IR 05000483/2024001

Integrated Inspection Report 05000483/2024001

ML24102A027
Person / Time
Site:	Callaway
Issue date:	04/16/2024
From:	Greg Werner NRC/RGN-IV/DORS/PBB
To:	Diya F Ameren Missouri
Proulx D
References
EPID L-2024-001-0000 IR 2024001
Download: ML24102A027 (13)

Text

April 16, 2024

SUBJECT:

CALLAWAY PLANT - INTEGRATED INSPECTION REPORT 05000483/2024001

Dear Fadi Diya:

On March 31, 2024, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at the Callaway Plant. On April 10, 2024, the NRC inspectors discussed the results of this inspection with John Beck, Vice President of Nuclear Engineering, 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, Gregory E. Werner, Chief Reactor Projects Branch B Division of Operating Reactor Safety Docket No. 05000483 License No. NPF-30

Enclosure:

As stated

Inspection Report

Docket Number: 05000483

License Number: NPF-30

Report Number: 05000483/2024001

Licensee: Ameren Missouri

Facility: Callaway Plant

Location: Steedman, MO

Inspection Dates: January 1 to March 31, 2024

Inspectors: N. Brown, Acting Senior Resident Inspector S. Schwind, Technical Assistant

Approved By: Gregory E. Werner, Chief Reactor Projects Branch B Division of Operating Reactor Safety

Enclosure

SUMMARY

The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting an integrated inspection at the Callaway Plant, 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

The Callaway plant began the inspection period at rated thermal power. On February 15, 2024, a turbine trip occurred, followed by a reactor trip. A faulted unit auxiliary transformer surge capacitor bushing was found and replaced. The unit was brought critical February 18 and entered Mode 1. On February 19 while bringing the main turbine online it experienced high vibrations and operators had to manually trip the main turbine. Operators maintained the unit at approximately 8 percent power until the main turbine was brought online February 21 at which point operators began power ascension and reached rated thermal power on February 22. The unit operated 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) (3 Samples)

The inspectors evaluated system configurations during partial walkdowns of the following systems/trains:

(1) containment spray train A on January 17, 2024

(2) essential service water train A on March 13, 2024

(3) train B swing inverter NN18 on March 11, 2024

71111.05 - Fire Protection

Fire Area Walkdown and Inspection Sample (IP Section 03.01) (5 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 area D-2 emergency diesel generator B, room 5201 on January 2, 2024

(2) fire area A-16 component cooling water A and B and heat exchanger area, rooms 1401 and 1406, on January 8, 2024

(3) fire areas A-17 and A-18, electrical penetration rooms A and B, rooms 1409 and 1410, on January 8, 2024

(4) fire area A-1, auxiliary building general area 1974', rooms 1101, 1102, 1120, 1121, 1122 and 1130 on February 26, 2024

(5) fire area A-2, safety injection and charging pump rooms A, rooms 1113 and 1114, on February 26, 2024

71111.06 - Flood Protection Measures

Flooding Sample (IP Section 03.01) (1 Sample)

(1) The inspectors evaluated internal flooding mitigation protections in the auxiliary building on January 18, 2024.

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 surveillance testing and routine operations on March 19, 2024.

Licensed Operator Requalification Training/Examinations (IP Section 03.02) (1 Sample)

(1) The inspectors observed and evaluated emergency action level exercises on March 7, 2024.

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) component cooling water pump discharge check valve EGV0016 D on January 8, 2024

71111.13 - Maintenance Risk Assessments and Emergent Work Control

Risk Assessment and Management Sample (IP Section 03.01) (5 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) emergency diesel generator A exhaust leak troubleshooting on January 17, 2024

(2) essential service water B strainer on January 26, 2024

(3) through-wall leak in component cooling water A heat exchanger essential service water drain line, February 6, 2024

(4) plant trip and emergent issues on February 18, 2024

(5) essential service water B maintenance risk informed completion time on February 29, 2024

71111.15 - Operability Determinations and Functionality Assessments

Operability Determination or Functionality Assessment (IP Section 03.01) (5 Samples)

The inspectors evaluated the licensee's justifications and actions associated with the following operability determinations and functionality assessments:

(1) component cooling water A minimum wall thickness on January 8, 2024

(2) emergency diesel generator A jacket water bolting on January 19, 2024

(3) north electrical penetration room cooler SGL15A on February 1, 2024

(4) safety injection accumulator C check valve BB8948C on February 28, 2024

(5) door seal gap DSK 36092 on March 11, 2024

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) essential service water pipe replacement on January 8, 2024

