ML17152A319

NRR E-mail Capture - 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)

ML17152A319
Person / Time
Site:	Diablo Canyon
Issue date:	06/01/2017
From:	Balwant Singal Plant Licensing Branch IV
To:	Richardson M Pacific Gas & Electric Co
References
MF9386, MF9387, MF9388, MF9389, MF9390
Download: ML17152A319 (2)

Text

NRR-PMDAPEm Resource From: Singal, Balwant Sent: Thursday, June 01, 2017 1:12 PM To: Richardson, Michael

Subject:

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)

By letter dated March 8, 2017 (Agencywide Documents Access and Management System (ADAMS) Accession Number ML17068A082), Pacific Gas and Electric Company (PG&E, the licensee) submitted the subject relief requests to the U.S. Nuclear Regulatory Commission for Diablo Canyon Power Plant, Unit 2, pursuant to Title 10 of the Code of Federal Regulations (10 CFR), Part 50, Section 50.55a(g)(5)(iii). The licensee requested to use an alternative to the requirements of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code (ASME Code) for the third ten year inservice inspection (ISI) interval, on the basis that compliance with the ASME Code is impractical for its facility. Specifically, the licensee stated that it could not inspect portions of certain ASME Code,Section XI, Examination Category B-A and B-D reactor pressure vessel welds for which the ASME Code requires 100 percent examination coverage because the component designs would not permit the access of the necessary instrumentation. The licensee further stated that it examined the maximal practically achievable volumes of the subject welds, and that these volumes are greater than those achieved for the second ten year ISI interval, for which NRC previously approved the similar relief requests. The NRC staff requires the following additional information to complete its review.

REQUEST FOR ADDITIONAL INFORMATION 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.

A copy of the Draft was provided to PG&E on May 30, 2017. Mr. Michael Richardson of PG&E confirmed on June 1, 2017 that a clarification is not required. You are requested to provide your response within 30 days from the date of this e-mail.

Please treat this e-mail as official transmittal of RAIs.

Thanks.

Balwant K. Singal Senior Project Manager (Diablo Canyon and Wolf Creek)

Nuclear Regulatory Commission Division of Operating Reactor Licensing Balwant.Singal@nrc.gov Tel: (301) 415-3016 Fax: (301) 415-1222 1

Hearing Identifier: NRR_PMDA Email Number: 3548 Mail Envelope Properties (Balwant.Singal@nrc.gov20170601131200)

Subject:

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)

Sent Date: 6/1/2017 1:12:11 PM Received Date: 6/1/2017 1:12:00 PM From: Singal, Balwant Created By: Balwant.Singal@nrc.gov Recipients:

"Richardson, Michael" <MJRm@pge.com>

Tracking Status: None Post Office:

Files Size Date & Time MESSAGE 2325 6/1/2017 1:12:00 PM Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received: ZZZ