Affiliation:
1. Vinča Institute of Nuclear Sciences, Belgrade
Abstract
A numerical simulation of the radiological consequences of the RB reactor
reactivity excursion accident, which occurred on October 15, 1958, and an
estimation of the total doses received by the operators were run by the MCNP5
computer code. The simulation was carried out under the same assumptions as
those used in the 1960 IAEA-organized experimental simulation of the
accident: total fission energy of 80 MJ released in the accident and the
frozen positions of the operators. The time interval of exposure to high
doses received by the operators has been estimated. Data on the RB1/1958
reactor core relevant to the accident are given. A short summary of the
accident scenario has been updated. A 3-D model of the reactor room and the
RB reactor tank, with all the details of the core, created. For dose
determination, 3-D simplified, homogenised, sexless and faceless phantoms,
placed inside the reactor room, have been developed. The code was run for a
number of neutron histories which have given a dose rate uncertainty of less
than 2%. For the determination of radiation spectra escaping the reactor core
and radiation interaction in the tissue of the phantoms, the MCNP5 code was
run (in the KCODE option) and ?mode n p e?, with a 55-group neutron spectra,
35-group gamma ray spectra and a 10-group electron spectra. The doses were
determined by using the conversion of flux density (obtained by the F4 tally)
in the phantoms to doses using factors taken from ICRP-74 and from the
deposited energy of neutrons and gamma rays (obtained by the F6 tally) in the
phantoms? tissue. A rough estimation of the time moment when the odour of
ozone was sensed by the operators is estimated for the first time and given
in Appendix A.1. Calculated total absorbed and equivalent doses are compared
to the previously reported ones and an attempt to understand and explain the
reasons for the obtained differences has been made. A Root Cause Analysis of
the accident was done and, for the first time, a Cause and Effect diagram has
been created in Cause Mapping methodology and shown in Appendix A.2.
Publisher
National Library of Serbia
Subject
Safety, Risk, Reliability and Quality,Nuclear Energy and Engineering
Cited by
4 articles.
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