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Title: Analysis of pin removal experiments conducted in an SCWR-like test lattice

Abstract

A comprehensive program of integral experiments, largely based on the measurement of reaction rate distributions, was carried out recently on an SCWR-like fuel lattice in the central test zone of the PROTEUS zero-power research reactor at the Paul Scherrer Inst. in Switzerland. The present paper reports on the analysis of a complementary set of measurements, in which the reactivity effects of removing individual pins from the unperturbed, heterogeneously moderated reference lattice were investigated. It has been found that the detailed Monte Carlo modeling of the whole reactor using MCNPX is able - as in the case of the reaction rate distributions - to reproduce the experimental results for the pin removal worths within the achievable statistical accuracy. A comparison of reduced-geometry calculations between MCNPX and the deterministic LWR assembly code CASMO-4E has revealed certain discrepancies. On the basis of a reactivity decomposition analysis of the differences between the codes, it has been suggested that these could be due to CASMO-4E deficiencies in calculating the effect, upon pin removal, of the extra moderation in the neighboring fuel pins. (authors)

Authors:
 [1];  [2];  [1];  [2];  [1];  [3];  [1]
  1. Paul Scherrer Institue, CH-5232 Villigen PSI (Switzerland)
  2. (Switzerland)
  3. (United States)
Publication Date:
Research Org.:
American Nuclear Society, Inc., 555 N. Kensington Avenue, La Grange Park, Illinois 60526 (United States)
OSTI Identifier:
22105833
Resource Type:
Conference
Resource Relation:
Conference: PHYSOR 2012: Conference on Advances in Reactor Physics - Linking Research, Industry, and Education, Knoxville, TN (United States), 15-20 Apr 2012; Other Information: Country of input: France; 12 refs.
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; DECOMPOSITION; FUEL PINS; GEOMETRY; MONTE CARLO METHOD; REACTION KINETICS; REACTIVITY; RESEARCH REACTORS; SWITZERLAND; WATER COOLED REACTORS; ZERO POWER REACTORS

Citation Formats

Chawla, R., Swiss Federal Inst. of Technology EPFL, CH-1015 Lausanne, Raetz, D., Resun AG, CH-5001 Aarau, Jordan, K. A., Univ. of Florida, Gainesville, FL, and Perret, G. Analysis of pin removal experiments conducted in an SCWR-like test lattice. United States: N. p., 2012. Web.
Chawla, R., Swiss Federal Inst. of Technology EPFL, CH-1015 Lausanne, Raetz, D., Resun AG, CH-5001 Aarau, Jordan, K. A., Univ. of Florida, Gainesville, FL, & Perret, G. Analysis of pin removal experiments conducted in an SCWR-like test lattice. United States.
Chawla, R., Swiss Federal Inst. of Technology EPFL, CH-1015 Lausanne, Raetz, D., Resun AG, CH-5001 Aarau, Jordan, K. A., Univ. of Florida, Gainesville, FL, and Perret, G. Sun . "Analysis of pin removal experiments conducted in an SCWR-like test lattice". United States.
@article{osti_22105833,
title = {Analysis of pin removal experiments conducted in an SCWR-like test lattice},
author = {Chawla, R. and Swiss Federal Inst. of Technology EPFL, CH-1015 Lausanne and Raetz, D. and Resun AG, CH-5001 Aarau and Jordan, K. A. and Univ. of Florida, Gainesville, FL and Perret, G.},
abstractNote = {A comprehensive program of integral experiments, largely based on the measurement of reaction rate distributions, was carried out recently on an SCWR-like fuel lattice in the central test zone of the PROTEUS zero-power research reactor at the Paul Scherrer Inst. in Switzerland. The present paper reports on the analysis of a complementary set of measurements, in which the reactivity effects of removing individual pins from the unperturbed, heterogeneously moderated reference lattice were investigated. It has been found that the detailed Monte Carlo modeling of the whole reactor using MCNPX is able - as in the case of the reaction rate distributions - to reproduce the experimental results for the pin removal worths within the achievable statistical accuracy. A comparison of reduced-geometry calculations between MCNPX and the deterministic LWR assembly code CASMO-4E has revealed certain discrepancies. On the basis of a reactivity decomposition analysis of the differences between the codes, it has been suggested that these could be due to CASMO-4E deficiencies in calculating the effect, upon pin removal, of the extra moderation in the neighboring fuel pins. (authors)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {7}
}

Conference:
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