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Title: Irradiation Experiment Conceptual Design Parameters for NBSR Fuel Conversion

It has been proposed to convert the National Institute of Standards and Technology (NIST) research reactor, known as the NBSR, from high-enriched uranium (HEU) fuel to low-Enriched uranium (LEU) fuel. The motivation to convert the NBSR to LEU fuel is to reduce the risk of proliferation of special nuclear material. This report is a compilation of relevant information from recent studies related to the proposed conversion using a metal alloy of LEU with 10 w/o molybdenum. The objective is to inform the design of the mini-plate and full-size-Plate irradiation experiments that are being planned. This report provides relevant dimensions of the fuel elements, and the following parameters at steady state: average and maximum fission rate density and fission density, fuel temperature distribution for the plate with maximum local temperature, and two-dimensional heat flux profiles of fuel plates with high power densities. The latter profiles are given for plates in both the inner and outer core zones and for cores with both fresh and depleted shim arms (reactivity control devices). A summary of the methodology to obtain these results is presented. Fuel element tolerance assumptions and hot channel factors used in the safety analysis are also given.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Nuclear Science and Technology Dept.
Publication Date:
OSTI Identifier:
1149073
Report Number(s):
BNL--99897-2013-IR-R1
R&D Project: 10608; NN9002000; TRN: US1500106
DOE Contract Number:
AC02-98CH10886
Resource Type:
Technical Report
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); National Inst. of Standards and Technology
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; SLIGHTLY ENRICHED URANIUM; MOLYBDENUM ALLOYS; URANIUM BASE ALLOYS; FUEL PLATES; FISSION; CONVERSION; DESIGN; HOT CHANNEL FACTOR; IRRADIATION; HEAT FLUX; SAFETY ANALYSIS; STEADY-STATE CONDITIONS; TEMPERATURE DISTRIBUTION; TWO-DIMENSIONAL CALCULATIONS; REACTIVITY; TOLERANCE; NBSR REACTOR; DIMENSIONS; SHIM RODS; REACTOR KINETICS NIST; LEU; HEU; irradiation