Document: NUREG-0800
Document ID: e1169529-d2cb-4947-9efe-b23d927f4aa9
Document Type: srp
Title: NUREG40800
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350520.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8
CFR Part: 
CFR Title: 

Content:
iability data, that power systems with supporting grid interties meet the grid availabil- ity criterion with some margin. This conclusion is applicable to the review of most plants located on the U.S. mainland. 2. There is also strong indication that an isolated system large enough to justify inclusion of a nuclear unit will also meet this criterion. Aowever, as a conservative approach, the staff will examine the available generating capacity of a system, including interties if available, to withstand outage of the largest unit. If the available capacity is judged marginal to provide adequate stability of the grid, additional measures should be taken. These may include provisions for additional capability and margin for the onsite power system beyond the normal requirements, or other measures as may be appropriate in a particular case. The additional measures to be taken should be determined on an individual case basis. C. REFERENCES None. 8A-7 Rev. 2 - July 1981 BRANCH TECHNICAL POSITION ICSB-15 (PSB) REACTOR COOLANT PUMP BREAKER QUALIFICATION (BTP ICSB-15 (PSB) has been Deleted) I SA-8 Rev. 2 - July 1981 BRANCH TECHNICAL.POSITION ICSB-17 (PSB) DIESEL-GENERATOR PROTECTIVE TRIP CIRCUITBYPASSES BTP ICSB-17 (PSB) has been Superceeded by Position 7 of Regulatory Guide 1.9 (Revision 2) | 8A-9 Rev. 2 - July 1981 BRANCH TECHNICAL POSITION ICSB 18 (PSB) APPLICATION OF THE SINGLE FAILURE CRITERION TO MANUALLY-CONTROLLED ELECTRICALLY-OPERATED VALVES A. BACKGROUND Where a single failure in an electrical system can result in loss of capability to perform a safety function, the effect on plant safety must be evaluated. This is necessary regardless of whether the loss of safety function is caused by a component failing to perform a requisite mechanical motion, or by a component performing an undesirable mechanical motion. This position establishes the acceptability of disconnecting power to electrical components of a fluid system as one means of designing against a single