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:
ce 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 of containment or return to hot Safety Grade Systems with meeting effects of single failure standby until manual actions (or b. Capability with either only requirements involve increased number the individual plant. onsite or only offsite power of independent power supplies and and with single failure possibly more than four valves). (limited action outside CR to meet SF) c. Reasonable time for cooldown assuming most limiting SF and only offsite or only onsite power. from stopping RHR cooling function. failure by manual actions inside or for long-term cooling and isolation repairs) are found to be acceptable for Heat removal and RCS circulation Provide safety-grade dump valves, Compliance required. during cooldown to cold shutdown operators, and power supply, etc. so (Note: Need SG cooling to maintain that manual action should not be RCS circulation even after RHR in required after SSE except to meet operation when under natural single failure. circulation [steam dump valves].) Depressurization (Pressurizer auxiliary Provide upgrading and additional Compliance will not be required if a) spray or power-operated relief valves). valves to ensure operation of auxiliary dependence on manual actions inside pressurizer spray using only containment after SSE or single failure safety-grade subsystem meeting failure or b) remaining at hot standby until criteria. Possible alternative may manual actions or repairs are complete involve using pressurizer are found to be acceptable for the power-operated relief valves which individual plant. have been upgraded (see References 16, 24 and SRP Section 3.2.2). Meet 180 SSE and single failure without manual operation inside containment. TABLE 1. POSSIBLE SOLUTION FOR FULL COMPLIANCE WITH BTP RSB 5-1 AND RECOMMENDED IMPLEMENTATION FOR