ML18171A084

GSI-191 Program Use of Risk Metrics for Containment Sump Tech Spec Operability Determination June 21, 2018 Public Meeting Slides (MF8521, MF8522; L-2016-LRM-0001)

ML18171A084
Person / Time
Site:	Calvert Cliffs
Issue date:	06/21/2018
From:	Exelon Generation Co
To:	Marshall M Plant Licensing Branch 1
Marshall M, NRR/DORL/LPLI, 415-2871
References
CAC MF8521, CAC MF8522, EPID L-2016-LRM-0001
Download: ML18171A084 (4)

Text

Calvert Cliffs GSI-191 Program Use of Risk Metrics for Containment Sump Tech Spec Operability Determination June 21, 2018

Future Licensing Basis

• After the Risk-Informed GSI-191 license amendment is approved, Calvert Cliffs licensing basis for operability of emergency recirculation sump will be risk-based.

- The risk of LOCA events that could threaten strainer performance is Very Low, which is consistent with RG 1.174 acceptance guidelines

• Proposed Technical Specification for the Containment Sump 1 Summary of Calvert Cliffs Risk-Informed Approach

Debris Acceptance Guidelines

• The following is the proposed risk metric to be added to the UFSAR.

RISK INCREASE LIMITS DUE TO CONTAINMENT DEBRIS

- The CDF or LERF values due solely to the effects of debris on the emergency recirculation strainer may not exceed the following limits.

- Maximum CDF limit = 3.0E-07 - Maximum LERF limit = 3.0E-08

- Current preliminary results from GSI-191 risk analysis 2 Summary of Calvert Cliffs Risk-Informed Approach

Questions/Concerns

• Jointly Review Issues, Questions, and Concerns 3 Summary of Calvert Cliffs Risk-Informed Approach