入されてくる使用済燃料,使用済の制御棒,チャ
ンネルボックス等を貯蔵プールの水面上より遠隔操作で
貯蔵プール内の所定の位置に設置する作業に対し、プー
ル水の透明度を確保するために、プール水の浄化が必要
であった。
We monitor the storage status of spent fuel, used control rods, channel boxes, etc. underwater in the radioactive solid waste storage pool, and monitor the storage status of spent fuel stored in special casks etc. and transported to the storage pool. Purification of the pool water is necessary to ensure the transparency of the pool water when installing used control rods, channel boxes, etc. into designated positions in the storage pool by remote control from above the water surface. there were.

従来の装置は、この様な要求に応えるため、特開昭56
−12835号公報に記載の様に、放射性固体廃棄物貯
蔵プールの水中に濾過器を設置し、プール水を循環濾過
することにより、プール水の透明度を低下せしむる要因
となる主として不溶解性の固形物を除去し前述の目的を
達成していた。また、濾過器を放射性固体廃棄物プール
のプール水中に設置することにより、濾過器上部のプー
ル水によりプール水面上への放射線を遮蔽すること,及
び、濾過器の浄化性能が低下し、新しい濾過器との交換
を必要とする状態に至った場合、放射能レベルの高い濾
過器を、原子力発電プラン1〜から取外すこと、および
、使用済固体廃棄物貯蔵プールから運び出すことなしに
、貯蔵プール水中で濾過器の交換交業を行なえることと
し、かつ、使用済の濾過器を貯蔵プール中の所定の位置
に移動し、そのまま貯蔵保管可能とすることにより、貯
蔵プールにおける作業者の被曝低減を図っている。
In order to meet such demands, conventional devices have
As described in Publication No. 12835, by installing a filter in the water of a radioactive solid waste storage pool and circulating filtration of the pool water, it is possible to remove The above objective was achieved by removing the solid matter. In addition, by installing a filter in the pool water of a radioactive solid waste pool, the pool water above the filter will shield radiation onto the pool water surface, and the purification performance of the filter will decrease, resulting in a new filter. If the condition reaches such a point that it is necessary to replace the filter with high radioactivity, the filter with high radioactivity should be removed from the nuclear power generation plan 1~ and removed from the spent solid waste storage pool. By making it possible for workers to exchange filters at the pool, and by moving used filters to a predetermined location in the storage pool and storing them as is, the radiation exposure of workers in the storage pool can be reduced. I'm trying.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上記従来技術は放射性固体廃棄物の貯蔵プール内での使
用済燃料,使用済の制御棒,チャンネルボックス等を当
該プールの水面上より遠隔操作で貯蔵プール内の所定の
位置に設置する作業等に対し、これを安全、かつ、確実
に実施可能とならしめるため、プール水を循環する系統
にメッシュ型フィルタを設置することにより、プール水
中の不純物を除去し、プール水の透明度を向上させるこ
とを主眼としていた。しかし、前述の使用済制御棒やチ
ャンネルボックスをプール水中で、例えば、角枠型の形
状をもつものについてその一対角線上の二隅を切断し、
二ケのL型形状の物に分割する、あるいは、十字形状の
ものについてその中心部を切断することにより二ケのL
型形状の物、又は、四ヶの平板形状の物に分割する様な
作業を実施する様な場合、これらの作業によって発生す
るプール水中にイオンとして存在しうる様な放射性物質
についての除去について考慮がされておらず、このため
、従来技術で除去不能であるイオン状でプール水中に溶
存している放射性物質がプール水中に蓄積し.経時的に
プール水の放射能濃度が上昇する。また、プール水放射
能濃度の上列に伴い放射性固体廃棄物貯蔵プールの廻り
での作業環境で3ー 4 の雰囲気線量率が上昇する等の問題があった。
The above conventional technology is used to install spent fuel, used control rods, channel boxes, etc. in predetermined positions in a radioactive solid waste storage pool by remote control from above the water surface of the pool. However, in order to make this possible safely and reliably, a mesh filter is installed in the pool water circulation system to remove impurities in the pool water and improve the clarity of the pool water. It was the main focus. However, when the aforementioned used control rods and channel boxes are placed in pool water, for example, if they have a rectangular frame shape, two corners on one diagonal are cut off.
By dividing into two L-shaped objects, or by cutting the center of a cross-shaped object, two L-shaped objects can be created.
When performing work that involves dividing mold-shaped objects or four flat-shaped objects, consider the removal of radioactive substances that may exist as ions in the pool water generated by these operations. As a result, radioactive substances dissolved in the pool water in ionic form, which cannot be removed using conventional techniques, accumulate in the pool water. Radioactivity concentration in pool water increases over time. In addition, there were problems such as an increase in the atmospheric dose rate of 3-4 in the working environment around the radioactive solid waste storage pool as the pool water radioactivity concentration increased.

