ML21098A145: Difference between revisions

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{{#Wiki_filter:Overview of GI process for Aluminum HEAF NRR/Division of Risk Assessment RES/Division of Risk Analysis Dr. J.S. Hyslop, NRR/DRA/APLB, presenting
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No Immediate Safety Concern
* HEAF already evaluated in plants with a PRA
* A larger ZOI for Al HEAF does not necessarily mean a higher risk
* Plants maintain defense-in-depth to safely shutdown a plant following a fire
* Measures are in place at plants which can prevent a HEAF
* Plants already have contingency plans for loss of large areas from fires and explosions HEAF Pre-Generic Issue Update - April 6th, 2021 2
 
Met Screening Phase Criteria
* Potentially significant risk increase from Al HEAF (above existing approach for HEAF)
      - Test results indicate potential for larger ZOI
      - Al HEAF, like fire PRA in general, is highly configuration specific
* Issue applies to two or more plants
* Issue is well defined, discrete, and technical
* Issue is not being addressed using other regulatory programs and processes, existing regulations, policies, or guidance.
HEAF Pre-Generic Issue Update - April 6th, 2021        3
 
Met Screening Phase Criteria (cont.)
* Issue can be resolved by new or revised regulation, policy, or guidance
* Resolution of the issue may involve review, analysis, or action by the affected licensees
      - Can resolve issue by licensees identifying location of Al and performing analysis, and taking appropriate action HEAF Pre-Generic Issue Update - April 6th, 2021          4
 
Assessment Phase
* Current phase
* Al HEAF is Pre-GI 018 at this phase
* EPRI survey indicates that all plants have Aluminum in some HEAF susceptible equipment
* Evaluate increase in risk due to Al HEAF enhanced model for current configuration of plants with fire PRAs
      - Use PRA methodology for Al HEAF under development by NRC/EPRI MOU working group, including new ZOIs
* Evaluate impact on protected train for plants with no fire PRA (i.e. a subset of those plants with a deterministic licensing basis)
HEAF Pre-Generic Issue Update - April 6th, 2021      5
 
Regulatory Office Implementation(ROI)
Phase
* Should the assessment determine that either a plant with a fire PRA, or a plant with a deterministic licensing basis and no fire PRA, meet the staff criteria for significance, then the issue will transition to the ROI phase.
* Perform a regulatory analysis for plants with a fire PRA
* Courses of action evaluated
* Generic communication as necessary
* Advantages to industry and the NRC for plants to participate in Assessment and ROI phases HEAF Pre-Generic Issue Update - April 6th, 2021      6
 
GI Process Summary HEAF Pre-Generic Issue Update - April 6th, 2021}}

Revision as of 19:57, 8 September 2021

2A - Generic Issue - Overview of GI Process for Aluminum HEAF
ML21098A145
Person / Time
Issue date: 04/06/2021
From: Js Hyslop
NRC/NRR/DRA/APLB
To:
Kenneth Hamburger
Shared Package
ML21098A144 List:
References
Download: ML21098A145 (7)
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