(2) safety related cooler/fan modifications on February 26, 2024

71111.24 - Testing and Maintenance of Equipment Important to Risk

The inspectors evaluated the following testing and maintenance activities to verify system operability and/or functionality:

Post-Maintenance Testing (PMT) (IP Section 03.01) (5 Samples)

(1) feedwater isolation valve D rupture disk replacement on January 4, 2024

(2) emergency diesel generator A exhaust leak troubleshooting on January 18, 2024

(3) control room air conditioning system B SGK04B on January 26, 2024

(4) essential service water B strainer on January 26, 2024

(5) through-wall leak repair in the component cooling water A heat exchanger essential service water drain line, February 6, 2024

Surveillance Testing (IP Section 03.01) (2 Samples)

(1) monthly testing of emergency diesel generator B on January 3, 2024

(2) control room A air conditioning 18-month surveillance test on February 8, 2024

71114.06 - Drill Evaluation

Additional Drill and/or Training Evolution (2 Samples)

The inspectors evaluated:

(1) team 4 emergency response organization training drill on January 11, 2024

(2) team 5 emergency response organization training drill on January 18,

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) January 2023 through December 2023

MS10: Cooling Water Support Systems (IP Section 02.09) (1 Sample)

(1) January 2023 through December 2023

BI01: Reactor Coolant System (RCS) Specific Activity Sample (IP Section 02.10) (1 Sample)

(1) January 2023 through December 2023

BI02: RCS Leak Rate Sample (IP Section 02.11) (1 Sample)

(1) January 2023 through December 2023

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 issue:

(1) check valve BB8948C failed to seat during OSP-BB-VL006, on March 31, 2024

71153 - Follow Up of Events and Notices of Enforcement Discretion Personnel Performance (IP Section 03.03)

(1) The inspectors evaluated turbine and reactor trip response on February 15, 2024.

Reporting (IP Section 03.05) (1 Sample)

The inspectors evaluated the 50.72 event report of the following issue:

(1) turbine-driven auxiliary feedwater pump auto start on March 28,

INSPECTION RESULTS

No findings were identified.

EXIT MEETINGS AND DEBRIEFS

The inspectors verified no proprietary information was retained or documented in this report.

• On April 10, 2024, the inspectors presented the integrated inspection results to John Beck, Vice President of Nuclear Engineering, and other members of the licensee staff.

DOCUMENTS REVIEWED

Inspection Type Designation Description or Title Revision or

Procedure Date

71111.04 Corrective Action Condition Reports 202401749

Documents

71111.04 Procedures OTN-EF-00001, Normal Valve Lineup Essential Service Water Pump House 32

CL0003 Train A

71111.04 Procedures OTN-EN-00001, Containment Spray System Normal Valve Lineup 13

CL0002

71111.04 Procedures OTN-NN-00002, NN18 B Train Inverter In Service Verification 0

Addendum 2

71111.05 Calculations KC-150 Fire Safety Analysis Calculation: KC-150 Fire Area: D-2 2

Diesel Generator B, Diesel Generator Building

Elevation 2000

71111.05 Engineering KC-52 Detailed Fire Modeling Report Fire Compartment: A-17 3

Evaluations Electrical Penetration Room B, Auxiliary Building,

Elevation 2026'

71111.05 Engineering KC-53 Detailed Fire Modeling Report Fire Compartment: A-18 4

Evaluations Electrical Penetration Room A, Auxiliary Building,

Elevation 2026'

