Document: NUREG-0800
Document ID: 80fe9eee-2d6e-4a7e-b7dd-ec23aab2d39f
Document Type: srp
Title: STRATEGIES AND GUIDANCE TO ADDRESS LOSS OF LARGE AREAS OF
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1211/ML121110138.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.4
CFR Part: 
CFR Title: 

Content:
not used during normal plant operation, and therefore, operators were not familiar with its location. Staff Position Applicants for COLs or operating licenses should establish measures to ensure that personnel responsible for implementing mitigation strategies following a LOLA event can locate the equipment needed to implement these strategies in a timely manner during an emergency. Labeling or tagging all applicable equipment with distinctive and reflective tags is an acceptable measure. 10. NRC inspectors noted many instances where inadequacies in procedures, limited training or oversights in engineering analyses, resulted in the plant operations staff being unable to successfully perform a walkthrough of a strategy. In one case, operators were unable to figure out which hoses should be used and where they should be connected. At several sites, the procedure did not instruct the removal of existing nozzles as assumed by the engineering flow calculation. These types of inadequacies could have been identified if the licensee had performed a thorough validation of each strategy. Staff Position Applicants for COLs or operating licenses should include a commitment for the licensee to verify the adequacy of the procedures, training and engineering bases for each mitigating strategy by performing a walkthrough or other type of exercise of the strategy. A walkthrough should include all steps of the procedure, either by actual performance or by simulation where considerations of personnel safety, operational restrictions, technical specifications, or other license conditions would prohibit the actual performance of the step. 11. During implementation of mitigation strategies at licensed power reactor facilities, many licensees did not understand that two external SFP spray strategies are required per NEI 06-12. One is “local spray” from the area surrounding the SFP and the other is “elevated spray” from other locations, such as from the ground or surrounding