IR 05000331/2019003
| ML19317E420 | |
| Person / Time | |
|---|---|
| Site: | Duane Arnold  |
| Issue date: | 11/12/2019 |
| From: | Billy Dickson NRC/RGN-III/DRP/B2 |
| To: | Dean Curtland NextEra Energy Duane Arnold |
| References | |
| IR 2019003 | |
| Download: ML19317E420 (16) | |
Text
November 12, 2019
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
Inspection Report
Docket Number:
05000331
License Number:
Report Number:
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
SUMMARY
The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees 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 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
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
- (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
- (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)
(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
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,
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 licensees voluntary groundwater protection initiative.
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) 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 licensees 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 licensees 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) 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,
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 licensees 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.
DOCUMENTS REVIEWED
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
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
UFSAR/DAEC-1
Section 2.4
Hydrologic Engineering
Procedures
AOP 902
Flood
71111.04Q Corrective Action
Documents
Configuration Control R1-Clearance 2401-V32-043-01
Drawings
BECH-M132<1>
Diesel Generator System
BECH-M132<1>
PI&D Diesel Generator
Procedures
OI 255A2
Control Rod Drive System Valve Lineup
OI 255A3
Control Rod Drive System HCU Valve Lineup
STP 3.8.1-11A
'A' Standby Diesel Generator Air Compressor and Air Check
Valve Tests
71111.05Q Procedures
Pre-fire Plan Pump House
71111.11Q Miscellaneous
Reactivity Management Plan Plant Down Power Sequence
Exchange
07/26/2019
Scenario ESG 2019D-01E Evaluated Scenario
Procedures
IPOP-3
Power Operations
160
Work Orders
40673592
Standby Diesel Generator Exhaust Damper Operator Failed
Corrective Action
Documents
1-2699-0-D-E1101; Schematic-36V Breaker GB SW5980
20630
'C' River Water Supply Pump 1P117C
21822
Injector Push Tubes Damaged due to Vendor Maladjustment 0
220761
1P117C Vibration Above Alert Limit
Condition Report
2324122
Fuel Leak on Cylinder 2 Fuel Head Drain Connection
08/12/2019
Engineering
Changes
291019
Rec-FR4414G
Procedures
STP NS 190101
Standby Service Air Compressor (1K1) Operability Test
Work Orders
40585931
FR4414G Replace Recorder Per EC
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
40593711-01
Braze New Fitting on #2 CS Clean Fuel Oil Drain Header
40622298
1P-49-E Annual Engine Inspection with Vendor
40625584
Backup Instrument Air Compressor
08/28/2019
40626684
CB5980; SF6 Breaker Inspection
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
Corrective Action
Documents
2307849
'A' Rod Block Monitor Anomalous Behavior
2307896
'B' Rod Block Monitor Anomalous Behavior
20205
'B' Standby Diesel Exhaust Damper Operator Failed
22707
Missing bolt on Turbo Charger Inlet
22820
Identified Legacy MCPR Error
22883
Loss of 1C05 Alarms
22883
Loss of 1C05 Alarms
Condition Report
2635
'A' Standby Diesel Generator Starting Air Check Valve,
V-32-43 Failed Surveillance
Drawings
BECH-M132<1>
Diesel Generator System
Procedures
AOP 302.2
Loss of Alarm Panel Power
STP 3.8.1-11A
'A' Standby Diesel Generator Air Compressor and Air Start
Check Valves Tests
Corrective Action
Documents
GMP-TEST-60; 'B' Standby Diesel Generator 1G-21 Room
Heating Ventilation, and Air ConditioningTest
2328178
Unable to Calibrate KAMAN 6 per Surveillance Test
Procedure
2328807
1C26A(B-5) 'A' Chiller 1V-CH-1A Trouble Activated
2328927
1C-330B K-6 Microcomputer Not Updating to PPC
NS13B009
Diesel Driven Fire Pump Functional Tests and Fuel Oil
Supply Verification
Miscellaneous
Work Request
40593711-01
Braze New Fitting on #2 CS Clean Fuel Oil Drain Header
Procedures
Operating
Instruction-324
Standby Diesel Generator System
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Operating
