Duane Arnold Energy Center, Unit 1 - Integrated Inspection ...As part of the trouble shooting, all...

November 12, 2019 Mr. Dean Curtland Director Site Operations NextEra Energy Duane Arnold, LLC 3277 DAEC Road Palo, IA 52324-9785 SUBJECT: DUANE ARNOLD ENERGY CENTER, UNIT 1 – INTEGRATED INSPECTION

REPORT 05000331/2019003 Dear Mr. Curtland: On September 30, 2019, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Duane Arnold Energy Center, Unit 1. On October 3, 2019, the NRC inspectors discussed the results of this inspection with you 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/ Billy C. Dickson, Jr., Chief Branch 2 Division of Reactor Projects

Docket No. 05000331 License No. DPR-49 Enclosure: As stated cc: Distribution via LISTSERV®

Letter to Dean Curtland from Billy Dickson dated November 12, 2019. SUBJECT: DUANE ARNOLD ENERGY CENTER, UNIT 1 – INTEGRATED INSPECTION

REPORT 05000331/2019003 DISTRIBUTION: Jessie Quichocho RidsNrrDorlLpl3 RidsNrrPMDuaneArnold Resource RidsNrrDroIrib Resource Darrell Roberts John Giessner Jamnes Cameron Allan Barker DRPIII DRSIII [email protected]

ADAMS ACCESSION NUMBER: ML19317E420 x SUNSI Review

x Non-Sensitive

Sensitive

x Publicly Available

Non-Publicly Available

OFFICE RIII

NAME BDickson:bw

DATE 11/12/2019

OFFICIAL RECORD COPY

Enclosure

U.S. NUCLEAR REGULATORY COMMISSION Inspection Report

Docket Number: 05000331 License Number: DPR-49 Report Number: 05000331/2019003 Enterprise Identifier: I-2019-003-0066 Licensee: NextEra Energy Duane Arnold, LLC Facility: Duane Arnold Energy Center, Unit 1 Location: Palo, Iowa 52324 Inspection Dates: July 01, 2019 to September 30, 2019 Inspectors: B. Bartlett, Senior Operations Engineer J. Beavers, Senior Resident Inspector S. Bell, Health Physicist L. Kozak, Senior Reactor Analyst V. Myers, Senior Health Physicist C. Norton, Senior Resident Inspector T. Ospino, Reactor Engineer J. Rutkowski, Project Engineer S. Sheldon, Project Engineer Approved By: Billy C. Dickson, Jr., Chief

Branch 2 Division of Reactor Projects

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SUMMARY The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensee’s performance by conducting an integrated inspection at Duane Arnold Energy Center, Unit 1 in accordance with the Reactor Oversight Process. The Reactor Oversight Process is the NRC’s 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.

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PLANT STATUS Duane Arnold 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. REACTOR SAFETY 71111.01 - Adverse Weather Protection External Flooding Sample (IP Section 03.04) (1 Sample)

(1) The inspectors evaluated readiness to cope with external flooding for the following

areas: • Safety related structures and systems on July 16 and 17, 2019

71111.04Q - Equipment Alignment Partial Walkdown Sample (IP Section 03.01) (2 Samples)

The inspectors evaluated system configurations during partial walkdowns of the following systems/trains: (1) Control rod drive system on July 17, 2019 (2) 'A' standby diesel generator air start valves on September 4, 2019

71111.05Q - Fire Protection Quarterly Inspection (IP Section 03.01) (9 Samples)

The inspectors evaluated fire protection program implementation in the following selected areas: (1) Water pump house on July 18, 2019 (2) Administration Building First Floor Fire Zone 20-A and 20-C on July 24, 2019 (3) Reactor Building Elevation 757 Fire Zone 2-F and 2-K on July 24, 2019 (4) Reactor Building Elevation 757 North Fire Zone 8-A on July 24, 2019 (5) Turbine Building Elevation 757 South Fire Zone 8-D and 8-E on July 24, 2019 (6) Turbine Building Elevation 757 North Fire Zone 8-A on July 24, 2019

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(7) Turbine Building Elevation 780 Fire Zone 9-A, 9-B, and 9-C on July 24, 2019 (8) Control Room Complex Elevation 786 Fire Zone 12-A on July 23, 2019 (9) Control Room Heating, Ventilation, and Air Conditioning Elevation 800 Fire

Zone 12-B on July 23, 2019

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 control rod sequence exchange on July 27, 2019 Licensed Operator Requalification Training/Examinations (IP Section 03.02) (1 Sample)

