ML20338A003
| ML20338A003 | |
| Person / Time | |
|---|---|
| Site: | Duane Arnold  |
| Issue date: | 12/01/2020 |
| From: | Rouse D Electric Power Research Institute |
| To: | Scott Wall NRC/NRR/DORL/LPL3 |
| Venkataraman B, NRR/DORL/LPL3, 415-2934 | |
| References | |
| Download: ML20338A003 (4) | |
Text
From:
Rouse, Deborah To:
Wall, Scott Cc:
andrew.odell@exeloncorp.com; Ronald.OLSON@nexteraenergy.com; Carter, Bob; Palm, Nathan; Williams, Steven
Subject:
BWRVIP 2020-100, Duane Arnold 288° Surveillance Capsule Test Results Report Date:
Tuesday, December 01, 2020 9:06:09 AM Attachments:
2020-100.pdf
Dear Mr. Wall,
The purpose of this message is to inform you that the subject letter BWRVIP 2020-100, Duane Arnold 288° Surveillance Capsule Test Results Report, is being transmitted to you via email.
One hard copy of the subject letter will be sent to the Document Control Desk via FedEx overnight delivery with Tracking # 772221679182.
If you have any questions on this subject, please contact Steve Williams (BWRVIP ISP Project Manager) by email at swilliams@epri.com or by telephone at 704.574.5386.
Thank you.
Debbie Rouse BWRVIP, Technical Assistant II Electric Power Research Institute 1300 West WT Harris Blvd. l Charlotte, NC 28262 Tel: 704-595-2520l Fax: 704-595-2860 Email: drouse@epri.com www.epri.com Together...Shaping the Future of Electricity
2020-100 BWR Vessel & Internals Project (BWRVIP)
(via e-mail)
December 1, 2020 Document Control Desk U. S. Nuclear Regulatory Commission 11555 Rockville Pike Rockville, MD 20852 Attention:
Subject:
Duane Arnold 288° Surveillance Capsule Test Results Report
References:
- 1. BWRVIP-86, Revision 1-A: BWR Vessel and Internals Project, Updated BWR Integrated Surveillance Program (ISP) Implementation Plan, EPRI, Palo Alto, CA: 2012. 1025144.
- 2. Letter from Tim Hanley (BWRVIP Chairman) to Mahesh Chawla, BWRVIP Docket No. 99902016 - Request for Change in the BWRVIP Integrated Surveillance Program Capsule Test Schedule to Accommodate Early Closure of the Duane Arnold Energy Center, dated May 15, 2020 (BWRVIP Letter 2019-046, NRC ADAMS Accession No. ML19137A027)
- 3. Letter from Lisa Regner (NRR Plant Licensing Branch II Chief) to Andrew McGehee, Duane Arnold Energy Center - Approval of Change in the BWRVIP Integrated Surveillance Program Capsule Test Schedule to Accommodate Early Closure (EPID-2019-LLL-0022), dated July 23, 2019 (NRC ADAM Accession No. ML19198A010)
- 4. Letter from Dean Curtland (Site Director, DAEC) to U.S Nuclear Regulatory Commission, Certification of Permanent Removal of Fuel from the Reactor Vessel for Duane Arnold Energy Center, dated October 12, 2020 (NRC ADAMS Accession No. ML20286A317)
The purpose of this letter is to request that an extension of the date to submit the Duane Arnold Energy Center (DAEC) 288° reactor pressure vessel surveillance capsule summary technical report to the NRC in accordance with 10 CFR 50 Appendix H.IV.A be granted.
BWRVIP 2020-100 2
The DAEC 288° capsule was withdrawn from the reactor on October 22, 2020 and shipped to the testing facility on November 5, 2020. The current NRC approved program plan for the BWRVIP Integrated Surveillance Program (ISP) is contained in BWRVIP-86, Revision 1-A (Reference 1). DAEC is one of the thirteen host plants in the ISP from which surveillance capsules are withdrawn and tested. As described in Reference 2, an ISP(E) capsule, which provides data for the first license extension period was originally scheduled to be withdrawn from DAEC in approximately 2027. The NRC was notified by the BWRVIP in Reference 2 that it would not be possible to withdraw and test the ISP(E) capsule in accordance with the currently approved plan in Reference 1 due to the early shutdown of DAEC.
