Document: NUREG-0800
Document ID: 030a527a-e2e7-4d90-b34f-4662fb984153
Document Type: srp
Title: STRATEGIES AND GUIDANCE TO ADDRESS LOSS OF LARGE AREAS OF
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1331/ML13316B202.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.4
CFR Part: 
CFR Title: 

Content:
rect current (dc) power, describes the procedures to start non-alternating current (ac) powered pumps used for decay heat removal without dc power, and describes the guidelines to use a fire pumper to supply cooling water to the reactor core—for power 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. 19. Compartmentalization The reviewer should verify that the applicant describes the procedures to be used for doing an analysis or walk down of the plant with the primary consideration of limiting accelerant fluid flow. An analysis or walk down of target areas should be performed with a LOLA event in mind and the results should 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 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. 20. SFP Mitigative Measures The reviewer should verify that the applicant describes the orientation of spent fuel in the SFP. Spent fuel should be put in a 1 x 4 repeating pattern, as described in NRC (2005).