本発明は従来技術で除去不能でありプール水の放射能濃
度の経時的上昇の要因となっているプール水中にイオン
状で溶存している放射性物質について、プール水の一部
を抜き出しこれをイオン交換能力をもつ浄化装置を通過
させることにより除去した後に放射性固体廃棄物貯蔵プ
ールに戻すことにより、プール水全体の放射能濃度を低
減し、さらに、放射性固体廃棄物貯蔵プール廻りでの線
量率低下による被曝の低減を目的としている。さらに、
本発明におけるイオン交換能力をもつ浄化装置の一部、
特に、プール水の浄化により放射能が蓄積していく部分
について、これを放射性固体廃棄物プールのプール水中
に設置することにより、浄化装置の上部のプール水によ
りプール水面上への放射線を遮蔽可能とすること、及び
浄化装置の性能が低下した場合、水中作業により浄化装
置の一部を新しいものと交換可能とすることにより、プ
ール廻りでの作業で一層の被曝低減を図ることを目的と
する。
The present invention removes a portion of the pool water and ionizes it to remove radioactive substances dissolved in ionic form in the pool water, which cannot be removed using conventional techniques and is a cause of the increase in the radioactivity concentration of the pool water over time. By passing it through a purification device with exchange capacity and returning it to the radioactive solid waste storage pool, the overall radioactivity concentration of the pool water is reduced, and the dose rate around the radioactive solid waste storage pool is also reduced. The aim is to reduce radiation exposure due to moreover,
A part of the purification device having ion exchange ability in the present invention,
In particular, in the area where radioactivity accumulates due to pool water purification, by installing this in the pool water of a radioactive solid waste pool, the pool water above the purification device can shield the radiation on the pool water surface. The aim is to further reduce radiation exposure when working around pools by making it possible to replace part of the purification device with a new one by doing underwater work if the performance of the purification device deteriorates. .

〔課題を解決するための手段〕[Means to solve the problem]

上記目的を達成するため、高放射性固体廃棄物貯蔵プー
ルにおいて、プール水の循環装置を設け、循環装置中に
イオン除去能力をもつ浄化装置を設置したものである。
In order to achieve the above object, a highly radioactive solid waste storage pool is provided with a pool water circulation device, and a purification device with ion removal ability is installed in the circulation device.

また、プール廻りでの作業における被曝低減のためには
、イオン除去能力をもつ浄化装置の一部をプール水中へ
の設置する方式とし、さらに本浄化装置の性能が低下し
た際の交換作業が水中で遠隔でも容易に実施可能ならし
むるため浄化装置の内、性能低下により交換を要する部
品についての取合部を公知のワンタッチジョイン1・化
することにより、浄化装置の運転時及び交換交業時にお
ける作業員の被曝の低減を実現したものである。
In addition, in order to reduce radiation exposure during work around pools, a part of the purification device with ion removal ability is installed in the pool water, and when the performance of this purification device deteriorates, replacement work is done underwater. In order to make it possible to easily carry out the operation even remotely, by using a well-known one-touch join 1 for the joints of parts of the purification system that require replacement due to performance deterioration, it is possible to easily perform the operation even when the purification system is in operation or during replacement work. This achieved a reduction in radiation exposure for workers.

