Document: NUREG-0800
Document ID: 164d26ee-2125-481e-9fae-fb7b05365716
Document Type: srp
Title: RESIDUAL HEAT REMOVAL (RHR) SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340635.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.7
CFR Part: 
CFR Title: 

Content:
uired if It can be shown that correction for single failure by manual actions inside or outside of containment or return to hot standby until manual actions (or repairs) are found to be acceptable for the individual plant. t" Z4c.I t:J c Heat removal and RCS circulation during cooldown to cold shutdown (Note: Need SG cooling to main- tain RCS circulation even after RHR In operation when under natural circulation Isteam dump valves].) Depressurization (Pressurizer auxiliary spray or power- operated relief valves). Provide safety-grade dump valves, operators, and power supply, etc. so that manual action should not be required after SSE except to meet single failure. Provide upgrading and additional valves to ensure operation of aux- iliary pressurizer spray using only safety-grade subsystem meeting single failure. Possible alternative may involve using pressurizer power- operated relief valves which have been upgraded. Meet SSE and single failure without manual operation inside containment. Compliance required. Compliance will not be required if a) dependence on manual actions inside containment after SSE or single failure or b) remaining at hot standby until manual actions or repairs are complete are found to be acceptable for the individual plant. TABLE 1. POSSIBLE SOLUTION FOR FULL COMPLIANCE WITH BTP RSB 5-1 AND RECOHHENDED IHPLEHENTATION FOR CLASS 2 PLANTS Design Requirements of BTP RSB 5-1 Process and [System or Component] Boration for cold shutdown [CVCS and boron sampling]. Possible Solution for Full Compliance Provide procedure and upgrading where necessary such that boration to cold shutdown concentration meets the requirements of I. Solution could range from (1) upgrading and adding valves to have both letdown and charg- ing paths safety grade and meet single failure to (2) use of backup procedures Involving less cost. For example, bor- ation without letdown may be acceptable and eliminate need for upgrading let- down path. Use of ECCS for injection of