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:
so that manual action should not be required after SSE except to meet the single failure criterion. Compliance required. Depressurization (pressurizer auxiliary spray or PORVs). Provide upgrading and additional valves to ensure operation of auxiliary pressurizer spray using only safety-grade subsystem meeting failure criterion. Possible alternative may involve using pressurizer PORVs that have been upgraded (see Generic Letter 90-06, NUREG-1316, and SRP Section 3.2.2). Meet SSE and single failure criteria without manual operation inside containment. Compliance will not be required if (1) dependence on manual actions inside containment after an SSE or single failure or (2) 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 5-4 AND RECOMMENDED IMPLEMENTATION FOR CLASS 2 PLANTS Design Requirements of BTP 5-4 Process and [System or Component] Possible Solution for Full Compliance Recommended Implementation for Class 2 Plants (see Note 1) BTP 5-4-9 Revision 4 - March 2007 Boration for cold shutdown [CVCS and boron sampling] 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 charging paths at safety grade and meet the single failure criterion to (2) using backup procedures involving less cost. For example, boration without letdown may be acceptable and eliminate the need for upgrading the letdown path. Use of ECCS for injection of borated water may also be acceptable. Need surveillance of boron concentration (boronometer and/or sampling). Limited operator action inside or outside of containment if justified. Same as above. TABLE 1 POSSIBLE SOLUTION FOR FULL COMPLIANCE WITH BTP 5-4 AND RECOMMENDED IMPLEMENTATION FOR CLASS 2 PLANTS Design Requirements of BTP 5-4 Process and [System or