ML20021A317

NRR E-mail Capture - Palo Verde Nuclear Generating Station, Unit 1 - Official RAIs for Relief Request 64, Impractical Examinations for the Third 10-Year ISI Interval

ML20021A317
Person / Time
Site:	Palo Verde
Issue date:	01/21/2020
From:	Siva Lingam NRC/NRR/DORL/LPL4
To:	Cox M Arizona Public Service Co
References
L-2019-LLR-0068
Download: ML20021A317 (3)

Text

From: Lingam, Siva Sent: Tuesday, January 21, 2020 2:12 PM To: Matthew.Cox@aps.com Cc: Dixon-Herrity, Jennifer; Gonzalez, Hipo; Benson, Michael; Dijamco, David; Reed, Tim; Michael.Dilorenzo@aps.com; Carl.Stephenson@aps.com; Nawaporn.AaronsCooke@aps.com

Subject:

Palo Verde Nuclear Generating Station, Unit 1 - Official RAIs for Relief Request 64, Impractical Examinations for the Third 10-Year ISI Interval (EPID L-2019-LLR-0068)

By letter dated July 17, 2019 (Agencywide Documents Access and Management System Accession No. ML19198A340), Arizona Public Service Company (APS, the licensee) submitted relief request (RR)-64, seeking relief from the requirements of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code,Section XI, 2001 Edition through the 2003 Addenda for the third 10-year interval for the In-Service Inspection (ISI) Program for Palo Verde Nuclear Generating Station (Palo Verde), Unit 1. APS has determined that compliance with the Code requirements of achieving essentially 100 percent coverage of the welds listed in Table 1 of this RR is impractical for Palo Verde, Unit 1. In accordance with Title 10 of the Code of Federal Regulations, Part 50 (10 CFR 50), Section 50.55a(g)(5)(iii), ISI Program Update:

Notification of Impractical ISI Code Requirements, this RR is based on actual demonstrated limitations when attempting to comply with the Code requirements in the performance of the examinations listed in Table 1 of this RR. APS also provided the reasons for which field demonstrations are considered impractical for the welds listed in Table 2 of this RR.

The NRC staff has reviewed your application and concluded that additional information is required for complete evaluation. We transmitted the draft requests for additional information (RAIs) for the subject RR on January 6, 2020, and at your request, held a clarification call on January 21, 2020. Attached please find the official RAIs from the U.S. Nuclear Regulatory Commission (NRC) staff for the subject RR, and provide your responses within 30 days from the date of this e-mail, as mutually agreed during the clarification call. Your timely responses will allow the NRC staff to complete its review on schedule.

1. The licensee described the examination coverage achieved for all the welds referenced in RR-64. However, the license did not provide information on results of the limited-coverage examinations in the third 10-year ISI interval. Information on examination results for the referenced welds, including the disposition of any found indications in accordance with ASME Section XI requirements, is relevant to the safety case for this RR. Please provide a written description of the third-interval examination results for the welds referenced in RR-64, including disposition of found indications. Examination results from the first and/or second 10-year ISI intervals may also be included, if deemed relevant by the licensee.

2. In the description for Category B-A welds, the licensee states that the inlet and outlet nozzles interfere with examination of weld 1-10 above and below the weld. However, Location Figure 1-1 indicates that the inlet and outlet nozzles may interfere only from below the weld. Please clarify the access limitations for weld 1-10.

Siva P. Lingam U.S. Nuclear Regulatory Commission

Project Manager Palo Verde Nuclear Generating Station, Units 1, 2, and 3 Grand Gulf Nuclear Station Entergy Fleet Location: O-9E22; Mail Stop: O-9E03 Telephone: 301-415-1564 E-mail address: Siva.Lingam@nrc.gov

Hearing Identifier: NRR_DRMA Email Number: 405 Mail Envelope Properties (MN2PR09MB5161FCB202C12017B45737DEF60D0)

Subject:

Palo Verde Nuclear Generating Station, Unit 1 - Official RAIs for Relief Request 64, Impractical Examinations for the Third 10-Year ISI Interval (EPID L-2019-LLR-0068)

Sent Date: 1/21/2020 2:12:03 PM Received Date: 1/21/2020 2:12:00 PM From: Lingam, Siva Created By: Siva.Lingam@nrc.gov Recipients:

"Dixon-Herrity, Jennifer" <Jennifer.Dixon-Herrity@nrc.gov>

Tracking Status: None "Gonzalez, Hipo" <Hipolito.Gonzalez@nrc.gov>

Tracking Status: None "Benson, Michael" <Michael.Benson@nrc.gov>

Tracking Status: None "Dijamco, David" <David.Dijamco@nrc.gov>

Tracking Status: None "Reed, Tim" <Timothy.Reed@nrc.gov>

Tracking Status: None "Michael.Dilorenzo@aps.com" <Michael.Dilorenzo@aps.com>

Tracking Status: None "Carl.Stephenson@aps.com" <Carl.Stephenson@aps.com>

Tracking Status: None "Nawaporn.AaronsCooke@aps.com" <Nawaporn.AaronsCooke@aps.com>

Tracking Status: None "Matthew.Cox@aps.com" <Matthew.Cox@aps.com>

Tracking Status: None Post Office: MN2PR09MB5161.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 3225 1/21/2020 2:12:00 PM Options Priority: Normal Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date: