JPH07119833B2 - Chemical decontamination agent - Google Patents
Chemical decontamination agentInfo
- Publication number
- JPH07119833B2 JPH07119833B2 JP63068837A JP6883788A JPH07119833B2 JP H07119833 B2 JPH07119833 B2 JP H07119833B2 JP 63068837 A JP63068837 A JP 63068837A JP 6883788 A JP6883788 A JP 6883788A JP H07119833 B2 JPH07119833 B2 JP H07119833B2
- Authority
- JP
- Japan
- Prior art keywords
- decontamination
- chemical
- clad
- oxalic acid
- 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
- 238000009390 chemical decontamination Methods 0.000 title claims description 16
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 66
- 235000006408 oxalic acid Nutrition 0.000 claims description 22
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 230000002285 radioactive effect Effects 0.000 claims description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 19
- 238000005202 decontamination Methods 0.000 description 17
- 230000003588 decontaminative effect Effects 0.000 description 17
- 239000003153 chemical reaction reagent Substances 0.000 description 13
- 239000000126 substance Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 238000009835 boiling Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 230000005855 radiation Effects 0.000 description 4
- 229910000975 Carbon steel Inorganic materials 0.000 description 3
- 239000010962 carbon steel Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000003112 inhibitor Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 description 1
- 239000002211 L-ascorbic acid Substances 0.000 description 1
- 235000000069 L-ascorbic acid Nutrition 0.000 description 1
- 229960005070 ascorbic acid Drugs 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
Landscapes
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Description
【発明の詳細な説明】 「産業上の利用分野」 本発明は、原子炉一次系等に好適に用いられる化学除染
剤に係わり、特に配管、機器等の表面に付着する放射性
金属酸化物を除去する化学除染剤に関する。The present invention relates to a chemical decontamination reagent preferably used for a primary system of a nuclear reactor or the like, and particularly to a radioactive metal oxide attached to the surface of pipes, equipment and the like. It relates to a chemical decontaminating agent to be removed.
「従来の技術」 一般に、原子力発電プラントには、炭素鋼やオーステナ
イト系ステンレス鋼材等が使用されているが、沸騰水型
原子炉や加圧水型原子炉の場合であると、原子炉冷却材
として水を使用しているために、核加熱によって放射化
された60Co、54Mn、134Cs及びその酸化物等（以下、ク
ラッドという）が、原子炉の一次冷却系の配管等に次第
に付着し、管路の放射線量を上昇させてしまう可能性が
ある。"Prior art" Generally, carbon steel and austenitic stainless steel materials are used in nuclear power plants, but in the case of boiling water reactors and pressurized water reactors, water is used as the reactor coolant. Since 60 Co, 54 Mn, 134 Cs and its oxides (hereinafter referred to as clad) activated by nuclear heating gradually adhere to the primary cooling system piping of the reactor, It may increase the radiation dose in the pipeline.
したがって、原子炉冷却水用の配管やその部品、機器等
においては、材料の吟味を十分に行うことが必要とされ
るとともに、原子炉建設時等において、例えばステンレ
ス鋼管の場合であると、その内部に300℃の高温加湿空
気を150時間程度以上流通させる方法で、クラッド（放
射化粒子）に対して化学的な親和性を持たせないような
表面処理を予め施しておくことが有効である。Therefore, it is necessary to thoroughly examine the materials of the reactor cooling water piping, its parts, equipment, etc., and at the time of reactor construction, for example, in the case of stainless steel pipe, It is effective to carry out a surface treatment that does not have a chemical affinity for the clad (activated particles) in advance by circulating hot humidified air of 300 ° C for 150 hours or more. .
一方、このような表面処理を施した場合であっても、原
子炉を一度運転すると、クラッドが配管等の構成母材の
表面に徐々に付着する現象が生じるとともに、60Co等
が、母材表面に付着したクラッド及び母材表面の酸化層
（Fe2O3酸化層、Fe3O4耐食性層、不働態化被膜層等）の
中に、内向拡散現象によって僅かずつ入り込む現象が加
わることや、ステンレス鋼等からニッケルが溶出して58
Coが生成される現象等により、配管系の放射線量が次第
に増加すると考えられる。On the other hand, even when such surface treatment is performed, once the reactor is operated, the phenomenon that the clad gradually adheres to the surface of the constituent base metal such as pipes, and 60 Co etc. There is a phenomenon that the phenomenon of intrusion into the cladding and the oxide layer (Fe 2 O 3 oxide layer, Fe 3 O 4 corrosion-resistant layer, passivation film layer, etc.) on the surface of the base material is gradually introduced due to the inward diffusion phenomenon. , Nickel is eluted from stainless steel, etc. 58
It is considered that the radiation dose in the piping system gradually increases due to the phenomenon that Co is generated.
