https://doi.org/10.1051/epjconf/201610602006
Uncertainties in the Fluence Determination in the Surveillance Samples of VVER-440
1 Helmholtz Zentrum Dresden-Rossendorf e.V., PF 510119, 01314 Dresden, Germany
2 SEC NRS, Malaya Krasnoselskaya ul, 2/8 bld.5, 107140 Moscow, Russia
a Corresponding author: j.konheiser@hzdr.de
Published online: 3 February 2016
The reactor pressure vessel (RPV) represents one of the most important safety components in a nuclear power plant. Therefore, surveillance specimen (SS) programs for the RPV material exist to deliver a reliable assessment of RPV residual lifetime. This report will present neutron fluence calculations for SS. These calculations were carried out by the codes TRAMO [1] and DORT [2]. This study was accompanied by ex-vessel neutron dosimetry experiments at Kola NPP. The main neutron activation monitoring reactions were 54Fe(n,p)54Mn and 58Ni(n,p)58Co. Good agreement was found between the deterministic and stochastic calculation results and between the calculations and the ex-vessel measurements. The different influences on the monitors were studied. In order to exclude the possible healing effects of the samples due to excessive temperatures, the heat release in the surveillance specimens was determined based on the calculated gamma fluences. Under comparatively realistic conditions, the heat increased by 6 K.
© Owned by the authors, published by EDP Sciences, 2016
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
