Document: NUREG-0800
Document ID: 632e6c59-03bd-4648-b0b3-e8b2efd6fa04
Document Type: srp
Title: CONTAINMENT ISOLATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0703/ML070380197.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.4
CFR Part: 
CFR Title: 

Content:
whether appropriate containment integrity is maintained in SBO by the capability, independent of the preferred and blacked-out unit's onsite emergency AC power supplies, for valve position indication and closure for containment isolation valves that may be in open positions at the onset of SBO. Certain containment isolation valves are excluded from consideration as addressed in RG 1.155. For pressurized water reactors the reviewer verifies whether sufficient procedures and controls reasonably assure that containment closure is possible during reduced inventory conditions. Containment closure must be achieved prior to the time at which loss of decay heat removal coupled with inability to initiate alternate cooling or addition of water to the reactor coolant system inventory could cause an uncovered core. These controls should be in use: A. Prior to a reduced RCS inventory condition for Combustion Engineering or Westinghouse nuclear steam supply systems and B. Prior to an RCS condition in which the water level is lower than four inches below the top of the flow area of the hot legs at the junction of the hot legs to the reactor vessel for Babcock and Wilcock nuclear steam supply systems. 11. For review of a DC application, the reviewer should follow the above procedures to verify that the design, including requirements and restrictions (e.g., interface requirements and site parameters), set forth in the final safety analysis report (FSAR) meets the acceptance criteria. DCs have referred to the FSAR as the design control document (DCD). The reviewer should also consider the appropriateness of identified COL action items. The reviewer may identify additional COL action items; however, to ensure these 6.2.4-16 Revision 3 - March 2007 COL action items are addressed during a COL application, they should be added to the DC FSAR. For review of a COL application, the scope of the review is dependent on whether the COL applicant references a DC, an early site permit (ESP) or