ML17031A035
| ML17031A035 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 01/26/2017 |
| From: | Richard Guzman Plant Licensing Branch 1 |
| To: | Craft W Dominion Nuclear Connecticut |
| Guzman R | |
| References | |
| TAC MF7761 | |
| Download: ML17031A035 (2) | |
Text
From:
Guzman, Richard Sent:
Thursday, January 26, 2017 10:02 AM To:
'Wanda D Craft (Generation - 6)'
Subject:
RE: Summary of Jan. 18, 2017 Discussion with Dominion, AREVA and the NRC on MPS2 RLBLOCA
- Wanda, Thanks for the summary provided in your message below. As discussed during the mentioned January 18 teleconference, the NRC staff appreciates the licensee bringing the identified error to our attention. We understand the information passed by the licensee and AREVA is still preliminary. The staff considered the information in its review of the associated application, and deemed that the error, as characterized by the licensee on the call, do not have any significant impact on the staffs safety conclusion. As concluded by the NRC staff in the safety evaluation for Amendment No. 332 dated January 24, 2017, there is reasonable assurance that the activities proposed in the LAR will be conducted in compliance with the Commission's regulations and without endangering the health and safety of the public.
~~~~~~~~~
Rich Guzman Sr. PM, Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Office: O-8E10 l Phone: 301-415-1030 From: Wanda D Craft (Generation - 6) [1]
Sent: Thursday, January 19, 2017 4:09 PM To: Guzman, Richard <Richard.Guzman@nrc.gov>
Subject:
[External_Sender] Summary of Jan. 18, 2017 Discussion with Dominion, AREVA and the NRC on MPS2 RLBLOCA Dominion AREVA NRC Dana Knee Elisa Calvo Tone Josh Borromeo Lauren Lopez Andrei Burghelea Rich Guzman Dave Bajumpaa Jerry Holm Brian Mount Rick Williamson Brian Vitiello Gabby Westerlind Jeff Langan Craig sly Wanda Craft On May 25, 2016, Dominion Nuclear Connecticut (DNC) submitted a license amendment request (LAR) for Millstone Power Station Unit 2 (MPS2) that proposed to add the AREVA topical report EMF-2103(P)(A), Realistic Large Break Loss of Coolant Accident (RLBLOCA) Methodology for Pressurized
Water Reactors to Technical Specification 6.9.1.8.b, Core Operating Limits Report, which lists the analytical methods used to determine the core operating limits. The LAR is in NRC review.
On January 18, 2017, DNC notified the NRC by telecon that AREVA had identified a minor error in the MPS2 RLBLOCA analysis. This email is a summary of the teleconference where preliminary information was shared with the NRC staff.
EMF-2103(P)(A), Revision 3, page A-32, provides proprietary guidance on the treatment of the form loss coefficient in the hot leg internal junctions. It was discovered that the MPS2 model deviates from the guidance. The specific deviation and the scope of error evaluation to determine the impact were explained to the NRC staff on January 18. The preliminary estimated effect is 0°F on the proposed analysis of record peak cladding temperature of 1615°F that was documented in the LAR dated May 25, 2016.
After formal evaluation by AREVA in accordance with their quality assurance program and notification to MPS2, DNC will follow the process for reporting errors and changes to ECCS Evaluation Models per the requirements of 10 CFR 50.46(a)(3)(iii).
Wanda D. Craft Nuclear Regulatory Affairs Dominion Resources Services, Inc (804) 273-4687 tie-line 730-4687 CONFIDENTIALITY NOTICE: This electronic message contains information which may be legally confidential and or privileged and does not in any case represent a firm ENERGY COMMODITY bid or offer relating thereto which binds the sender without an additional express written confirmation to that effect. The information is intended solely for the individual or entity named above and access by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution, or use of the contents of this information is prohibited and may be unlawful. If you have received this electronic transmission in error, please reply immediately to the sender that you have received the message in error, and delete it. Thank you.