IR 05000461/2022002
| ML22206A252 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 07/27/2022 |
| From: | Robert Ruiz NRC/RGN-III/DRP/B1 |
| To: | Rhoades D Constellation Energy Generation |
| References | |
| IR 2022002 | |
| Download: ML22206A252 (10) | |
Text
SUBJECT:
CLINTON POWER STATION - INTEGRATED INSPECTION REPORT 05000461/2022002
Dear Mr. Rhoades:
On June 30, 2022, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Clinton Power Station. On July 7, 2022, the NRC inspectors discussed the results of this inspection with Mr. T. Chalmers, Site Vice President, 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, Robert Ruiz, 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-2022-002-0046
Licensee:
Constellation Nuclear
Facility:
Clinton Power Station
Location:
Clinton, IL
Inspection Dates:
April 01, 2022, to June 30, 2022
Inspectors:
J. Beavers, Senior Resident Inspector
C. Mathews, Illinois Emergency Management Agency
D. Turpin, Reactor Engineer
Approved By:
Robert Ruiz, 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
None.
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 performed activities described in IMC 2515, Appendix D, Plant Status, observed risk significant activities, and completed on-site portions of IPs. 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
71111.04 - Equipment Alignment
Partial Walkdown Sample (IP Section 03.01) (1 Sample)
The inspectors evaluated system configurations during partial walkdowns of the following systems/trains:
(1)
'A' residual heat removal train on April 12 to 14, 2022
71111.05 - Fire Protection
Fire Area Walkdown and Inspection Sample (IP Section 03.01) (2 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)778 Containment East Prefire Plan on January 28, 2022 (2)778 Containment West Prefire Plan on January 28, 2022
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 reactivity change on May 21, 2022.
Licensed Operator Requalification Training/Examinations (IP Section 03.02) (1 Sample)
- (1) The inspectors observed and evaluated out-of-the-box simulator training on May 17, 2022.
71111.12 - Maintenance Effectiveness
Maintenance Effectiveness (IP Section 03.01) (1 Sample)
The inspectors evaluated the effectiveness of maintenance to ensure the following structures, systems, and components remain capable of performing their intended function:
- (1) Division 1 emergency diesel generator shutdown service water pipe repair on April 13, 2022
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 (WO) 5206687, "Division 1 Emergency Diesel Generator Shutdown Service Water Pipe Repair"
- (2) WO 4956908, "Division 1 Residual Heat Removal Heat Exchanger System Outage Window"
- (3) WO 5237606, "Residual Heat Removal B Pump Operability"
71111.15 - Operability Determinations and Functionality Assessments
Operability Determination or Functionality Assessment (IP Section 03.01) (6 Samples)
The inspectors evaluated the licensee's justifications and actions associated with the following operability determinations and functionality assessments:
- (1) Action Request (AR) 4489696, "Division 2 Emergency Diesel Generator Issues"
- (2) AR 4491835, "Unexpected Main Control Room Annunciator 5067-2D Main Steam Line Pressure Low"
- (3) AR 4493580, "Fire Pump B Running Speed High Out of Specification"
- (4) AR 4493041, "Unexpected Maximum Fraction of Limiting Power Density and Maximum Average Planar Ratio Online/Offline Bias Trend"
- (5) AR 4495830, "Lower Containment Outer Door Equalizing Valve Found Open"
- (6) AR 4507841, "Division 1 Emergency Diesel Generator 12 Cylinder Lube Oil Temp Low"
71111.18 - Plant Modifications
Temporary Modifications and/or Permanent Modifications (IP Section 03.01 and/or 03.02) (2 Samples)
The inspectors evaluated the following temporary or permanent modifications:
(1)containment floor drain sump pumping to containment equipment sump temporary modification on May 25, 2022 (2)disable 1B21F041L and 1B21F041C inputs for safety-relief valve monitoring system annunciator on May 25, 2022
71111.19 - Post-Maintenance Testing
Post-Maintenance Test Sample (IP Section 03.01) (5 Samples)
The inspectors evaluated the following post-maintenance testing activities to verify system operability and/or functionality:
- (1) WO 4974727-05, "1B1 Reserve Breaker Swap"
- (2) WO 5206687-07, Division 1 Emergency Diesel Generator Shutdown Service Water Pipe Repair
- (3) WO 5223317-02, "828' Containment Inner Door"
- (4) WO 4806063-11, "Division 2 Standby Gas Treatment System Cooling Water Flow"
- (5) WO 5119146, "RHR Pump 1C Suction Valve"
71111.22 - Surveillance Testing
The inspectors evaluated the following surveillance testing activities to verify system operability and/or functionality:
Surveillance Tests (other) (IP Section 03.01) (2 Samples)
- (1) WO 5077841, "Division 2 Emergency Diesel Generator 24 HR RUN AND HOT RESTART"
- (2) WO 5100619, "Division 2 Standby Gas Treatment Train Deluge Valve Operability"
Inservice Testing (IP Section 03.01) (1 Sample)
- (1) Clinton Power Station (CPS) 9015.01, "Standby Liquid Control Pump B Surveillance Test," April 1,
