IR 05000327/2020002

Integrated Inspection Report 05000327/2020002 and 05000328/2020002

ML20206K813
Person / Time
Site:	Sequoyah
Issue date:	07/23/2020
From:	Tom Stephen Division Reactor Projects II
To:	Jim Barstow Tennessee Valley Authority
References
IR 2020002
Download: ML20206K813 (15)

Text

July 23, 2020

SUBJECT:

SEQUOYAH, UNITS 1 AND 2 - INTEGRATED INSPECTION REPORT 05000327/2020002 AND 05000328/2020002

Dear Mr. Barstow:

On June 30, 2020, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Sequoyah, Units 1 and 2. On July 6, 2020, the NRC inspectors discussed the results of this inspection with Mr. Matt Rasmussen and other members of your staff. The results of this inspection are documented in the enclosed report.

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

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 Title 10 of the Code of Federal Regulations 2.390, Public Inspections, Exemptions, Requests for Withholding.

Sincerely,

/RA/

Thomas A. Stephen, Chief Reactor Projects Branch 5 Division of Reactor Projects Docket Nos. 05000327 and 05000328 License Nos. DPR-77 and DPR-79

Enclosure:

As stated

Inspection Report

Docket Numbers: 05000327 and 05000328 License Numbers: DPR-77 and DPR-79 Report Numbers: 05000327/2020002 and 05000328/2020002 Enterprise Identifier: I-2020-002-0064 Licensee: Tennessee Valley Authority Facility: Sequoyah, Units 1 and 2 Location: Soddy Daisy, TN 37379 Inspection Dates: April 1, 2020 to June 30, 2020 Inspectors: N. Childs, Resident Inspector P. Cooper, Reactor Inspector J. Diaz-Velez, Senior Health Physicist D. Hardage, Senior Resident Inspector J. Rivera, Health Physicist Approved By: Thomas A. Stephen, Chief Reactor Projects Branch 5 Division of Reactor Projects Enclosure

SUMMARY

The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting an integrated inspection at Sequoyah, 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

Type Issue Number Title Report Section Status LER 05000327,05000328/20 LER 2019-004-00 for 71153 Closed 19-004-00 Sequoyah, Unit 1, Automatic Actuation of Emergency Diesel Generators Due to Loss of Power to 6.9kV Shutdown Board

PLANT STATUS

Unit 1 began the inspection period at 100 percent rated thermal power (RTP). On May 13, a turbine governor control system malfunction caused lowering main steam header pressure which initiated an automatic safety injection and reactor trip. The unit was returned to 100 percent RTP on May 17 and remained at or near 100 percent RTP for the remainder of the inspection period.

Unit 2 began the inspection period at 87 percent RTP due to end of life coastdown conditions.

On April 11, the unit was shutdown for refueling. The unit was returned to 100 percent RTP on May 5 and remained at or near 100 percent RTP for the remainder of the 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 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.

Starting on March 20, 2020, in response to the National Emergency declared by the President of the United States on the public health risks of the coronavirus (COVID-19), resident inspectors were directed to begin telework and to remotely access licensee information using available technology. During this time the resident inspectors performed periodic site visits each week and during that time conducted plant status activities as described in IMC 2515, Appendix D; observed risk significant activities; and completed on site portions of IPs. In addition, resident and regional baseline inspections were evaluated to determine if all or portion of the objectives and requirements stated in the IP could be performed remotely. If the inspections could be performed remotely, they were conducted per the applicable IP. In some cases, portions of an IP were completed remotely and on site. The inspections documented below met the objectives and requirements for completion of the IP.

71111.04 - Equipment Alignment

Partial Walkdown Sample (IP Section 03.01) (3 Samples)

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

(1) Unit 2 residual heat removal system with both trains in service for cooldown in Mode 5 with reactor coolant system level below the flange on April 13, 2020.

(2) 2A emergency diesel generator following station blackout testing on April 20, 2020.

(3) Unit 2 residual heat removal system after realignment for low head injection following refueling outage on May 4, 2020.

Complete Walkdown Sample (IP Section 03.02) (1 Sample)

(1) The inspectors evaluated system configurations during a complete walkdown of the Unit 1 and Unit 2 Motor Driven Auxiliary Feedwater (AFW) on June 18 and June 25, 2020.

