Document: NUREG-0800
Document ID: 92ba0daf-489d-4f71-82db-d6d781c71573
Document Type: srp
Title: as an aid for establishing consistency and comprehensiveness in the review of the systems.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070664.pdf
Revision Date: 2023-06
Chapter: 14
Section ID: 14.3
CFR Part: 
CFR Title: 

Content:
s which also cover the electrical independence and divisional power supply requirements. 3. Capacity and capability To ensure that the electrical systems have the capacity and capability to supply the safety-related electrical loads, ITAAC may be established to verify the adequate sizing of the electrical system equipment and its ability to respond (e.g., automatically in the times DRAFT Rev. 0 - April 1996 14.3.6-4 needed to support the accident analyses) to postulated events. This includes the Class 1E portion and the non-Class 1E portion to the extent that it is involved in supporting the Class 1E system. ITAAC should be included to analyze the as-built electrical system and installed equipment (diesel generators, transformers, switchgear, batteries, etc.) to verify its ability to power the loads. In addition, the ITAAC should also include tests to demonstrate the operation of the equipment. To ensure that the Class 1E portions of the electrical power system have the capability to respond to postulated events including LOCA, loss of normal preferred power, and degraded voltage conditions, ITAAC should be established to verify the initiation of the Class 1E equipment necessary to mitigate the event. ITAAC should be included to analyze the as-built electrical power system for its response to a LOCA, loss of voltage, combinations of LOCA and loss of voltage, and degraded voltage. In addition, tests should be included to demonstrate the actuation of the electrical equipment in response to postulated events. 4. Electrical protection features To ensure that the electrical power system is protected against potential electrical faults, ITAAC should be established to verify the adequacy of the electrical circuit protection included in the design. Operating experience and NRC Electrical Distribution System Functional Inspections (EDSFIs) have indicated some problems with the short circuit rating of some electrical equipment and breaker and protective device coordination.