IR 05000390/2019003

Integrated Inspection Report 05000390/2019003 and 05000391/2019003

ML19303A006
Person / Time
Site:	Watts Bar
Issue date:	10/30/2019
From:	Omar Lopez-Santiago Division Reactor Projects II
To:	Jim Barstow Tennessee Valley Authority
Reeder D
References
IR 2019003
Download: ML19303A006 (12)

Text

October 30, 2019

SUBJECT:

WATTS BAR NUCLEAR PLANT, UNITS 1 AND 2 - INTEGRATED INSPECTION REPORT 05000390/2019003 AND 05000391/2019003

Dear Mr. Barstow:

On September 30, 2019, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Watts Bar, Units 1 and 2. On October 17, 2019, the NRC inspectors discussed the results of this inspection with Mr. Anthony Williams and other members of your staff. The results of this inspection are documented in the enclosed report.

The NRC inspectors did not identify any finding or violation of more than minor significance.

This letter, its enclosure, and your response (if any) will be made available for public inspection and copying at http://www.nrc.gov/reading-rm/adams.html and at the NRC Public Document Room in accordance with 10 CFR 2.390, Public Inspections, Exemptions, Requests for Withholding.

Sincerely,

/RA/

Omar R. López-Santiago, Chief Reactor Projects Branch 5 Division of Reactor Projects

Docket Nos. 05000390 and 05000391 License Nos. NPF-90 and NPF-96

Enclosure:

As stated

Inspection Report

Docket Numbers:

05000390 and 05000391

License Numbers:

NPF-90 and NPF-96

Report Numbers:

05000390/2019003 and 05000391/2019003

Enterprise Identifier:

I-2019-003-0024

Licensee:

Tennessee Valley Authority

Facility:

Watts Bar, Units 1 and 2

Location:

Spring City, TN 37381

Inspection Dates:

July 01, 2019 to September 30, 2019

Inspectors:

N. Childs, Senior Resident Inspector

W. Deschaine, Senior Resident Inspector

J. Hamman, Resident Inspector

S. Janicki, Resident Inspector

R. Mathis, Test Inspector

J. Nadel, Senior Resident Inspector

Approved By:

Omar R. López-Santiago, Chief

Reactor Projects Branch 5

Division of Reactor Projects

SUMMARY

The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting an integrated inspection at Watts Bar, Units 1 and 2 in accordance with the Reactor Oversight Process. The Reactor Oversight Process is the NRCs program for overseeing the safe operation of commercial nuclear power reactors. Refer to https://www.nrc.gov/reactors/operating/oversight.html for more information.

List of Findings and Violations

No findings or violations of more than minor significance were identified.

Additional Tracking Items

None.

PLANT STATUS

Unit 1 began the inspection period at rated thermal power. On August 31, 2019, the unit was manually tripped due to a main feedwater regulating valve (MFRV) failure. Repairs were made to the MFRV and on September 3, 2019, the unit reached 12%. On September 5, 2019, the licensee noted some turbine repairs that were necessary and shutdown the unit. The unit remained offline for the remainder of the inspection period.

Unit 2 operated at or near rated thermal power for the entire inspection period.

INSPECTION SCOPES

Inspections were conducted using the appropriate portions of the inspection procedures (IPs) in effect at the beginning of the inspection unless otherwise noted. Currently approved IPs with their attached revision histories are located on the public website at http://www.nrc.gov/reading-rm/doc-collections/insp-manual/inspection-procedure/index.html. Samples were declared complete when the IP requirements most appropriate to the inspection activity were met consistent with Inspection Manual Chapter (IMC) 2515, Light-Water Reactor Inspection Program - Operations Phase. The inspectors performed plant status activities described in IMC 2515 Appendix D, Plant Status and conducted routine reviews using IP 71152, Problem Identification and Resolution. The inspectors reviewed selected procedures and records, observed activities, and interviewed personnel to assess licensee performance and compliance with Commission rules and regulations, license conditions, site procedures, and standards.

71111.04Q - Equipment Alignment

Partial Walkdown Sample (IP Section 03.01) (4 Samples)

The inspectors evaluated system configurations during partial walkdowns of the following systems/trains:

(1)1B train charging system while 1A centrifugal charging pump (CCP) was out of service (OOS) for a component outage on July 8, 2019 (2)2B train of containment spray while 2A train was OOS for planned maintenance on July 9, 2019 (3)1A-A emergency diesel generator (EDG) while 1B-B EDG was OOS for planned maintenance (4)1A, 1B and 2A 480V electric board room (EBR) chillers while 2B EBR chiller was OOS for repairs on August 22, 2019

71111.05A - Fire Protection (Annual)

Annual Inspection (IP Section 03.02) (1 Sample)

(1) Inspectors observed an announced fire drill for a fire in the 1B-B containment spray pump room on August 14, 2019.

71111.05Q - Fire Protection

Quarterly Inspection (IP Section 03.01) (1 Sample)

The inspectors evaluated fire protection program implementation in the following selected areas:

(1) Control building elevation 741', Unit 1 and 2 cable spreading rooms on August 20, 2019.