71111.05 - Fire Protection

Fire Area Walkdown and Inspection Sample (IP Section 03.01) (5 Samples)

The inspectors evaluated the implementation of the fire protection program by conducting a walkdown and performing a review to verify program compliance, equipment functionality, material condition, and operational readiness of the following fire areas:

(1) Emergency Raw Cooling Water Building on April 6, 2020

(2) Diesel Generator Building, Elevation 740.5 on April 20, 2020

(3) Unit 1 and Unit 2 Auxiliary Building, Elevation 653 on May 4, 2020

(4) Unit 1 and Unit 2 Control Building, Elevation 706 on May 21, 2020

(5) Unit 2 Auxiliary Building (Non-RCA), Elevation 734 on May 21, 2020

Fire Brigade Drill Performance Sample (IP Section 03.02) (1 Sample)

(1) The inspectors evaluated fire brigade performance on June 11, 2020.

71111.08P - Inservice Inspection Activities (PWR) PWR Inservice Inspection Activities Sample (IP Section 03.01)

(1) The inspectors verified that the reactor coolant system boundary, steam generator tubes, reactor vessel internals, risk-significant piping system boundaries, and containment boundary are appropriately monitored for degradation and that repairs and replacements were appropriately fabricated, examined and accepted by reviewing the following activities:

03.01.a - Nondestructive Examination and Welding Activities.

• Ultrasonic Examination (UT), 3" Valve to Elbow, CVCF-213 , ASME Class 1, WO#119449412 (reviewed)

• Liquid Penetrant Examination (PT), 1" Pipe to Branch Connection, 2-FD-1609C4R0, ASME Class 2, weld package, WO#118769371 (reviewed)

• Enhanced Remote Visual (VE), RPV Closure Head and CRDM Penetration, WO#119809141. (reviewed)03.01.c - Pressurized-Water Reactor Boric Acid Corrosion Control Activities.

• Evaluation of 2-FCV-063-0158

71111.11Q - Licensed Operator Requalification Program and Licensed Operator Performance

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

(1) The inspectors observed and evaluated a simulator training scenario on June 8, 2020.

71111.12 - Maintenance Effectiveness

Maintenance Effectiveness (IP Section 03.01) (2 Samples)

The inspectors evaluated the effectiveness of maintenance to ensure the following structures, systems, and components (SSCs) remain capable of performing their intended function:

(1) Part 21 Eval KCR-07 Battery Container Failure SQN Named (CR 1589441) .

(2) 2-FCV-007-0003 Turbine Startup Drain Line Steam Break Failures (CR 1303568).

Quality Control (IP Section 03.02) (1 Sample)

The inspectors evaluated maintenance and quality control activities associated with the following equipment performance activity:

(1) Quality critical maintenance to replace volume control tank (VCT) pressure transmitter 2-PT-62-122 (WO 120428331).

71111.13 - Maintenance Risk Assessments and Emergent Work Control

Risk Assessment and Management Sample (IP Section 03.01) (3 Samples)

The inspectors evaluated the accuracy and completeness of risk assessments for the following planned and emergent work activities to ensure configuration changes and appropriate work controls were addressed;

(1) Unit 1 and 2, week of April 5 - April 10 including protected equipment status reviews for scheduled maintenance on Unit 2 steam driven Auxiliary Feed Water (AFW) turbine trip and throttle valve and the 1A2 component cooling system heat exchanger.

(2) Unit 2 Yellow shutdown risk week of April12-18 while reactor coolant system (RCS)level was below Reactor flange level and during Reactor core offload, including review of defense in depth protected equipment for U2R23.

(3) Unit 2 Yellow shutdown risk week of April 19-24 while reactor coolant system (RCS)level was below Reactor flange level following core onload, including review of defense in depth protected equipment for U2R23.

71111.15 - Operability Determinations and Functionality Assessments

Operability Determination or Functionality Assessment (IP Section 03.01) (5 Samples)

The inspectors evaluated the licensee's justifications and actions associated with the following operability determinations and functionality assessments:

(1) MSIV 2-FCV-1-22, Steam Generator #3 Main Steam Header Isolation Valve, high friction after adjustment.

(2) Foreign material found in Unit 2 Reactor Vessel Level Indication System (RVLIS) Line (CR 1600942).

(3) 2-FCV-63-22 leaks by when indicating closed (CR 1603527).

(4) Perform evaluation of 2-FSV-68-397, Reactor Head Vent Throttle Valve (CR

===1605225).

(5) Centrifugal Charging Pump (CCP) Room Cooler Potential Design Basis Heat Load Issue (CR 1609392).

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) Design Change Package 22703, Upgrade of the Turbine Driven Auxiliary Feedwater Speed Governor and Flow Controller.

