Document: NUREG-0800
Document ID: 72755eb7-49f0-4442-a13a-2e990c4e3733
Document Type: srp
Title: EQUIPMENT AND FLOOR DRAINAGE SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350554.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.3.3
CFR Part: 
CFR Title: 

Content:
mum system requirements. The system P&IDs, layout drawings, and component descriptions and character- istics are then reviewed for the following points: a. Essential portions of the EFDS are correctly identified and are isolable from the nonessential portions of the system to the extent required by system performance requirements. b. Essential portions of the EFDS are classified Quality Group C or higher and seismic Category I. Components and system descriptions in the SAR are reviewed by ASB to verify that the seismic and safety classifications have been included, and that the P&IDs indicate any points of change in piping quality group classification. The review for seismic design is performed by the SEB and the review for seismic and quality classification is-performed by the MEB as indicated in subsection I of this SRP section. 3. The reviewer verifies that the system safety functions will be maintained, as required, in the event of adverse environmental phenomena such as earthquakes, or in the event of certain pipe breaks. The reviewer evaluates 9.3.3-4 Rev. 2 - July 1981 the system, using engineering judgment, failure modes and effects analyses, and the results of reviews performed under other SRP sections, *to determine that: a. Failure of nonessential 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 nonseismic Category I structures that house, support, or are close to essential portions of the EFDS, will not preclude operation of the essential portions of the EFDS. Reference to SAR Chapter 2 (which describes site features) and the general arrangement'and layout drawings will be necessary. Statements in the SAR to the effect that the above conditions are met are acceptable. b. System capability to prevent drain or flood water from backing up in the drainage system into areas housing safety-related equipment has been incorporated. Statements in the SAR that this