Document: NUREG-0800
Document ID: 8e754440-b70e-4b8a-9816-b4a64b631220
Document Type: srp
Title: Initial – February 2012
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1136/ML113640138.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8
CFR Part: 
CFR Title: 

Content:
ory Commission, Washington, D.C. 20555, Attention: Reproduction and Distribution Services Section, or by fax to (301) 415-2289; or by e-mail to DISTRIBUTION@nrc.gov . Electronic copies of this section are available through the NRC's public Web site at http://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr0800/ , or in the NRC's Agencywide Documents Access and Management System (ADAMS), at http://www.nrc.gov/reading-rm/adams.html , under Accession # ML113640138. NUREG-0800 U.S. NUCLEAR REGULATORY COMMISSION STANDARD REVIEW PLAN BRANCH TECHNICAL POSITION 8-8 ONSITE (EMERGENCY DIESEL GENERATORS) AND OFFSITE POWER SOURCES ALLOWED OUTAGE TIME EXTENSIONS REVIEW RESPONSIBILITIES Primary - Organization responsible for electrical engineering Secondary - None A. BACKGROUND Regulatory Guide (RG) 1.93 [Reference 1] provides guidance with respect to operating restrictions, that is Allowed Outage Time (AOT), if the number of available onsite emergency diesel generators (EDGs) and offsite power sources is less than that required by the Technical Specifications (TS). In particular, this RG prescribes a maximum AOT of 72 hours for an inoperable onsite or offsite power source. 8-8-2 Initial - February 2012 Additionally, the regulatory evaluation that staff applies in its review of the licensee’s request for proposed changes to Limited Condition for Operations were developed consistent with the objectives of the Commission’s Probabilistic Risk Assessment (PRA) Policy Statement, “Use of Probabilistic Risk Assessment Methods in Nuclear Activities: Final Policy Statement,” for enhanced decision making and will result in more efficient use of resources, improvement in safety, and reduction of unnecessary burden. The following regulatory guidance provides the staff position: a. RG 1.174, “An Approach for Using Probabilistic Risk Assessment in Risk-Informed Decisions on Plant-Specific Changes to the Licensing Basis,” [Reference 2] describes a risk-informed approach,