ML15124A775

Spring 2014 Steam Generator Tube Inspection Report, Unit 1

ML15124A775
Person / Time
Site:	Catawba
Issue date:	05/05/2015
From:	Geoffrey Miller Plant Licensing Branch II
To:	Henderson K Duke Energy Carolinas
Miller G
References
TAC MF5459
Download: ML15124A775 (3)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 May*5, 2015 Mr. Kelvin Henderson Site Vice President Catawba Nuclear Station Duke Energy Carolinas, LLC

• 4800 Concord Road York, NC 297 45

SUBJECT:

CATAWBA NUCLEAR STATION, UNIT 1: SPRING 2014 STEAM GENERATOR TUBE INSPECTION REPORT, UNIT 1 (TAC NO. MF5459)

Dear Mr. Henderson,

By letter dated September 25, 2014 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML14273A440), Duke Energy Carolinas, LLC, submitted information summarizing the results of the spring 2014 steam generator (SG) tube inspections at Catawba Nuclear Station, Unit t. These inspections were performed during refueling outage 21.

The U.S. Nuclear Regulatory Commission (NRC) staff has reviewed the submittal arid determined that additional information is needed in order to complete the NRC staff's review.

Enclosure 1 describes this request for additional information (RAI). In a teleconference on April 30, 2015, Duke staff agreed to a response of 30 days from the date of this letter.

If you have any questions, please call me at 301-415-2481.

Sine~~ j

• L5bt.f //1<'-(

G. Edward Miller, Project Manager Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-413

Enclosure:

As stated cc w/encl: Distribution via Listserv

DRAFT REQUEST FOR ADDITIONAL INFORMATION CATAWBA NUCLEARSTATION. UNIT 1 SPRING 2014 STEAM GENERATOR TUBE INSPECTIONS TAC NO. MF5459 DOCKET No. 50-413 By letter dated September 25, 2014 (Agencywide Documents Access and Management System Accession No. ML14273A440) Duke Energy Carolinas, LLC (the licensee), submitted information summarizing the results of the spring 2014 steam generator (SG) tube inspections at Catawba Nuclear Station, Unit 1. These inspections were performed during refueling outage 21 (RFO 21). In order to complete its review, the U.S. Nuclear Regulatory Commission staff requests the following additional information:

1. Please discuss the scope and results of any secondary side inspections.

2. The two tubes reported to have indications greater than 20 inches from a tube support plate (TSP) are both in SG D (row 109, column 54 and row 63, column 90). Are the wear indications attributed to foreign objects? If not, please clarify the nature of the indications in these tubes and identify the tubes with foreign object wear.

3. Please confirm that the follo\ving numbers of indications \Vere identified during RFO 21:

a. 31 fan bar v.iear indications (FB) in 29 tubes and 1 TSP wear indication in 1 tube inSGA;

b. 33 FB wear indications in 22 tubes and 1 TSP wear indication in 1 tube in SG B;

c. 118 FB wear indications in 77 tubes and 2 TSP wear indications in 2 tubes in SG C; and

d. 66 FB *.vear indications in 53 tubes, 1 TSP wear indication in 1 tube, and 2 loose part wear indications in 2 tubes in SG D. 1 1

In th~ conference call dated April 30, 2015, Duke staff identified that the requested information was contained in the report. No further information is requested with respect to this question.

Enclosure

ML15124A775 *Via E-mail OFFICE NRR/LPLl-1 /PM NRR/LPL2-1/LA NRR/DE/ESGB NRR/LPL2-1/BC NRR/LPLl-1/PM NAME GEMiller SFigueroa GKulesa* RPascarelli GE Miller DATE 05/05/15 05/05/15 04/03/15 05/05/15 05/05/15