ML21098A145
| 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