Document: NUREG-0800
Document ID: b5ea3f55-f54e-45cf-b921-3944d12b4ce2
Document Type: srp
Title: REACTOR AUXILIARY COOLING WATER SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350545.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.2.2
CFR Part: 
CFR Title: 

Content:
utes without the need for operator action. As an alternative to pump testing, the reviewer verifies that: (1) Instrumentation in accordance with IEEE 279 is provided consist- ent with the criteria for the protection system to initiate automatic protection of the plant upon loss of water to a pump. For this case, the component cooling water supply to the seal and bearing of the pump may be designed to nonseismic Category I requirements and Quality Group 0, or (2) The component cooling water supply to each pump is designed to be capable of withstanding a single active failure or a moderate-energy line crack as defined in Branch Technical Position ASB 3-1 and to seismic Category I, Quality Group C, and ASME Section III, Class 3 requirements. 5. The reviewer verifies that the system has been designed so that system functions will be maintained as required in the event of adverse environ- mental phenomena such as earthquakes, tornadoes, hurricanes, and floods. The reviewer evaluates the system using engineering judgment and the results of failure-modes and -effects analyses to determine the following: 9.2.2-8 Rev. 2 - Avril 1984 a. The failure of portions of the system or of other systems not designed to seismic Category I standards and located close to essential portions of the system, or of non-seismic Category I structures that house, support, or are close to essential portions of the CWS, will not preclude essential functions. The review will identify these nonseismic category components or piping and ensure that appropriate criteria are incorporated to provide isolation capabilities in the event of failure. Reference to SAR Chapter 2, describing site features, and the general arrangement and layout drawings will be necessary as well as the SAR tabulation of seismic design classifications for structures and systems. b. The essential portions of the CWS are protected from the effects of floods, hurricanes, tornadoes, and internally- or externally-generated missiles.