Document: NUREG-0800
Document ID: ea7ce8f5-32bf-4d8c-a653-e964bff0ef48
Document Type: srp
Title: EMERGENCY CORE COOLING SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070448.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.3
CFR Part: 
CFR Title: 

Content:
ense applications docketed prior to July 1981 the position will not be completely applied. Specifically, locking out power to valves will be permitted. For most plants it is expected that this will be sufficient to meet the single failure criteria. However, in other plants changes to the piping and valving arrangements may be required to satisfy the single failure criteria.190 3. Applications docketed on or after July 1981 will be reviewed according to the provisions of this item.191 1. CPs Under Review and Future CP Reviews The proposed position will be applied to all CP reviews for which an SER was not published prior to April 16, 1975. It is expected that all of the events of the proposed position will be applied for such reviews. Taking this position on CPs would eliminate the need for various schemes such as locking out power to valves located in the line between the various ECCS pumps and refueling water storage tank. 2. OLs Under Review For operating licenses that are presently under review and OLs to be reviewed in the future that are not covered by item 1, the proposed position will not be completely applied. Specifically, locking out power to valves will be permitted. For most plants it is expected that this will be sufficient to meet the single failure criteria. However, in other plants changes to the piping and valving arrangements may be required to satisfy the single failure criteria. 3. Plants Under Construction DRAFT Rev. 3 - April 1996 6.3-28 These plants will be handled as discussed in item C.2. It is expected, however, that we will discuss the proposed position with each of the applicable PWR vendors. It will be obvious to the vendors which plants now under construction may have a problem. Then a generic review may be conducted for those plants that have a severe problem. 4. Operating Plants All of the operating plants are being evaluated as an ongoing part of the current ECC review. The review should be conducted as discussed in item C.2 to