Protective systems: An application of regulatory guidance for ECCS sump performance

Ha Bui, Tatsuya Sakurahara, Wen Chi Cheng, Timothy Crook, Rodolfo Vaghetto, Martin Wortman, Zahra Mohaghegh, Seyed Reihani, Ernie Kee, Dominic Munoz, David Johnson, Wes Schulz, Fatma Yilmaz, Vera Moiseytseva

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The work described in this paper reports on the additional research and development conducted in support of the Risk-informed Over Deterministic (RoverD) approach to address the concerns raised in Generic Safety Issue 191 (GSI-191). In this work, a method is developed using a RELAP5-3D PWR model coupled with a MELCOR large, dry containment model to obtain conservative containment pressure estimates used together with conservative sump pool temperature estimates in order to comply with the regulatory guidance. The current regulatory guidance on Emergency Core Cooling System (ECCS) performance, "Revised Content Guide for Generic Letter 2004 02 Supplemental Responses, November 2007" (ADAMS Accession No. ML073110278), and Regulatory Guide 1.82, "Water Sources for Long Term Recirculation Cooling Following a Loss of Coolant Accident," is briefly reviewed as it applies to flashing in the ECCS pumping system. Because the guidance does not specify the method that should be used to comply with the conservative assumptions, an acceptable approach must be developed by the utility engineer.

Original languageEnglish (US)
Title of host publicationInternational Topical Meeting on Probabilistic Safety Assessment and Analysis, PSA 2017
PublisherAmerican Nuclear Society
Pages693-702
Number of pages10
ISBN (Electronic)9781510851801
StatePublished - 2017
Event2017 International Topical Meeting on Probabilistic Safety Assessment and Analysis, PSA 2017 - Pittsburgh, United States
Duration: Sep 24 2017Sep 28 2017

Publication series

NameInternational Topical Meeting on Probabilistic Safety Assessment and Analysis, PSA 2017
Volume2

Other

Other2017 International Topical Meeting on Probabilistic Safety Assessment and Analysis, PSA 2017
CountryUnited States
CityPittsburgh
Period9/24/179/28/17

Keywords

  • Defense in depth
  • Deterministic
  • Flashing
  • GSI-191
  • Generic Safety Issue
  • MELCOR
  • NPSH
  • Nuclear promise
  • Protective system
  • Regulation
  • Regulatory Guide 1.82
  • Relap5-3D
  • Risk-informed
  • Safety margin
  • Sump

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Statistics, Probability and Uncertainty
  • Statistics and Probability
  • Nuclear Energy and Engineering

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