IR 05000461/2021002
| ML21216A210 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 08/09/2021 |
| From: | Kenneth Riemer NRC/RGN-III/DRP/B1 |
| To: | Rhoades D Exelon Generation Co, Exelon Nuclear |
| References | |
| IR 2021002 | |
| Download: ML21216A210 (12) | |
Text
SUBJECT:
CLINTON POWER STATION - INTEGRATED INSPECTION REPORT 05000461/2021002
Dear Mr. Rhoades:
On June 30, 2021, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Clinton Power Station. On July 8, 2021, the NRC inspectors discussed the results of this inspection with Ms. N. Plumey, Plant Manager, 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, Kenneth R. Riemer, Chief Branch 1 Division of Reactor Projects Docket No. 05000461 License No. NPF-62
Enclosure:
As stated
Inspection Report
Docket Number:
05000461
License Number:
Report Number:
Enterprise Identifier:
I-2021-002-0073
Licensee:
Exelon Generation Company, LLC
Facility:
Clinton Power Station
Location:
Clinton, IL
Inspection Dates:
April 01, 2021 to June 30, 2021
Inspectors:
J. Beavers, Senior Resident Inspector
J. Murphy, Illinois Emergency Management Agency
E. Sanchez Santiago, Senior Reactor Inspector
D. Sargis, Resident Inspector
Approved By:
Kenneth R. Riemer, Chief
Branch 1
Division of Reactor Projects
SUMMARY
The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting an integrated inspection at Clinton Power Station, 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 05000461/2020-001-00 LER 2020-001-00 for Clinton Power Station, Unit 1,
Reportable Contraband Event 71153 Closed
PLANT STATUS
Unit 1 began the inspection period at rated thermal power and remained at or near rated thermal power 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 and regional 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, increasing the amount of time on site as local COVID-19 conditions permitted.
As part of their onsite activities, resident inspectors 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 a 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.
REACTOR SAFETY
71111.01 - Adverse Weather Protection
Seasonal Extreme Weather Sample (IP Section 03.01) (1 Sample)
- (1) The inspectors evaluated readiness for seasonal extreme weather conditions prior to the onset of summer readiness for the following systems:
switchyard, transformers, and main generator on June 30, 2021
External Flooding Sample (IP Section 03.03) (1 Sample)
- (1) The inspectors evaluated that flood protection barriers, mitigation plans, procedures, and equipment are consistent with the licensees design requirements and risk analysis assumptions for coping with external flooding on June 28, 2021.
71111.04 - Equipment Alignment
Partial Walkdown Sample (IP Section 03.01) (6 Samples)
The inspectors evaluated system configurations during partial walkdowns of the following systems/trains:
(1)
'B' residual heat removal train on April 13, 2021 (2)low pressure core spray on April 22, 2021 (3)
'B' standby gas treatment on May 13, 2021
- (4) Division II shutdown service water on May 19, 2021 (5)
'A' residual heat removal system on May 20, 2021
- (6) Division III shutdown service water on June 25, 2021
71111.05 - Fire Protection
Fire Area Walkdown and Inspection Sample (IP Section 03.01) (8 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) Fire Zone A-3(a); residual heat removal 'B' pump and heat exchanger rooms; elevation 707' - 781'; on April 13, 2021
- (2) Fire Zone FLEX equipment storage building on April 26, 2021
- (3) Fire Zone CB-1(f); control building general area; elevation 762'; on May 18, 2021
- (4) Fire Zone F-1(j,k,m,n,o,p); fuel handling building; elevation 737'; on May 20, 2021
- (5) Fire Zone T-1(b); condensate booster pump room; elevation 712'; on May 25, 2021
- (6) Fire Zone C-2; containment; elevation 803'; on May 26, 2021
- (7) Fire Zone radwaste floor drain and chemical waste area; elevation 737'; on June 29, 2021
- (8) Fire Zone A-2(c); low pressure core spray; elevation 702' - 712'; on April 22, 2021
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 maximum generation emergency event on June 10, 2021.
Licensed Operator Requalification Training/Examinations (IP Section 03.02) (1 Sample)
- (1) The inspectors observed and evaluated simulator performance on May 18, 2021.