イオン交換能力をもつ浄化装置の主要部は、カチオン交
換樹脂とア二オン交換樹脂を適当な比率で混合した公知
の混床式脱塩器、或いは、対象が高放射性固体廃棄物貯
蔵プールの場合、本発明で目的としている除去すべきイ
オン状でプール水中に溶存している放射性物質は主にC
 o − 6 0 ,M n − 5 4等の重金属核
種であることから,特に、これらの重金属イオンに対し
て選択的に吸着性をもつことが知られているオキシン添
着炭等が有効と考えられる。
The main part of the purification device with ion exchange ability is a known mixed bed desalter that mixes cation exchange resin and anion exchange resin in an appropriate ratio, or if the target is a highly radioactive solid waste storage pool. The ionic radioactive substances that are to be removed in the present invention and are dissolved in pool water are mainly C.
Since these are heavy metal nuclides such as O-60 and Mn-54, oxine-impregnated carbon, which is known to selectively adsorb these heavy metal ions, is considered to be particularly effective. .

前者の混床式脱塩器を浄化装置の主要部として採用する
場合,プール水中で主に存在するイオン状放射性物質は
前述の様にC o − 6 Q , ,M n −54
等のカチオン性のイオンであるため、これらのイオンを
除去する目的だけに絞れば、脱塩器をカチオン樹脂とア
二オン樹脂を適当な比率で混合した温床式脱塩器とする
必要はないが、脱塩器をカチオン樹脂のみの構成とした
場合、脱塩器がCo−60,Mn−54等のカチオン性
イオンをカチオン樹脂で捕捉しイオン交換する過程にお
いて、カチオン樹脂からイオン交換により追い出される
水素イオンがプール水中に回収されていくことになるた
め、この結果として経時的にプール水のP Hが低下す
る問題が発生する。この様な問題を防止するため、脱塩
器はカチオン樹脂とア二オン樹脂を適当な比率で混合し
た混床式とすることによりプール水のP Hの低下を防
ぐことが可能となる。
When the former mixed bed desalination device is adopted as the main part of the purification system, the ionic radioactive substances mainly present in the pool water are Co-6Q, , Mn-54 as mentioned above.
Since these ions are cationic ions, if the purpose is only to remove these ions, there is no need for the demineralizer to be a hotbed type demineralizer that mixes cationic resin and anionic resin in an appropriate ratio. However, when the demineralizer is configured with only cationic resin, in the process of the demineralizer capturing cationic ions such as Co-60 and Mn-54 with the cationic resin and ion-exchanging them, the cationic ions are expelled from the cationic resin by ion exchange. Since the hydrogen ions that are removed are collected into the pool water, this results in a problem in which the pH of the pool water decreases over time. In order to prevent such problems, the demineralizer is of a mixed bed type in which a cation resin and an anion resin are mixed in an appropriate ratio, thereby making it possible to prevent a drop in the pH of the pool water.

〔作用〕[Effect]

本発明による放射性物質の除去装置は高放射性固体廃棄
物貯蔵プール等のプール水中に溶存するイオン状の放射
性物質を効率良く除去することが可能であるため、プー
ル水の放射能濃度低下、及び、プール廻りの線量率低下
による作業員の被曝の低減が実現される。
The radioactive substance removal device according to the present invention is capable of efficiently removing ionic radioactive substances dissolved in pool water such as a highly radioactive solid waste storage pool, thereby reducing the radioactive concentration of pool water and A reduction in radiation exposure for workers will be achieved by lowering the dose rate around the pool.

