ML18298A166
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| ML18298A166 | |
| Person / Time | |
|---|---|
| Issue date: | 10/23/2018 |
| From: | Office of Nuclear Regulatory Research |
| To: | |
| Raynaud P | |
| References | |
| Download: ML18298A166 (8) | |
Text
PFM Regulatory Guide Tiered Approach Idea Generation October 23, 2018 Category 2 Public Meeting
Purpose, Driver and Process
Purpose:
To discuss thoughts on tiered approach to PFM Reg Guide
- Driver: A tired approach to the PFM RG will help focus the guidance where it is needed, thus increasing its efficiency and effectiveness
- Process: Sharing of ideas through roundtable/brainstorming open discussions 2
Open discussion
- No ideas are discounted or criticized
- Use ideas in the development of new ideas
- NRC will document all thoughts/ideas 3
Questions
- Assuming a tiered approach is needed, what factors differentiate between tiers? Are multiple factors weighted?
- What changes between the tiers?
4
Thoughts to Spur Discussion
- How to determine tiering? - Tier Driver
- Code complexity/type
- Limited random variables versus xLPR/FAVOR
- Modified previously approved code
- Component safety impact
- Class 1,2,3: high versus moderate energy
- Code application type
- Reduction (one cycle or forever) in inspection versus code case use
- Code use
- PFM as sole basis versus supporting basis
- Generic versus plant specific 5
Thoughts to Spur Discussion
- What are we tiering? - Tier Topic
- QA
- Not QA coverage, but what needs to be submitted: all QA documents versus QA summary. Third party reviews?
- V&V
- Not V&V coverage, but what needs to be submitted: final V&V report with all supporting runs versus V&V description
- Code Technical basis
- Technical basis document versus submit code to NRC
- Uncertainty
- Mean values versus 95th percentile
- Additional analyses
- No additional analyses versus sensitivity analyses, deterministic analyses, etc.
6
Thoughts to Spur Discussion
- Other considerations?
- How many tiers (drivers and topics) are needed?
- Is weighting necessary?
- Are drivers tied to certain topics?
- How much is too much before it becomes cumbersome?
7 Drivers 1
2 3
Topics 1
2 3
Open Discussion 8