Document: NUREG-0800
Document ID: bc7e4c14-0eaa-4591-a506-23d7893f8a00
Document Type: srp
Title: as establishing acceptable guidance for meeting the requirements of this criterion.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070498.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.1
CFR Part: 
CFR Title: 

Content:
units. In ensuring that the proposed design for sharing diesel generators between 8.3.1-21 DRAFT Rev. 3 - April 1996 units meets the requirements of General Design Criteria 5 and 17 as supplemented by General Design Criteria 34, 35, 38, 41, and 44 and satisfies the positions of Regulatory Guide 1.9, the PSBEELB reviewer is guided by Regulatory Guide 107 1.81. This guide sets forth two principal positions. Position C.3 applies to those 108 construction permit applications docketed after June 1, 1973, and prohibits the sharing of onsite power systems between units. Conformance of the design with Position C.3 is verified by reviewing the descriptive information, including electrical drawings, to ensure that the onsite power system of each unit is electrically independent with respect to the onsite power system of other units. Position C.2 of Regulatory Guide 1.81 establishes acceptable bases under which 109 sharing of onsite power systems between units is permitted. Conformance with Position C.2 with regard to the adequacy of diesel generator capacity and 110 capability under the sharing mode of operation is verified by following the procedure discussed above for tabulating and summing all loads. In particular, the load tabulation and calculations establishing the diesel generator capacity are examined to ensure that the selected capacity is sufficient to power the minimum engineered safety feature (ESF) loads in any unit and safely shut down the 111 remaining units in the event of an accident in one unit and a single failure or spurious or false accident signal from another unit and loss of preferred power to all the units. In addition, the physical arrangement of instrumentation and control devices on control room panels and consoles in one unit with respect to the other units is examined to ensure that the design minimizes the coordination needed between unit operators to accomplish sharing of the standby power systems. In the absence of specific criteria in IEEE