Document: NUREG-0800
Document ID: 243e1ce7-857c-48e4-9eb7-6125311da9be
Document Type: srp
Title: RESIDUAL HEAT REMOVAL (RHR) SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070437.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.7
CFR Part: 
CFR Title: 

Content:
to permit operation at hot shutdown for at least 4 hours, followed by 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. H. Implementation For the purposes of implementing the requirements for plant heat removal capability for compliance with this position, plants are divided into the following three classes: Class 1 - Full compliance with this position for all plants (custom or standard) for which CP or PDA applications that are docketed on or after January 1, 1978. See 179 Table 1 for possible solutions for full compliance. Class 2 - Partial implementation of this position for all plants (custom or standard) for which CP or PDA applications are docketed before January 1, 1978, and for which an OL issuance 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 back fitted for all operating reactors and all other plants (custom or standard) for which DRAFT Rev. 4 - April 1996 5.4.7-26 issuance of the OL is expected before January 1, 1979, will be based on the combined I&E and DOR review of related plant features for operating reactors. 5.4.7-27 DRAFT Rev. 4 - April 1996 TABLE 1. POSSIBLE SOLUTION FOR FULL COMPLIANCE WITH BTP RSB 5-1 AND RECOMMENDED IMPLEMENTATION FOR CLASS 2 PLANTS Design Requirements Process and [System or Component] Possible Solution for Full Compliance Recommended Implementation for of BTP RSB 5-1 Class 2 Plants (see Note 1) I. Functional Requirement for Taking Long-term cooling [RHR drop line] Provide double drop line (or valves in Compliance will not be required if it to Cold Shutdown parallel) to prevent single valve failure can be shown that correction for single a. Capability Using Only (Note: This requirement in conjunction outside