〔実施例〕〔Example〕

以下、本発明の一実旅例を第工図により説明する。放射
性固体廃棄物貯蔵プール1内にはプール水2が充填され
ており、プール水2中に本発明を構成する濾過器5と脱
塩器6が設置されている。
Hereinafter, a practical example of the present invention will be explained with reference to the drawing. A radioactive solid waste storage pool 1 is filled with pool water 2, and a filter 5 and a demineralizer 6 that constitute the present invention are installed in the pool water 2.

濾過器5は内部に図示されない、例えば、1μm程度の
開孔をもったフィルタエレメントをもっており、また、
脱塩器6は、第3図に示す様に,内部にカチオン交換樹
脂とア二オン交換樹脂を、例えば、50 : 50から
80:70の様な適当な比率で混合した樹脂床64をも
っている。
The filter 5 has a filter element (not shown) having openings of, for example, about 1 μm inside, and
As shown in FIG. 3, the demineralizer 6 has a resin bed 64 in which a cation exchange resin and an anion exchange resin are mixed at an appropriate ratio, for example, 50:50 to 80:70. .

7 8− プール水2の水面32はプール水2がオーバフロータン
ク3ヘオーバーフローすることにより、一定液位になる
ように保たれており、常時、レベル計3王によりプール
水面32が所定値であることを監視している。濾過器5
、及び、脱塩器6は、プール水2をオーバフロータンク
3、および、プール水ポンプ4等から構成される閉ルー
プに設置される。放射性固体廃棄物貯蔵プール土中のプ
ール水2はオーバフロータンク3に流入し、オーバフロ
ータンク3に貯蔵された水はプール水ポンプ4により流
量調整弁20により一定流量で閉ループを移送される。
7 8- The water surface 32 of the pool water 2 is maintained at a constant level by overflowing the pool water 2 into the overflow tank 3, and the level meter 3 always indicates that the pool water surface 32 is at a predetermined value. I'm monitoring that. Filter 5
, and the demineralizer 6 are installed in a closed loop that includes the pool water 2, an overflow tank 3, a pool water pump 4, and the like. Pool water 2 in the soil of the radioactive solid waste storage pool flows into an overflow tank 3, and the water stored in the overflow tank 3 is transferred in a closed loop at a constant flow rate by a pool water pump 4 and a flow rate regulating valve 20.

プール水ポンプ4により移送された水は濾過器人口弁4
1,および、濾過器入口ワンタッチジョイント44を経
て、濾過器5に流入する。流入した水中に含有されるご
み、あるいは、錆等の不溶解性は不純物は濾過器5によ
って除去される。不溶解性の不純物が除去された後の水
は濾過器5を出た後、濾過器出口ワンタッチジョイント
45、および、脱塩器六口弁42、および、脱塩器入口
ワンタッチジョイント46を経て脱塩器6に流入する。
The water transferred by the pool water pump 4 is passed through the filter valve 4
1, and flows into the filter 5 through the filter inlet one-touch joint 44. Dust and insoluble impurities such as rust contained in the inflowing water are removed by a filter 5. After insoluble impurities have been removed, the water exits the filter 5 and is demineralized via the filter outlet one-touch joint 45, the desalter six-port valve 42, and the desalter inlet one-touch joint 46. It flows into the salter 6.

ここで脱塩器6の構成を第3図により詳細に説明する。Here, the configuration of the demineralizer 6 will be explained in detail with reference to FIG. 3.