従来、原子炉運転開始後において、クラッドを除去して
配管等の放射線量を低減する方法としては、定期点検時
や補修時に、ブラスト処理によってクラッド層を機械的
に研摩除去する方法が知られている。しかしながら、こ
のブラスト処理は、前記の母材表面に付着したクラッド
の軟質部を除去するには有効であるが、硬質部や母材表
面の酸化層を除去するには不十分であり、適用できな
い。そして、クラッド層における硬質スケールや母材酸
化被膜スケールに対しては、例えばクエン酸やシュウ酸
とを主剤とする液状の化学除染剤等を使用し、これによ
り除染を行うのが普通である。Conventionally, as a method of removing the clad and reducing the radiation dose to the piping etc. after starting the reactor operation, there is known a method of mechanically polishing and removing the clad layer by blasting at the time of periodic inspection and repair. There is. However, this blasting treatment is effective for removing the soft portion of the clad adhering to the surface of the base material, but is insufficient for removing the hard portion and the oxide layer on the surface of the base material, and cannot be applied. . Then, for the hard scale and the base material oxide film scale in the clad layer, for example, a liquid chemical decontaminating agent mainly containing citric acid or oxalic acid is used, and decontamination is usually performed by this. is there.
「発明が解決しようとする課題」 ところで、前記のクエン酸とシュウ酸とを主剤とする化
学除染剤にあっては、高除染率を得るのに100℃以上の
高温が必要となり、よって化学除染剤の沸騰を防ぐため
除染雰囲気を加圧しなくてはならず、これにより作業性
が損なわれるという問題がある。また、前記クエン酸と
シュウ酸とを主剤とする化学除染剤では、その水に対す
る溶解度が低いことから、溶液を作製しあるいはその濃
度を調製するなどに際し、高温のお湯を用意しなくては
ならないなど手間がかかるといった問題があり、さらに
は所望する除染度を得るのに長時間を要するといった不
都合もある。"Problems to be Solved by the Invention" By the way, in the chemical decontaminating agent containing citric acid and oxalic acid as main components, a high temperature of 100 ° C or higher is required to obtain a high decontamination rate, In order to prevent boiling of the chemical decontaminating agent, it is necessary to pressurize the decontaminating atmosphere, which causes a problem of impairing workability. Further, in the chemical decontaminating agent mainly composed of citric acid and oxalic acid, since its solubility in water is low, when preparing a solution or adjusting its concentration, it is necessary to prepare high-temperature hot water. However, there is a problem in that it takes time and labor, and it also takes a long time to obtain a desired decontamination degree.
本発明はこのような問題を有効に解決し、高い除染効果
を有するとともに、除染工程に際して作業性の良い化学
除染剤を提供することを目的とするものである。It is an object of the present invention to effectively solve such problems and to provide a chemical decontamination reagent having a high decontamination effect and good workability in the decontamination step.
「課題を解決するための手段」 本発明の化学除染剤は、放射性のクラッドを除去するた
めの化学除染剤であって、スルファミン酸およびシュウ
酸を配合してなることを特徴とする。"Means for Solving the Problem" The chemical decontamination reagent of the present invention is a chemical decontamination reagent for removing a radioactive clad, and is characterized by being mixed with sulfamic acid and oxalic acid.
本発明の化学除染剤は、スルファミン酸およびシュウ酸
を主剤とし、これらを水に溶解した液状のものとして、
原子炉等の一次系配管、機器等の放射線量を低減するた
めに使用される。The chemical decontamination reagent of the present invention is mainly composed of sulfamic acid and oxalic acid, and these are dissolved in water to form a liquid,
It is used to reduce the radiation dose to primary system piping and equipment such as nuclear reactors.
放射性のクラッドとは、配管、機器等の表面に付着した
放射性の付着物であって、60Co、54Mn、134Csやこれら
の放射性金属酸化物等を含む。The radioactive clad is a radioactive deposit adhered to the surface of piping, equipment, etc., and includes 60 Co, 54 Mn, 134 Cs and radioactive metal oxides thereof.
