SEDL / STP / STP1270-EB / STP16492S

Surveillance Programme for WWER-440/Type 213 Reactor Pressure Vessels- Standard Programme, Re-Evaluation of Results, Supplementary Programme

Brumovský, M
Managers and research scientists, Nuclear Research Institute Řež plc, Řež,

Novosad, P
Managers and research scientists, Nuclear Research Institute Řež plc, Řež,

Žd'árek, J
Managers and research scientists, Nuclear Research Institute Řež plc, Řež,

Pages: 7    Published: Jan 1996

Download this paper for $25 PDF (100K)          View License Agreement
Abstract

Irradiation embrittlement of the reactor pressure vessel beltline materials of WWER-440/Type 213 reactors is monitored by a material irradiation surveillance programme. Due to the high lead factor, the duration of the standard surveillance programme is only five years, after which no further surveillance samples remain in the reactor. The large variation and uncertaintity in neutron flux over the irradiated materials produce significant scatter in mechanical properties and necessitate a re-evaluation of results using gamma scanning, specimen reconstitution and recalculation. In order to provide information on the impact of changes in plant operation during later years a supplementary surveillance programme has been devised.