IR 05000461/2022002

Integrated Inspection Report 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: NPF-62

Report Number: 05000461/2022002

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

Enclosure

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.

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 71152A Equipment Testing Issues July 1, 2021, through June 30, 2022 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 71152A Service Water Leakage Issues from July 1, 2021, through June 30, 2022 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 Type Designation Description or Title Revision or

Procedure Date

71111.04 Corrective Action AR 4493099 NRC ID of Cleanliness Issues of RHR A Pump Room 04/14/2022

Documents

Procedures CPS 3312.01 Residual Heat Removal 48

71111.05 Fire Plans CPS1893.04M230 778 Containment East Prefire Plan 5

CPS1893.04M231 778 Containment West Prefire Plan 5

71111.12 Work Orders WO 5206687 Repair Leak Downstream of 1SX063A 04/13/2022

71111.13 Work Orders WO 4956908 Division 1 Residual Heat Removal Heat Exchanger System 05/20/2022

Outage Window

WO 5237606 RHR B Pump Operability 06/01/2022

71111.15 Corrective Action AR 4489696 Division 2 EDG Issues 04/04/2022

Documents AR 4491835 Unexpected MCR Ann 5067-2D Main Steam Line Pressure 04/09/2022

Low

AR 4493041 Unusual MFLPD Online/Offline Bias Trend Seen for CPSC21 04/12/2022

AR 4493580 Fire Pump B Running Speed HOOS 04/05/2022

AR 4495830 Lower Containment Outer Door Equalizing Valve Found 04/26/2022

Open

AR 4507841 Division 1 Diesel Generator 12 Cylinder Lube Oil 06/27/2022

Temperature Low

Procedures CPS 9071.01B Diesel Driven Fire Pump B Functionality Test 0f

Work Orders WO 5239919 9071.01B21 OP Fire Pump B OPER 04/05/2022

71111.18 Engineering EC 636596 Eliminate Nuisance Alarms for SRV Acoustic Monitors 05/25/2022

Changes

Work Orders WO 5262383 Simple Troubleshooting Rise Notd in Drywell RF Inleakge 0

71111.19 Work Orders WO 4806063-11 Division 2 Standby Gas Treatment System Cooling Water 05/12/2022

Flow

WO 4974727-05 1B1 Reserve Feeder Breaker PMT 04/01/2022

WO 5100619 9061.06C014, Div 2 VG Train Deluge Valve Operability

WO 5206687-07 1SX04AA VT2 Maintenance PMT 04/13/2022

WO 5223317-02 828' Containment Inner Door Post Maintenance Test 04/15/2022

71111.22 Work Orders WO 5077841 OP 9080.13 DG 1B 24 HR RUN AND HOT RESTART 04/27/2022

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