Document: NUREG-0800
Document ID: 3ab8ae04-e11b-4993-a907-f644301c5af2
Document Type: srp
Title: MAIN STEAM SUPPLY SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070577.pdf
Revision Date: 2023-06
Chapter: 10
Section ID: 10.3
CFR Part: 
CFR Title: 

Content:
d components important to safety be designed to withstand potential dynamic effects, such as missile impact, pipe whip, jet impingement, etc., caused by equipment failure or outside events. The safety functions of the MSSS are plant design specific and may include: steam supply to safety-related auxiliaries and ESF pumps, provision of a heat sink during certain transients and accidents, limiting RCS pressure during certain transients, steam generator and MSSS overpressure protection, and termination of MSLB events. For BWRs, the MSSS provides fission product isolation during and following postulated accidents, and for BWRs without a MSIVLCS, fission product retention and holdup during and following an accident. The MSSS must be able to perform its safety functions while withstanding the harshest effects of postulated plant equipment failures, such as pipe rupture, or potential outside events, such as an airplane crash. Regulatory Guide 1.115 provides specific guidance for protecting safety-related structures, systems, and components from low-trajectory missiles resulting from turbine failure. Meeting the requirements of GDC 4 and the positions of Regulatory Guide 1.115 will provide assurance that the MSSS is capable of carrying out its safety functions in the event of adverse conditions caused by equipment failure or outside events. DRAFT Rev. 4 - April 1996 10.3-8 3. GDC 5 prohibits sharing of structures, systems, and components important to safety among nuclear units unless such sharing will not impair the ability of the structures, systems, and components to perform design safety functions in their respective units. The safety functions of the MSSS are plant design specific and may include: steam supply to safety-related auxiliaries and ESF pumps, provision of a heat sink during certain transients and accidents, limiting RCS pressure during certain transients, steam generator and MSSS overpressure protection, and termination of MSLB events. For BWRs, the MSSS