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:
ipment protective in nature, are only in the DCD Tier 2. All of the interlocks are not tested in the system ITAAC because the overall logic is checked in the I&C ITAACs for the safety system logic. 9. AUTOMATIC OVERRIDE SIGNALS Automatic signals that override equipment protective features during a DBE (e.g., thermal overloads for MOVs), need not be included in the ITAAC if there are other acceptable methods for assuring system function during a design basis event. 10. SINGLE FAILURE The design description will not state that the system meets single failure criteria (SFC). There will not be an ITAAC to verify that the system meets single failure, rather, the 14.3-47 DRAFT Rev. 0 - April 1996 system attributes such as independence and physical separation which relate to the SFC will be in ITAAC. 11. FLOW CONTROL VALVES In general, the flow control capability of control valves does not have to be tested in ITAAC. However, flow control valves should be shown on the figure if they are required to fail-safe or receive a safety actuation signal. The fail-safe position should be noted on the figure, or discussed in the DD if there is no figure. 12. PRESSURE TESTING OF VENTILATION SYSTEMS Where ductwork constitutes an extension of the control room boundary for habitability, the ductwork should be pressure tested. C. STYLE GUIDELINES FOR ITAAC 1. The first column (design commitment (DC)) should be as close in wording to the design description as possible. 2. The middle column of the ITAAC always should contain at least one of the three "Inspection" or "Test" or "Analysis". Sometimes, it will be a combination of the three. 3. Standard pre-ops tests defined in the DCD Tier 2 and Reg Guide 1.68 are not a substitute for ITAAC, however, the results of pre-op tests can be used to satisfy an ITAAC. DCD Tier 2 and Reg Guide 1.68 tests should be examined and tests elevated to ITAAC as necessary. 4. If an ITAAC test is not normally done as part of a pre-operational test, the test