ML20289A658
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ML20289A658 | |
Person / Time | |
---|---|
Issue date: | 10/08/2020 |
From: | Matthew Humberstone Office of Nuclear Regulatory Research |
To: | |
Kichline M | |
Shared Package | |
ML20289A715 | List: |
References | |
Download: ML20289A658 (10) | |
Text
NRCs Crediting FLEX effort Matthew Humberstone, PhD Division of Risk Analysis, Office of Nuclear Regulatory Research 1
Objective
- Brief History
- Challenges
- Completed Tasks
- Example Areas
- Questions 2
Project History
- Fukushima Daiichi Accident (March 2011)
- NRC Mitigating Strategies (MS) Order (2012)
- 10 CFR 50.155, Mitigation of beyond-design-basis events (2019)
- Directed effort to evaluate and provide appropriate credit
- FLEX can be utilized beyond the orders to enhance safety
- The NRC wants to encourage safety enhancements
- Need to provide proper regulatory footprint
- (outages, defense-in-depth, LARs)
- 2 Approaches taken
- Industry developed NEI 16-06
- NRC evaluated areas of applications 3
FLEX OpE Data
- FLEX data needed to develop equipment failure probabilities
- Risk assessments that credit FLEX
- Collecting data from the industry and developing a report
- Report to the NRC in Feb 2020
- NRC audit
- March 24th - May 4th
- Audit Summary (ML20155K827)
- Commissions PRA policy statement:
PRA evaluations in support of regulatory decisions should be as realistic as practicable and appropriate supporting data should be publicly available for review.
4
- Current HRA methods not adequate
- Complex FLEX actions
- NRCs ongoing effort
- Finalize IDHEAS - General Methodology
- Audit Industry FLEX Data
- Prioritized Industry Support
- IDHEAS-ECA tool developed
- Assess range of FLEX cases
- Incorporated Data into SPAR Models
- FLEX Scenarios developed (Fall 2019) Task 2
- Workshop (Dec 2019)
- 6 HRA experts (3 NRC, 3 Industry)
- Issue tool and guidance RIL 2020-02
- FLEX expert support (2 site visits) Task 3
- Future Tasks
- Document Workshop results
- Release draft data report 5
Completed Tasks Review NEI 16-06 (Tier 1, Tier 2, and Tier 3)
- NRR Office Director memo to NEI (ML16167A034) (August, 2016)
- Internal memo to NRR/DRA Office Director (ML17031A269) (June 2017)
NUMARC 93-01 Revision (Maintenance Rule Scoping criteria)
- Guidance on modeling FLEX in recovery events IMC-0609 App O - Moved to App A
- Tiered Approach to crediting FLEX in risk assessments 6
Completed Tasks Continued SPAR model updates
Communications (Internal and External)
- Several RISC Meeting Briefings
- OEDO and RA Briefing
- Multiple public meetings
- Several RIC Sessions
- NEI Risk Forums
- Conferences
- MIT Executive Course on risk management Monitoring and Engaging crediting FLEX activities 7
Crediting FLEX examples
- License Amendment Requests (LARs)
- Deterministic Applications
- Risk-Informed Applications
- AOT extensions
- Pumps
- Crediting FLEX is common
- Notice of Enforcement Discretion (NOED) 8
Conclusions
- The NRC is providing credit for FLEX
- Lots of work has been accomplished
- Resolving Remaining Challenges
- FLEX OpE data
- Developing a more predictable and consistent approach to crediting FLEX 9
Questions???
1 10 0