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Title: Main results of Phenix final core physics tests

Abstract

The French sodium cooled fast reactor Phenix was shut down in 2009 after 35 years of operation. Before decommissioning a final set of tests was performed. This paper focuses on the following core physics tests: - measurement of control rod reactivity worth by several methods (sub-critical, critical, rod-drop methods), - control rod shifting during a full power operation state, - measurement of individual subassembly reactivity worth (fresh and burned fuel and fertile, sodium hole), - simulation of a gas bubble crossing the core. The control rod measurement test has shown some discrepancies between the different measurement methods, mainly for the rod bank worth. Considering a macroscopic parameter (the reactivity loss estimation), NSMM method seems to produce the better results. The control rod shifting test has highlighted the impact of the spatial effects generated by control rods movements over the power map. These spatial effects, known as shadowing effects, can modify up to 15% the individual control rod worth. The tests concerning individual subassembly worth and gas bubble have permit to evaluate the impact of local perturbations on the reactivity. All these tests can be considered as successful and the ability of the European neutronic code for fast reactors, ERANOS 2.2,more » to reproduce complex and atypical configuration has been demonstrated by good agreement between measured and computed values. (authors)« less

Authors:
; ; ;  [1]
  1. CEA, DEN, Cadarache, F-13108 Saint-Paul-lez-Durance (France)
Publication Date:
Research Org.:
American Nuclear Society, 555 North Kensington Avenue, La Grange Park, IL 60526 (United States)
OSTI Identifier:
22107776
Resource Type:
Conference
Resource Relation:
Conference: ICAPP '12: 2012 International Congress on Advances in Nuclear Power Plants, Chicago, IL (United States), 24-28 Jun 2012; Other Information: Country of input: France; 9 refs.; Related Information: In: Proceedings of the 2012 International Congress on Advances in Nuclear Power Plants - ICAPP '12| 2799 p.
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; BUBBLES; CONFIGURATION; CONTROL ELEMENTS; CONTROL ROD WORTHS; PERTURBATION THEORY; PHENIX REACTOR; REACTIVITY; REACTIVITY WORTHS; REACTOR CORES; REACTOR OPERATION; REACTOR PHYSICS; ROD DROP METHOD

Citation Formats

Pascal, V., Prulhiere, G., Vanier, M., and Fontaine, B. Main results of Phenix final core physics tests. United States: N. p., 2012. Web.
Pascal, V., Prulhiere, G., Vanier, M., & Fontaine, B. Main results of Phenix final core physics tests. United States.
Pascal, V., Prulhiere, G., Vanier, M., and Fontaine, B. Sun . "Main results of Phenix final core physics tests". United States.
@article{osti_22107776,
title = {Main results of Phenix final core physics tests},
author = {Pascal, V. and Prulhiere, G. and Vanier, M. and Fontaine, B.},
abstractNote = {The French sodium cooled fast reactor Phenix was shut down in 2009 after 35 years of operation. Before decommissioning a final set of tests was performed. This paper focuses on the following core physics tests: - measurement of control rod reactivity worth by several methods (sub-critical, critical, rod-drop methods), - control rod shifting during a full power operation state, - measurement of individual subassembly reactivity worth (fresh and burned fuel and fertile, sodium hole), - simulation of a gas bubble crossing the core. The control rod measurement test has shown some discrepancies between the different measurement methods, mainly for the rod bank worth. Considering a macroscopic parameter (the reactivity loss estimation), NSMM method seems to produce the better results. The control rod shifting test has highlighted the impact of the spatial effects generated by control rods movements over the power map. These spatial effects, known as shadowing effects, can modify up to 15% the individual control rod worth. The tests concerning individual subassembly worth and gas bubble have permit to evaluate the impact of local perturbations on the reactivity. All these tests can be considered as successful and the ability of the European neutronic code for fast reactors, ERANOS 2.2, to reproduce complex and atypical configuration has been demonstrated by good agreement between measured and computed values. (authors)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {7}
}

Conference:
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