(1) The inspectors observed and evaluated licensed operator re-qualification activity on

September 10, 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) 'B' standby diesel generator ventilation fan exhaust damper on July 11, 2019

71111.13 - Maintenance Risk Assessments and Emergent Work Control Risk Assessment and Management Sample (IP Section 03.01) (6 Samples)

The inspectors evaluated the risk assessments for the following planned and emergent work activities: (1) 'C' river water supply pump on July 15, 2019 (2) Diesel fire pump on July 26, 2019 (3) Transformer XR1 supply breaker preventative maintenance on August 5, 2019 (4) Well water flow recorder replacement on August 7, 2019 (5) 'B' standby diesel generator emergent fuel leak repair on August 13, 2019 (6) Backup instrument air compressor, 1K1, preventive maintenance on August 28, 2019

71111.15 - Operability Determinations and Functionality Assessments Operability Determination or Functionality Assessment (IP Section 02.02) (7 Samples)

The inspectors evaluated the following operability determinations and functionality assessments: (1) 'B' standby diesel generator exhaust damper operator failed on July 8, 2019 (2) 'C' river water supply pump on July 11, 2019 (3) Minimum critical power ratio error on July 31, 2019

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(4) Loss of Control Room alarm horn on July 31, 2019 (5) 'A' standby diesel generator missing turbo charger bolt on August 16, 2019 (6) 'A' standby diesel generator starting air check valve, V-32-43, failed surveillance on

September 4, 2019 (7) ‘A’ control building chiller trouble on September 25, 2019

71111.19 - Post-Maintenance Testing Post-Maintenance Test Sample (IP Section 03.01) (7 Samples)

The inspectors evaluated the following post maintenance tests: (1) 'B' standby diesel generator ventilation fan exhaust damper post maintenance test on

July 11, 2019 (2) Diesel fire pump post maintenance test on July 30, 2019 (3) 'C' river water supply pump post maintenance test on July 23, 2019 (4) 'B' standby diesel generator post maintenance test following fuel leak repair on

August 14, 2019 (5) Backup instrument air compressor, 1K1, post maintenance test on August 28, 2019 (6) 'A' standby diesel generator air start check valve on September 20, 2019 (7) KAMAN 6 on September 30, 2019

71111.22 - Surveillance Testing The inspectors evaluated the following surveillance tests: Surveillance Tests (other) (IP Section 03.01) (4 Samples)

(1) 'A' river water supply and screen wash system vibration measurement and operability

test on July 11, 2019 (2) Portions of the Control Room operations associated with the main steam isolation

valve functional test on July 29, 2019 (3) Remote shutdown panel surveillance test on September 10, 2019 (4) 'A' standby diesel generator air compressor and air start check valve tests on

September 3, 2019 Inservice Testing (IP Section 03.01) (3 Samples)

(1) In field activities associated with low pressure coolant injection operability test on

August 14, 2019 (2) In field activities associated with the ‘A’ standby diesel generator air compressor and

air start check valve tests on September 3, 2019 (3) Portions of the Control Room operations associated with the high pressure coolant

injection system operability test on July 16, 2019 FLEX Testing (IP Section 03.02) (1 Sample)

(1) Flex 120 volt portable diesel generators functional and performance tests on

September 24, 2019

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71114.06 - Drill Evaluation Drill/Training Evolution Observation (IP Section 03.02) (1 Sample)

The inspectors evaluated: (1) Emergency response tabletop drill on August 7, 2019

RADIATION SAFETY 71124.07 - Radiological Environmental Monitoring Program Site Inspection (IP Section 02.01) (1 Sample)

The inspectors evaluated the radiological environmental monitoring program implementation. (1) The inspectors reviewed the following:

Walkdowns, Calibrations, and Maintenance Record Review

• Air sampling station; D-3 • Air sampling station; D-4 • Air sampling station; D-5a • Environmental dosimeter; D-3 • Environmental dosimeter; D-4 • Environmental dosimeter; D-5a

Environmental Sample Collections and Preparation Observation

• Milk sampling location; D-110 • Milk sampling location; D-138 • Airborne particulate and iodine; D-3

Licensee Actions in Response to Missed Sample, Inoperable Sampler, Lost TLD or Anomalous Measurement

• Missed milk sample; 01/09/2018 • Missed air particulate sample; 07/20/2018 • Low sample volume for air particulate and iodine sample; 06/02/2017

Sampling Program for the Potential of Licensed Material Entering Groundwater

• Condensate Storage Tanks • Reactor Building • Turbine Building

Groundwater Protection Initiative (GPI) Implementation (IP Section 02.02) (1 Sample)

(1) The inspectors evaluated the licensee’s voluntary groundwater protection initiative.

