DCL-17-060, Response to NRC Request for Additional Information Regarding Relief Requests NDE-SLH U2, NDE-LSL U2, NDE-LHC U2, NDE-LHM U2, and NDE-ONV U2

Response to NRC Request for Additional Information Regarding Relief Requests NDE-SLH U2, NDE-LSL U2, NDE-LHC U2, NDE-LHM U2, and NDE-ONV U2

ML17172A705
Person / Time
Site:	Diablo Canyon
Issue date:	06/21/2017
From:	Welsch J Pacific Gas & Electric Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
CAC MF9386, CAC MF9387, CAC MF9388, CAC MF9389, CAC MF9390, DCL-17-060
Download: ML17172A705 (3)

Text

Pacific Gas and Electric Company James M. Welsch Diablo Canyon Power Plant Vice President, Nuclear Generation Mail Code 104/6 P. 0. Box 56 Avila Beach, CA 93424 805.545.3242 Internal: 691 .3242 June 21, 2017 Fax: 805.545.4884 PG&E Letter DCL-17 -060 U.S. Nuclear Regulatory Commission 10 CFR 50.55a ATTN: Document Control Desk Washington, DC 20555-0001 Docket No. 50-323, OL-DPR-82 Diablo Canyon Power Plant (DCPP) Unit 2 Response to NRC Request for Additional Information Regarding "Relief Requests NDE-SLH U2. NDE-LSL U2, NDE-LHC U2. NDE-LHM U2. and NDE-ONV U2"

References:

1. PG&E Letter DCL-17-017, "ASME Section Xllnservice Inspection Relief Requests NDE-RPV 10 Year 2R19," dated March 8, 2017

2. E-mail from NRC Project Manager Balwant K. Singal, "Request for Additional Information (RAI) - Relief Requests NDE-SLH U2, NDE-LSL U2, NDE-LHC U2, NDE-LHM U2, and NDE-ONV U2 (CAC Nos. MF9386 through MF9390)," dated June 1, 2017

Dear Commissioners and Staff:

In Reference 1, Pacific Gas and Electric Company (PG&E) submitted five inservice inspection (lSI) relief requests for the Diablo Canyon Power Plant Unit 2 third lSI interval for NRC approval. In Reference 2, the NRC Staff provided a request for additional information (RAI) via an e-mail, dated June 1, 2017. The Enclosure to this letter provides PG&E's response to the RAI.

• There are no new or revised regulatory commitments (as defined by NEI 99-04) in this Jetter. If you have any questions or require additional information, please contact Mr. Hossein Hamzehee at (805) 545-4720.

Sincerely,

~~~

James M. Welsch A member of the STARS Alliance Callaway

• Diablo Canyon

• Palo Verde *

• Wolf Creek

Document Control Desk PG&E Letter DCL-17 -060 June 21, 2017 Page2 rntU4231 /50926772 Enclosure cc: Diablo Distribution cc/enc: Kriss M. Kennedy, NRC Region IV Administrator Christopher W. Newport, NRC Senior Resident Inspector Gonzalo L. Perez, Branch Chief, California Department of Public Health Balwant K. Singal, NRC Project Manager State of California, Pressure Vessel Unit A member of the STARS Alliance Callaway

• Diablo Canyon

• Palo Verde*

• Wolf Creek

Enclosure PG&E Letter DCL-17 -060 PG&E Response to NRC Request for Additional Information Regarding "Relief Requests NDE-SLH U2, NDE-LSL U2, NDE-LHC U2, NDE-LHM U2, and NDE-ONV U2" NRC Question:

Please provide information on whether any significant indications were found during the ultrasonic test inspections for those portions of the welds which were examined in the Unit 2, 2R19 refueling outage. Significant indications means those exceeding the requirements of ASME Code,Section XI, Subsection IWB-3500, and necessitating plant-specific flaw evaluations.

PG&E Response:

No indications exceeding the requirements of ASME Code,Section XI, Subsection IWB-3500, which would necessitate plant-specific flaw evaluation, were found during the ultrasonic test inspections for those portions of the welds which were examined in the Unit 2 Nineteenth Refueling Outage (2R19).