Tennessee Valley Authority, Post Office Box 2000, Spring City, Tennessee 37381-2000

January 21, 201610CFR 50.55a

U.S. Nuclear Regulatory CommissionATTN; Document Control Desk

Washington, D.C. 20555-0001

Watts Bar Nuclear Plant, Unit 1Facility Operating License No. NFP-90NRC Docket No. 50-390

Subject: AMERICAN SOCIETY OF MECHANICAL ENGINEERS, SECTION XI,SECOND 10-YEAR INSPECTION INTERVAL, INSERVICE INSPECTIONOWNER'S ACTIVITY REPORT FOR CYCLE 13 OPERATION

The Tennessee Valley Authority is submitting the Watts Bar Nuclear Plant, Unit 1, AmericanSociety of Mechanical Engineers (ASME), Section XI, Owner's Activity Report for Unit 1Cycle 13 operation as required by Article IWA-6000, Section XI, Division 1. The report iscontained in the enclosure to this letter and is in accordance with the requirements of ASMECode Cases N-532-4 and N-532-5, "Repair/Replacement Activity DocumentationRequirements and Inservice Inspection Summary Report Preparation and Submission."

The report is an overview of the results from inservice examinations that were performed oncomponents within the ASME Section XI boundary, up to and including the Unit 1 Cycle 13refueling outage, during the third inspection period of the second 10-year inspection interval.The applicable provisions of the ASME Code require that this report be submitted 90 daysfrom the end of the applicable outage, i.e., by January 22, 2016.

U.S. Nuclear Regulatory CommissionPage 2January 21, 2016

There are no new regulatory commitments in this letter. Ifyou have questions regarding thisletter, please call Gordon Arent, Director of Watts Bar Site Licensing, at (423) 365-2004.

Respectfully,

Kevin T. Walsh

Site Vice President

Watts Bar Nuclear Plant

Enclosure: American Society of Mechanical Engineers, Section XI, Second 10-Yearinservice Inspection Interval, Inservice Inspection Owner's Activity Report forCycle 13 Operation

cc (Enclosure):

NRC Regional Administrator - Region IINRC Senior Resident Inspector - Watts Bar Nuclear Plant, Unit 1NRR Project Manager - Watts Bar Nuclear Plant

ENCLOSURE

TENNESSEE VALLEY AUTHORITY

WATTS BAR NUCLEAR PLANT, UNIT 1

AMERICAN SOCIETY OF MECHANICAL ENGINEERS, SECTION XI,SECOND 10-YEAR INSPECTION INTERVAL,

INSERVICE INSPECTION OWNER'S ACTIVITY REPORT

FOR CYCLE 13 OPERATION

FORM OAR-1 OWNER'S ACTIVITY REPORT

Report Number U1C13

Plant WATTS BAR NUCLEAR PLANT, P.O. Box2000, Spring City. TN 37381-2000

Unit No. 1 Commercial servicedate May 27.1996 Refueling outage no. U1C13(Ifapplicable)

Current inspection interval 2nd(r, 2"". 3™. 4", other)

Current inspection period 3rd(1« 2™ 3")

Edition and Addenda ofSection XI applicable totheinspection plans 2001 Edition. 2003 Addenda

Date and revision of inspectionplans October 23. 2015 / 1-TRI-0-10.2. Revision 14

Edition and Addenda ofSection XI applicableto repair/replacement activities, ifdifferent than the inspection plans same

Code Cases used: N-460, N-526, N-532-4, N-532-5, N-566-2, N-586-1, N-578-1, N-624, N-685. N-686-1, N-700, N-706-1,N-722-1. N-729-1. N-731. N-753. and N-770-1

CERTIFICATE OF CONFORMANCE

Icertify that (a)the statements made In this report are connect; (b)the examinations and tests meet the Inspection Plan required by

the ASME CodeXI and (c)the repair/replacement activities and evaluations supporting the completion of U1C13

conform to the requirements ofSection XI. , i ^ ; (refueling outage number)

4^ 7//V//4 owns;-. Design., /AhUcC 'J " 'O

CERTIFICATE OF INSERVICE INSPECTION

I.the undersigned, holding a valid commission issued by the National Board of Boiler and Pressure Vessel Inspectorsand employed by The Hartford Steam Boiler Inspection and Insurance Company of Connecticut of Hartford. Connecticut

have Inspectedthe itemsdescribed inthis Owner's Activity Report,and state that, to the best of myknowledge and belief, theOwner has performedallactivities represented by this report in accordance with the requirements ofSection XI.

Bysigningthiscertificate neither the Inspector nor hisemployermake any warranty, expressed or implied, concerningtherepair/replacement activities and evaluationdescribed inthis report. Furthennore, neitherthe Inspectornor his employershall beliable in manner for personal Injury or property damage or a loss of any kind arising from or connected with this inspection.

Commissions Hxl-z,National Board and Endorsements

Date VWA'o

ASME Code Section XI Exception - Reference TVA Condition Report 1124988, Subject: ASME Category B-G-1 (RPVstuds and RCP hydrastuds). Description: Using EPRI guidance, tlie performance demonstration completed for theseexams was not perfbnned as a "blindtesf as required by ASMESection XI, Appendix VIM, Supplement 8, paragraph2.0. This CR documents the issue and references the NRC-issued EGM-14-003 as sufficient technical basis foraccepting the examinations.

Page E-1 of 3

TABLE 1

ITEMS WITH FLAWS OR RELEVANT CONDITIONS THAT

REQUIRED EVALUATION FOR CONTINUED SERVICE

Examination

Category andItem Number

Item Description Evaluation Description

None None None

TAEiLE 2

ABSTRACT OF REPAIR/REPLACEMENT ACTIVITIES

REQUIRED FOR CONTINUED SERVICE

Code

Class

Item

DescriptionDescription

of Work

Date

CompletedRepair/Replacement

Plan Number

E-A

E1.30

Thermoshield,functioning as a

Containment

Moisture Barrier

Repaired gouges and other minorphysical damage incurred during

outage work in Containment

10/16/15 Work Order (WO)116640689

Page E-2 of 3

REPORTING REQUIRED BY 10 CFR 50.55a(b)(2)(ix)(A)ASME Section XI, Subsection IWE

Steel Containment Vessel Inspection Program

10 CFR 50.55a(b)(2)(ix)(A) requires reporting of the degradation assessment forinaccessible areas when conditions are identified in accessible areas during theperformance of the ASME Section XI, Subsection IWE Steel Containment Vessel (SCV)Inspection Program that could indicate the presence of, or result in, degradation to suchinaccessible areas.

The condition identified during the Unit 1 Cycle 13 refueling outage on the SCVThermoshield in an accessible area was repaired by Work Order 116640689, "Repair ofsheetmetal flashing in Reactor Building", and does not affect the degradation assessmentfor inaccessible areas. The conditions were documented in Notification of Indication

N0I-U1R13-001, and are reported in Table 2 above.

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