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OTHER ACTIVITIES – BASELINE 71151 - Performance Indicator Verification The inspectors verified licensee performance indicators submittals listed below: MS06: Emergency AC Power Systems (IP Section 02.05) (1 Sample)

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

MS07: High Pressure Injection Systems (IP Section 02.06) (1 Sample)

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

MS08: Heat Removal Systems (IP Section 02.07) (1 Sample)

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

71152 - Problem Identification and Resolution Semiannual Trend Review (IP Section 02.02) (1 Sample)

(1) The inspectors reviewed the licensee’s corrective action program for reactor water

cleanup pumps seal leaks for trends that might be indicative of a more significant safety issue on August 16, 2019

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

The inspectors reviewed the licensee’s implementation of its corrective action program related to the following issues: (1) The occurrence of numerous seemingly unrelated Control Room alarm issues that

began in May 2019, was reviewed between August 6 and August 23, 2019

71153 – Follow-up of Events and Notices of Enforcement Discretion Event Follow-up (IP Section 03.01) (1 Sample)

(1) Loss of feed water trip and licensee's response on August 1, 2019

Personnel Performance (IP Section 03.03) (1 Sample)

Pump House Fire AOP Entry Following Maintenance on August 1, 2019 (1) The inspectors evaluated pump house fire and the licensee's response on

August 1, 2019

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INSPECTION RESULTS

Observation: Integrated Control Room Annunciator Issues 71152 The licensee documented numerous control room annunciator issues beginning in May 2019 for the 1C05B panel alarms. The initial issue was a failure of the annunciator horn to silence. As part of the trouble shooting, all the alarm cards on 1C05B were removed and re-seated. Subsequent issues included failure of some 1C05B alarms to annunciate when tested and 1C05B alarm power supply fuses blowing. These were all addressed as single issues and corrected individually. Early in August 2016, the licensee wrote a condition report to address the aggregate 1C05B annunciator issue. The licensee determined that the alarm cards were not fully seated during the trouble shooting for failure of the annunciator horn to silence in May 2019. After re-seating the alarm cards, 1C05B annunciator issues ceased.

Observation: Corrective Action Program for Reactor Water Cleanup Pumps Seal Leaks

71152

The inspectors reviewed the licensee's problem identification and resolution activities associated with the reactor water coolant pump seal leaks over the past six months. The licensee’s corrective action program documented alternating and sequential mechanical seal failures on both pumps. The maintenance efforts resulted in a mixed success as ‘A’ pump was returned to service with no leakage. The ‘B’ pump was returned to service with nearly 300 drops per minute. This leakage, however, was well below the technical specifications limit. The inspectors noted that continuous monitoring of reactor coolant conductivity as well as providing continuous purification of recirculation flow has been maintained during this inspection period.

EXIT MEETINGS AND DEBRIEFS The inspectors confirmed that proprietary information was controlled to protect from public disclosure.

• On October 3, 2019, the inspectors presented the integrated inspection results to Mr. D. Curtland, Director of Site Operations, and other members of the licensee staff.

• On August 15, 2019, the inspectors presented the Radiation Protection Baseline Inspection results to Mr. M. Davis, Licensing Manager, and other members of the licensee staff.

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DOCUMENTS REVIEWED Inspection Procedure

Type Designation Description or Title Revision or Date

71111.01 Engineering Evaluations

Flex-Flood MSA Mitigating Srategies Assessment for Flooding Hazard Reevaluation

11/01/2016

Miscellaneous UFSAR/DAEC - 1 Section 3.4.1

Flood Protection 24

UFSAR/DAEC-1 Section 2.4

Hydrologic Engineering 25

Procedures AOP 902 Flood 62 71111.04Q Corrective Action

Documents

Configuration Control R1-Clearance 2401-V32-043-01 0

Drawings BECH-M132<1> Diesel Generator System 21 BECH-M132<1> PI&D Diesel Generator 21

Procedures OI 255A2 Control Rod Drive System Valve Lineup 7 OI 255A3 Control Rod Drive System HCU Valve Lineup 3 STP 3.8.1-11A 'A' Standby Diesel Generator Air Compressor and Air Check

Valve Tests 11

71111.05Q Procedures PFP-PH-757 Pre-fire Plan Pump House 3 71111.11Q Miscellaneous

Reactivity Management Plan Plant Down Power Sequence Exchange

07/26/2019

Scenario ESG 2019D-01E Evaluated Scenario 0 Procedures IPOP-3 Power Operations 160