71111.19 - Post-Maintenance Testing

Post-Maintenance Test Sample (IP Section 03.01) ===

The inspectors evaluated the following post maintenance test activities to verify system operability and functionality:

(1) WO 120164119, repair 2-FCV-62-72-A, Regen Heat Exchanger Letdown Isolation Valve, due to local leak rate test failure, on April 12, 2020.

(2) WO 115152446, Replace Power Operated Relief Valve (PORV) SQN-2- 068-0334B, on April 29, 2020.

(3) WO 118769371, Replace SQN-2-VLV-002-0282A, on May 3, 2020.

(4) WO 120418929, Replace TE-68-25A-E, RCS Loop 2 Hot Leg Resistance Temperature Detector (RTD), on May 4, 2020.

71111.20 - Refueling and Other Outage Activities

Refueling/Other Outage Sample (IP Section 03.01) (1 Sample)

(1) The inspectors evaluated refueling outage U2R23 activities from April 10, 2020 to May 4, 2020.

71111.22 - Surveillance Testing

The inspectors evaluated the following surveillance tests:

Surveillance Tests (other) (IP Section 03.01)

(1) 0-SI-OPS-082-026.A, Loss of Offsite Power With Safety Injection - D/G 2A-A Test on April 12, 2020.

(2) 0-SI-SXV-068-201.0, Pressurizer PORV Operability Test performed prior to being required for LTOP on April 24, 2020.

Containment Isolation Valve Testing (IP Section 03.01) (1 Sample)

(1) 0-SI-SLT-062-258.1, Unit 2 - Containment Isolation Valve - Local Leak Rate Test Chemical and Volume Control System, on April 12, 2020.

Ice Condenser Testing (IP Section 03.01) (1 Sample)

(1) 0-SI-MIN-061-105.0, Ice Condenser - Ice Weighing on April 22,

RADIATION SAFETY

71124.05 April 2020 - April 2020 Radiation Monitoring Instrumentation April 2020 Calibration and Testing Program (IP Section 03.02)

The inspectors evaluated the calibration and testing of the following radiation detection instruments:

(1) Unit 1 Containment High Range Monitor 1-RE-90-271 (Upper Containment)

(2) Unit 1 Containment High Range Monitor 1-RE-90-274 (Lower Containment)

(3) Whole Body Counter, TVA No. 2

(4) Perkin-Elmer Tri Carb Liquid Scintillation Counter No. 2203

(5) Count Room Gamma Detector No. 2

(6) ARGOS Personnel Contamination Monitor, TVA No. 951453

(7) CRONOS Small Article Monitor, TVA No. 951456

(8) GEM-5 Portal Monitor, TVA No. 18pm

(9) Mirion Telepole, TVA No. 860096

(10) Ludlum 12-4, TVA No. 860290

(11) Thermo Radeye GX, TVA No. 951143

(12) Mirion AMP-100, TVA No. 951485

(13) DMC-3000 ED, TVA No. A0B724

(14) AMS-4 Continuous Air Monitor, TVA No. 860272 April 2020 Effluent Monitoring Calibration and Testing Program Sample (IP Sample 03.03) (3 Samples)

The inspectors evaluated the calibration and maintenance of the following radioactive effluent monitoring and measurement instrumentation:

(1) Auxiliary Building Vent Gaseous Radiation Monitor, 0-R-90-101B

(2) Waste Disposal System Liquid Effluent Radiation Monitor, 0-R-90-122

(3) Auxiliary Building Gas Treatment System Filter, Train A

OTHER ACTIVITIES - BASELINE

===71151 - Performance Indicator Verification The inspectors verified licensee performance indicators submittals listed below:

IE01: Unplanned Scrams per 7000 Critical Hours Sample (IP Section 02.01) ===

(1) Unit 1 (April 2019 - March 2020)

(2) Unit 2 (April 2019 - March 2020)

IE03: Unplanned Power Changes per 7000 Critical Hours Sample (IP Section 02.02) (2 Samples)

(1) Unit 1 (April 2019 - March 2020)

(2) Unit 2 (April 2019 - March 2020)

IE04: Unplanned Scrams with Complications (USwC) Sample (IP Section 02.03) (2 Samples)

(1) Unit 1 (April 2019 - March 2020)

(2) Unit 2 (April 2019 - March 2020)

71152 - Problem Identification and Resolution

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

(1) The inspectors reviewed the licensees corrective action program for potential adverse trends in operationally impactful equipment failures that might be indicative of a more significant safety issue (CR 1573093).

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) Steam leak on turbine drain line results in reactor downpower (CR 1605906).

71153 - Followup of Events and Notices of Enforcement Discretion Event Followup (IP Section 03.01)

(1) The inspectors evaluated Unit 1 reactor trip and safety injection and licensees response on May 13, 2020.

