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:
wer plant designs with injection capability—and to the SFP. These procedures should be written based on strategies developed using guidance in NEI 06-12, Revision 3. The plans and strategies for use of plant equipment during loss of power situations should be described in the application in a manner consistent with guidance in Appendix D of NEI 06-12, Revision 3 and subsequently implemented in the site guidelines by the licensee. 16. Compartmentalization (Item B.2.h) It is expected that an analysis or walk down of target areas will be performed with a LOLA event in mind and that the results will be documented. The primary consideration during this walk down is accelerant fluid flow. Any feasible compartmentalization enhancements should be implemented, as long as they do not impact other barrier programs (e.g., fire protection). Some 19.4-11 Revision 0 – May 2013 examples of enhancements may include sealing of floor plugs, expedited closure of floor plugs, enhanced fire door closing mechanisms, flood berms, and closing of tornado hatches. Enhancements may also be incorporated by design and this should be considered by applicants. The plans and strategies for an analysis or walk down of target areas should be described in the application in a manner consistent with guidance in Appendix D of NEI 06-12, Revision 3 and subsequently implemented in the site guidelines by the licensee. 17. SFP Mitigative Measures (Item B.2.m) For Item B.2.m.1, spent fuel should be put in a 1 x 4 repeating pattern, as described in Reference 1 or equivalent. Holders of COLs or operating licenses should pre-configure the SFP to enable direct placement of the expended assemblies from the vessel to the final distributed fuel pattern. The NRC staff has accepted alternate strategies for the timing to achieve the appropriate pattern at Part 50 facilities currently operating. This was done in consideration of the feasibility and practicality of such an operation in a pool filled with many cycles