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:
tions of the MSSS that are essential for safe shutdown of the reactor or for preventing or mitigating the consequences of accidents are evaluated to determine the following: A. A single malfunction or failure of an active component would not preclude safety-related portions of the system from functioning as required during normal operations, adverse environmental occurrences, and accident conditions, including loss of offsite power. B. Appropriate quality group and seismic design classifications are met for safety-related portions of the system. C. The system is capable of performing multiple functions, such as transporting steam to the power conversion system, providing heat sink capacity or pressure relief capability, or supplying steam to drive safety system pumps (e.g., turbine-driven AFW pumps), as may be specified for a particular design. D. The MSSS design includes the capability to operate the atmospheric dump valves remotely from the control room following a safe-shutdown earthquake (SSE) coincident with the loss of offsite power so that a cold shutdown can be achieved by depending only on safety-grade components. 2. The MSSS review should include measures that limit blowdown of the system if a steamline were to break. 3. The review includes the design of the MSSS with respect to the following: A. Functional capability of the system to transport steam from the nuclear steam supply system as required during all operating conditions. B. Capability to detect and control system leakage and to isolate portions of the system in case of excessive leakage or component malfunctions. C. Capability to preclude accidental releases to the environment. D. Provisions for functional testing of safety-related portions of the system. 4. Inspections, Tests, Analyses, and Acceptance Criteria (ITAAC). For design certification (DC) and combined license (COL) reviews, the staff reviews the applicant's proposed ITAAC associated with the structures, systems, and components (SSCs)