ML13210A300
| ML13210A300 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 07/30/2013 |
| From: | Duke Energy Carolinas |
| To: | Office of Nuclear Reactor Regulation |
| Jason Paige NRR/DORL, 415-5888 | |
| References | |
| 13-MN-002 | |
| Download: ML13210A300 (13) | |
Text
McGuire Nuclear Station Units 1 & 2 Proposed Relief Request 13-MN-002 Risk-Informed/Safety Based (RIS_B)
ISI Alternative for Class 1 and 2 Piping Pre-Submittal Meeting with NRC 7/30/13 1
07/30/2013
Proposed RR 13-MN-002 Pre-Submittal Meeting
- A lot of precedents available (see Slide 7)
- Need NRC approval by end of July 2014 to support next Unit 1 outage in September of 2014
- Plan to submit this RR by 8/13/13
- If approved by NRC, Unit 1 weld exam scope in 1EOC23 will be significantly reduced 2
07/30/2013
Proposed RR 13-MN-002 Pre-Submittal Meeting
- Dose saving for the site
- RR structure
- Standard RR items (see Slides 4-7)
- Template: Application of N-716 (see Slides 8-10)
- Attachment A: McGuire PRA Quality Review (see Slides 10-12) 3 07/30/2013
Proposed RR 13-MN-002 Pre-Submittal Meeting
- ASME Code Components Affected:
- Classes 1 and 2
- Exam Categories: B-F, B-J, C-F-1, and C-F-2
- Applicable Code Edition and Addenda:
- Unit 1: 1998 Edition with 2000 Addenda for Period 1; same Code of Record for Unit 2 4th Interval for Periods 2 and 3.
- Unit 2: 2007 Edition with 2008 Addenda 4
07/30/2013
Proposed RR 13-MN-002 Pre-Submittal Meeting
Reason for Request
Use Risk-Informed/Safety Based (RIS_B) ISI process in lieu of traditional Section XI requirements By focusing inspections on the most safety-significant welds, the number of inspections can be reduced while maintaining protection of public health and safety Proposed Alternative and Basis for Use RIS_B is based on Code Case N-716 N-716 is based, in large part, on NRC-Approved EPRI TR 112657 Rev. B-A EPRI TR 112657 Rev. B-A satisfies RG 1.174 and RG 1.178 EPRI TR 112657 Rev. B-As steps applied to RIS-B RR:
Scope Definition Consequence Evaluation Degradation Mechanism Evaluation Piping Segment Definition Risk Categorization Inspection/NDE Selection Risk Impact Assessment Implementation and Feedback 5
07/30/2013
Proposed RR 13-MN-002 Pre-Submittal Meeting
- N-716:
- Replaces detailed evaluation of each piping segments safety significance with a generic population of high safety significant (HSS) segments based on exhaustive risk informed ISI experience to date
- PRA Internal flooding analysis required to identify any plant-specific HSS segments
- Low safety significant (LSS) welds shall include all other class 2, 3 or non-class welds not classified as HSS
- All piping components subject to current ASME requirements, regardless of risk classification, will continue to receive ASME pressure testing 6
07/30/2013
Proposed RR 13-MN-002 Pre-Submittal Meeting
- Duration of Proposed Alternative
- Both units: duration of the 4th ISI Intervals
- Precedents
- Vogtle 1&2
- DC Cook 1&2
- Grand Gulf
- Waterford
- North Anna
- Calvert Cliffs 1&2
- River Bend
- ANO 1&2
- Ginna
- Farley 1&2 7
07/30/2013
Proposed RR 13-MN-002 Pre-Submittal Meeting
- Template: Application of ASME N-716 (by Structural Integrity, Inc. except where stated otherwise)
- Introduction
- Relation to NRC RG 1.174 and 1.178
- PRA Quality (by Duke)
- Proposed Alternative to Current ISI Program
- Augmented Programs 8
07/30/2013
Proposed RR 13-MN-002 Pre-Submittal Meeting
- RIS_B ISI Process
- Safety Significance Determination
- Failure Potential Assessment
- Element and NDE Selection
- Current Examinations
- Successive Examinations
- Scope Expansion
- Program RRs
- Risk Impact Assessment
- Quantitative Analysis
- Defense-in-Depth 9
07/30/2013
Proposed RR 13-MN-002 Pre-Submittal Meeting
- Implementation
- Feedback (Monitoring)
- Proposed ISI Plan Change
- References/Documentation
- Attachment A: McGuire PRA Quality Review
- Introduction
- Purpose is assessment of the technical adequacy of the MNS PRA model of record for use in the RIS_B ISI submittal to NRC. Any discrepancies between the model of record and the technical adequacy assessment will be supported using sensitivity studies 10 07/30/2013
Proposed RR 13-MN-002 Pre-Submittal Meeting
- Description of Method
- A qualitative discussion is provided for the disposition of each finding and observation (F&O) from the internal gap assessment to the ASME/ANS PRA Standard and peer review to NEI 00-02
- Sensitivity Studies
- Assessment of Technical Adequacy for the Internal Events Model 11 07/30/2013
Proposed RR 13-MN-002 Pre-Submittal Meeting
- Internal Events Peer Review to NEI 00-02
- Strengths
- Recommended Areas for Improvement 12 07/30/2013
Proposed RR 13-MN-002 Pre-Submittal Meeting
- Contacts:
- Sect. XI: Hoang Dinh
- Structural Integrity: Scott Chesworth
- PRA: Lee Kanipe
- Regulatory Affairs: P T Vu 13 07/30/2013