流入水は脱塩器入口ワンタッチジョイント46、および
、脱塩器入口管61を経て脱塩器6内に入る。脱塩器入
口管61の水出口部には整流板63を設けており、流入
水が樹脂床64の」二部より樹脂床64に均一に分散さ
れる。水はカチオン交換樹脂とア二オン交換樹脂が混合
された摺脂床64を上から下に通過する間に、イオン交
換作用により水中に含有される濾過器5で除去されなか
った溶解性(イオン状)の放射性物質が樹脂床64に捕
捉除去される。樹脂床64を通過した水は、樹脂が通過
し得ない程度の例えば20メッシュ程度の開孔をもつス
クリーン65を通り説塩器出口管62、および、脱塩器
出口ワンタッチジョイント47を経て脱塩器6から排出
される。
The inflow water enters the demineralizer 6 through the demineralizer inlet one-touch joint 46 and the demineralizer inlet pipe 61. A rectifier plate 63 is provided at the water outlet of the demineralizer inlet pipe 61, and the inflow water is uniformly dispersed into the resin bed 64 from the second part of the resin bed 64. While water passes from top to bottom through a resin bed 64 in which a cation exchange resin and an anion exchange resin are mixed, soluble (ions) contained in the water that were not removed by the filter 5 due to ion exchange action are removed. The radioactive substances of the type (1) are captured and removed by the resin bed 64. The water that has passed through the resin bed 64 passes through a screen 65 with holes of, for example, about 20 mesh, which prevents the resin from passing through, and is demineralized via the desalinator outlet pipe 62 and the demineralizer outlet one-touch joint 47. It is discharged from the container 6.

第1図に戻り、脱塩器6から排出された処理水は脱塩器
出口弁43、および、プール水2中に設置されたスパー
ジャ30を経てプール1中に回収され、元のプール水2
と混合される。以上の様な閉ループでのプール水2の循
環運転を行なうことにより、プール水2中の不溶解性、
および、溶解性の不純物が濾過器5、および、脱塩器6
により効率良く除去され、全体としてプール水2の清澄
化が図られることとなる。
Returning to FIG. 1, the treated water discharged from the demineralizer 6 is recovered into the pool 1 through the demineralizer outlet valve 43 and the sparger 30 installed in the pool water 2, and is returned to the pool water 2.
mixed with. By circulating the pool water 2 in a closed loop as described above, insolubility in the pool water 2,
And soluble impurities are removed from the filter 5 and desalter 6
Therefore, the pool water 2 is efficiently removed, and the pool water 2 is clarified as a whole.

次に、濾過器5、および、脱塩器6の運転監視方法につ
いて説明する。閉ループには濾過器入1コ放射能濃度計
21、脱塩器出口放射能濃度計22、および、濾過器差
圧計23が設けられている。濾過器5はメッシュタイプ
のエレメントによる不純物の除去を主体としているため
、運転経過に伴い濾過器5の入口、出口の差圧がエレメ
ントの目詰りにより上昇するが、この状態を濾過器差圧
計23により監視し、差圧が所定値に達することで濾過
器5の寿命を判定する。一方、脱塩器6はプール水2中
のイオン状不純物の除去を主体としているが、脱塩器出
口放射能濃度計22の指示が上昇し、濾過器入口放射能
濃度計21の指示に近づくことにより寿命を判定するこ
とができる。各々このようにして寿命に達し性能が低下
した濾過器5、または、脱塩器6は、プール水2中で濾
過器入口弁4l、および、脱塩器入口弁42、または、
脱塩器入口弁42、および、脱塩器出口弁43を閉じ、
閉ループの中で隔離された後、各々の入口,出口のワン
タッチジョイントを遠隔で分離される。
Next, a method for monitoring the operation of the filter 5 and demineralizer 6 will be explained. The closed loop is provided with a radioactivity densitometer 21 containing a filter, a radioactivity densitometer 22 at the outlet of the demineralizer, and a filter differential pressure gauge 23. Since the filter 5 mainly uses a mesh type element to remove impurities, the differential pressure between the inlet and outlet of the filter 5 increases due to clogging of the element as the operation progresses. The life of the filter 5 is determined when the differential pressure reaches a predetermined value. On the other hand, the demineralizer 6 mainly removes ionic impurities from the pool water 2, but the indication on the demineralizer outlet radioactivity densitometer 22 increases and approaches the indication on the filter inlet radioactivity densitometer 21. This allows the lifespan to be determined. The filter 5 or demineralizer 6, which has reached the end of its life in this way and whose performance has deteriorated, has a filter inlet valve 4l, a demineralizer inlet valve 42, or a demineralizer inlet valve 41 in the pool water 2.
Close the demineralizer inlet valve 42 and the demineralizer outlet valve 43,
After being isolated in a closed loop, each inlet and outlet one-touch joint is remotely separated.