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 remain capable of performing their intended function:
(1)reactor core isolation cooling five card failure (2)drywell cooling heating ventilation and air conditioning system
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) Work Order 5117981, "Division 1 4kV Undervoltage Relay Calibration"
- (2) Work Order 5114278, "Reactor Core Isolation Cooling Valve Operability Check"
- (3) Work Order 4906101, "Plant Process Computer Server Replacement"
71111.15 - Operability Determinations and Functionality Assessments
Operability Determination or Functionality Assessment (IP Section 03.01) (4 Samples)
The inspectors evaluated the licensee's justifications and actions associated with the following operability determinations and functionality assessments:
(1)reserve auxiliary transformer static volt compensator on May 25, 2021 (2)standby gas treatment shutdown safety water leaks on May 24, 2021 (3)reactor core isolation cooling isolation valve blown control power fuse on March 23, 2021 (4)drywell radiation monitor computer point failed low on June 17, 2021
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)plant process computer server replacement
71111.19 - Post-Maintenance Testing
Post-Maintenance Test Sample (IP Section 03.01) (5 Samples)
The inspectors evaluated the following post-maintenance test activities to verify system operability and functionality:
- (1) Work Order 4964726-05, "Low Pressure Core Spray Pump Run"
- (2) Work Order 5017524, "Residual Heat Removal Pump 'A' Run Following Oil Change"
- (3) Work Order 1156377-02, "1G36F002A Stroke Following Actuator Repairs"
- (4) Work Order 4992375-06, "1SC01PC Post Maintenance Test"
- (5) Work Order 4992375-11, "Run Div III SX Pump for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> Then Time Coast Down"
71111.22 - Surveillance Testing
The inspectors evaluated the following surveillance tests:
Surveillance Tests (other) (IP Section 03.01)
- (1) Work Order 5114278, "Reactor Core Isolation Cooling Valve Operability Check"
Inservice Testing (IP Section 03.01) (1 Sample)
- (1) Work Order 5136865, "Low Pressure Core Spray Pump and Water Leg Pump Operability Check"
FLEX Testing (IP Section 03.02) (1 Sample)
- (1) FLEX pump testing on April 26,
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 (April 1, 2020 through March 31, 2021)
MS07: High Pressure Injection Systems (IP Section 02.06) (1 Sample)
- (1) Unit 1 (April 1, 2020 through March 31, 2021)
MS08: Heat Removal Systems (IP Section 02.07) (1 Sample)
- (1) Unit 1 (April 1, 2020 through March 31, 2021)
71153 - Follow Up of Events and Notices of Enforcement Discretion Event Follow up (IP Section 03.01)
- (1) The inspectors evaluated grid disturbance and loss of south offsite electrical ring bus on April 2, 2021.
Event Report (IP Section 03.02) (1 Sample)
The inspectors evaluated the following licensee event reports (LERs):
- (1) LER 05000461/2020-001-00, Reportable Contraband Event (ADAMS Accession No. ML20083M365)
The inspectors reviewed the LER submittal. The previous LER submittal was reviewed in Inspection Report 05000461/2020403 (Non-Public) under Inspection Results Section 93812 and Inspection Report 05000461/2020404.
INSPECTION RESULTS
Observation: Licensee Event Report (LER) 2020-001-00: Reportable Contraband Event Closure 71153 The inspectors identified no accuracy or completeness issues with LER 2020-001-00. The inspectors evaluated the corrective actions taken and planned document by corrective program item 4311763 as appropriate. No additional issues were identified by the inspectors.
Observation: Electrical Grid Disturbance and Loss of South Offsite Electrical Ring Bus on April 2, 2021 71153 The inspectors evaluated grid disturbance and loss of south offsite electrical ring bus on April 2, 2021. The inspectors verified separate qualified sources were determined to remain available to the electrical safety buses and that no safety functions were degraded. The inspectors identified no issues with operator response or onsite facility performance. No actual or potential hazard to public health and safety, common defense and security, property, or the environment was identified.
EXIT MEETINGS AND DEBRIEFS
The inspectors verified no proprietary information was retained or documented in this report.
On July 8, 2021, the inspectors presented the integrated inspection results to Ms. N. Plumey, Plant Manager, and other members of the licensee staff.
DOCUMENTS REVIEWED
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Corrective Action
Documents
Entered 4303.02 Abnormal Lake Level
06/26/2021
Procedures
CPS 4303.02
Abnormal Lake Level
13a
3312.01E001
Residual Heat Removal Electrical Lineup
3312.01V001
Residual Heat Removal Valve Lineup
17c
Procedures
CPS 3313.01
Low Pressure Core Spray
1893.04M340
2' Control: General Access Area Prefire Plan
6d
1893.04M701
2' Turbine: Condensate Booster Pump Room Prefire Plan
6a
1893.04M101
707' - 712' Auxiliary: LPCS Pump Room Prefire Plan
5a
1893.04M240
803' Containment: Prefire Plan
1893.04M410
737' Fuel: Grade Level Prefire Plan
4c
1893.04M621
Radwaste Floor Drain and Chemical Waste Area Prefire Plan
5a
1893.04M838
Flex Equipment Storage Building Prefire Plan
Fire Plans
1983.04M104
707' - 781' Auxiliary: RHR 'B' Pump and Heat Exchanger
Room Prefire Plan
5b
Unexpected RCIC Response During 9030.01 C034/C035
Testing
2/26/2020
Corrective Action
Documents
VP 'A' Chiller Operating Erratically
04/14/2021
PPC Server Refresh Install EC 627563
06/23/2021
OP 9054.02 RCIC Valve Operability
04/09/2021
Work Orders
Division 1 4kV Undervoltage Relay Calibration
1AP74E8C - F01 Blown Control Power Fuse on 1E51-F064
03/23/2021
0SX008 Leakage Observed During VG Loop Seal Fill
0SX009 Leakage Found During VG Loop Seal Fill
Corrective Action
Documents
Low RAT SVC Ouput VARS 33.5 MVAR
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
CM-BA905 Computer Point Failed Low
06/17/2021
1G36-F002A Very Slow to Stroke Closed
05/26/2021
LPCS Pump Run
1SX01PC Pull Entire Div 3 SX Pump Internals
Run Div III SX Pump for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> Then Time Coast Down
Work Orders
Outboard Motor Bearing Oil Potentially Degraded
04/14/2021
9054.02A20 OP RCIC Valve Operability
04/09/2021
Work Orders
9052.01 LPCS Pump Operability
06/15/2021
Procedures
OP-CL-108-107-
1003
CPS Response to Grid Capacity Conditions
0