71111.06 - Flood Protection Measures

Inspection Activities - Internal Flooding (IP Section 02.02a.) (1 Sample)

The inspectors evaluated internal flooding mitigation protections in the:

(1) Unit 1 and 2 auxiliary building elevation 757', shutdown board rooms

71111.11Q - Licensed Operator Requalification Program and Licensed Operator Performance

Licensed Operator Performance in the Actual Plant/Main Control Room (IP Section 03.01) (1 Sample)

(1) The inspectors observed and evaluated licensed operator performance in the Control Room during a Unit 1 start-up following a forced outage due to the failure of the #2 main feedwater regulating valve on September 2, 2019.

Licensed Operator Requalification Training/Examinations (IP Section 03.02) (1 Sample)

(1) The inspectors observed simulator scenario 3-OT-SRT-H1-6, Revision 2, for a loss of ultimate heat sink following a rapid load reduction due to high turbine bearing temperature on September 19, 2019.

71111.12 - Maintenance Effectiveness

Routine Maintenance Effectiveness Inspection (IP Section 02.01) (1 Sample)

The inspectors evaluated the effectiveness of routine maintenance activities associated with the following equipment and/or safety significant functions:

(1) Condition Report (CR) 1526540, A and B Emergency Gas Treatment System functional failure due to a tear in penetration seal 0-SLV-304-R2S065

71111.13 - Maintenance Risk Assessments and Emergent Work Control

Risk Assessment and Management Sample (IP Section 03.01) (4 Samples)

The inspectors evaluated the risk assessments for the following planned and emergent work activities:

(1) Risk assessment for week of August 12, 2019 with 1B-B emergency diesel generator OOS for planned maintenance

(2) Risk assessment for August 29, 2019, with the 2B-B emergency diesel generator OOS for planned maintenance

(3) Risk assessment for September 9, 2019, with Unit 1 shutdown for a forced outage

(4) Risk assessment for September 25, 2019 with 2B-B emergency diesel generator OOS due to load swings during a surveillance

71111.15 - Operability Determinations and Functionality Assessments

Operability Determination or Functionality Assessment (IP Section 02.02) (2 Samples)

The inspectors evaluated the following operability determinations and functionality assessments:

(1) Operability determination for CR 1539213, auxiliary building gas treatment system 1A-A fan motor high vibrations

(2) Operability determination for CR 1534088, Engineering Work Request EWR-19-ELE-030-284, low margin to maximum limit for Unit 1 lower containment temperature.

71111.18 - Plant Modifications

Temporary Modifications and/or Permanent Modifications (IP Section 03.01 and/or 03.02) (1 Sample)

The inspectors evaluated the following temporary or permanent modifications:

(1) Temporary Modification WBN-0-2019-031-004, temporary chillers installed to provide chilled water to the B-B shutdown board room chiller loads on August 22, 2019

71111.19 - Post-Maintenance Testing

Post-Maintenance Test Sample (IP Section 03.01) (2 Samples)

The inspectors evaluated the following post maintenance tests:

(1) Post maintenance test of 1A-A auxiliary building gas treatment system exhaust fan motor after preventive maintenance on August 8, 2019

(2) WO 120614655, 0-SI-82-12-B, Monthly Diesel Start and Load Test DG 2B-B, following 2B-B emergency diesel generator repairs on September 25, 2019

71111.22 - Surveillance Testing

The inspectors evaluated the following surveillance tests:

Inservice Testing (IP Section 03.01)

(1) Work Order (WO) 120163013, 1-SI-3-901-B, Motor Driven Auxiliary Feedwater Pump 1B-B Quarterly Performance Test on August 2,

OTHER ACTIVITIES - BASELINE

===71151 - Performance Indicator Verification

The inspectors verified licensee performance indicators submittals listed below:

MS05: Safety System Functional Failures (SSFFs) Sample (IP Section 02.04)===

(1) Unit 1 (July 1, 2018 - June 30, 2019)

(2) Unit 2 (July 1, 2018 - June 30, 2019)

MS07: High Pressure Injection Systems (IP Section 02.06) (2 Samples)

(1) Unit 1 (July 1, 2018 - June 30, 2019)

(2) Unit 2 (July 1, 2018 - June 30, 2019)

MS10: Cooling Water Support Systems (IP Section 02.09) (2 Samples)

(1) Unit 1 (July 1, 2018 - June 30, 2019)

(2) Unit 2 (July 1, 2018 - June 30, 2019)

BI02: RCS Leak Rate Sample (IP Section 02.11) (2 Samples)

(1) Unit 1 (July 1, 2018 - June 30, 2019)

(2) Unit 2 (July 1, 2018 - June 30, 2019)

71152 - Problem Identification and Resolution

Semiannual Trend Review (IP Section 02.02) (1 Sample)

(1) The inspectors reviewed the licensees corrective action program for trends that might be indicative of a more safety significant issue.

Annual Follow-up of Selected Issues (IP Section 02.03) (1 Sample)

The inspectors reviewed the licensees implementation of its corrective action program related to the following issues:

(1) The inspectors conducted safety culture interviews in the Watts Bar Site Projects organization as a result of several safety culture related condition reports. The inspectors concluded that individuals in the Watts Bar Site Projects organization understood the various methods of reporting safety concerns and were willing to use them without fear of retaliation.

