ML19298C093
| ML19298C093 | |
| Person / Time | |
|---|---|
| Issue date: | 11/04/2019 |
| From: | Dong Park NRC/NRR/DRO/IQVB |
| To: | Kerri Kavanagh NRC/NRR/DRO/IQVB |
| Park D | |
| References | |
| Download: ML19298C093 (3) | |
Text
November 4, 2019 MEMORANDUM TO: Kerri A. Kavanagh, Chief Quality Assurance and Vendor Inspection Branch Division of Reactor Oversight Office of Nuclear Reactor Regulation FROM: Dong H. Park, Reactor Operations Engineer /RA/
Quality Assurance and Vendor Inspection Branch Division of Reactor Oversight Office of Nuclear Reactor Regulation
SUBJECT:
SUMMARY
OF OCTOBER 18, 2019, CLOSED MEETING WITH FRAMATOME INC. REGARDING EVALUATION OF DEVIATIONS FROM TECHNICAL STANDARDS On October 18, 2019, a closed meeting was held between the U.S. Nuclear Regulatory Commission (NRC) staff and representatives of Framatome Inc. (Framatome) to discuss the Title 10 of the Code of Federal Regulations (10 CFR) Part 21 evaluation related to the post weld heat treatment (PWHT) deviation. Framatome presented background, discovery, experimental results and analyses for the welds affected in large components in three U.S. plants. The plants include Millstone (pressurizer), Prairie Island 2 (two U-tube steam generators) and Three Mile Island (two once-through steam generators).
Through a combination of numerical analyses and mock-up testing, Framatome concluded that PWHT of the welds in question may have been outside the required American Society of Mechanical Engineers (ASME) code limits per 10 CFR 50.55a. Using historical data, recently generated data, and analyses, Framatome conservatively demonstrated that sufficient margin to structural failure exists. Because of these results, Framatome concluded that the deviation was not a defect and not reportable under 10 CFR Part 21. Framatome is conducting additional experimental and numerical work to verify that the analysis assumptions are conservative. Any non-conservative results will be addressed through the coordination between Framatome and the affected licensees via their respective corrective action program.
Based on this meeting and a review of the Part 21 evaluation, the NRC staff concluded there is no substantial safety hazard, and Framatomes assessment is appropriate. The NRC staff will Docket No. 99901300
Enclosure:
List of Attendees CONTACT: Dong Park, NRR/DRO (301) 415-0001
ML19298C093 NRC-001 OFFICE NRR/DRO/IQVB NRR/DRO/IQVB NRR/DRO/IQVB NAME DPark PPrescott KKavanagh DATE 10/25/2019 11/4/2019 11/4/2019 List of Attendees Meeting with Framatome Regarding Evaluations of Deviations of Weld Requirements from Technical Standards October 18, 2019 Name Organization Chris Miller NRC Kerri Kavanagh NRC Paul Prescott NRC Dong Park NRC Dave Rudland NRC Kamal Manoly NRC Chakrapani Basavaraju NRC Kaihwa Hsu NRC Victor Montalbano Framatome Jeff Fleck Framatome Brian Haibach Framatome Ashok Nana Framatome Tim Wiger Framatome Gary Peters Framatome Jeff Enneking Framatome Matt Adams Dominion Marty Murphy Prairie Island Aaron Chladil Prairie Island Francois Roch Framatome Fabien Ducrozet Framatome Steve Bloom* NRC Edison Fernandez* NRC Justin Fuller* NRC Mel Gray* NRC Richard Guzman* NRC Brian Derreberry* Dominion Dave Hinspater* Dominion Marc Hall* Dominion Dana Knee* Dominion
- Participated via Conference Bridge Enclosure