主剤となるスルファミン酸およびシュウ酸は、その合計
が通常1.0〜20重量％程度となるよう水に溶解されて配
合されるものであり、例えば廃材処理除染のごとくに高
い除染効果を必要とするときには10〜15（20）重量％程
度の高濃度に、また共用除染のごとく比較的低効果の除
染で良いときには1.0〜3.0重量％程度に調整されるもの
である。スルファミン酸とシュウ酸との重量比は、被除
染物に応じて適宜調製されるが、例えばスルファミン
酸：シュウ酸＝2:1の比が好適に採用される。Sulfamic acid and oxalic acid, which are the main ingredients, are dissolved in water so that the total amount thereof is usually about 1.0 to 20% by weight, and they are required to have a high decontamination effect such as decontamination of waste materials. The concentration is adjusted to a high concentration of about 10 to 15 (20)% by weight, and is adjusted to about 1.0 to 3.0% by weight when decontamination with relatively low effects such as common decontamination is sufficient. The weight ratio of sulfamic acid and oxalic acid is appropriately adjusted according to the material to be decontaminated, but for example, a ratio of sulfamic acid: oxalic acid = 2: 1 is preferably adopted.
また、スルファミン酸およびシュウ酸の主剤の他に、助
剤としてヒドロキシル酢酸、Ｌ−アスコルビン酸なども
適宜配合され、さらには炭素鋼等の腐食性材料からなる
配管等を除染する場合には、インヒビター（抑制剤）が
添加される。Further, in addition to the main agents of sulfamic acid and oxalic acid, hydroxyl acetic acid, L-ascorbic acid, etc. are appropriately blended as an auxiliary agent, and when decontaminating a pipe or the like made of a corrosive material such as carbon steel, An inhibitor is added.
このような化学除染剤にあっては、沸騰水型原子炉の一
次系配管に付着したクラッドに対して優れた除染効果を
示し、よって共用除染や廃材処理除染に好適に使用する
ことができる。また、この化学除染剤では、スルファミ
ン酸およびシュウ酸の混合物が常温の水に対し20重量％
程度の溶解度を有することから、溶液作製あるいはその
濃度調製などが容易となり、作業性に著しく向上する。
さらに、この化学除染剤にあっては、80〜90℃程度の雰
囲気温度で十分な除染効果を示すとともに、短時間で所
望する除染度を得ることができる。Such a chemical decontamination agent shows an excellent decontamination effect on the clad adhering to the primary system piping of a boiling water reactor, and is therefore suitably used for common decontamination and waste material treatment decontamination. be able to. With this chemical decontamination reagent, the mixture of sulfamic acid and oxalic acid is 20% by weight in water at room temperature.
Since it has a certain degree of solubility, it becomes easy to prepare a solution or adjust its concentration, and the workability is significantly improved.
Furthermore, this chemical decontaminating agent exhibits a sufficient decontaminating effect at an ambient temperature of about 80 to 90 ° C. and can obtain a desired decontaminating degree in a short time.
「実施例」 以下、実施例に基づいて本発明の化学除染剤を詳しく説
明する。"Example" Hereinafter, the chemical decontamination reagent of the present invention will be described in detail based on examples.
沸騰水型原子炉の炉水再循環系配管内面に付着するクラ
ッドを想定して模擬クラッドを作製し、これを本発明の
３種の化学除染剤で除染してその効果を調べ、その結果
を第１表に示した。なお、比較のため従来のクエン酸と
シュウ酸とを配合してなる化学除染剤を用い、同様にし
て模擬クラッドの除染を行い、その結果も合わせて第１
表に示した。A simulated clad was prepared assuming a clad adhering to the inner surface of the reactor water recirculation system pipe of a boiling water reactor, and the effect was investigated by decontaminating the simulated clad with the three types of chemical decontaminating agents of the present invention. The results are shown in Table 1. For comparison, a conventional chemical decontaminating agent prepared by blending citric acid and oxalic acid was used to decontaminate the simulated clad in the same manner.
Shown in the table.
なお、第１表中の本発明品A,B,Cには、それぞれ以下に
示す配合のものを用いた。また、比較品には、クエン酸
とシュウ酸との混合物を高温水に溶解した後冷却し、過
飽和状態（約0.2重量％）にしたものを便宜上用いた。
ここで、この比較品に配合される前記化合物は、常温で
はその溶解度が低く、水に対して0.1重量％以下程度に
しかならないことから、実際の使用にあたっては、例え
ば使用温度を100℃以上にする必要があり、またそのと
きのクラッドを完全に除去するまでの時間も表中に示し
た数値より長くなることが推定される。 The products A, B and C of the present invention shown in Table 1 had the following formulations. As a comparative product, a mixture of citric acid and oxalic acid was dissolved in high temperature water and then cooled to a supersaturated state (about 0.2% by weight), which was used for convenience.
