Document: NRC Regulatory Guide
Document ID: 6f0a99f2-d25a-44e3-b7f2-3286449a9752
Document Type: regulatory_guide
Title: Water Sources for Long-Term Recirculation Cooling Following a Loss-of-Coolant Accident (Rev. 5)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2126/ML21266A185.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.82
CFR Part: 
CFR Title: 

Content:
onfigurations. Currently operating BWR strainer designs are based on guidance from sources such as the Boiling Water Reactor Owners’ Group (BWROG) Utility Resolution Guide (URG), issued October 1998 (Ref. 19), the accompanying safety evaluation (SE) found in Volume 1 of the URG, and NUREG/CR-6224, “Parametric Study of the Potential for BWR ECCS Strainer Blockage Due to LOCA Generated Debris,” issued October 1995 (Ref. 20). For future DG-1385, Page 12 evaluations, BWR strainer designs should consider subsequent guidance developed during the resolution of GSI-191 and GL 2004-02, including chemical and downstream effects and strainer head loss and vortexing. For details, the reader should consult the recent NUREG-series publications, several industrial topical reports and their accompanying SEs, and other technical guidance listed in the reference section of this guide. During the PWR work on GSI-191, staff determined that some lessons learned from PWRs should be evaluated for application to BWRs. NUREG/CR-7011, “Evaluation of Treatment of Effects of Debris in Coolant on ECCS and CSS Performance in Pressurized Water Reactors and Boiling Water Reactors,” issued May 2010 (Ref. 21), documents these findings. The BWROG undertook a voluntary program to evaluate the differences that the NRC staff had identified as potentially significant. The NRC and the industry had numerous interactions on these topics. On November 20, 2017, the BWROG submitted a letter, “Final Resolution of Potential Issues Related to Emergency Core Cooling Systems (ECCS) Strainer Performance at Boiling Water Reactors” (Ref. 22), stating that it had finished evaluating the differences and had identified no safety concerns warranting further action. The NRC reviewed the BWROG letter and agreed that no further action was required. This was documented in the NRC letter entitled “Closure of Potential Issues Related to Emergency Core Cooling Systems Strainer Performance at Boiling Water