分離された、例えば、脱塩器6は第3図中に示す吊具6
6に図示されない治具によりプール水面32上からの操
作で吊り上げられ所定の位置に移動,保管される。
For example, the demineralizer 6 is separated from the hanging device 6 shown in FIG.
It is lifted up from above the pool water surface 32 by a jig (not shown) at 6, moved to a predetermined position, and stored.

一方、新しい濾過器5、または、脱塩器6は以前の位置
に各々入口,出口のワンタッチジョイントを接続される
ことにより設置され、再び、閉ループを構威した後,運
転に供される。
On the other hand, a new filter 5 or demineralizer 6 is installed by connecting the inlet and outlet one-touch joints to the previous positions, respectively, and is put into operation after establishing a closed loop again.

第2図は既にプール水2中に不溶解性不純物を除去する
設備をもっているプール1に対して、プール水2中の溶
解性のイオン状不純物除去能力を追加付与する場合の本
発明の実施例を示したものである。プール水2中に設け
られた取水管48より循環ポンプ7で吸い上げらけたプ
ール水は、ポンプの作用により脱塩器入口弁42、およ
び、脱−11ー 12 塩器入口ワンタッチジョイントを経て脱塩器6に送られ
る。脱塩器6で前述の実施例と同様の方法で水中のイオ
ン状放射性物質が除去された処理水は脱塩器出ロワンタ
ッチジョイント47、および、脱塩器出目弁43を経て
排水管49よりプール1中に回収され、元のプール水2
と混合される。
FIG. 2 shows an embodiment of the present invention in which the ability to remove soluble ionic impurities from the pool water 2 is additionally provided to the pool 1 which already has equipment for removing insoluble impurities from the pool water 2. This is what is shown. The pool water sucked up by the circulation pump 7 from the water intake pipe 48 provided in the pool water 2 is desalinated by the action of the pump through the demineralizer inlet valve 42 and the demineralizer inlet one-touch joint 11-12. Sent to vessel 6. The treated water from which ionic radioactive substances have been removed in the desalter 6 in the same manner as in the above-mentioned embodiment passes through the desalter outlet row one touch joint 47 and the desalter outlet valve 43 to the drain pipe 49. The original pool water 2 is recovered into pool 1.
mixed with.

脱塩器入口放射能濃度計21、および、脱塩器出口放射
能濃度計22の作用と性能低下時の脱塩器6の交換方法
は前述の実施例と同様である。
The functions of the demineralizer inlet radioactivity densitometer 21 and the demineralizer outlet radioactivity densitometer 22 and the method of replacing the demineralizer 6 when the performance deteriorates are the same as in the previous embodiment.

本実施例によれば、プール水2中に含まれるイオン状の
放射性物質を除去することが可能となるため、プール水
2の放射能濃度を低減することができる。メッシュタイ
プの濾過器5のみでプール水2を循環処理している実例
でプール水中の放射能の内90〜95%がイオン状であ
ることが報告されており、この様なケースに本発明の第
2図に示す様な実施例を採用するとプール水2の放射能
濃度を現状の十分の1以下に低減することが可能となる
According to this embodiment, it is possible to remove ionic radioactive substances contained in the pool water 2, so that the radioactivity concentration of the pool water 2 can be reduced. In an actual example where pool water 2 is circulated using only a mesh type filter 5, it has been reported that 90 to 95% of the radioactivity in the pool water is in the ionic form, and the present invention can be applied to such cases. If the embodiment shown in FIG. 2 is adopted, it becomes possible to reduce the radioactive concentration of the pool water 2 to less than one-tenth of the current level.

〔発発の効果〕[Effect of departure]

本発明によれば、放射線遮蔽材であるプール水中で脱塩
器の交換作業を実施することができるので、作業員の放
射線被曝を低減することができる。
According to the present invention, it is possible to replace the demineralizer in pool water, which is a radiation shielding material, so that radiation exposure of workers can be reduced.

