Document: NUREG-0800
Document ID: 5d88f9f1-c708-4a51-8593-a2aa484a15f3
Document Type: srp
Title: Revision 4 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0708/ML070850123.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5
CFR Part: 
CFR Title: 

Content:
ng event in the reactor vessel head and incorporate appropriate controls to address such an occurrence (Generic Letter 92-02). 7. Auxiliary Feedwater Supply The seismic Category I water supply for the auxiliary feedwater system for a PWR shall have sufficient inventory to permit operation at hot shutdown for at least 4 hours, followed by BTP 5-4-5 Revision 4 - March 2007 cooldown to the conditions permitting operation of the RHR system. The inventory needed for cooldown shall be based on the longest cooldown time needed with either only onsite or only offsite power available with an assumed single failure. 8. Implementation For the purposes of implementing the requirements for plant heat removal capability to comply with this position, plants are divided into the following three classes: Class 1 Full compliance with this position for all plant applications that are docketed on or after January 1, 1978. See Table 1 for possible solutions for full compliance. Class 2 Partial implementation of this position for all plants (custom or standard) for which construction permit or PDA applications are docketed before January 1, 1978, and for which issuance of an operating license is expected on or after January 1, 1979. See Table 1 for recommended implementation for Class 2 plants. Class 3 The extent to which the implementation guidance in Table 1 will be backfitted for all operating reactors and all other plants (custom or standard) for which issuance of the operating license occurred before January 1, 1979, will be based on the combined I&E and DOR review of related plant features for operating reactors. C. REFERENCES 1. 10 CFR Part 50, Appendix A, General Design Criterion 1, “Quality Standards and Records.” 2. 10 CFR Part 50, Appendix A, General Design Criterion 2, “Design Bases for Protection Against Natural Phenomena.” 3. 10 CFR Part 50, Appendix A, General Design Criterion 3, “Fire Protection.” 4. 10 CFR Part 50, Appendix A, General Design Criterion 4,