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:
f Section 7 of IEEE Std 308, relating to sharing of structures, systems, and components of the Class 1E power system at multi-unit stations; and guidance related to the sharing of structures, systems, and components of the offsite power system (preferred power supply) at multi-unit stations, previously addressed in the 1980 and earlier versions of IEEE Std 308, but now covered in the industry standard for preferred power supply (Reference 52). 4. GDC 17 is satisfied as it relates to the preferred power system's (i) capacity and capability to permit functioning of structures, systems, and components important to safety; (ii) provisions to minimize the probability of losing electric power from any of the remaining supplies as a result of, or coincident with, the loss of power generated by the nuclear power unit, the loss of power from the transmission network, or the loss of power from the onsite electric power supplies; (iii) physical independence; (iv) availability and the guidelines of RG 1.32 (see also IEEE Std 308) as related to the availability and number of immediate access circuits from the transmission network; and (v) capability to meet the guidelines of Appendix A to SRP Section 8.2 as related to acceptability of generator circuit breakers and generator load break switches. For evolutionary light water reactor design applications, as documented in SECY 94-084 for designs such as the CE-ABB System 80+ and the GE ABWR, the design should provide at least one offsite circuit to each redundant safety division that is supplied directly from an offsite power source with no intervening non-safety buses, thereby permitting the offsite source to supply power for safety buses in the event the non-safety bus(es) fails. The design should also include an alternate power source to non-safety loads, unless it can be demonstrated that existing design margins will ensure that 8.2-8 Revision 5 - May 2010 transients for loss of non-safety power events are no more severe than