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:
tion by a combination of test and analysis. The analysis method for determining NPSH will typically be provided in the DCD Tier 2. 4. DIVISIONAL POWER SUPPLY ITAAC Electrical independence (separation) will be verified in the system ITAAC. Independent Class 1E power sources are required for components performing direct safety functions and are needed to meet single failure criterion, GDC 17, etc. Electrical separation will also be addressed in the electrical and I&C systems ITAAC. DRAFT Rev. 0 - April 1996 14.3-66 5. PHYSICAL SEPARATION ITAAC Physical separation (for hazards) will be verified in the ITAAC. The hazards postulated are Design Basis Events and, therefore, the design features that protect the equipment need to be verified by the ITAAC to demonstrate independence (and single failure). System features (switches, valves, dampers) used to provide protection from hazards will be included in the appropriate system design description and ITAAC. Structural features such as walls, doors, curbs, etc., will also be covered, but in most cases these will be in a building ITAAC. 6. CONTROL ROOM CONFIGURATION ITAAC Alarms, displays (the term "indications" should not be used in ITAAC), and controls - The design description will describe the system alarms, displays, and controls available in the control room. Important instrumentation will be shown on the system figure, as determined by its function or PRA. Where possible, integrated tests of the as-built systems from the control room are preferred. However, the operation of the system may be tested separately from the alarms, controls, and displays. Therefore, system ITAAC need only verify that these features "exist," and their performance will be addressed in the MCR, HFE and I&C ITAAC. The Generic Technical Guidelines (e.g., EPGs, ERGs) in Chapter 18 of the DCD Tier 2 identify the minimum set of alarms, displays, and controls necessary to perform safety functions. This minimum set should be included in Tier 1, either