Document: NUREG-0800
Document ID: 18405759-3ae6-4408-b6ab-7b3ca11fcd9f
Document Type: srp
Title: SAFE SHUTDOWN SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550085.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.4
CFR Part: 
CFR Title: 

Content:
individual plant design features, and (3) the conditions under which the safe shutdown has to be achieved and maintained. The functional performance requirements of safe shutdown systems and auxiliary supporting features and other auxiliary features are reviewed by other branches in accordance with the SRP sections that address these systems. During safe shutdown, reactivity control systems must maintain a subcritical condition of the core, and residual heat removal systems must operate to maintain adequate cooling of the core. For definitions of plant-specific shutdown conditions, see Chapter 16 in the applicant/licensee’s safety analysis report (SAR). Section 7.5 of the SRP addresses the information systems important to safety that provide information to the operator for the manual control of systems required for safe shutdown. Section 9.5.1 of the SRP includes the I&C provided as part of an alternative or dedicated shutdown capability needed for compliance with GDC 3, “Fire Protection.” Typical functions required for safe shutdown are: • Reactivity control • Reactor coolant makeup • Reactor pressure control • Decay heat removal • Suppression Pool Cooling (BWR) Typical auxiliary supporting features and other auxiliary features (additional information is provided in SRP Appendix 7.1-C) are: • Electric power systems • Component cooling water • Service water • Instrument air systems 2. 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) related to this SRP section in accordance with SRP Section 14.3, "Inspections, Tests, Analyses, and Acceptance Criteria." The staff recognizes that the review of ITAAC cannot be completed until after the rest of this portion of the application has been reviewed against 7.4-3 Revision 5 - March 2007 acceptance criteria