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:
lation valves) in the MSSS, seismic Category I and a quality group classification in accordance with Branch Technical Position 3-2 should apply to that portion of the MSSS extending from the outermost containment isolation valves, up to and including the shutoff valve. C. Main steamlines and other main steam system components in BWR plants that do not incorporate an MSIVLCS and that take credit for fission product holdup and retention in the main steamlines are reviewed for compliance with the criteria of II.8. Details of the quality group and seismic classification of main steamlines for BWRs without an MSIVLCS are addressed in Table A-1 and Figure A-1 of Branch Technical Position 3-1. 10.3-10 Revision 4 - March 2007 4. Review of the SAR assures that design provisions permit appropriate functional testing of system components important to safety. It is acceptable if the SAR delineates a testing and inspection program and the system drawings show any test recirculation loops or special connections around isolation valves that this program would require. 5. Review of the system description, safety evaluation, component table, and P&IDs verifies that the system has been designed for the following functions: A. Provide the necessary quantity of steam to any turbine-driven safety system pumps. The reviewer verifies that the design is capable of furnishing the required steam flow to the turbine so that an adequate supply of water can be pumped. B. Assure safe plant operation by including appropriate design margins for pressure relief capacity and setpoints for the secondary system. C. For PWRs, the design review verifies the design capability of the atmospheric dump valves supporting a controlled cooldown to about 177 EC (350 °F) to allow actuation of the RHR system. D. Provide a means to detect steam leakage from the system if a steamline were to break. Temperature or pressure sensors are an acceptable means for initiating signals to close the main steamline isolation