JPH079478B2 - Chemical decontamination waste liquid treatment method - Google Patents
Chemical decontamination waste liquid treatment methodInfo
- Publication number
- JPH079478B2 JPH079478B2 JP61033754A JP3375486A JPH079478B2 JP H079478 B2 JPH079478 B2 JP H079478B2 JP 61033754 A JP61033754 A JP 61033754A JP 3375486 A JP3375486 A JP 3375486A JP H079478 B2 JPH079478 B2 JP H079478B2
- Authority
- JP
- Japan
- Prior art keywords
- waste liquid
- chemical decontamination
- tank
- alkaline
- acid
- 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
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、化学除染廃液の処理方法に関し、特に原子炉
の一次冷却材ポンプ（RCP）のケーシングを除いたイン
ペラー、主軸、主フランジ等の部分（インターナル）の
化学除染廃液を減溶化を目的として処理する方法に関す
る。Description: TECHNICAL FIELD The present invention relates to a method for treating chemical decontamination waste liquid, and particularly to an impeller, a main shaft, a main flange, etc. excluding a casing of a primary coolant pump (RCP) of a nuclear reactor. The present invention relates to a method for treating the chemical decontamination waste liquid in the part (internal) for the purpose of reducing the solubility.
（従来の技術） RCPインターナルの化学除染は、例えば第１表に示す化
学洗浄剤である酸およびアルカリ溶液を用いる所謂二液
法により行う。(Prior Art) Chemical decontamination of RCP internals is carried out by a so-called two-liquid method using an acid and alkali solution as a chemical cleaning agent shown in Table 1, for example.
すなわち、先ず第１液（希薄アルカリ溶液）で表面のク
ラツドを溶けやすい状態にし、次に第２液（希薄酸溶
液）でこれを溶解除去する。この過程において、酸、ア
ルカリといつた化学洗浄剤の残留を防止する為、各液で
の処理後に純水洗浄を実施する。 That is, first, the first solution (dilute alkaline solution) is used to make the surface cladding easily soluble, and then the second solution (dilute acid solution) dissolves and removes it. In this process, cleaning with pure water is carried out after the treatment with each liquid in order to prevent the chemical cleaning agent from remaining such as acid and alkali.
この処理後の第１液廃液と第１液処理後の純水洗浄排水
を希薄アルカリ溶液としてアルカリタンクに貯留し、ま
た処理後の第２液排液と第２液処理後の純水洗浄排水を
希薄酸溶液として酸タンクに貯留する。The first liquid waste liquid after this treatment and the pure water cleaning drainage after the first liquid treatment are stored in an alkaline tank as a diluted alkaline solution, and the second liquid waste liquid after the treatment and the pure water cleaning drainage after the second liquid treatment are stored. Is stored in the acid tank as a dilute acid solution.
これらの溶液と、これら溶液を処理した後に各タンクを
純水洗浄したアルカリタンク洗浄水と酸タンク洗浄水と
を、RCPインターナル除染廃液として処理する必要があ
る。It is necessary to treat these solutions and the alkaline tank washing water and the acid tank washing water obtained by washing each tank with pure water after treating these solutions as RCP internal decontamination waste liquid.
このとき、希薄酸溶液は、25％苛性ソーダで中和した
後、処理することが一般に行われている。At this time, the diluted acid solution is generally neutralized with 25% caustic soda and then treated.
以上の、RCPインターナル除染廃液の処理法として、従
来は、仮設真空式セメント固化装置を用い、第２図に示
すフローにより、上記廃液をドラミングする方法が採用
されている。As a method for treating the RCP internal decontamination waste liquid described above, a method of drumming the waste liquid has been conventionally used by using a temporary vacuum cement hardening device and following the flow shown in FIG.
第２図において、一点鎖線の矢示右方領域が仮設真空セ
メント固化装置であり、移送ポンプ01、廃液計量タンク
02、気化分離器03、真空ポンプ04、洗浄用純水計量タン
ク05、純水ライン06からなる。In FIG. 2, the area on the right side of the arrow indicated by the alternate long and short dash line is the temporary vacuum cement solidification device, and the transfer pump 01 and the waste liquid measuring tank
02, vaporizer 03, vacuum pump 04, cleaning pure water measuring tank 05, pure water line 06.
