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Title: Fuel relocation recovery implementation in Bison

Abstract

During the initial rise to power in light water reactors (LWR), thermal gradients within a pellet cause radial and axial cracks to form in the fuel. The effect of these cracks is to reduce the pellet-cladding gap and accelerate the interaction between the fuel and cladding. This process is known as fuel relocation and may also include contributions from pellet eccentricity and cladding ovality. Since the cladding experiences both elevated temperatures and high external pressure due to the coolant, the cladding typically creeps inward further reducing the pellet-cladding gap. Once the gap is closed and pellet cladding mechanical interaction (PCMI) begins, both the thermal and mechanical behavior of the fuel is affected. The compressive forces exerted on the fuel due to contact with the cladding cause the fractured fuel sections to move back toward their original position which is termed relocation recovery. A model for this phenomenon is implemented in the BISON fuel performance code and applied to a set of validation test cases. In conclusion, the predicted fuel rod diameter is compared to experimental measurements to evaluate the influence of relocation recovery over a range of operating conditions.

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. Idaho National Lab. (INL), Idaho Falls, ID (United States)
Publication Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1480510
Report Number(s):
INL/JOU-18-45000-Rev000
Journal ID: ISSN 0022-3115
Grant/Contract Number:  
AC07-05ID14517
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 511; Journal Issue: C; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 22 GENERAL STUDIES OF NUCLEAR REACTORS; 36 MATERIALS SCIENCE; 42 ENGINEERING; 97 MATHEMATICS AND COMPUTING; Fuel relocation; Fuel recovery; Cladding; Creep

Citation Formats

Zahoor, Mudasar, and Casagranda, Albert. Fuel relocation recovery implementation in Bison. United States: N. p., 2018. Web. doi:10.1016/j.jnucmat.2018.09.041.
Zahoor, Mudasar, & Casagranda, Albert. Fuel relocation recovery implementation in Bison. United States. doi:10.1016/j.jnucmat.2018.09.041.
Zahoor, Mudasar, and Casagranda, Albert. Tue . "Fuel relocation recovery implementation in Bison". United States. doi:10.1016/j.jnucmat.2018.09.041. https://www.osti.gov/servlets/purl/1480510.
@article{osti_1480510,
title = {Fuel relocation recovery implementation in Bison},
author = {Zahoor, Mudasar and Casagranda, Albert},
abstractNote = {During the initial rise to power in light water reactors (LWR), thermal gradients within a pellet cause radial and axial cracks to form in the fuel. The effect of these cracks is to reduce the pellet-cladding gap and accelerate the interaction between the fuel and cladding. This process is known as fuel relocation and may also include contributions from pellet eccentricity and cladding ovality. Since the cladding experiences both elevated temperatures and high external pressure due to the coolant, the cladding typically creeps inward further reducing the pellet-cladding gap. Once the gap is closed and pellet cladding mechanical interaction (PCMI) begins, both the thermal and mechanical behavior of the fuel is affected. The compressive forces exerted on the fuel due to contact with the cladding cause the fractured fuel sections to move back toward their original position which is termed relocation recovery. A model for this phenomenon is implemented in the BISON fuel performance code and applied to a set of validation test cases. In conclusion, the predicted fuel rod diameter is compared to experimental measurements to evaluate the influence of relocation recovery over a range of operating conditions.},
doi = {10.1016/j.jnucmat.2018.09.041},
journal = {Journal of Nuclear Materials},
number = C,
volume = 511,
place = {United States},
year = {2018},
month = {9}
}

Journal Article:
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