VVER-440 dosimetry and neutron spectrum benchmark.

摘要

Light Water Reactor (LWR) benchmark experiments performed in the United States under the Surveillance Dosimetry Improvement Program (SDIP), in general, reported measured reaction rates and not neutron flux spectrum. The VVER-440 benchmark experiments, using a combination of spherical hydrogen-filled proportional counters and a stilbene scintillator detector, were measurements that provided a direct verification of the transport neutron flux spectrum. The original SAILOR cross-section library from ENDF/B-IV were used, except that the iron, hydrogen, and oxygen values from ENDF/B-VI were inserted. A linear-least-squares analysis showed that the average difference between calculations and measurements below 10 MeV was (a) less than 6% at the surveillance position; (b) less than 5% at the pressure vessel (PV) inner surface; (c) less than 6% at 1/3 thickness into the PV (1/3 T); (d) less than 17% at 2/3 thickness into the PV (2/3 T); and (e) less than 24% at the PV outer surface.