Event Report (IP Section 03.02) (1 Sample)

The inspectors evaluated the following licensee event reports (LERs):

(1) LER 05000327/2019-004-00, Automatic Actuation of Emergency Diesel Generators Due to Loss of Power to 6.9kV Shutdown Board (ADAMS accession:

ML20044D623). The inspectors determined that it was not reasonable to foresee or correct the cause discussed in the LER therefore no performance deficiency was identified. The inspectors also concluded that no violation of NRC requirements occurred.

INSPECTION RESULTS

No findings were identified.

EXIT MEETINGS AND DEBRIEFS

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

• On July 6, 2020, the inspectors presented the integrated inspection results to Mr. Matt Rasmussen and other members of the licensee staff.

• On April 29, 2020, the inspectors presented the Informal debrief with RP and Licensing for the completion of 2 out of 3 samples in IP 71124.05 (Covid-19 remote inspection).

Formal RP exit meeting with senior site management to be conducted when the last sample of the IP can be completed onsite. Inspection results were presented to Lee Baxley (Radiation Protection Manager) and Andrew McNeil (Licensing) and other members of the licensee staff.

DOCUMENTS REVIEWED

Inspection Type Designation Description or Title Revision or

Procedure Date

71111.04 Procedures 0- SI-OPS-082- Diesel Generator Operability Verification Revision 20

007.0

0-SO-74-1 Residual Heat Removal System Revision 107

0-SO-82-3 Diesel Generator 2A-A Revision 67

1,2-SO-3-2 Auxiliary Feedwater System Power Checklist

1,2-SO-3-2 Auxiliary Feedwater System Valve Checklist

71111.05 Corrective Action CR 1615936 Observations from the 6/11/20 SQN Fire Drill 06/11/2020

Documents CR 1617501 Fire Drills Lessons Learned 2nd Quarter 06/18/2020

Fire Plans AUX-0-653-00 Pre-Fire Plan Auxiliary Building, Elevation 653 Revision 9

AUX-0-734-01 Pre-Fire Plan Auxiliary Building, Elevation 734 (Unit 1 Non- Revision 8

RCA Side)

AUX-0-734-02 Pre-Fire Plan Auxiliary Building, Elevation 734 (Unit 2 Non- Revision 7

RCA Side)

CON-0-706-00 Pre-Fire Plan Control Building, Elevation 706 Revision 6

DGB-0-740.5-00 Pre-Fire Plan Diesel Generator Building, Elevation 740.5 Revision 6

ERCW-0-688-00 Pre-Fire Plan Essential Raw Cooling Water Pump Station, Revision 2

Elevation 688

ERCW-0-704-00 Pre-Fire Plan Essential Raw Cooling Water Pump Station, Revision 2

Elevation 704

ERCW-0-720-00 Pre-Fire Plan Essential Raw Cooling Water Pump Station, Revision 3

Elevation 720

Miscellaneous Fire Drill Evaluation Report - Yard Near Solar Building 05/07/2020

Procedures 0-PI-FPU-317- Fire Extinguisher Annual Inspection Revision 9

531.Y

71111.11Q Miscellaneous SEG Steam Generator Tube Rupture with loss of C-9 Interlock Revision 0

OPL273S2007

71111.12 Corrective Action CR 1303568 Unit 2 Turbine and Reactor Shutdown due main turbine drain 08/04/2017

Documents Equipment line steam break

Failure

Investigation

Inspection Type Designation Description or Title Revision or

Procedure Date

CR 1585280 Seven DG B Battery Cells Have Jar Cracks 02/07/2020

CR 1585746 Extent of Condition for BFN DG Battery Jar Cracking 02/10/2020

Miscellaneous CDE 2897 June 4, 2017 Failure of Turbine Startup Drain No. 3 Revision 1

CDE 2986 June 2, 2017 Failure of Turbine Startup Drain No. 3 Revision 1

TVA Central Lab Sequoyah Unit 2 Main Steam Drain Failures 06/20/2017

Technical Report

Procedures NPG-SPP- Quality Critical Maintenance Identification and Oversight Revision 6

07.2.16

TVA-NQA- Nuclear Quality Assurance Plan (NQAP) Quality Assurance Revision 38

PLN89-A Program Description

71111.13 Procedures 0-GO-16 System Operability Checklist Revision 25

71111.15 Drawings 2-47A595-3 Set-Up Parameters for Air Operated Valves, Setup Box for Revision 3

2-FCV-1-22

Engineering EWR-20-DEM- U2R23 MSIV 2-FCV-1-22 High Friction after Adjustment 04/26/2020

