Document: NUREG-0800
Document ID: 2c839e4a-a342-4e25-9a7c-82d678a0f754
Document Type: srp
Title: NUREG-0800
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340657.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6
CFR Part: 
CFR Title: 

Content:
ssion pool should be greater than the technical specification limit for leakage measured in periodic drywell-wetwell leakage tests. Specific acceptance criteria for the three types of containments are as discussed in Appendix A. 5. In meeting the requirement of General Design Criterion 50 with respect to the design leakage rate for Mark III containments, justification should be provided for any reduction in the containment leak rate claimed for times less than 30 days after a postulated pipe break accident. This also includes meeting the regulatory position C.1.e of Regulatory Guide 1.3. 6. In meeting the requirement of General Design Criterion 16, provisions should be made in one of the following ways to protect the drywell and wetwell (or containment) of Mark I, II, and III plants, and the operating deck of Mark II plants, against loss of integrity from negative pressure transients or post-accident atmosphere cooldown: a. Structures should be designed to withstand the maximum calculated external pressure. b. Vacuum relief devices should be provided in accordance with the requirements of the ASME Boiler and Pressure Vessel Code, Section III, Subsection NE, to assure that the external design pressures of the structures are not exceeded. The vacuum relief valve guidelines are set forth in Appendix A to this SRP section. 7. In meeting the requirements of General Design Criterion 50, with respect to design margin for item 6 above, the external design pressures of the structures, including the design upward deck differential pressure for Mark II plants, should provide an adequate margin above the maximum calculated external pressures to account for uncertainties in the analyses. 8. The acceptability of the reactor coolant system safety/relief valve in-plant confirmatory test program shall be based on conformance with the guidelines specified in Section 6, 7, and 8 of NUREG-0763 (Ref. 1d). If the applicant/ licensee elects not to perform the SRV in-plant tests, the