Engineering Version of Local Approach to Fracture and its Application\nfor RPV Lifetime Prediction

0509794 - ÚFM 2024 RIV CH eng C - Conference Paper (international conference)
Kotrechko, S. - Zimina, G. - Revka, V. - Dlouhý, Ivo
Engineering Version of Local Approach to Fracture and its Application
for RPV Lifetime Prediction.
New Methods of Damage and Failure Analysis of Structural Parts. Zurich: Trans Tech Publication, 2019 - (Strnadel, B.), s. 15-20. Key Engineering Materials, 810. ISBN 978-3-0357-1447-0. ISSN 1013-9826.
[New Methods of Damage and Failure Analysis of Structural Parts. Ostrava (CZ), 10.09.2018-14.09.2018]
Institutional support: RVO:68081723
Keywords : RPV integrity * radiation embrittlement * Local approach to fracture * RPV lifetime
OECD category: Mechanical engineering
https://www.scientific.net/KEM.810.15

Theoretical basis of the simplified (engineering) version of Local Approach (LA) to
fracture is summarized, and the possibility of using this version to predict the lifetime of RPV steels
is demonstrated. The concept of “effective” volume, fV , within which stresses and strains are
uniformly distributed, but the magnitude of the probability of cleavage initiation are equal to their
real values at given value of IC K , underlies the proposed engineering version of LA. A function
was selected to describe the temperature dependence of local cleavage stress, and a calibration
procedure was proposed for determining the constants in this dependence from the results of tests of
surveillance specimens. For weld metal of WWER-1000 reactors the dependences of brittle strength
on fluence were obtained, and the maximum permissible fluence values were determined. It is
shown that in addition to the radiation hardening, the radiation-induced reduction in the level of
brittle strength, MC R , has a significant effect on the radiation service life of reactor pressure vessel
steel.
Permanent Link: http://hdl.handle.net/11104/0301469