Here, since the solubility of the compound compounded in this comparative product is low at room temperature and is only about 0.1% by weight or less with respect to water, in actual use, for example, the operating temperature should be 100 ° C or higher. It is estimated that the time required to completely remove the clad at that time is longer than the values shown in the table.
発明品A. スルファミン酸 ； 5重量％ シュウ酸 ； 1重量％ 水 ； 94重量％ 発明品B. スルファミン酸 ； 10重量％ シュウ酸 ； 5重量％ 水 ； 85重量％ 発明品Ｃ スルファミン酸 ； 10 重量％ シュウ酸 ； 5 重量％ インヒビター ； 0.3重量％ 水 ； 84.7重量％ 第１表に示したように、本発明品A,B,Cは、いずれもク
ラッドを100％除去でき、化学除染剤として有効である
ことが確認された。また、いずれも90℃、すなわち100
℃未満の温度にて２〜６時間でクラッドを完全除去する
ことができ、比較品が12時間要するのに比べて著しく作
業性が改善されていることが確認された。即ち、スルフ
ァミン酸とシュウ酸とを必須成分として組み合わせた本
発明の化学除染剤は、クエン酸とシュウ酸とを組み合わ
せたものより、化学除染剤として作業性が著しく優れて
いることが分った。Invention A. Sulfamic acid; 5% by weight Oxalic acid; 1% by weight Water; 94% by weight Invention B. Sulfamic acid; 10% by weight Oxalic acid; 5% by weight Water; 85% by weight Invention C Sulfamic acid; 10% by weight % Oxalic acid; 5% by weight Inhibitors; 0.3% by weight Water; 84.7% by weight As shown in Table 1, each of the products A, B and C of the present invention is capable of removing 100% of the clad and is a chemical decontaminating agent. It was confirmed to be effective. In addition, both are 90 ℃, ie 100
It was confirmed that the clad could be completely removed in 2 to 6 hours at a temperature lower than 0 ° C, and the workability was remarkably improved as compared with the comparative product requiring 12 hours. That is, it can be seen that the chemical decontamination reagent of the present invention in which sulfamic acid and oxalic acid are combined as essential components has significantly better workability as a chemical decontamination reagent than those in which citric acid and oxalic acid are combined. It was.
また、発明品Ｃは、インヒビターを添加したことによ
り、発明品Ｂに比較してクラッドを完全除去までの時間
は若干長くなるものの、腐食率は向上するため、炭素鋼
など腐食性材料に好適であることが確認された。Inventive product C has a slightly longer time until the clad is completely removed as compared with the inventive product B due to the addition of the inhibitor, but the corrosion rate is improved, so that it is suitable for corrosive materials such as carbon steel. It was confirmed that there is.
「発明の効果」 以上説明したように、この発明の化学除染剤は、スルフ
ァミン酸およびシュウ酸を配合してなるものである。ス
ルファミン酸とシュウ酸とを必須成分とするこの化学除
染剤にあっては、沸騰水型原子炉や加圧水型原子炉等の
一次系配管等に付着したクラッドに対して優れた除染効
果を示し、よって共用除染や廃材処理除染に好適に使用
することができる。また、この化学除染剤では、スルフ
ァミン酸およびシュウ酸の混合物が常温の水に対しても
20重量％程度の溶解度を有することから、使用現場にて
簡便に溶液作製あるいはその濃度調製などができ、従来
例として説明したクエン酸とシュウ酸とを主剤とする除
染剤と比較して作業性が著しく向上する。さらに、この
化学除染剤にあっては、80〜90℃程度の雰囲気温度で十
分な除染効果を示すとともに、この雰囲気温度にて短時
間で所望する除染度を得ることができ、よって作業効率
を向上せしめることができる。"Effects of the Invention" As described above, the chemical decontamination reagent of the present invention contains sulfamic acid and oxalic acid. With this chemical decontamination reagent that contains sulfamic acid and oxalic acid as essential components, it is possible to obtain an excellent decontamination effect on the clad adhered to primary system piping such as boiling water reactors and pressurized water reactors. Therefore, it can be suitably used for common decontamination and waste material treatment decontamination. Also, with this chemical decontamination reagent, a mixture of sulfamic acid and oxalic acid can be used in water at room temperature.
