Document: NUREG-0800
Document ID: 988a555f-fdfa-4452-829d-c06654bfbba5
Document Type: srp
Title: Initial Plant Test Program - Design Certification and New License Applicants
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070660618.pdf
Revision Date: 2023-06
Chapter: 14
Section ID: 14.2
CFR Part: 
CFR Title: 

Content:
g - emergency control room, remote shutdown panel NOTE:It may be difficult to rationalize its inclusion based on "accomplishing a direct safety function." The basis has to be more defense-in-depth and operating experience and possibly PRA. G. GDC 17 and 18 specified requirements. For example, GDC 17 requires that physically independent circuits be provided from the offsite to the Class 1E distribution system. Also GDC 17 requires provisions be included to minimize the probability of losing electric power from any of the remaining supplies as a result of or coincident with, the loss of power generated by the nuclear power unit, the loss of power from the transmission network, or the loss of power from the onsite electric power supplies. Here is a case where some design description and ITAAC or interface requirements are needed for a "non-Class 1E" area, because of its "importance to safety." GDC 18 requires electric power systems important to safety to be designed to permit appropriate periodic inspection and testing. H. Other specific rules and regulations that are applicable to electric systems. For example, the Station Blackout Rule (10 CFR 50.63) is met by an Alternate AC source or a coping analysis, and the appropriate features should be in Tier 1. These are non-Class 1E aspects, but are "important to safety." I. Regulatory Guides (RGs) which have specific recommendations (all of the RG recommendations may not need Tier 1 treatment). Here may be an area that Tier 1 treatment captures the design aspect addressed by the RG. J. Operating experience problems of safety significance that have been identified - particularly through Electrical Distribution System Functional Inspections (EDSFIs), Generic Letters, circulars, Regulatory Issued Summaries, NRC Bulletins and in some cases Information Notices. For example, degraded voltages, breaker coordination, and short circuit protection have been highlighted. K. Policy issues raised for the standard designs. For the