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<p>Reliable operation of Nuclear Power Plants (NPPs) requires ensuring the integrity of the reactor pressure vessel (RPV) in all operating conditions. RPV life assessment is based on calculations of brittle fracture resistance. The key RPV problem is metal degradation due to irradiation, which leads to embrittlement and reduced crack growth resistance. This process is monitored using surveillance specimens, which are kept in the reactor and periodically removed for testing. Traditionally, the determination of RPV crack growth resistance requires standard specimen testing, but the limited availability of irradiated material complicates this process. The use of miniature specimens is a&#xa0;relevant solution. New results were obtained for the fracture toughness testing of 15Kh2NMFA‑A steel using miniature C(T)0.16T specimens. It is shown that the test results allow predicting the reference temperature of the steel according to the Master Curve.</p>

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Determination of crack growth resistance characteristics of 15Kh2NMFA-A steel minispecimens

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • M. M. Zarazovskii,
  • K. M. Lukianenko,
  • Z. S. Yaskovets,
  • S. M. Shukayev,
  • M. P. Zemtsov

摘要

Reliable operation of Nuclear Power Plants (NPPs) requires ensuring the integrity of the reactor pressure vessel (RPV) in all operating conditions. RPV life assessment is based on calculations of brittle fracture resistance. The key RPV problem is metal degradation due to irradiation, which leads to embrittlement and reduced crack growth resistance. This process is monitored using surveillance specimens, which are kept in the reactor and periodically removed for testing. Traditionally, the determination of RPV crack growth resistance requires standard specimen testing, but the limited availability of irradiated material complicates this process. The use of miniature specimens is a relevant solution. New results were obtained for the fracture toughness testing of 15Kh2NMFA‑A steel using miniature C(T)0.16T specimens. It is shown that the test results allow predicting the reference temperature of the steel according to the Master Curve.