Instruction-324
Standby Diesel Generator System
26
STP 3.7.5-01A
'A' Control Building Chiller Operability
STP 3.8.1-11A
Standby Diesel Generator Air Compressor and Air Start
Check Valve Test
STP NS 190101
Standby Service Air Compressor (1K1) Operability Test
STP NS340003
Reactor Building Monitor Flow Test Dated 09-16-2019
STP NS340003
Reactor Building Flow Monitor Calibration Test Dated
09/25/2019
STP NS340003
Reactor Building Flow Monitor Calibration
Work Orders
40593711-01
Braze New Fitting on #2 CS Clean Fuel Oil Drain Header
40622298
1P049-E; Annual Engine Inspection with Vendor
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
40682200-01
Air Receiver 1T-115A Oulet Check Valve
09/17/2019
40682200-01
Air Receiver 1t-115A Outlet Check Valve
09/18/2019
Corrective Action
Documents
Technical Specifications (and Bases); Amendment 25
Drawings
BECH-M132<1>
Diesel Generator System
Procedures
STP 3.3.1.1-17
Main Steam Isolation Valve Functional Test
STP 3.3.3.2-15
Remote Shutdown Cooling Residual Heat Removal and
Residual Heat Removal Service Water Components
STP 3.5.1-05
High Pressure Coolant Injection Operability Test
STP 3.5.1-11B
Low Pressure Coolant Injection System Operability Test and
Comprehensive Pump Test
STP 3.7.4-05B
Standby Filter Unit 'B' Operation with Headers
STP 3.8.1-11A
Standby Diesel Generator Air Compressor and Air Start
Check Valve Tests
STP NS 490003B
'B' Residual Heat Removal System Leakage Walk Down
Inspection
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
STP NS100203A
'A' River Water Supply and Screen Wash System Vibration
Measurement and Operability Test
STP NS240501
FLEX 120V Portable Diesel Generator Functional and
Performance Test for 1G102A/GEN; 1G102B/GEN;
1G102C/GEN
Corrective Action
Documents
CRS Tabletop 08-07-19
Calibration
Records
Meteorological Tower Calibration
07/24/2019
Meteorological Tower Calibration
04/24/2019
Environmental Air Sampler Calibration Records
2018
Corrective Action
Documents
Level 1 Assessment - 2017 REMP TLD Assessment
2/23/2018
Met Tower 50M Wind Speed Sensor Failure
03/06/2018
Level 1 Assessment Cs-137 in Soil Samples
03/12/2018
REMP Air Sampler Power Failure at D-11 Toddville
04/01/2019
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
ESP 4.5
Statistical Comparison of TLDs for Direct Radiation Impact
ESP 4.9
Groundwater Remediation
STP NS790710
Radioactive Liquid Release from Clean System
Self-Assessments
NEI Audit of Groundwater Protection Program
2/28/2017
NRC Pre-Inspection Self-Assessment for IP 71124.06 and
07/09/2019
Work Orders
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
Corrective Action
Documents
Condition Report
23114966
1C05B Annunciators Did Not Respond As Expected During
Tests
05/20/2019
Condition Report
1C05 Alarms Disabled for Approximately 1-Hour
05/09/2019
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
2313876
Condition Report
2314063
1C05B (D-2) Failed to Activate During Testing
05/10/2019
Condition Report
2314063
IC05B (D-2) Failed to Activate During Testing
05/10/2019
Condition Report
2317622
1C05B (C-4) Failed to Annunciate During Surveillance Test
Procedure 3.3.1.1-04
06/11/2019
Condition Report
2319657
1C05B (C-1) and (B-5) Annunciators Not Lighting When
Tested
06/29/2019
Condition Report
2322883
Loss of 1C05 Alarms Lights and Horn
07/30/2019
Condition Report
2323487
1C05B A-7 Point Card
08/05/2019
Condition Report
2323664
1C05B Annunciator Panel Troubleshooting
08/07/2019
Condition Report
232792
'B' Reactor Water Cleanup Pump Seal Leak
Condition Report
293282
'A' Reactor Water Cleanup Pump Seal Leak
Condition Report
294880
'B' Reactor Water Cleanup Pump Shaft Seal Leak
Condition Report
2302758
'A' Reactor Water Cleanup Pump Loose Impeller
Work Orders
40582408
'B' Rector Water Cleanup Pump Lube Coupling
40642375
'B' Reactor Water Cleanup Pump Shaft Seal Leak
Corrective Action
Documents
BECH-
E108<004A>
Steam and Condensate System
BECH-M104<2>
Feedwater Heaters 1E003A, 4A, 5A, 6A
Miscellaneous
C07B Moisture Separator Reheater Second Stage Drain
Tanks 1T-92A to 1T-92B Pressure Differential High
Operating Shift Logs May 1, 2019
Operating Shift White Paper on Moisture Separator Drain
Tank High dp
Event Notification
Loss of Feed Water Trip
04/22/2019
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
- 54012
Procedures
AOP 255.2
Power/Reactivity Abnormal Change
0