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, 2021, through March 31, 2022)
MS07: High Pressure Injection Systems (IP Section 02.06) (1 Sample)
- (1) Unit 1 (April 1, 2021, through March 31, 2022)
MS08: Heat Removal Systems (IP Section 02.07) (1 Sample)
- (1) Unit 1 (April 1, 2021, through March 31, 2022)
71152A - Annual Follow-Up Problem Identification and Resolution Annual Follow-Up of Selected Issues (Section 03.03)
The inspectors reviewed the licensees implementation of its corrective action program related to the following issues:
(1)review and assessment of the corrective actions from FLEX equipment testing issues July 1, 2021, through June 30, 2022 (2)review and assessment of the corrective actions of shutdown service water leakage issues from July 1, 2021, through June 30,
INSPECTION RESULTS
Observation: Review and Assessment of the Corrective Actions from FLEX Equipment Testing Issues July 1, 2021, through June 30, 2022 71152A The inspectors performed a detailed review and assessment of the licensees corrective actions for several issues that were identified during FLEX surveillance testing over the past year. The inspectors reviews included, but were not limited to, the following ARs:
AR 4476860, "FLEX B Generator Run Difficulties"
AR 4466948, "FLEX B Generator Run Procedure Enhancements"
AR 4477755, "FLEX A Booster Pump Indication Issue"
AR 4477887, "FLEX A Booster Pump Run Issues"
AR 4476860, "FLEX B Generator Failure to Accelerate"
AR 4476860, "FLEX B Generator Fuel Oil Leak" The inspectors reviewed the transition from contractor performed to operator performed surveillances on the FLEX equipment. Necessary enhancements to both procedures and operator training were observed during the review period. Performance challenges with consistent starting and operation of the generators were noted. Additionally, placement and operation of the booster pumps, which were impacted by equipment issues, also complicated surveillance performance. Component failures occurred and were addressed according to corrective maintenance processes. Enhancement to surveillance processes combined with additional training eliminated issues with equipment lineup and surveillance performance. The past several months surveillances identified no new issues or necessary enhancements to either process or training.
The inspectors did not identify any findings or violations of NRC requirements during their review.
Observation: Review and Assessment of the Corrective Actions of Shutdown Service Water Leakage Issues from July 1, 2021, through June 30, 2022 71152A The inspectors performed a detailed review and assessment of the licensees corrective actions for leakage that were identified in the shutdown service water system over the past year. The inspectors reviews included, but were not limited to, the following ARs:
AR 4463901, "1SX208B RHR HX 1B Relief Valve Leaking"
AR 4473840, "Leak by Caused Fuel Pool Cooing Heat Exchanger to Drain"
AR 4506255, "Leak Downstream of 0SX009 B Drywell Cooler" While none of these issues caused an inoperability of their related systems, structures or components, the resident inspector office remains vigilant with issues regarding the identification and resolution of shutdown service water system degradation and impact. The inspectors did not identify any findings or violations of NRC requirements during their review.
EXIT MEETINGS AND DEBRIEFS
The inspectors verified no proprietary information was retained or documented in this report.
On July 7, 2022, the inspectors presented the integrated inspection results to Mr. T. Chalmers, Site Vice President, and other members of the licensee staff.
DOCUMENTS REVIEWED
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Corrective Action
Documents
NRC ID of Cleanliness Issues of RHR A Pump Room
04/14/2022
Procedures
CPS 3312.01
CPS1893.04M230
778 Containment East Prefire Plan
Fire Plans
CPS1893.04M231
778 Containment West Prefire Plan
Work Orders
Repair Leak Downstream of 1SX063A
04/13/2022
Division 1 Residual Heat Removal Heat Exchanger System
Outage Window
05/20/2022
Work Orders
RHR B Pump Operability
06/01/2022
Division 2 EDG Issues
04/04/2022
Unexpected MCR Ann 5067-2D Main Steam Line Pressure
Low
04/09/2022
Unusual MFLPD Online/Offline Bias Trend Seen for CPSC21
04/12/2022
Fire Pump B Running Speed HOOS
04/05/2022
Lower Containment Outer Door Equalizing Valve Found
Open
04/26/2022
Corrective Action
Documents
Division 1 Diesel Generator 12 Cylinder Lube Oil
Temperature Low
06/27/2022
Procedures
CPS 9071.01B
Diesel Driven Fire Pump B Functionality Test
0f
Work Orders
9071.01B21 OP Fire Pump B OPER
04/05/2022
Engineering
Changes
Eliminate Nuisance Alarms for SRV Acoustic Monitors
05/25/2022
Work Orders
Simple Troubleshooting Rise Notd in Drywell RF Inleakge
Division 2 Standby Gas Treatment System Cooling Water
Flow
05/12/2022
1B1 Reserve Feeder Breaker PMT
04/01/2022
9061.06C014, Div 2 VG Train Deluge Valve Operability
1SX04AA VT2 Maintenance PMT
04/13/2022
Work Orders
28' Containment Inner Door Post Maintenance Test
04/15/2022
Work Orders
OP 9080.13 DG 1B 24 HR RUN AND HOT RESTART
04/27/2022