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Present status of in-pile IASCC growth tests at JMTR

JMTRにおける照射下き裂進展試験の現状

加治 芳行; 宇賀地 弘和; 中野 純一*; 松井 義典; 川又 一夫; 塚田 隆; 永田 暢秋*; 堂崎 浩二*; 瀧口 英樹*

Kaji, Yoshiyuki; Ugachi, Hirokazu; Nakano, Junichi*; Matsui, Yoshinori; Kawamata, Kazuo; Tsukada, Takashi; Nagata, Nobuaki*; Dozaki, Koji*; Takiguchi, Hideki*

照射誘起応力腐食割れ(IASCC)は、軽水炉のステンレス鋼製構造物の長期運転において、重要な課題の一つである。IASCCの研究分野では、照射下でのSCC試験を実施することは大変困難なため、おもに照射材を用いたPIEを実施している。したがって、照射下SCC試験の重要な技術として、負荷応力レベル,水化学,照射条件等の効果に関する情報を得るために試験技術の開発を行ってきた。本報告では、開発した種々の技術、特に試験片の荷重制御,き裂進展モニタリング技術などについて述べ、JMTRにおける照射済み材料を用いた照射下IASCC進展試験の現状についても述べる。

Irradiation assisted stress corrosion cracking (IASCC) is one of the critical concerns when stainless steel components have been in service in light water reactors (LWRs) for a long period. In the research field of IASCC, mainly PIEs for irradiated materials have been carried out, because there are many difficulties on SCC tests under neutron irradiation. Hence as a part of the key techniques for in-pile SCC tests, we have embarked on a development of the test technique to obtain information concerning effects of applied stress level, water chemistry, irradiation conditions, etc. In this paper, we describe the developed several techniques, especially control of loading on specimens, monitoring technique of crack propagation and so on, and the present status of in-pile IASCC growth tests using pre-irradiated materials at JMTR.

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