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:
e rate and with sufficient margin, the calculated pressure and temperature conditions resulting from any LOCA. Accordingly, containment electric penetrations should be designed to accommodate, without exceeding their design leakage rate, the calculated pressure and temperature conditions resulting from a LOCA. In addition, the penetration conductors should be able to withstand all ranges of over load and short circuit currents up to the maximum fault current vs time conditions that could occur given single random failures of circuit protective devices. This criterion, as it applies to this SRP section, relates specifically to ensuring the integrity of containment electrical penetrations in the event of design basis LOCA conditions. SRP Section 8.3.1 cites RG 1.63 and the industry standards, IEEE Std. 317 and IEEE Std. 741, for electric penetration design and protection, respectively, as guidance acceptable to the staff for meeting the requirements of this criterion. Meeting the requirements of GDC 50 provides assurance that a LOCA will not cause a containment structure, including its electrical penetrations, to exceed the design leakage rate, thus limiting the consequences of a LOCA. 8.3.1-18 Revision 4 - May 2010 8. Compliance with 10 CFR 50.63 requires that each light-water-cooled nuclear power plant be able to withstand for a specified duration and recover from an SBO. As required by 10 CFR 50.63, electrical systems that are necessary support systems for SBO provide sufficient capacity and capability to ensure that core cooling and appropriate containment integrity are maintained in the event of an SBO. One acceptable means of complying with 10 CFR 50.63 requirements involves the provision of an alternate ac (AAC) source (as defined in 10 CFR 50.2) of sufficient capacity, capability, and reliability for operation of all systems necessary for coping with SBO and for the time necessary to bring and maintain the plant in safe shutdown that will be available on a