RCPインターナル除染溌液中の希薄酸溶液と酸タンク洗
浄水は第２図中の酸タンク07へ希薄アルカリ溶液とアル
カリタンク洗浄水はアルカリタンク08へ各々貯留されて
いる。The diluted acid solution and the acid tank cleaning water in the RCP internal decontamination solution are stored in the acid tank 07 shown in FIG. 2 and the diluted alkaline solution and the alkaline tank cleaning water are stored in the alkaline tank 08, respectively.
これらタンク07,08内の廃液は、各々次のフローにより
処理される。The waste liquids in these tanks 07 and 08 are processed by the following flows.
すなわち、タンク07又は08内の溶液は、移送ポンプ01に
て廃液計量タンク02へ送られる。一方、気水分離器03を
下降させて充填ドラム缶09にさし込み、真空ポンプ04に
て該ドラム缶09を真空にし、その真空圧を利用して該ド
ラム缶09に上記廃液を送る。That is, the solution in the tank 07 or 08 is sent to the waste liquid measuring tank 02 by the transfer pump 01. On the other hand, the steam separator 03 is lowered and inserted into the filling drum can 09, the drum can 09 is evacuated by the vacuum pump 04, and the vacuum pressure is utilized to send the waste liquid to the drum can 09.
廃液計量タンク02に廃液がなくなれば、純水ライン06よ
り供給される純水を洗浄用純水計量タンク05を経由して
気水分離器03に送り、気水分離器03を洗浄する。洗浄が
終われば、気水分離気03を上昇させて、充填ドラム缶09
を搬出する。この工程を、タンク07,08内の希薄酸溶
液、アルカリ溶液、酸タンク、アルカリタンク洗浄水が
なくなるまで繰り返す。When the waste liquid measuring tank 02 is exhausted, the pure water supplied from the pure water line 06 is sent to the steam separator 03 via the cleaning pure water measuring tank 05 to clean the steam separator 03. When the washing is completed, the air / water separation air 03 is raised and the filling drum 09
Carry out. This process is repeated until the dilute acid solution, the alkaline solution, the acid tank, and the alkaline tank cleaning water in the tanks 07 and 08 are exhausted.
なお、第２図中の10は苛性ソーダの注入ラインを示して
いる。In addition, 10 in FIG. 2 has shown the injection line of caustic soda.
（発明が解決しようとする問題点） 上記した従来技術においては、除染廃液を直接ドラミン
グ処理するため、処理量が多量であり、ドラム缶数が膨
大となり、ドラム缶の保管スペース、保管管理費用等に
おいて問題がある。(Problems to be Solved by the Invention) In the above-mentioned conventional technology, since the decontamination waste liquid is directly drummed, the processing amount is large, the number of drums becomes enormous, and the storage space of the drums, storage management cost, etc. There's a problem.
そこで、除染廃液の減容化が必要となる。この減容化技
術として、原子炉プラント本設の放射性廃棄物処理設備
（WDS）による処理が考えられる。Therefore, it is necessary to reduce the volume of decontamination waste liquid. As this volume reduction technology, treatment by the radioactive waste treatment facility (WDS) at the reactor plant is considered.
しかし、前出の第１表から明らかなように、酸溶液及び
酸タンク洗浄水には、アンモニア成分が含まれており、
WDS中の廃液蒸発装置で減容化処理する時に、アンモニ
アガスが発生し、電導度高の警報が出て、運転ができな
い。そして、WDS中の廃液蒸留水脱塩塔の樹脂がブレー
クする。また、酸溶液及び酸タンク洗浄水にはインヒビ
ター（腐食抑制剤）が含まれており、上記廃液蒸発装置
にかけると境界面に発泡現象がおこり、蒸発濃縮が阻害
される。However, as is clear from Table 1 above, the acid solution and the acid tank wash water contain ammonia components,
Ammonia gas is generated when the volume reduction process is performed by the waste liquid evaporator in WDS, and a high conductivity alarm is output, and operation cannot be performed. Then, the resin of the waste water distilled water desalination tower in WDS breaks. In addition, the acid solution and the acid tank washing water contain an inhibitor (corrosion inhibitor), and when applied to the above-mentioned waste liquid evaporator, a foaming phenomenon occurs at the boundary surface, and evaporation concentration is hindered.