71111.12 Work Orders 40673592 Standby Diesel Generator Exhaust Damper Operator Failed 0 71111.13 Corrective Action

Documents

1-2699-0-D-E1101; Schematic-36V Breaker GB SW5980 0

2320630 'C' River Water Supply Pump 1P117C 0 2321822 Injector Push Tubes Damaged due to Vendor Maladjustment 0 23220761 1P117C Vibration Above Alert Limit 0 Condition Report 02324122

Fuel Leak on Cylinder 2 Fuel Head Drain Connection 08/12/2019

Engineering Changes

291019 Rec-FR4414G 01

Procedures STP NS 190101 Standby Service Air Compressor (1K1) Operability Test 20 Work Orders 40585931 FR4414G Replace Recorder Per EC 01

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Inspection Procedure


40593711-01 Braze New Fitting on #2 CS Clean Fuel Oil Drain Header 0 40622298 1P-49-E Annual Engine Inspection with Vendor 0 40625584 Backup Instrument Air Compressor 08/28/2019 40626684 CB5980; SF6 Breaker Inspection 0 40630194 Backup Instrument Air Compressor 08/28/2019 40630701 Intercooler 1E-241 Automatic Drain Trap 08/27/2019 40630702 Aftercooler 1E-242 Automatic Drain Trap 08/27/2019 40673886 'C" River Water Supply Pump 0

71111.15 Corrective Action Documents

2307849 'A' Rod Block Monitor Anomalous Behavior 0 2307896 'B' Rod Block Monitor Anomalous Behavior 0 2320205 'B' Standby Diesel Exhaust Damper Operator Failed 0 2322707 Missing bolt on Turbo Charger Inlet 0 2322820 Identified Legacy MCPR Error 0 2322883 Loss of 1C05 Alarms 21 2322883 Loss of 1C05 Alarms 0 Condition Report 232635

'A' Standby Diesel Generator Starting Air Check Valve, V-32-43 Failed Surveillance

0

Drawings BECH-M132<1> Diesel Generator System 21 Procedures AOP 302.2 Loss of Alarm Panel Power 21

STP 3.8.1-11A 'A' Standby Diesel Generator Air Compressor and Air Start Check Valves Tests

11


GMP-TEST-60; 'B' Standby Diesel Generator 1G-21 Room Heating Ventilation, and Air ConditioningTest

10

02328178 Unable to Calibrate KAMAN 6 per Surveillance Test Procedure

0

02328807 1C26A(B-5) 'A' Chiller 1V-CH-1A Trouble Activated 0 02328927 1C-330B K-6 Microcomputer Not Updating to PPC 0 NS13B009 Diesel Driven Fire Pump Functional Tests and Fuel Oil

Supply Verification 53

Miscellaneous Work Request 40593711-01

Braze New Fitting on #2 CS Clean Fuel Oil Drain Header 0

Procedures Operating Instruction-324

Standby Diesel Generator System 26

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Operating Instruction-324

Standby Diesel Generator System 126

STP 3.7.5-01A 'A' Control Building Chiller Operability 6 STP 3.8.1-11A Standby Diesel Generator Air Compressor and Air Start

Check Valve Test 11

STP NS 190101 Standby Service Air Compressor (1K1) Operability Test 20 STP NS340003 Reactor Building Monitor Flow Test Dated 09-16-2019 17 STP NS340003 Reactor Building Flow Monitor Calibration Test Dated

09/25/2019 17

STP NS340003 Reactor Building Flow Monitor Calibration 17 Work Orders 40593711-01 Braze New Fitting on #2 CS Clean Fuel Oil Drain Header 0

40622298 1P049-E; Annual Engine Inspection with Vendor 0 40625584 Backup Instrument Air Compressor 08/28/2019 40630194 Backup Instrument Air Compressor 08/28/2019 40630701 Intercooler 1E-241 Automatic Drain Trap 08/27/2019 40630702 Aftercooler 1E-242 Automatic Drain Trap 08/27/2019 40673592 Standby Diesel Exhaust Damper Operator Failed 0 40682200-01 Air Receiver 1T-115A Oulet Check Valve 09/17/2019 40682200-01 Air Receiver 1t-115A Outlet Check Valve 09/18/2019


Technical Specifications (and Bases); Amendment 25

Drawings BECH-M132<1> Diesel Generator System 21 Procedures STP 3.3.1.1-17 Main Steam Isolation Valve Functional Test 15

STP 3.3.3.2-15 Remote Shutdown Cooling Residual Heat Removal and Residual Heat Removal Service Water Components

3

STP 3.5.1-05 High Pressure Coolant Injection Operability Test 83 STP 3.5.1-11B Low Pressure Coolant Injection System Operability Test and

Comprehensive Pump Test 18

STP 3.7.4-05B Standby Filter Unit 'B' Operation with Headers 11 STP 3.8.1-11A Standby Diesel Generator Air Compressor and Air Start

Check Valve Tests 11

STP NS 490003B 'B' Residual Heat Removal System Leakage Walk Down Inspection

4

12



STP NS100203A 'A' River Water Supply and Screen Wash System Vibration Measurement and Operability Test

27

STP NS240501 FLEX 120V Portable Diesel Generator Functional and Performance Test for 1G102A/GEN; 1G102B/GEN; 1G102C/GEN

8


CRS Tabletop 08-07-19 2

71124.07 Calibration Records

Meteorological Tower Calibration 07/24/2019 Meteorological Tower Calibration 04/24/2019 Environmental Air Sampler Calibration Records 2018

Corrective Action Documents

AR 02251132 Level 1 Assessment - 2017 REMP TLD Assessment 02/23/2018 AR 02252731 Met Tower 50M Wind Speed Sensor Failure 03/06/2018 AR 02253793 Level 1 Assessment Cs-137 in Soil Samples 03/12/2018 AR 02308312 REMP Air Sampler Power Failure at D-11 Toddville 04/01/2019 AR02324434 GWPP Extraction Well Flow Meter Failure 08/14/2019

Miscellaneous

2018 Annual Radiological Environmental Operating Report 05/14/2019 Quality Control for Radiological Environmental Records 05/30/2019 Environmental Air Sampling Station Logs 2018 Offsite Dose Assessment Manual 38-40 2017 Annual Radiological Environmental Operating Report 05/11/2018

Procedures ESP 4.3.1.15 Milk Sampling 34 ESP 4.5 Statistical Comparison of TLDs for Direct Radiation Impact 6 ESP 4.9 Groundwater Remediation 5 STP NS790710 Radioactive Liquid Release from Clean System 3

Self-Assessments

NEI Audit of Groundwater Protection Program 12/28/2017 NRC Pre-Inspection Self-Assessment for IP 71124.06 and 71124.07

07/09/2019

Work Orders WO 40631719-01 Meteorological System Channel Checks 05/01/2019 71151 Corrective Action

Documents

Monthly MSP/Maintenance Rule Data Entry Sheets; July 1, 2018 through June 30, 2019

1

71152 Corrective Action Documents

Condition Report 023114966

1C05B Annunciators Did Not Respond As Expected During Tests

05/20/2019

Condition Report 1C05 Alarms Disabled for Approximately 1-Hour 05/09/2019

13



02313876 Condition Report 02314063

1C05B (D-2) Failed to Activate During Testing 05/10/2019


IC05B (D-2) Failed to Activate During Testing 05/10/2019


1C05B (C-4) Failed to Annunciate During Surveillance Test Procedure 3.3.1.1-04

06/11/2019


1C05B (C-1) and (B-5) Annunciators Not Lighting When Tested

06/29/2019


Loss of 1C05 Alarms Lights and Horn 07/30/2019


1C05B A-7 Point Card 08/05/2019


1C05B Annunciator Panel Troubleshooting 08/07/2019


'B' Reactor Water Cleanup Pump Seal Leak 0


'A' Reactor Water Cleanup Pump Seal Leak 0


'B' Reactor Water Cleanup Pump Shaft Seal Leak 0


'A' Reactor Water Cleanup Pump Loose Impeller 0

Work Orders 40582408 'B' Rector Water Cleanup Pump Lube Coupling 0 40642375 'B' Reactor Water Cleanup Pump Shaft Seal Leak 0

71153 Corrective Action Documents

BECH-E108<004A>

Steam and Condensate System 11

BECH-M104<2> Feedwater Heaters 1E003A, 4A, 5A, 6A 28 Miscellaneous

C07B Moisture Separator Reheater Second Stage Drain Tanks 1T-92A to 1T-92B Pressure Differential High

96

Operating Shift Logs May 1, 2019 0 Operating Shift White Paper on Moisture Separator Drain Tank High dp

0

Event Notification Loss of Feed Water Trip 04/22/2019

14



#54012 Procedures AOP 255.2 Power/Reactivity Abnormal Change 0

Duane Arnold Energy Center, Unit 1 - Integrated Inspection ...As part of the trouble shooting, all...

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