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:
entrainment. 3. Compliance with GDC 5 requires that structures, systems, and components important to safety shall not be shared by nuclear power units unless it can be shown that such sharing will not significantly impair their ability to perform their intended safety functions, including, in the event of an accident in one unit, an orderly shutdown and cooldown of the remaining units. Meeting the requirements of GDC 5 provides assurance that the main steam system and its associated components will continue performing their required safety functions even if they are shared by multiple nuclear power units. 4. Acceptance of GDC 34 is based on the following: A. The positions in Branch Technical Position 5-4, as they relate to the design requirements for residual heat removal (RHR) B. Issue Number 1 of NUREG-0138, as it relates to credit being taken for all valves downstream of the main steam isolation valves (MSIVs) to limit blowdown of a second steam generator if a steamline were to break upstream of the MSIV 5. Acceptance of 10 CFR 50.63 is based on meeting Regulatory Guide 1.155 as it relates to the MSSS design. 6. Regulatory Guide 1.29, Positions C.1.a, C.1.e, C.1.f, C.2 and C.3, as it relates to the seismic design classification of system components. 7. Regulatory Guide 1.117, Appendix Position 2 and 4, as it relates to the protection of SSCs important to safety from the effects of tornado missiles. 8. SECY 93-087, as it applies to BWR plants that do not incorporate an MSIVLCS and for which main steamline fission product holdup and retention are credited in the analysis of design-basis accident radiological consequences as follows: A. Seismic Category I is the classification for the main steamlines extending from the outermost containment isolation valve to the seismic interface restraint and connected piping up to the first normally closed valve. B. The nonseismic Category I classification can apply to the main steamlines from the seismic interface restraint up