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:
REVIEW RESPONSIBILITIES Primary - Auxiliary Systems Branch (ASB) Power Systems Branch (PSB) Plant Systems Branch (SPLB)1 Secondary - None I. AREAS OF REVIEW The main steam supply system (MSSS) for both boiling water reactor (BWR) and pressurized water reactor (PWR) plants transports steam from the nuclear steam supply system to the power conversion system and various safety-related or and nonsafety-related auxiliaries. Portions of 2 the MSSS may be used as a part of the heat sink to remove heat from the reactor facility during certain operations and may also be used to supply steam to drive engineered safety feature pumps. The MSSS may also include provisions for secondary system pressure relief in PWR plants. The MSSS for the BWR direct cycle plant extends from the outermost containment isolation valves up to and including the turbine stop valves, and includes connected piping of 6.4 centimeters (2-1/2 inches) nominal diameter and larger up to and including the first valve that is 3 either normally closed or is capable of automatic closure during all modes of reactor operation. The MSSS for the PWR indirect cycle plant extends from the connections to the secondary sides of the steam generators up to and including the turbine stop valves, and includes the containment isolation valves, safety and relief valves, connected piping of 6.4 centimeters (2-1/2 inches)4 nominal diameter and larger up to and including the first valve that is either normally closed or capable of automatic closure during all modes of operation, and the steam line to the auxiliary 5 feedwater pump turbine. The SPLBASB is responsible for the review of the MSSS from the DRAFT Rev. 4 - April 1996 10.3-2 containment up to the turbine stop valve and including the outermost isolation valve. The PSB is responsible for the review of the remainder of the MSSS. (The turbine stop valve review is 6 included in SRP Section 10.2.) The SPLBPSB also determines the adequacy of the design, 7 installation,