Since it has a solubility of about 20% by weight, it is possible to easily prepare a solution or adjust its concentration at the site of use, and work in comparison with the decontaminating agent mainly composed of citric acid and oxalic acid described as a conventional example. Significantly improved. Furthermore, with this chemical decontamination reagent, while exhibiting a sufficient decontamination effect at an ambient temperature of about 80 to 90 ° C., it is possible to obtain a desired decontamination degree in a short time at this ambient temperature. Work efficiency can be improved.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭59−185902（ＪＰ，Ａ) 特公 昭46−34883（ＪＰ，Ｂ１) 特公 昭43−11363（ＪＰ，Ｂ１) 特公 昭45−13681（ＪＰ，Ｂ１) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 59-185902 (JP, A) JP 46-34883 (JP, B1) JP 43-11363 (JP, B1) JP 45- 13681 (JP, B1)
Claims (1)
染剤であって、スルファミン酸およびシュウ酸を配合し
てなることを特徴とする化学除染剤。1. A chemical decontamination agent for removing a radioactive clad, which is characterized by being mixed with sulfamic acid and oxalic acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63068837A JPH07119833B2 (en) | 1988-03-23 | 1988-03-23 | Chemical decontamination agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63068837A JPH07119833B2 (en) | 1988-03-23 | 1988-03-23 | Chemical decontamination agent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01242792A JPH01242792A (en) | 1989-09-27 |
| JPH07119833B2 true JPH07119833B2 (en) | 1995-12-20 |
Family
ID=13385207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63068837A Expired - Lifetime JPH07119833B2 (en) | 1988-03-23 | 1988-03-23 | Chemical decontamination agent |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07119833B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6973154B2 (en) | 1998-09-29 | 2005-12-06 | Hitachi, Ltd. | Method of chemical decontamination and system therefor |
| JP4020512B2 (en) | 1998-09-29 | 2007-12-12 | 株式会社日立製作所 | Chemical decontamination method and apparatus |
| JP5766471B2 (en) * | 2011-03-07 | 2015-08-19 | 三菱重工業株式会社 | Radioactive waste decontamination method |
| CN112458466B (en) * | 2020-11-07 | 2022-04-15 | 西安热工研究院有限公司 | Chemical cleaning agent for condenser of in-service thermal power generating unit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59185902A (en) * | 1983-04-06 | 1984-10-22 | 石川島播磨重工業株式会社 | Pickling method for boiler evaporation tubes |
-
1988
- 1988-03-23 JP JP63068837A patent/JPH07119833B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01242792A (en) | 1989-09-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0138289A1 (en) | Improvements in or relating to the decontamination of metal surfaces in nuclear power reactors | |
| US3013909A (en) | Method of chemical decontamination of stainless steel nuclear facilities | |
| EP0174317A1 (en) | Decontamination of pressurized water reactors. | |
| GB2044982A (en) | Chemical decontamination of reactor parts | |
| JPH07119833B2 (en) | Chemical decontamination agent | |
| EP0164988B1 (en) | Method of decontaminating metal surfaces | |
| CN112657931B (en) | Method for cleaning lead-bismuth alloy on spent fuel | |
| JPH0119473B2 (en) | ||
| US5093072A (en) | Process for the radioactive decontamination of metal surfaces, particularly portions of primary circuits of water-cooled nuclear reactors | |
| JP3322771B2 (en) | Chemical polishing liquid for metal and chemical polishing method | |
| EP0137002A1 (en) | Decontamination of pressurized water reactors | |
| JP3069787B2 (en) | Method for suppressing adhesion of radioactive corrosion products to the surface of primary cooling water piping in nuclear power plants | |
| JP2015152562A (en) | chemical decontamination method | |
| JPH05255874A (en) | Pickling accelerator, pickling solution composition containing pickling accelerator, and method for promoting pickling of metal using the same | |
| JP2508170B2 (en) | Surface treatment method for reactor piping | |
| JPH0699193A (en) | Chemical decontamination | |
| JPS605888A (en) | Chemical washing method of iron oxide scale | |
| JP2002542458A (en) | A method for controlling zinc addition to a power reactor. | |
| JP2960974B2 (en) | Chemical cleaning method for oil piping | |
| CN113088856A (en) | Deep eutectic solvent hot galvanizing additive and preparation method and application thereof | |
| JP4316100B2 (en) | Cleaning method for nuclear power plant | |
| JPS59126996A (en) | Nuclear plant manufacturing method | |
| JP2722367B2 (en) | Cleaning agent and cleaning method for nickel plated surface | |
| JPS56133474A (en) | Apparatus made of tantalum and usable for hot sulfuric acid and preventing method for corrosion and hydrogen embrittlement of said apparatus | |
| Choi et al. | Performance of foam decontamination for fixed radioactive contamination |