Document: NUREG-0800
Document ID: f03d2c71-27a1-41fd-9362-1e62c6142e13
Document Type: srp
Title: Containment Systems and Severe Accidents (Tier 1)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070653.pdf
Revision Date: 2023-06
Chapter: 14
Section ID: 14.3.11
CFR Part: 
CFR Title: 

Content:
be specified in the DD except in special cases such as ISLOCA where the system has to meet additional requirements. 5. System operation The DD should provide a description of the important performance modes of operation of the system. This should include realignment of the system following an actuation signal (e.g., a safety injection signal for a PWR or a LOCA signal for a BWR). 6. Alarms, Displays and Controls The DD for the systems should describe the important system alarms, displays (do not use the term "indications"), and controls available in the control room. Important instrumentation that is required for direct operation or accident mitigation should be shown on the system figure, or described in the DD if there is no figure. Those that are provided for routine system performance monitoring or operator convenience need not be shown or discussed. The Generic Technical Guidelines (e.g., ERGs, EPGs) in DCD Tier 2 Chapter 18 should have identified the minimum set of controls, displays, and alarms necessary for the main control room (MCR) and remote shutdown panel (RSP), and these should be included in Tier 1. The functioning of the alarms, displays, and controls in the MCR and RSP must be verified in either the system ITAACs or in the MCR/RSP ITAACs. The intent is to test the integrated as-built system; however, separate testing of the actual operation of the system and the alarms/displays/controls circuits using simulated signals may be acceptable where this is not practical. See also the standard ITAAC for control room features and the remote shutdown panel in Appendix C to this SRP section. 7. Logic If a system/component has a direct safety function it typically receives automatic signals to perform some action. This includes start, isolation, etc. The DD captures these aspects related to the direct safety function of the system. 8. Interlocks Interlocks needed for direct safety functions will be included in the system DD. Examples include the interlocks to