一方、アルカリ溶液及び及びアルカリタンク洗浄水をWD
Sで処理しようとすると、硫酸で中和し、亜硫酸ソーダ
で還元する必要がある。このように還元すると硫酸カ
リ、硫酸ソーダが晶析し、多量の二酸化マンガンのスラ
ツジが発生し、全面マスクをして手作業でスコツプでド
ラム詰めを行なわねばならぬこともある。On the other hand, WD the alkaline solution and the alkaline tank cleaning water.
If you want to treat with S, you need to neutralize with sulfuric acid and reduce with sodium sulfite. When such reduction is performed, potassium sulfate and sodium sulfate are crystallized, a large amount of manganese dioxide sludge is generated, and it may be necessary to mask the entire surface and manually perform drum packing with a scoop.
また、除染廃液を流した場合、廃液中の放射性物質を含
むスラツジ等により、WDSの配管の表面線量率が上昇す
る。Also, when decontamination waste liquid is flowed, the surface dose rate of the WDS pipe increases due to sludge containing radioactive substances in the waste liquid.
本発明は、かかる化学除染廃液の減容化処理技術上の欠
点を解消し、化学除染廃液を効果的に減容処理する方法
を提供するものである。The present invention provides a method for effectively reducing the volume of a chemical decontamination waste liquid by solving the drawbacks in the volume reduction treatment technology of the chemical decontamination waste liquid.
（問題点を解決するための手段） 本発明は、化学除染廃液を原子炉プラント本設の放射性
廃棄物処理設備で処理するに際し、該化学除染廃液中の
酸性廃液は、苛性ソーダで中和し、混床式脱塩塔を通液
させて該廃液中のアンモニア成分を除去し、次いで活性
炭吸着塔を通液させて該廃液中のインヒビターを除去
し、一方前記化学除染廃液中のアルカリ性廃液は、硫酸
で中和し、次いで亜硫酸ソーダで還元し、発生したスラ
ツジをフイルターで除去し、しかる後、前記アンモニア
成分及びインヒビター除去後の酸性廃液と、前記中和・
還元・スラツジ除去後のアルカリ性廃液とを、前記放射
性廃棄物処理設備に送ることを特徴とする化学除染廃液
の処理方法に関する。(Means for Solving Problems) In the present invention, when the chemical decontamination waste liquid is treated in the radioactive waste treatment facility of the reactor plant main body, the acidic waste liquid in the chemical decontamination waste liquid is neutralized with caustic soda. Then, the mixed-bed desalting tower is passed through to remove the ammonia component in the waste solution, and then the activated carbon adsorption tower is passed through to remove the inhibitor in the waste solution, while the alkaline solution in the chemical decontamination waste solution is removed. The waste liquid is neutralized with sulfuric acid, then reduced with sodium sulfite, the generated sludge is removed with a filter, and then the acidic waste liquid after removal of the ammonia component and the inhibitor and the neutralization /
The present invention relates to a method for treating chemical decontamination waste liquid, which comprises sending the alkaline waste liquid after reduction and sludge removal to the radioactive waste treatment facility.
