ML19329A023

Summary of October 29, 2019 Conference Call with Duke Energy Progress, LLC Regarding the Fall 2019 Steam Generator Tube Inspections

ML19329A023
Person / Time
Site:	Harris
Issue date:	11/27/2019
From:	Tanya Hood Plant Licensing Branch II
To:	Hamilton T Duke Energy Progress
Hood, T
References
EPID L-2019-LRO-0078
Download: ML19329A023 (5)

Text

November 27, 2019 Ms. Tanya M. Hamilton Site Vice President Shearon Harris Nuclear Power Plant Mail Code NHP01 5413 Shearon Harris Road New Hill, NC 27562-9300

SUBJECT:

SHEARON HARRIS NUCLEAR POWER PLANT, UNIT 1 -

SUMMARY

OF OCTOBER 29, 2019 CONFERENCE CALL WITH DUKE ENERGY PROGRESS, LLC REGARDING THE FALL 2019 STEAM GENERATOR TUBE INSPECTIONS (EPID L-2019-LRO-0078)

Dear Ms. Hamilton:

On October 29, 2019, the U.S. Nuclear Regulatory Commission staff participated in a conference call with representatives of Duke Energy Progress, LLC regarding the ongoing steam generator tube inspection activities at Shearon Harris Nuclear Power Plant during refueling outage 22. A list of participants is provided as Enclosure 1. A summary of the conference call is provided as Enclosure 2.

If you have any questions, please contact me at 301-415-1387 or Tanya.Hood@nrc.gov.

Sincerely,

/RA/

Tanya E. Hood, Project Manager Plant Licensing Branch II-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-400

Enclosure:

1. List of Participants

2. Conference Call Summary cc: Listserv

LIST OF ATTENDEES OCTOBER 29, 2019, CONFERENCE CALL WITH DUKE ENERGY PROGRESS, LLC SHEARON HARRIS NUCLEAR POWER PLANT, UNIT 1 FALL 2019 STEAM GENERATOR INSPECTIONS Name Organization Tanya E. Hood U.S. Nuclear Regulatory Commission (NRC)

Alan T. Huynh NRC Andrew Johnson NRC Paul Klein NRC Gregory Makar NRC Chuck Cauthen Duke Energy Progress, LLC (Duke Energy)

Michael Classe Duke Energy Dennis C. Earp, Jr. Duke Energy Etienne Fonteneau Duke Energy Steven Fox Duke Energy Dan Mayes Duke Energy Sarah McDaniel Duke Energy Tim A. Thulien Duke Energy Lance Wooldridge Duke Energy Enclosure 1

SUMMARY

OF OCTOBER 29, 2019, CONFERENCE CALL DUKE ENERGY PROGRESS, LLC SHEARON HARRIS NUCLEAR POWER PLANT, UNIT 1 FALL 2019 STEAM GENERATOR INSPECTIONS DOCKET NO. 50-400 On October 29, 2019, the U.S. Nuclear Regulatory Commission (NRC) staff participated in a conference call with Duke Energy Progress, LLC (the licensee), regarding the ongoing steam generator (SG) tube inspection activities at Shearon Harris Nuclear Power Plant (Harris) during refueling outage (RFO) 22.

The three Westinghouse D75 SGs at Harris were installed in 2001 during RFO 10. Each SG has 6,307 thermally treated Alloy 690 tubes with a nominal outside diameter of 0.688 inches and a nominal wall thickness of 0.040 inches. The tubes were hydraulically expanded at each end for the full depth of the tubesheet. The tubes are supported by a number of stainless steel tube support plates (TSPs) with trifoil-shaped holes. Below the TSPs is a flow distribution baffle plate that has octafoil-shaped holes. The tubes in rows 1 through 17 (i.e., those with a bend radius less than 12 inches) received a supplemental thermal treatment (stress relief) after bending.

Information provided by the licensee during the conference call is summarized below:

No indications of primary-to-secondary leakage were observed during the recently completed cycle. No secondary side pressure tests were performed during the outage.

No exceptions were taken to the industry guidelines. No in-situ pressure tests or tube pulls were planned. No tubes were planned for plugging during the outage.

Inspections were performed in all three SGs. At the time of the call, the licensee stated that the inspections were 100 percent complete. The scope of the inspections included:

o 100 percent full length bobbin probe examinations in all tubes o Array probe examinations 5 tubes deep around the periphery of the tube bundle and the no-tube lane o Array probe examinations at special interest locations (e.g., new and historic indications) o Visual inspections of installed tube plugs and all clad surfaces in the primary bowl The licensee identified the following TSP wear indications: 6 indications in 4 tubes in SG A, 4 indications in 4 tubes in SG B, and 4 indications in 4 tubes in SG C. The maximum depths were identified as 17, 21, and 18 percent through-wall in SGs A, B, and C, respectively.

The licensee performed foreign object search and retrieval inspections in all three SGs.

In SG A, 2 legacy parts were identified, 1 new part was identified and retrieved, and array probe inspections identified no tube wear from these parts. In SG B, 1 legacy part Enclosure 2

was identified and left in service and no tube wear was identified. In SG C, no loose parts were identified.

Sludge lancing was performed in all three SGs with 13, 10, and 35 pounds of sludge removed from SGs A, B, and C, respectively. Visual inspections in the annulus region and upper tube bundle revealed minimal deposits. The licensee clarified that chemical cleaning has never been performed on these SGs.

The NRC staff did not identify any issues that required follow-up action at this time.

ML19329A023 by e-mail NRC -001 OFFICE DORL/LPL2-2/PM DORL/LPL2-2/LA DNRL/NCSG/BC* DORL/LPL2-2/BC DORL/LPL2-2/PM NAME THood BAbeywickrama SBloom UShoop THood DATE 11/22/2019 11/22/2019 11/13/2019 11/26/2019 11/27/2019