Document: NUREG-0800
Document ID: f1b42595-bded-40aa-9d0a-68db845fc3e8
Document Type: srp
Title: MAIN STEAM SUPPLY SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350073.pdf
Revision Date: 2023-06
Chapter: 10
Section ID: 10.3
CFR Part: 
CFR Title: 

Content:
The main steam lines from the steam generators to the containment isolation valves in PWR plants are classified seismic Category I and Quality-Group B. b. The main steam lines in BWR plants extending from the outermost con- tainment isolation valve and connected piping up to and including the 10.3-5 Rev. 3 - April 1984 first valve that is either normally closed or capable of automatic closure during all modes of normal reactor operations but not including the turbine stop and bypass valves are classified seismic Category I and a quality group classification in accordance with BTP RSB 3-1. Alternatively, for BWRs containing a shutoff valve (in addition to the two containment isolation valves) in the MSSS, seismic Category I and a quality group classification in accordance with BTP RSB 3-2 should be applied to that portion of the MSSS extending from the outermost containment isolation valves up to and including the shutoff valve. 4. The SAR is reviewed to assure that design provisions have been made to 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 would be required by this program. 5. The system description, safety evaluation, component table, and P&IDs are reviewed to verify that the system has been designed to: a. Provide the necessary quantity of steam to any turbine-driven safety system pumps. The reviewer verifies that the design is capable of providing the required steam flow to the turbine so that an adequate supply of water can be pumped. (OL) b. Assure safe plant operation by including appropriate design margins for pressure relief capacity and setpoints for the secondary system, and for removal of decay heat during various accident conditions, as may be applicable in a particular case. The review is done on a case-by-case basis, and system