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Zarazovski, M.*; Pistra, V.*; Lauerova, D.*; Obermeier, F.*; Mora, D.*; Dubyk, Y.*; Bolinder, T.*; Cueto-Felgueroso, C.*; Szavai, S.*; Dudra, J.*; et al.
Proceedings of ASME 2022 Pressure Vessels and Piping Conference (PVP 2022) (Internet), 11 Pages, 2022/07
The APAL (Advanced Pressurized Thermal Shock (PTS) Analysis for Long-Term Operation (LTO)) project was launched in October 2020 for four years with funding from the European Union's HORIZON 2020 program. Within APAL, an extensive literature review was performed and experience with defining the state-of-the-art of the Warm Pre-Stress (WPS) effect, which has an impact on the reactor pressure vessel (RPV) brittle fracture margin in both deterministic and probabilistic terms, was collected. To gather the worldwide experience of the WPS approaches and models, a comprehensive questionnaire was developed followed by each APAL partner response. It mainly focused on the following aspects: collection of existing WPS approaches and models implemented in standards and rules for RPV brittle fracture assessment; identification of the WPS issues; collection and analysis of the existing experimental data. This work describes worldwide experience and best practice of the WPS and its application for the RPV integrity assessment. The paper's conclusions are also focused on the recommendations for dealing with WPS issues.
高見澤 悠; 飛田 徹; 岩田 景子; 勝山 仁哉; 西山 裕孝
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フェライト鋼における高温予荷重(WPS)効果について、再負荷時における破壊靭性値の上昇に関しては予荷重レベル、除荷レベルをパラメータとした予測モデルが幾つか提案されている。しかしながら、国内データに対するそれらのモデルの適用性については十分に検討されていない。各モデルの適用性を明らかにするため、国内の原子炉圧力容器鋼を用いたWPS試験を実施し、試験結果と各予測モデルの評価値を比較した。その結果、モデルによる予測値の試験データの包絡性、実測値との整合性を考慮した場合、決定論的評価では最も保守的な予測値を与えるACEモデル、確率論的評価ではNRI-modified Wallinモデルが適切であることを示した。