Document: NUREG-0800
Document ID: 853719df-a6ea-408b-8d43-5956155abc38
Document Type: srp
Title: and 8.3.2.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1007/ML100740246.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.1
CFR Part: 
CFR Title: 

Content:
ions are performed for maintenance or modifications to the offsite power system, as part of the maintenance risk assessment required by 10 CFR 50.65 before performing Agrid-risk-sensitive@ maintenance activities. L. Operating experience has shown that undetected degradation of underground electric cables due to protracted exposure to wetted environments or submergence in water or resulting from pre-existing manufacturing defects could result in multiple equipment failures. Underground or inaccessible power and control cable runs that are susceptible to protracted exposure to wetted environments or submergence as a result of tidal, seasonal, or weather event water intrusion are reviewed. Cables from independent power sources or different safety divisions could be affected by the same condition. Underground or inaccessible power cables connecting offsite power to safety buses or power and control cables to equipment with accident mitigating functions should be considered in the review. Examples of submerged cable failures from the operating experience are provided in Reference 26. 2. To ensure that the requirements of GDC 18 are satisfied, the detailed description of the design should be examined to determine that the design includes provisions for testing the transfer of the source of power feeding the onsite distribution system, e.g., from the main generator supply to the preferred power system, or to any other supply. It should also be established that the circuitry required to perform these transfer functions has the capability of being tested during plant operation. The organization responsible for quality assurance and maintenance should review preoperational and initial startup test procedures. The organization responsible for quality assurance and maintenance should also review the periodic test procedures. RG 1.204 provides acceptable guidelines for an adequate and acceptable testing and maintenance approach for the reviewer to confirm the proper installation