Two-zone stratified wetwell model development and implementation for RELAP-7

Cavaluzzi, Jack; Andrs, David; Vierow Kirkland, Karen

doi:10.1016/j.anucene.2021.108592

Two-zone stratified wetwell model development and implementation for RELAP-7

Journal Article · Mon Aug 09 00:00:00 EDT 2021 · Annals of Nuclear Energy

DOI:https://doi.org/10.1016/j.anucene.2021.108592· OSTI ID:1903596

^[1]; ^[2]; Vierow Kirkland, Karen ^[3]

Texas A & M Univ., College Station, TX (United States); Idaho National Lab. (INL), Idaho Falls, ID (United States)
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Texas A & M Univ., College Station, TX (United States)

The Reactor Core Isolation Cooling (RCIC) system consists of a turbine, pump and wetwell and is used in many US Boiling Water Reactors (BWRs) as an important heat removal system. The wetwell is a major heat sink within containment. Experimental investigations have shown that thermal stratification may occur in the wetwell during RCIC operation. Current systems-level analysis codes lack stratified wetwell models. Here, this paper describes the development of a stratified wetwell model for the RELAP-7 code. This paper uses a simple two-zone model for the wetwell water that can capture thermal stratification. This model assumes that a buoyant plume transports heat and mass from the steam injection site to the upper water zone. The buoyant plume assumption requires that steam is injected at a low enough rate so it adds negligible momentum. Model validation against experimental data shows similar trends of temperature field development in the suppression pool.

Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC07-05ID14517; NE0008566

OSTI ID:: 1903596

Alternate ID(s):: OSTI ID: 1815242
OSTI ID: 23197297

Report Number(s):: INL/JOU-20-60621-Rev000

Journal Information:: Annals of Nuclear Energy, Journal Name: Annals of Nuclear Energy Vol. 164; ISSN 0306-4549

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
RCIC system
RELAP-7
pool thermal stratification
suppression pool
systems-level modeling
wetwell

Two-zone stratified wetwell model development and implementation for RELAP-7

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References (12)

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