Document: NUREG-0800
Document ID: ecf7a8d4-0097-4a93-8609-630545f03f70
Document Type: srp
Title: REGULATORY TREATMENT OF NONSAFETY SYSTEMS FOR PASSIVE
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1308/ML13081A756.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.3
CFR Part: 
CFR Title: 

Content:
the following 4 days) and to address seismic events. C. SSC functions relied on under power-operating and shutdown conditions to meet the Commission goals of a core damage frequency (CDF) of less than 1x10-4 each reactor year and a large release frequency (LRF) of less than 1x10-6 each reactor year. D. SSC functions needed to meet the containment performance goal, including containment bypass, during severe accidents. E. SSC functions relied on to prevent significant adverse systems interactions between passive safety systems and active nonsafety SSCs. The principal areas of the staff’s review are listed below. 19.3-4 Draft Rev.0 – June 2013 1. Identification of SSC functions needed to assure that reliability/availability missions are accomplished based on the five RTNSS criteria listed above. 2. Functional design of RTNSS SSCs to meet reliability/availability mission. a. Adequacy of functional design requirements b. Compliance with functional design requirements c. Design improvements to minimize adverse interaction between passive and nonsafety-related active systems. 3. Focused PRA sensitivity studies used to identify risk-significant SSCs in the scope of RTNSS program per RTNSS “C”. 4. The augmented design standards that must be met by SSCs in the scope of the RTNSS program including seismic design standards, standards for protection against natural phenomena, standards for protection against internal hazards (e.g., internal floods) and standards for assuring that SSC functions can be achieved expeditiously. 5. The regulatory treatment proposed for SSCs in the scope of RTNSS program. COL Action Items and Design Certification Requirements and Restrictions For a DC application, the review will also address COL action items and requirements and restrictions (e.g., interface requirements and site parameters). For a COL application referencing a DC, a COL applicant must address COL action items (referred to as COL license information in certain DCs) included