Document: NUREG-0800
Document ID: 97120913-d26f-4324-ab62-22f3f5b73925
Document Type: srp
Title: and 8.3.2.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0636/ML063600410.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.1
CFR Part: 
CFR Title: 

Content:
not interfere with safety actions that may be required of the reactor protection system. This system should also be reviewed to ensure that no failure mode of the TSO system will cause an incident at the generating station which would require protective action. 10. To verify that the relevant requirements of 10 CFR 50.63 are met, if an AAC source is proposed for safe shutdown in the event of a station blackout, the capacity, capability, reliability, and independence of the AAC power source are reviewed in accordance with SRP Section 8.4. 8.2-23 Revision 4 - March 2007 For evolutionary light water reactor design applications, the reviewer verifies, in accordance with SRP Section 8.4, that the AAC for station blackout is of diverse design (with respect to onsite sources), is consistent with guidance in Regulatory Guide 1.155, has adequate capacity, and has capability for powering at least one complete set of normal safe shutdown loads. 11. The Maintenance Rule Section 50.65(a)(4) requires that licensees assess and manage the increase in risk that may result from proposed maintenance activities before performing the maintenance activities. Regulatory Guide 1.182, used as a companion guide to Regulatory Guide 1.160, provides guidance for assessing and managing the increase in risk that may result from maintenance activities and for implementing the optional reduction in scope of SSC’s considered in the assessment. The review should verify that grid reliability evaluations are performed, as part of the maintenance risk assessment required by 10 CFR 50.65 before performing “grid-risk-sensitive” maintenance activities, including, but not limited to, surveillances, post-maintenance testing, and corrective and preventive maintenance. Such activities are those which could increase risk under existing or imminent degraded grid reliability conditions, including: (1) conditions that could increase the likelihood of a plant trip, (2) conditions that could increase the