Document: NUREG-0800
Document ID: 87477809-7581-4701-b6f2-91410029e1c8
Document Type: srp
Title: MAIN STEAM SUPPLY SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0703/ML070380206.pdf
Revision Date: 2023-06
Chapter: 10
Section ID: 10.3
CFR Part: 
CFR Title: 

Content:
ew of ITAAC cannot be completed until after the completion of this section. IV. EVALUATION FINDINGS The reviewer verifies that the applicant has provided sufficient information and that the review and calculations (if applicable) support conclusions of the following type to be included in the staff's safety evaluation report. The reviewer also states the bases for those conclusions. The MSSS includes all components and piping from the outermost containment isolation valves for BWRs—and from the steam generator connection for PWRs—up to and including the turbine stop valves. The essential portions of the MSSS are designed to Quality Group B, specifically (1) for PWRs, from the steam generator to the containment isolation valves as well as connected piping up to and including the first valve that is normally closed and (2) for BWRs, from the outermost containment isolation valves and connecting piping up to and including the 10.3-13 Revision 4 - March 2007 first valve that is either normally closed or capable of automatic closure during all modes of normal reactor operation, but not including the turbine stop and bypass valves. Those portions of the MSSS necessary to mitigate the consequences of an accident such as a steamline break are designed to the quality standards commensurate with the importance of their safety functions and are designed to the standards listed below. The scope of review of the MSSS for this plant included layout drawings, P&IDs, and descriptive information for the system. The basis for acceptance of the MSSS in this review was the degree to which the applicant’s design criteria and bases conform to the Commission's regulations in 10 CFR 50.63 and in the GDC in Appendix A to 10 CFR Part 50. The staff concludes that the plant design is acceptable and meets the requirements of GDC 2, 4, 5, and 34 and of 10 CFR 50.63. This conclusion is based on the following: 1. The applicant has met the requirements of (1) GDC 2 with respect to the