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論文
ウォータジェットピーニング施工材の実機環境下における残留応力緩和挙動 ― Ni 基合金に対する応力改善効果の長期安定性評価(第 1 報)―
著者:
于 麗娜,Lina YU,才田 一幸,Kazuyoshi SAIDA,西本 和俊,Kazutoshi NISHIMOTO,千種 直樹,Naoki CHIGUSA
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キーワードタグ:
In order to prevent primary water stress corrosion cracking (PWSCC), water jet peening (WJP) has been used on the welds of Ni-based alloys in pressurized water reactors (PWRs). However, the compressive residual stresses induced by WJP might be relaxed during the actual operation because of the elevated temperature environment. Therefore, the stability of the compressive residual stresses caused by WJP has been investigated during thermal aging. The result shows that the compressive residual stresses has...
英字タイトル:
Relaxation behavior of residual stress generated by water jet peening under operation temperature environment ― Evaluation for long term stability of residual stress improving treatment on Ni base alloy (report 1) ―
論文
原子力発電所における新保全技術としてのテンパービード工法の開発・適用
著者:
平野 伸朗,Shinro HIRANO,瀬良 健彦,Takehiko SERA,千種 直樹,Naoki CHIGUSA,沖村 浩司,Koji OKIMURA,西本 和俊,Kazutoshi NISHIMOTO
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Japanese government has recently addressed a policy to increase capacity factor of existing nuclear PPs to achieve the goal to decrease the emission of CO2. Numerous preventive measures have taken in nuclear power plants to minimize the risk of unexpected long shutdown. Newly developed mitigation measures or repair methods need to be qualified to satisfy regulatory standards, before it is implemented to nuclear power plants. The qualification process needs to comply regulatory standards though it may consum...
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R/D and implement of temper bead welding as newly developed maintenance technique in nuclear power plant
論文
原子力発電所における新溶接補修技術の 迅速な適用プロセスの検討
著者:
平野 伸朗,Shinro HIRANO,瀬良 健彦,Takehiko SERA,千種 直樹,Naoki CHIGUSA,于 麗娜,Lina YU,望月 正人,Masahito MOCHIZUKI,西本 和俊,Kazutoshi NISHIMOTO
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Abstract For the last couple of years, issue of defects in Alloy 600 weld lowered the capacity factor of nuclear power plants. To apply newly developed repair technique, like temper-bead welding that has not been prescribed in technical standards, it is necessary to evaluate its technical applicability to the requirement. In the previous cases, this process has been completed by issuance of no action letter for specific area and condition, utilizing implementation process, such as confirm testing by J...
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Study on implementing newly developed repair welding technique within a limited time frame for nuclear power plant
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論文
各種残留応力改善工法による効果の安定性に関する速度論的検討 ― Ni 基合金に対する応力改善効果の長期安定性評価(第2報)―
著者:
于 麗娜,Lina YU,才田 一幸,Kazuyoshi SAIDA,西本 和俊,Kazutoshi NISHIMOTO,千種 直樹,Naoki CHIGUSA
発刊日:
公開日:
キーワードタグ:
Stress corrosion cracking (SCC) is one of serious aging degradation problems for the Alloy 600 components of pressurized water reactors (PWRs). In order to prevent SCC, various methods such as water jet peening (WJP), laser peening (LP), surface polishing have been used to introduce compressive stresses at the surfaces of the PWR components. However, it has been reported that such compressive residual stress introduced by these methods might be relaxed during the practical operation, because of high te...
英字タイトル:
Kinetic analysis on the long term stability of the effect obtained by various residual stress improvement methods ― Evaluation for long term stability of residual stress improving treatment on Ni base alloy (report 2) ―
論文
溶接施工の乱れや手直し溶接が残留応力分布に及ぼす 変動程度の評価
著者:
瀬良 健彦,Takehiko SERA,平野 伸朗,Shinro HIRANO,千種 直樹,Naoki CHIGUSA,岡野 成威,Shigetaka OKANO,望月 正人,Masahito MOCHIZUKI,西本 和俊,Kazutoshi NISHIMOTO
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Abstract Various research projects have been conducted on the residual stress distribution in the pipe weld since it is important to evaluate SCC initiation, or to evaluate structural integrity. Our previous report noted the necessity of considering the influence of complicated residual stresses in multi-path weld joint in order to enhance the evaluation of long-term reliability of mitigated stress. This paper describes the evaluation result about the changes in residual stress caused by variations in...
英字タイトル:
Evaluation of varying extent on the residual stress distribution by effect of varied welding application and repair welding
論文
表層加工された低炭素ステンレス鋼溶接部における粒界すべり挙動に及ぼす残留応力および加工硬化の影響
著者:
森 裕章,Hiroaki MORI,勝山 仁哉,Jinya KATSUYAMA,望月 正人,Masahito MOCHIZUKI,西本 和俊,Kazutoshi NISHIMOTO
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To clarify the effects of residual stress and hardening on intergranular stress corrosion cracking (IGSCC) behavior in welds of low-carbon austenitic stainless steels with surface machining, residual stress and hardness were evaluated by 3-dimentional thermo elastic-plastic analysis and grain boundary sliding behavior was examined using a constant strain rate tensile test. It was revealed that grain boundary sliding occurred in the material at 561K by the tensile test with the numerically simulated t...
英字タイトル:
Effect of Residual Stress and Hardening on Grain Boundary Sliding in Welds of Low-carbon Stainless Steels with Surface Machining
論文
表面加工による残留応力改善の長期信頼性評価について
著者:
瀬良 健彦,Takehiko SERA,平野 伸朗,Shinro HIRANO,千種 直樹,Naoki CHIGUSA,岡野 成威,Shigetaka OKANO,才田 一幸,Kazuyoshi SAIDA,望月 正人,Masahito MOCHIZUKI,西本 和俊,Kazutoshi NISHIMOTO
発刊日:
公開日:
キーワードタグ:
Abstract Surface finishing methods, such as Water Jet Peening (WJP), have been applied to welds in some major components of nuclear power plants as a counter measure to Primary Water Stress Corrosion Cracking (PWSCC). In addition, the methods of surface finishing (buffing treatment) is being standardized, and thus the buffing treatment has been also recognized as the well-established method of improving stress. On the other hand, the long-term stability of peening techniques has been confirmed by acc...
英字タイトル:
Prediction method of long-term reliability in improving residual stresses by means of surface finishing