Title of article :
Influence of the depth position on the neutron embrittlement of the VVER reactor pressure vessel steel 15Cr2MoV(A) consequences for the assessment of reactor safety
Author/Authors :
J. B?hmert، نويسنده , , F. Bergner، نويسنده , , M. Grosse، نويسنده , , H.-W. Viehrig، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 1995
Abstract :
The dependence of the mechanical properties on the depth position in the unirradiated state and after irradiation up to neutron fluences of approximately 5 × 1018 and 70 × 1018 cm−2 (E > 0.5 MeV) is tested on a forging made out of VVER 440 reactor pressure vessel (RPV) steel 15CrMoV. The near-surface position shows a higher strength and a lower transition temperature than the positions greater than 14 wall thickness. Irradiation does not change these differences in a significant manner. The testing of specimens from the 14 depth position within the surveillance programme, as normally laid down in the legal rules relating to nuclear power plants, results in a conservative safety assessment against brittle failure up to the EOL fluence. On taking into account fluence attenuation, the flux effect, etc., the toughness gradually increases from the inside to the outside of the wall after longer RPV operating times.
Journal title :
Nuclear Engineering and Design Eslah
Journal title :
Nuclear Engineering and Design Eslah