JP5450148B2 - 構造部材のき裂進展抑制方法 - Google Patents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Description
H2O2 + 2H+ + 2e− → 2H2O ……(2)
構造部材の電気的中性を保つために、き裂の先端部において、(3)式に示す対反応が生じる。この反応によって、構造部材に含まれる金属元素がイオン化して炉水に溶出するので、き裂が進展する。Mは構造部材に含まれる金属元素である。この金属元素のイオン化により、電子が放出される。
(3)式の反応がき裂の先端部で生じる理由は、き裂の先端部では酸化種の供給量が少ないために、構造部材からの金属元素イオンの炉水への溶出を抑制する作用を有する酸化皮膜の生成が少ないこと、並びに、き裂内の炉水中に硫酸等のアニオンが濃縮するためである。
生成した水素イオンは、き裂内からき裂外に向かって炉水中を拡散する。
Claims (6)
- 原子炉の運転が停止されている状態で前記原子炉の構造部材に生じているき裂内に電気めっきによりCr層を形成して前記Cr層により前記き裂を封止し、Ni層を、電気めっきにより、前記き裂を封止した前記Cr層及び前記Cr層と前記き裂の内面との接触面を覆って前記構造部材の表面に掛けて形成することを特徴とする構造部材のき裂進展抑制方法。
- 前記き裂内への前記Cr層の形成は、前記構造部材の、前記き裂が存在する部分の表面に、第1電極が挿入された吸収部材を接触させ、前記吸収部材にCrめっき液を供給し、前記吸収部材に浸透した前記Crめっき液を介して前記第1電極と前記構造部材の間に電流を流すことによって行われ、
前記Cr層の表面への前記Ni層の形成は、前記吸収部材を洗浄した後に、前記構造部材の、前記き裂が存在する部分の前記表面に接触した前記吸収部材にNiめっき液を供給し、前記吸収部材に浸透した前記Niめっき液を介して前記第1電極と前記構造部材の間に電流を流すことによって行われる請求項1に記載の構造部材のき裂進展抑制方法。 - 前記構造部材の前記表面に接触された前記吸収部材内に挿入された第2電極と前記構造部材間の電圧を電圧検出器で計測し、前記電圧検出器で計測された電圧に基づいて前記第2電極と前記構造部材間の前記電圧を設定電圧に調節する請求項2に記載の構造部材のき裂進展抑制方法。
- 前記吸収部材への前記めっき液の供給は液供給管を用いて行う請求項2または3に記載の構造部材のき裂進展抑制方法。
- 前記吸収部材の移動が走査装置によって行われる請求項2,3及び4のいずれか1項に記載の構造部材のき裂進展抑制方法。
- 前記電気めっきが、前記構造部材の表面に形成された不働態皮膜を除去した後に行われる請求項1に記載の構造部材のき裂進展抑制方法。
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JP6783585B2 (ja) * | 2015-08-24 | 2020-11-11 | 株式会社東芝 | 原子炉構造物の補修方法 |
JP6549006B2 (ja) * | 2015-09-25 | 2019-07-24 | 株式会社東芝 | 表面処理システム及び表面処理方法 |
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JP3221263B2 (ja) * | 1994-12-28 | 2001-10-22 | 株式会社日立製作所 | 応力腐食割れの補修装置 |
JP2000352597A (ja) * | 1999-06-10 | 2000-12-19 | Toshiba Corp | 原子力発電プラントおよびその運転方法 |
JP4067721B2 (ja) * | 1999-09-27 | 2008-03-26 | 株式会社東芝 | 沸騰水型原子力発電プラント |
JP2005148000A (ja) * | 2003-11-19 | 2005-06-09 | Hitachi Ltd | 応力腐食割れ抑制方法 |
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