INSPECTION RESULTS

Observation: Review of Condition Reports Related to Tritium Production in Unit 1 Reactor 71152 During their regular review of the licensees corrective action program, the inspectors identified eleven condition reports written between February and September 2019 relating to tritium production using tritium producing burnable absorber rods (TPBAR) in the Unit 1 reactor. The inspectors evaluated this as a possible trend. The technical issues described in ten of the condition reports had insignificant impact on plant operations. Condition report 1521541, related to airborne tritium concentration in lower containment, received a detailed review by the inspectors. Specifically, increased tritium concentration in unit 1 reactor coolant sometimes resulted in increased airborne tritium in lower containment. This is because reactor coolant is collected in the reactor building equipment drain system, which is open to the lower containment atmosphere, and is present in the reactor coolant drain tank, which is vented to the lower containment atmosphere. The inspectors found that the licensee had procedures in place to monitor lower containment tritium concentrations and to ensure protection for personnel working in lower containment. Additionally, the licensee monitored gaseous releases from Unit 1 containment to ensure that those releases are below regulatory requirements. Overall, the inspectors concluded that none of the condition reports reviewed were indicative of a more significant safety issue.

EXIT MEETINGS AND DEBRIEFS

The inspectors verified no proprietary information was retained or documented in this report.

• On October 17, 2019, the inspectors presented the integrated inspection results to Mr.

Anthony Williams and other members of the licensee staff.

DOCUMENTS REVIEWED

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

71111.04Q Drawings

2-47W812-1

Miscellaneous

SDD-N3-30AB-

4001

Auxiliary Building Heating, Ventilation, Air Conditioning

System (30, 31, 44) Unit1/Unit 2

Procedures

0-SI-82-2

Hour Diesel Generator AC Power Source Operability

Verification

1-PI-OPS-PE

Protection Equipment

2-PI-OPS-1-PE

Protected Equipment

71111.05A

Fire Plans

AUX-0-676-01

WBN Prefire Plan

Miscellaneous

Watts Bar Nuclear Plant Fire Protection Report

71111.05Q Corrective Action

Documents

CR

1542582

Fire Plans

CON-0-729-01

Pre-Fire Plan

71111.06

Calculations

Flooding Calculation WBN0SG4009, Appendix J, Backflow

Through Floor Drains

09/25/1987

MDN-000-999-

2008-0146

WBN Probabilistic Risk Assessment - Internal Flooding

Analysis Notebook

WBN-DC-40-

31.51

Evaluating the Effects of Flooding due to Moderate Energy

Pipe Failures Inside and Outside of Containment

WBN-DC-40-61

Equipment and Floor Draining System

Corrective Action

Documents

CR

1542885, 1539120

71111.11Q Corrective Action

Documents

CR

26540

Miscellaneous

1-GO-2

Reactor Startup

1646, 1647

Cause Determination Evaluation

Procedures

0-TI-119

Maintenance Rule Performance Indicator Monitoring,

Trending, and Reporting - 10CFR50.65

Work Orders

20536836

71111.13

Miscellaneous

Operator's Risk Report

08/12/2019

WBN Defense in Depth Assessment

09/09/2019

Operator's Risk Report

09/25/2018

Procedures

0-SI-82-2

Hour Diesel Generator AC Power Source Operability

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

Verification

71111.15

Corrective Action

Documents

CR

1534088, 1535612, 1536108, 1539213

Miscellaneous

EWR-19-ELE-

030-284

Evaluate the impact of one or more failed temperature

sensors on the determination of the average lower

containment temperature for WBN 1

07/23/2019

Procedures

0-TI-31.02

Plant Equipment Monitoring & Vibration Diagnostics

Program

1-T-30-210

Setpoint and Scaling Document

NEDP-10,

Site Engineering Setpoint and Scaling Documents

NEDP-2

Safety/Quality-Related Setpoint Establishment and

Validation Process

NEDP-4,

Quality-related Processes-Augmented QA

NPG-SPP-06.7

Instrumentation Setpoint, Scaling, and Calibration Program

NPG-SPP-09.0

Conduct of Engineering

Work Orders

119904284

71111.18

Miscellaneous

C19-0447, C19-

0454

Fire Protection Impairment Permit

WBN-0-2019-

031-004

Temporary Chiller to Support Replacement of B-Train

Shutdown Board Room (SDBR) Chiller

71111.19

Corrective Action

Documents

CR

1539213

Procedures

0-SI-82-12-B

Monthly Diesel Start and Load Test B2-B

0-TI-31.02

Plant Equipment Monitoring & Vibration Diagnostics

Program

Work Orders

119904284

71111.22

Procedures

1-SI-3-901-B

Motor Driven Auxiliary Feedwater Pump 1B-B Quarterly

Performance Test

71152

Corrective Action

Documents

1494503,

21541,

22992,

24508,

Condition Reports

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

26913,

29480,

1531261,

1533009,

1549445,

1549467,

1549912