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:
D 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) I. Functional requirement for taking to cold shutdown: a. Capability using only Safety-grade systems. b. Capability with either only onsite or only offsite power and with a single failure (limited action outside control room to meet the single failure criterion). c. Reasonable time for cooldown assuming most limiting single failure and only offsite or only onsite power. Long-term cooling [RHR drop line]. Provide double drop line (or valves in parallel) to prevent single valve failure from stopping RHR cooling function. (Note: This requirement in conjunction with meeting the effects of a single failure for long-term cooling and isolation requirements involve increased number of independent power supplies and possibly more than four valves.) Compliance will not be required 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. 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 5-4-8 Revision 4 - March 2007 Heat removal and RCS circulation during cooldown to cold shutdown. (Note: Need steam generator cooling to maintain RCS circulation even after RHR in operation when under natural circulation [steam dump valves].) Provide safety-grade dump valves, operators, power supply, and other equipment 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