71111.05 Fire Plans Fire Preplan 43

Manual

71111.05 Procedures OTO-KC-00001, Auxiliary Building 1974' - General Area 1

Addendum A-01

71111.05 Procedures OTO-KC-00001, Auxiliary Building 2026' - General Area 1

Addendum A-16

71111.05 Procedures OTO-KC-00001, Auxiliary Building 2026' - South Electrical Penetration Room 1

Addendum A-17

71111.05 Procedures OTO-KC-00001, Auxiliary Building 2026' - North Electrical Penetration Room1

Addendum A-18

71111.05 Procedures OTO-KC-00001, Diesel Generator Building 2000' - 'B' Diesel Generator Room1

Addendum D-02

71111.05 Procedures OTO-KC-0001, Auxiliary Building - 1974' Train 'A' ECCS Pump Rooms 1

Addendum A-02

Inspection Type Designation Description or Title Revision or

Procedure Date

71111.06 Corrective Action Condition Reports 201402680, 202400404

Documents

71111.06 Miscellaneous ULDBD-FLOOD-Topical Area - Internal Flooding 1

001

71111.11Q Miscellaneous T61.0810 8 EAL Exercises 02/09/2024

71111.11Q Procedures APA-ZZ-00003 Shift Relief and Turnover 30

71111.11Q Procedures ODP-ZZ-00001, Annunciator Response 38

Addendum 1

71111.12 Corrective Action Condition Reports 202202985

Documents

71111.12 Miscellaneous Bolting Manual 20

71111.12 Miscellaneous OQCM Operational Quality Control Manual 35

71111.12 Work Orders Jobs 20201934

71111.13 Corrective Action Condition Reports 202001790, 202307764, 202400556, 202400664,

Documents 202400845, 202401065, 202401089, 202401134,

2401145, 202401164, 202401177, 202401213,

2401217, 202401255, 202401258

71111.13 Miscellaneous Summary of the Weekly Schedule 01/11/2024

71111.13 Miscellaneous RICT-2024-01 ESW Strainer RICT 0

71111.13 Miscellaneous RICT-2024-0226 ESW RICT 0

71111.13 Procedures APA-ZZ-00315, Risk Informed Completion Time (RICT) Program 2

Appendix D

71111.13 Work Orders Jobs 18001654, 24000408

71111.15 Corrective Action Condition Reports 202302380, 202400119, 202400391, 202000586,

Documents 202400593, 202400602, 202400673, 202400788

2400915, 202401634

71111.15 Drawings M-018-00309 Emergency Diesel Generator System 154

71111.15 Procedures APA-ZZ-00750 Hazard Barrier Program 30

71111.15 Procedures EDP-ZZ-01121 Raw Water System Predictive Performance Program 27

71111.15 Work Orders Jobs 22506696, 18001654, 23503549

71111.18 Corrective Action Condition Reports 202307723, 202400566

Documents

71111.18 Engineering MP 21-0011 RFR 210038 - Modification Request for Speed Changes for 1

Changes Safety Related Belt Driven Fans

Inspection Type Designation Description or Title Revision or

Procedure Date

71111.18 Engineering MP 23-0039 Replace Section of EF-7-HBC Spool 4 with Stainless Steel 0

Changes

71111.18 Engineering EF-5069-SCD Essential Service Water (EF) System Categorization 1

Evaluations Document

71111.18 Procedures APA-ZZ-05069 10 CFR 50.69 Program Categorization and Alternative 30

Treatment

71111.18 Work Orders Jobs 23002810

71111.24 Corrective Action Condition Reports 202400373, 202400391, 202400409, 202400469,

Documents 202400497, 202400556, 202400939

71111.24 Miscellaneous Summary of the Weekly Schedule 01/11/2024

71111.24 Procedures APA-ZZ-00322, Post-Maintenance Test Program 38

Appendix E

71111.24 Procedures APA-ZZ-00661 Administration of Welding 22

71111.24 Procedures MSE-GK-0004A Refrigeration Cycle and Air Flow for SGK04A 7

71111.24 Procedures MSM-ZZ-QV004 Rupture Disc Replacement for FWIV and MSIV 2

71111.24 Procedures OSP-NE-0001A Standby Diesel Generator A Periodic Tests 71

71111.24 Procedures OSP-NE-0001B Standby Diesel Generator B Periodic Tests 70

71111.24 Work Orders Jobs 19507350, 18001654, 24000408, 22509342, 20512567,

23514351, 23002086, 22508560

71114.06 Miscellaneous 2024 EP WRO Training Drill Scenario

71151 Miscellaneous Cooling Water Systems Performance Indicator Data for

January 2023 through December 2023

71151 Miscellaneous Reactor Coolant System Specific Activity Performance

Indicator Data for January 2023 through December 2023

71151 Miscellaneous Reactor Coolant System Leakage Performance Indicator

Data for January 2023 through December 2023

71151 Miscellaneous Emergency AC Power Systems Performance Indicator Data

for January 2023 through December 2023

71152A Corrective Action Condition Reports 202203677, 202203737, 202307958, 202308035,

Documents 202308066, 202308073, 202308090, 202308108,

2308132, 202308194, 202308302, 202308315,

2308831, 202308855, 202308977, 202309098

Inspection Type Designation Description or Title Revision or

Procedure Date

71153 Corrective Action Condition Reports 202001790, 202301129, 202307764, 202400816,

Documents 202401065, 202401089, 202401134, 202401137,

2401145, 202401164, 202401177, 202401213,

2401217, 202401255, 202401258, 202402078,

2402247

71153 Procedures OTG-ZZ-00008 Normal Unit Recovery Guideline Following Reactor Trip 24

11