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:
increased instances of corrosion failures. In these risk impact assessments, the models that evaluate the change in risk from extending the test intervals are based on the assumption that the effects from incipient causes for equipment failures accumulate linearly over time. Large extensions of the surveillance intervals may not appropriately test for effects from unexpected failure modes or failure causes that behave nonlinearly with time. However, performance results from the extended test intervals up to 15 years that have been applied by licensees to date do not indicate that any new failure modes have been identified. Limiting the increase in the maximum test intervals to 15 years for Type A tests and 75 months for Type C tests is prudent. Continual licensee monitoring of the performance of these test intervals and the staggered performance of LLRT tests ensure licensees can appropriately identify trends and correct deficiencies. DG-1391, Page 7 Consideration of International Standards The International Atomic Energy Agency (IAEA) works with member states and other partners to promote the safe, secure, and peaceful use of nuclear technologies. The IAEA develops Safety Requirements and Safety Guides for protecting people and the environment from harmful effects of ionizing radiation. This system of safety fundamentals, safety requirements, safety guides, and other relevant reports, reflects an international perspective on what constitutes a high level of safety. To inform its development of this RG, the NRC considered IAEA Safety Requirements and Safety Guides pursuant to the Commission’s International Policy Statement (Ref. 14) and Management Directive and Handbook 6.6, “Regulatory Guides” (Ref. 15). The following IAEA Safety Requirements and Guides were considered in the update of the Regulatory Guide: • IAEA Safety Guide SSG-53, “Design of the Reactor Containment and Associated Systems for Nuclear Power Plants,” issued 2019 (Ref. 16) Documents