Document: NRC Regulatory Guide
Document ID: 4774af39-208c-4761-97e8-2d66c6d14794
Document Type: regulatory_guide
Title: Performance-Based Containment Leak-Test Program (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2200/ML22006A317.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.163
CFR Part: 
CFR Title: 

Content:
-1391, Page 9 Extension of the Containment Type A Test Interval Beyond 15 Years Under Option B of Appendix J to 10 CFR Part 50,” dated December 8, 2008 (Ref. 18)). 6. For new reactor plants licensed under 10 CFR Part 52, applications requesting a permanent extension of the performance-based ILRT surveillance interval to 15 years, should be deferred until after the construction and testing of containments for that design have been completed and applicants have confirmed the applicability of NEI 94-01, Revision 3-A, and EPRI Report No. 1009325, Revision 2-A, including the use of past containment ILRT data. 7. When using the methodology in EPRI Report No. 1009325, Revision 2-A to permanently extend the ILRT interval to 15 years, the licensee should submit documentation indicating that the technical adequacy of the PRA used to support its performance-based Appendix J program is consistent with the guidance in RG 1.200, “Acceptability of Probabilistic Risk Assessment Results for Risk-Informed Activities,” (Ref. 19), relevant to the ILRT extension application. RG 1.200 describes one acceptable approach for determining whether a base PRA, in total or the parts that are used to support an application, is sufficient to provide confidence in the results, such that the PRA can be used in regulatory decision-making for light-water reactors. A minimum of Capability Category I of the ASME PRA standard should be applied as the standard for assessing PRA quality for ILRT extension applications, since approximate values of core damage frequency (CDF) and large early release frequency (LERF) and their distribution among release categories are sufficient to support the evaluation of changes to ILRT frequencies. The assessment of external events may be taken from existing analyses, previously submitted to, and approved by the NRC staff, or from another alternate method of assessing an order of magnitude estimate for the contribution of the external event to the impact of the