As identified in Table 4-3 of Reference 1, ISP Test Matrix, the DAEC surveillance capsules provide representative data for the target plate materials in Brunswick Unit 1, Brunswick Unit 2, Columbia, DAEC, Limerick Unit 2, Peach Bottom Unit 3, and Susquehanna Unit 2 and for the target weld material in DAEC only. The representative plate heat contained in the DAEC capsules is B0673-1 and the representative weld is a heat of shielded metal arc weld (SMAW).
Since DAEC has ceased operation as of August 10, 2020 (Reference 4), DAEC will no longer need the data from their ISP(E) capsule. Since DAEC is the only plant that makes use of the SMAW weld heat data for a target weld material, data from the DAEC ISP(E) capsule is now only needed for the B0673-1 plate material.
The DAEC ISP(E) capsule fluence was projected to be significantly greater than 100% of the End of License Extension (EOLE) 1/4T fluence when comparted with the other target plate materials. This also demonstrates that DAEC was the limiting plant in terms of selecting the 2027 withdrawal date for the ISP(E). Early withdrawal of the DAEC ISP(E) capsule following plant closure in 2020 will result in a lower fluence than that projected for a 2027 withdrawal. As shown in Table 7-2 of Reference 1, the fluence of the capsule in 2027 was estimated to be 3.54x1018 n/cm2 (E>1MeV) while the most current DAEC fluence for the 2020 withdrawal described in Reference 2, resulted in an estimated capsule fluence of 3.04x1018 n/cm2 (E>1MeV).
Based on NRC review as described in Reference 3, the NRC staff found the change to the ISP test schedule for the early withdrawal of the DAEC ISP(E) capsule acceptable and does not impact any of the participants in the BWRVIP ISP because of the following:
- The DAEC ISP(E) capsule fluence is still expected to be greater than 100 percent of the EOLE 1/4T fluence for the six target plate materials that rely on this capsule (i.e.,
Brunswick, Units 1 and 2, Columbia, DAEC, Limerick, Unit 2, Peach Bottom, Unit 3, and Susquehanna, Unit 2), which is consistent with the results in BWRVIP-86, Revision 1-A.
- The representative SMAW heat is only applicable to DAEC and no other participants in the BWRVIP rely on the data from this representative weld heat.
BWRVIP 2020-100 3
- The data from the representative plate heat (B0673-1) is no longer necessary to support monitoring changes in the fracture toughness properties of the DAEC reactor vessel due to DAEC ceasing power operations in 2020.
The NRC staff concluded the change to the ISP test schedule for the DAEC ISP(E) capsule to be withdrawn in 2020 will not change the overall effectiveness of the ISP. Accordingly, based on DAEC having ceased power operation in August 2020 (Reference 4), the change to the ISP test schedule for the DAEC ISP(E) capsule for withdrawal in 2020 remains acceptable.
Currently, testing of the DAEC 288° capsule surveillance specimens will commence in early 2021. The BWR ISP capsule reports go through the BWRVIPs committee review process that adds 2 to 3 months to completion and publication of the capsule report. Given the current timeline, the BWRVIPs report review and approval process, and experience with prior ISP reports, submittal of the DAEC 288° capsule report cannot be completed within the 1 year requirement of 10 CFR 50 Appendix H.IV.A. Testing of the capsule contents will comply with the requirements of 10 CFR 50 Appendix H. The final report will be completed within 18 months of capsule withdrawal and transmitted to the NRC no later than April 30, 2022.
If you have any questions on this subject, please contact Steve Williams (BWRVIP ISP Project Manager) by email at swilliams@epri.com or by telephone at 704.574.5386.
Sincerely, Tim Hanley, Exelon, BWRVIP Executive Committee Chairman Nathan Palm, EPRI, BWRVIP Program Manager c:
Scott Wall, NRR Project Manager - Duane Arnold (scott.wall@nrc.gov)
A. Odell, Exelon Corp.
R. Olson, NextEra Energy Duane Arnold, LLC R. Carter, EPRI N. Palm, EPRI S. Williams, EPRI