SYMPOSIA PAPER Published: 01 January 1989

Neutron Embrittlement Surveillance Program at Krṡko Nuclear Power Plant


Presented are results of the testing of the first surveillance capsule of the Kṡsko Nuclear Power Plant. The plant is a 632-MWe two-loop pressurized water reactor (PWR). The pressure vessel is made of low-copper steel. The projected lifetime neutron exposure of the pressure vessel is 6 ∙ 1019 n/cm-2E > 1 MeV. The first surveillance capsule was irradiated to 1.75 effective full power year (EFPY). The neutron exposure of irradiated specimens was between 7.4 to 9.4 ∙ 1018 n/cm2 E > 1 MeV depending on specimen positions. Observed ▵RTNDT are higher than given by predictive formulas for all except base material in transverse direction. The ratio observed versus predicted for weld was found to be 2 and 5 in the case of Regulatory Guide 1.99, Revision 1 and Revision 2, respectively. Observed change in the upper shelf energy is of the order of a few percent and is hidden by the spread in measured values.

Author Information

Najzer, M
J. Stefan Institute, Ljubljana, Yugoslavia
Glumac, B
J. Stefan Institute, Ljubljana, Yugoslavia
Kodeli, I
J. Stefan Institute, Ljubljana, Yugoslavia
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Developed by Committee: E10
Pages: 83–90
DOI: 10.1520/STP10388S
ISBN-EB: 978-0-8031-5074-4
ISBN-13: 978-0-8031-1187-5