Evaluations 001069 Accept As Is Evaluation for CR 1603849

Operability Prompt Determination of Operability for CR 1609392, CCP 05/29/2020

Evaluations Room Cooler Design Basis Heat Load Issue

Procedures 2-PI-ICC-068-397 Channel Calibration of Reactor Vessel Vent Throttle Valve Revision 10

Loop 2-F-68-397 and Vent Valve 2-FSV-68-397

MMTP-154 Air Operated Valve Diagnostic Testing Revision 0

Work Orders WO 121314149 2-FSV-068-397 not operating properly 05/20/2020

71111.19 Procedures 0-SI-SXV-068- Pressurizer PORV Operability Test Revision 2

201.0

2-SI-ICC-068- Channel Calibration of Delta T/ Tave Channel II, Rack 6 Revision 25

25.2 Loop 2-T-68-25

2-SI-IFT-003- Functional Test of Environmental Allowance Monitor / Trip Revision 23

519.2 Time Delay Protection Set II

2-SI-IRT-099- Response Time Test of RTD's in Loops 2-T-68-2 and 2-T- Revision 11

13A.0 68-25 Using Analysis and Measurement Services

Techniques Cycle A

2-SI-SXI-068- Leakage Test of the Reactor Coolant Pressure Boundary Revision 16

201.0

Work Orders 121274792 Pen X-15 (Letdown) Failed As Found LLRT 04/20/2020

21282200 Troubleshoot and Increase Seating Load on 2-FCV-62-72-A 04/20/2020

Inspection Type Designation Description or Title Revision or

Procedure Date

71111.20 Miscellaneous Unit 2 Cycle 23 Outage Safety Plan Revision 0

SQN-2-130 Fuel Transfer Operation - U2R23 Core Offload Revision 0

SQN-2-134 Fuel Transfer Operation - Core Reload Revision 0

Procedures 0-GO-5 Normal Power Operation Revision 97

0-GO-6 Power Reduction from 30% Reactor Power to Hot Standby Revision 65

0-GO-7 Unit Shutdown from Hot Standby to Cold Shutdown Revision 88

0-SI-SXX-068- RCS and Pressurizer Temperature and Pressure Limits Revision 15

27.0

E-0 Reactor Trip or Safety Injection Revision 41

ES-0.1 Reactor Trip Response Revision 39

71111.22 Corrective Action CR 1600918 Pen X-15 (Letdown) Failed as found LLRT 04/12/2020

Documents CR 1605537 U2 Ice Condenser Frozen Basket Trend 05/03/2020

Miscellaneous 0-SI-SLT-062- Unit 2 - Containment Isolation Valve Local Leak Rate Test 04/30/2017

258.1 Chemical and Volume Control System, completed

performance

U2R23.OUT ICE, Computer Program Version SQ1.1 04/22/2020

NDE Reports 0-SI-SLT-0692- Unit 2 - Containment Isolation Valve Local Leak Rate Test 05/10/17

258.1 Chemical and Volume Control System, completed

performance

71124.05 Corrective Action CR 1554447 Upper Containment Rad Monitor drifting into alarm 10/03/2019

April 2020 Documents CR 1569547 FY19 Annual and 4th Quarter RP Instrument Performance 11/29/2019

Trend Review

CR 1580287 2-RE-90-130 failed to respond to source check 01/21/2020

Miscellaneous Sequoya Nuclear Offsite Dose Calculation Manual (ODCM) Rev. 0063

Plant

Procedures 0-TI-CEM-016- Shield Building Radiation Monitor Sampling Methods Rev. 0002

001.4

RCDP-8 Radiological Instrumentation/Equipment Controls Rev. 0008

RCI-05 Radiation Protection Instrumentation Program Rev. 0083

Self-Assessments SQN-RP-SA-18- Radiation Monitoring Instrumentation 10/12/2018

013

71152 Corrective Action CR 1605906 Steam Leak on Turbine Drain Line Results in Reactor 06/04/2020

Documents Level 2 Downpower

Evaluation Report

Inspection Type Designation Description or Title Revision or

Procedure Date

71153 Corrective Action CR 1115176 GR5 Relays from ABB have incorrect components 02/25/2016

Documents CR 1142038 Part 21 evaluation for ABB GR5 Relays 03/03/2016

CR 1573472 Loss of 1B-B Shutdown Board Offsite Power 12/16/2019

CR 1573726 250 VDC Station Battery system voltage excursion 12/16/2019

CR 1607726 Transient on Unit 1 Reactor Trip and Safety Injection 05/13/2020

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