Document: NUREG-0800
Document ID: 0270f2da-6b35-430d-b965-99a995adea26
Document Type: srp
Title: (Ref. 3).
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350476.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.1
CFR Part: 
CFR Title: 

Content:
ices; and the motive and control power sources. Conformance with the single failure criterion is verified by review of the same information as for redundancy. The guidance provided by IEEE Std 379 and Regulatory Guide (RG) 1.53 should be used for ascertaining that a given design is single failure proof.. A particularly important but subtle point to check is one cited in position 4 of RG 1.53, wherein a single d-c source supplies control power for one channel of system logic and for the redundant actuator circuit. Certain areas of review need close coordination between review branches in order to make a determination that a specific asoect of the design meets the applicable criteria. Seismic qualification of Class 1E equipment, flood protection of safety-related systems and components, and effects of high energy fluid line breaks inside containment or near safety-related equipment are the major areas for which branch coordination is essential in evaluating the acceptability of a given design feature. RG 1.75 provides guidance for satisfying the acceptance criteria with respect to the identification of power and signal cables, cable trays, and instrument panels related to systems required for safe shutdown. The criteria for identi- fication and separation of redundant systems discussed in RG 1.75 are pre- sented in sufficient detail to make their application self-explanatory. RGs 1.22, 1.47, and 1.68 provide the requirements that the design of systems required for safe shutdown should meet with regard to preoperational and periodic inservice testing. The primary review responsibility for the pre- operational testing is with the PTRB. Periodic testing and downtime 7.4-5. Rev. 2 - July 1981 restrictions are specified in the technical specifications. The review procedures for technical specifications are covered in SRP Chapter 16.0. An important area to be reviewed is the remote or local control stations that are required by GDC 19 for the safe shutdown of the plant in