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Title: Regulatory Analysis of Reactivity Transients

This paper will describe modifications made to the FRAPCON-3 and FRAPTRAN fuel performance codes and models that impact reactivity initiated accident (RIA) analyses. The modified models include an upper bound empirical and best estimate release models for fast transients, and a revised fuel failure model that accounts for ductile and brittle failure. Because experimental data exists for discrete test conditions, the codes and models are used to interpolate and to some extent, to extrapolate these test conditions. An upper bound empirical model for release is used to establish new recommended release fractions for long-lived and short lived (radioactive) isotopes for RIA events in Regulatory Guide 1.183. A best estimate release model is used in FRAPTRAN 1.4 based on grain boundary gas concentrations from FRAPCON-3.4 to predict release for RIA events. Code and model predictions will be compared to failure and release data from RIA tests to demonstrate accuracy.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
1033849
Report Number(s):
PNNL-SA-66908
401001020; TRN: US1200615
DOE Contract Number:
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: OECD/NEA Workshop on Nuclear Fuel Behaviour during Reactivity Initiated Accidents, September 9-11, 2009, Paris, France
Publisher:
Nuclear Energy Agency, Issy-les-Moulineaux, France.
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; ACCIDENTS; ACCURACY; MODIFICATIONS; NUCLEAR FUELS; PERFORMANCE; REGULATORY GUIDES; TRANSIENTS