【図面の簡単な説明】[Brief explanation of drawings]

第1図,第2図は本発明の一実施例の系統図、第3図は
第1図の脱塩器の縦断面図である。 l・・・放射性固体廃棄物貯蔵プール、2・・・プール
水、5・・・濾過器、6・・・脱塩器、21.22・・
・放射能濃度計、23・・・差圧計、44.,45,4
6,4.7・・−特開乎 3 29897 (5) 第3図 η6fロヨ,
1 and 2 are system diagrams of an embodiment of the present invention, and FIG. 3 is a longitudinal sectional view of the desalination device shown in FIG. 1. 1...Radioactive solid waste storage pool, 2...Pool water, 5...Filter, 6...Demineralizer, 21.22...
・Radioactive densitometer, 23...Differential pressure gauge, 44. ,45,4
6,4.7...-JP-A-3 29897 (5) Figure 3 η6f Royo,

Claims (1)

【特許請求の範囲】[Claims] 1、原子力発電所等における放射性固体廃棄物貯蔵プー
ルのプール水中に設置される放射性物質除去装置、前記
放射性固体廃棄物貯蔵プールの水を取り込み、イオン状
に水中に溶解した放射性物質を除去した後、浄化水を前
記放射性固体廃棄物貯蔵プールへ戻し、この作用により
浄化性能が低下した前記放射性物質除去装置は水中で隔
離した後、水中に貯蔵保管され、新しい前記放射性物質
除去装置を前記放射性固体廃棄物貯蔵プールのプール水
中に設置することによりプール水の浄化を行なう放射性
固体廃棄物貯蔵プールより放射性物質の除去方法。
1. A radioactive substance removal device installed in the pool water of a radioactive solid waste storage pool at a nuclear power plant, etc., after taking in the water of the radioactive solid waste storage pool and removing radioactive substances dissolved in the water in ionic form. , the purified water is returned to the radioactive solid waste storage pool, and the radioactive material removal device whose purification performance has been degraded due to this action is isolated in water and then stored underwater, and the new radioactive material removal device is returned to the radioactive solid waste storage pool. A method for removing radioactive materials from a radioactive solid waste storage pool, which purifies the pool water by installing the pool in the water of the waste storage pool.
JP16398889A 1989-06-28 1989-06-28 Method of removing radioactive substances from radioactive solid waste storage pool Pending JPH0329897A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16398889A JPH0329897A (en) 1989-06-28 1989-06-28 Method of removing radioactive substances from radioactive solid waste storage pool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16398889A JPH0329897A (en) 1989-06-28 1989-06-28 Method of removing radioactive substances from radioactive solid waste storage pool

Publications (1)

Publication Number Publication Date
JPH0329897A true JPH0329897A (en) 1991-02-07

Family

ID=15784628

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16398889A Pending JPH0329897A (en) 1989-06-28 1989-06-28 Method of removing radioactive substances from radioactive solid waste storage pool

Country Status (1)

Country Link
JP (1) JPH0329897A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04361630A (en) * 1991-06-04 1992-12-15 Murata Mach Ltd Method for threading elastic yarn in apparatus for spinning cored yarn
CN104485147A (en) * 2014-10-31 2015-04-01 中国核电工程有限公司 Distant filter device
CN112685880A (en) * 2020-12-16 2021-04-20 海南省设计研究院有限公司 Design method for optimizing scale of combined system overflow storage tank

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04361630A (en) * 1991-06-04 1992-12-15 Murata Mach Ltd Method for threading elastic yarn in apparatus for spinning cored yarn
CN104485147A (en) * 2014-10-31 2015-04-01 中国核电工程有限公司 Distant filter device
CN112685880A (en) * 2020-12-16 2021-04-20 海南省设计研究院有限公司 Design method for optimizing scale of combined system overflow storage tank

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