（作用） 本発明における混床式脱塩塔は、酸性廃液（すなわち、
前述した除染後の酸溶液、酸タンク洗浄水）中のアンモ
ニア濃度を下げるためのもので、好ましくは混床式塩塔
と該酸性廃液が貯留されている酸タンクとの間で該酸性
廃液を循環させる。酸溶液、酸タンク洗浄水は、アンモ
ニア濃度が高く、これを原子炉プラント本設の放射性廃
棄物処理設備（WDS）で処理可能なアンモニア濃度にま
で低減する（酸液、酸タンク洗浄水のアンモニア濃度が
30ppm以下であると共にウエストホールドアツプタンク
に20m3以上の保有水があれば、酸液、酸タンク洗浄水を
フロアードレンに流すことができる。この場合、ウエス
トホールドアツプタンクのアンモニア濃度が2ppm以下に
なる。）には、混床式脱塩塔の１回通液のみでは足りな
い場合があるからである。(Operation) The mixed bed type demineralization tower according to the present invention has an acidic waste liquid (that is,
The acid solution after decontamination described above, for lowering the ammonia concentration in the acid tank washing water), preferably the acidic waste liquid between the mixed bed salt tower and the acid tank in which the acidic waste liquid is stored. Circulate. The acid solution and the acid tank wash water have a high concentration of ammonia and reduce this to an ammonia concentration that can be processed by the radioactive waste treatment facility (WDS) of the reactor plant main building (acid solution, acid tank wash water ammonia Concentration
If it is less than 30ppm and the water held in the waist hold up tank is 20m 3 or more, the acid solution and the acid tank washing water can be flowed to the floor drain. In this case, the ammonia concentration in the waist hold up tank becomes 2 ppm or less. In (), there is a case that only one passage through the mixed bed type desalination tower is not enough.
上記の混床式脱塩塔、活性炭吸着塔への通液と、中和、
還元、スラツジの除去とにより、WDSで処理可能となつ
た化学除染廃液は、WDSのC/Vサンプタンクに流れ、ウエ
ストホールドアツプタンク（廃液貯蔵タンク）で貯留さ
れた後、WDEVAP（廃液蒸発装置）で濃縮され、蒸留水は
再使用され、濃縮後はアスフアルト固化設備で処理され
る。Mixed bed type desalination tower, passing through an activated carbon adsorption tower, and neutralization,
The chemical decontamination waste liquid that can be processed by WDS by reduction and sludge flow flows to the C / V sump tank of WDS, is stored in the waist hold up tank (waste liquid storage tank), and then WDEVAP (waste liquid evaporation) Equipment), distilled water is reused, and after concentration, it is treated in an asphalt solidification facility.
このように本発明では、酸溶液、アルカリ溶液、酸タン
ク洗浄水、およびアルカリタンク洗浄水といつた化学除
染廃液を従来実施していた仮設真空式セメント固化装置
にてドラミングをせずに、プラント本設のWDSへ流し
て、廃棄物ドラム缶数を減らし、RCPインターナル除染
廃液の減容化を実施するものであり、このWDSでの処理
が有効に行えるよう、上記廃液を処理するものである。Thus, in the present invention, the acid solution, the alkaline solution, the acid tank cleaning water, and without drumming in the temporary vacuum cement solidification device that has been conventionally carried out chemical tank decontamination waste liquid and alkaline tank cleaning water, The waste liquid can be sent to the WDS of the main plant to reduce the number of waste drums and reduce the volume of the RCP internal decontamination waste liquid. The waste liquid is processed so that the WDS can be effectively processed. Is.
（実施例） 第１図は、本発明方法の一実施態様例のフローを示す図
である。(Example) FIG. 1 is a diagram showing the flow of one embodiment of the method of the present invention.
第１図において、酸タンク７に貯留されている酸溶液及
び酸タンク洗浄水については、ライン10からの苛性ソー
ダで中和し、これを循環ポンプ11で酸タンク７と混床式
脱塩塔12を循環させて、該混床式脱塩塔12にてアンモニ
アを除去した後、活性炭吸着塔13へ送り、該活性炭吸着
塔13の活性炭にインヒビターを吸着させ、フロアドレン
（床に設けてある目皿）14を経て図示省略のWDSへ送ら
れ、処理される。In FIG. 1, the acid solution and the acid tank washing water stored in the acid tank 7 are neutralized with caustic soda from the line 10, and the neutralized pump 11 circulates the acid tank 7 and the mixed bed desalting tower 12 To remove the ammonia in the mixed bed type demineralization tower 12 and then sent to the activated carbon adsorption tower 13 to adsorb the inhibitor to the activated carbon of the activated carbon adsorption tower 13 and to remove the floor drain ( It is sent to the WDS (not shown) via the plate 14 and processed.
