ML21036A114

NRR E-mail Capture - Request for Additional Information - Harris - Relief Request RA-20-0312 - SW Pinhole Leak (L-2020-LLR-0143)

ML21036A114
Person / Time
Site:	Harris
Issue date:	02/05/2021
From:	Michael Mahoney NRC/NRR/DORL/LPL2-2
To:	Earp D Duke Energy Progress
References
L-2020-LLR-0143
Download: ML21036A114 (4)

Text

From: Mahoney, Michael Sent: Friday, February 5, 2021 10:24 AM To: Dennis Earp (dennis.Earp@duke-energy.com)

Subject:

Request for Additional Information - Harris - Relief Request RA-20-0312 - SW Pinhole Leak (L-2020-LLR-0143)

Attachments: RAIs - Harris - Relief Request RA-20-0312 - SW Pinhole Leak (L-2020-LLR-0143).docx

Dennis, Attached are RAIs for the subject Shearon Harris Nuclear Power Plant, Unit 1 request RA 0312, dated November 4, 2020 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML20309A774), where Duke Energy Progress, LLC (the licensee) requests NRC approval to defer implementation of American Society of Mechanical Engineers (ASME) Code repairs of a through-wall leak in the Emergency Service Water (ESW) System, to no later than the next schedule refueling outage.

Please provide your response to the attached RAIs within 30 days of the date of this electronic correspondence.

Once added to ADAMS, I will provide an accession number for this electronic correspondence.

Thanks Mike Mahoney Project Manager, LPL2-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Desk: (301)-415-3867 Mobile: (301)-250-0450 Email: Michael.Mahoney@nrc.gov

Hearing Identifier: NRR_DRMA Email Number: 1003 Mail Envelope Properties (MN2PR09MB55310263F565BF34FC1B2EB8E5B29)

Subject:

Request for Additional Information - Harris - Relief Request RA-20-0312 - SW Pinhole Leak (L-2020-LLR-0143)

Sent Date: 2/5/2021 10:23:52 AM Received Date: 2/5/2021 10:23:53 AM From: Mahoney, Michael Created By: Michael.Mahoney@nrc.gov Recipients:

"Dennis Earp (dennis.Earp@duke-energy.com)" <dennis.Earp@duke-energy.com>

Tracking Status: None Post Office: MN2PR09MB5531.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 941 2/5/2021 10:23:53 AM RAIs - Harris - Relief Request RA-20-0312 - SW Pinhole Leak (L-2020-LLR-0143).docx 32382 Options Priority: Normal Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

REQUEST FOR ADDITIONAL INFORMATION REQUEST FOR ALTERNATIVE TO ASME CODE REPAIR REQUIREED BY IWA-4421 FOR SERVICE WATER PINHOLE LEAK DUKE ENERGY PROGRESS, LLC SHEARON HARRIS NUCLEAR POWER PLANT, UNIT 1 DOCKET NO. 50-400 EPID L-2020-LLR-0143

1.0 INTRODUCTION

By letter RA-20-0312, dated November 4, 2020 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML20309A774), Duke Energy Progress, LLC (the licensee) requests NRC approval to defer implementation of American Society of Mechanical Engineers (ASME) Code repairs of a through-wall leak in the Emergency Service Water (ESW) System, to no later than the next schedule refueling outage for the Shearon Harris Nuclear Power Plant, Unit 1.

During the Nuclear Regulatory Commission (NRC) staffs review of the license amendment request, the NRC staff determined that additional information was needed to complete the review.

2.0 REGULATORY BASIS In order for the NRC staff to assess the licensees flaw evaluation and confirm that structural integrity of ESW piping is maintained, in accordance with the guidance provided in NRC Generic Letter 90-05, Guidance for Performing Temporary Non-Code Repair of ASME Code Class 1, 2, and 3 Piping, the NRC staff determined that the following information is needed.

3.0 REQUEST FOR ADDITIONAL INFORMATION (RAI)

RAI- 1 On Page 3 (of 5) the request, the licensee states, in part:

A flaw diameter of 0.100 inches was used to further evaluate the defect.

Ultrasonic testing (UT) measurements indicate some wall thinning, with pipe wall thickness varying between 0.150 inch and 0.167 inches around the pipe circumference. The lowest reading obtained was 0.137 inches at the root of the socket weld.

Additionally, in Enclosure 2 of the request, the licensee states, in part:

The pipe wall thickness varies between 0.150 inches and 0.167 inches around the pipe circumference with the lowest reading measured at 0.137

inches. Since the UT measurements indicate some wall thinning, the minimum wall thickness is also calculated.

a. Does the referenced measurement range of 0.150 in (inches) to 0.167 in refer to the pipe wall thickness, which has a nominal pipe wall thickness of 0.179 in (for 1-inch schedule 80 pipe)?

b. Is the measurement of 0.137 in the thickness of the sockolet? If so, what is the nominal thickness of the sockolet, in the location of the weld?

c. Has the licensee assessed the loss of wall-thickness in the pipe, sockolet, and the return line, in the area where the sockolet is attached? Provide a basis for the determination that structural integrity is maintained.

d. From the description in the request, it appears that the flaw is at the weld/sockolet interface originating from the root area. Confirm the location of the flaw.

RAI-2

On Page 3 (of 5) the request, the licensee states, in part:

An accurate measurement of the pinhole diameter could not be obtained since the size of the pinhole leak is small (less than 1/16 inch diameter).

The area of the leak was observed dripping at approximately 1 drop per minute.

a. Describe the current state of the leakage.