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軽水炉圧力容器用鋼材の中性子照射脆化

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川崎製鉄技報 KAWASAKI STEEL GIHO

Vol.19 (1987) No.3

軽水炉圧力容器用鋼材の中性子照射脆化

Embrittlement of Steel Plates and Forgings and Their Weldments by Neutron Irradiation

中野 善文(Yoshifumi Nakano) 狩野 征明(Seimei Karino) 江島 彬夫(Akio Ejima)

要旨 : 軽水炉圧力容器用極厚鋼板と鍛鋼およびそれらの溶接継手について,中性子照射による材 質の変化を引張試験,シャルビー衝撃試験およびコンパクト試験片を用いた静的破壊靱性 試験により,定量的に評価した。その結果,共試材の照射脆化感受性が低いこと,規格範囲 内でのNi 含有量の増加は照射脆化感受性に影響を与えないこと,静的破壊靱性値 K(J IC) =100MPa√m遷移温度とシャルビー衝撃試験による 41J 遷移温度の中性子照射による移 行量が同じであることが明らかになった。 Synopsis :

The change in mechanical properties of heavy section steel plates, forgings, and their welded joints for light water reactor pressure vessels, induced by neutron irradiation, is evaluated by tensile tests, Charpy impact tests, and static fracture toughness tests using compact specimens. The study indicates that the materials tested have low sensitivity to neutron irradiation embrittlement, the increase in Ni content within the range allowed by ASTM specifications does not adversely affect the sensitivity to neutron irradiation embrittlement, and the transition temperature for static fracture toughness K(J IC) =100MPa √m agrees well with that for Charpy impact value of 41J.

(c)JFE Steel Corporation, 2003

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