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{{#Wiki_filter:}} | {{#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 | ||
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}} |
Latest revision as of 17:54, 19 January 2022
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) | |
Text
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
No Immediate Safety Concern
- 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
- 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
- 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