一方、アルカリタンク８に貯留されているアルカリ溶液
およびアルカリタンク洗浄水については、ライン15から
供給される稀硫酸（10％程度）で中和（pH6〜９）した
後、ライン16から供給される亜硫酸ソーダで還元する。
還元して発生したスラツジ（Na2SO4やK2SO4の晶折物、M
nO2等のスラツジ）は、フイルター（５μ程度）17で除
去した後、フロアドレン14を経て図示省略のWDSへ送ら
れ、処理される。On the other hand, the alkaline solution and the alkaline tank cleaning water stored in the alkaline tank 8 are neutralized (pH 6-9) with diluted sulfuric acid (about 10%) supplied from the line 15 and then supplied from the line 16. Reduce with sodium sulfite.
Sludge (Na 2 SO 4 or K 2 SO 4 crystal fragment, M
After sludge (nO 2 etc.) is removed by a filter (about 5 μm) 17, it is sent through a floor drain 14 to a WDS (not shown) for processing.
（発明の効果） 本発明によるRCPインターナル除染廃液の減容対策は、
除染工事において発生する廃棄物ドラム缶数を減少させ
ることになり、プラント当りの年間発生量を少しでも低
くし、従つて、ドラム缶の保管がスペース、保管管理費
用を減ずるという効果が生まれる。(Effect of the invention) The volume reduction measure of the RCP internal decontamination waste liquid according to the present invention is
The number of waste drums generated during decontamination work will be reduced, and the annual amount generated per plant will be reduced as much as possible. Therefore, storage of drums will reduce space and storage management costs.
第１図は、本発明方法の一実施態様例のフローを示し、
第２図は、従来の仮設真空式セメント固化装置による処
理フローを示す。FIG. 1 shows the flow of one embodiment of the method of the present invention,
FIG. 2 shows a processing flow by a conventional temporary vacuum cement hardening apparatus.
Claims (1)
性廃棄物処理設備で処理するに際し、該化学除染廃液中
の酸性廃液は、苛性ソーダで中和し、混床式脱塩塔を通
液させて該廃液中のアンモニア成分を除去し、次いで活
性炭吸着塔を通液させて該廃液中のインヒビターを除去
し、一方前記化学除染廃液中のアルカリ性廃液は、硫酸
で中和し、次いで亜硫酸ソーダで還元し、発生したスラ
ツジをフイルターで除去し、しかる後、前記アンモニア
成分及びインヒビター除去後の酸性廃液と、前記中和・
還元・スラツジ除去後のアルカリ性廃液とを、前記放射
性廃棄物処理設備に送ることを特徴とする化学除染廃液
の処理方法。1. When the chemical decontamination waste liquid is treated in the radioactive waste treatment facility of the nuclear reactor plant, the acidic waste liquid in the chemical decontamination waste liquid is neutralized with caustic soda and the mixed bed desalting tower is used. The waste liquid is passed through to remove the ammonia component, and then the activated carbon adsorption tower is passed through to remove the inhibitor in the waste liquid, while the alkaline waste liquid in the chemical decontamination waste liquid is neutralized with sulfuric acid, Then, it is reduced with sodium sulfite, and the generated sludge is removed with a filter.
A method for treating chemical decontamination waste liquid, comprising sending the alkaline waste liquid after reduction and sludge removal to the radioactive waste treatment facility.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61033754A JPH079478B2 (en) | 1986-02-20 | 1986-02-20 | Chemical decontamination waste liquid treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61033754A JPH079478B2 (en) | 1986-02-20 | 1986-02-20 | Chemical decontamination waste liquid treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62192698A JPS62192698A (en) | 1987-08-24 |
| JPH079478B2 true JPH079478B2 (en) | 1995-02-01 |
Family
ID=12395212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61033754A Expired - Lifetime JPH079478B2 (en) | 1986-02-20 | 1986-02-20 | Chemical decontamination waste liquid treatment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH079478B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104291489B (en) * | 2014-10-15 | 2015-12-02 | 清华大学 | The treatment process of high temperature gas-cooled Nuclear fuel core core preparation technology waste water |
| CN109166636B (en) * | 2018-08-06 | 2023-08-25 | 广东核电合营有限公司 | System and method for uninterrupted purification of primary circuit of pressurized water reactor nuclear motor unit |
-
1986
- 1986-02-20 JP JP61033754A patent/JPH079478B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62192698A (en) | 1987-08-24 |
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