Document: NUREG-0800
Document ID: 9cfc38bf-7808-446e-a43d-4ca9ff55df2a
Document Type: srp
Title: AC POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1007/ML100740289.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.1
CFR Part: 
CFR Title: 

Content:
s requirement will provide assurance that equipment and structures will be designed to withstand the effects associated with natural phenomena, thus decreasing the probability that seismically- and/or climatology-related natural phenomena could initiate accidents or prevent equipment from performing its safety function during an accident. 2. Compliance with GDC 4 requires that SSCs important to safety (a) be designed to accommodate the effects of, and be compatible with, the environmental conditions associated with normal operation, maintenance, testing, and postulated accidents and (b) be appropriately protected against dynamic effects, including the effects of missiles, that may result from equipment failures. 8.3.1-14 Revision 4 - May 2010 The ac power system is necessary to provide power to systems important to safety during normal, abnormal, accident, and postaccident conditions. Meeting these requirements will provide assurance that the ac power system will supply electric power necessary for operation of systems important to safety even if/when subject to adverse environmental conditions and/or dynamic effects. 3. Compliance with GDC 5 requires that SSCs important to safety not be shared among nuclear power units, unless it can be shown that such sharing will not significantly impair their ability to perform their safety functions, including, in the event of an accident in one unit, an orderly shutdown and cooldown of the remaining units. Accordingly, component parts of the ac power system should not be shared among units without sufficient justification, thereby ensuring that an accident in one unit of a multiple- unit facility can be mitigated using an available compliment of mitigative features, including necessary ac power, irrespective of conditions in the other units and without giving rise to conditions unduly adverse to safety in another unit. SRP Section 8.3.1 cites RGs 1.32 and 1.81 to establish acceptable guidance related to the sharing of SSCs of