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AbstractAbstract
[en] The critical decay constant (B/A), delayed neutron fraction (B) and generation time (A) of the Minerve reactor were measured by the Paul Scherrer Institut (PSI) and the Commissariat a l'Energie Atomique (CEA) in September 2014 using the Feynman-alpha and Power Spectral Density neutron noise measurement techniques. Three slightly subcritical configuration were measured using two 1-g "2"3"5U fission chambers. This paper reports on the results obtained by PSI in the near critical configuration (-2g). The most reliable and precise results were obtained with the Cross-Power Spectral Density technique: B = 708.4±9.2 pcm, B/A = 79.0±0.6 s"-"1 and A 89.7±1.4 micros. Predictions of the same kinetic parameters were obtained with MCNP5-v1.6 and the JEFF-3.1 and ENDF/B-VII.1 nuclear data libraries. On average the predictions for B and B/A overestimate the experimental results by 5% and 11%, respectively. The discrepancy is suspected to come from either a corruption of the data or from the inadequacy of the point kinetic equations to interpret the measurements in the Minerve driven system. (authors)
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2015; 17 p; ANIMMA 2015: 4. International Conference on Advancements in Nuclear Instrumentation Measurement Methods and their Applications; Lisboa (Portugal); 20-24 Apr 2015; Available from the INIS Liaison Officer for France, see the 'INIS contacts' section of the INIS website for current contact and E-mail addresses: http://www.iaea.org/inis/Contacts/; Country of input: France; 25 Refs.
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ACTINIDE NUCLEI, ALPHA DECAY RADIOISOTOPES, BARYONS, COMPUTER CODES, ELEMENTARY PARTICLES, ENRICHED URANIUM REACTORS, EQUATIONS, EVEN-ODD NUCLEI, EXPERIMENTAL REACTORS, FERMIONS, FRENCH ORGANIZATIONS, FUNCTIONS, HADRONS, HEAVY NUCLEI, INTERNAL CONVERSION RADIOISOTOPES, IONIZATION CHAMBERS, ISOMERIC TRANSITION ISOTOPES, ISOTOPES, MEASURING INSTRUMENTS, MINUTES LIVING RADIOISOTOPES, NATIONAL ORGANIZATIONS, NEUTRON DETECTORS, NUCLEI, NUCLEONS, POOL TYPE REACTORS, RADIATION DETECTORS, RADIOISOTOPES, REACTORS, RESEARCH AND TEST REACTORS, RESEARCH REACTORS, SPECTRAL FUNCTIONS, SPONTANEOUS FISSION RADIOISOTOPES, THERMAL REACTORS, URANIUM ISOTOPES, WATER COOLED REACTORS, WATER MODERATED REACTORS, YEARS LIVING RADIOISOTOPES, ZERO POWER REACTORS
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