IR 05000456/2024004
| ML25031A097 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 02/03/2025 |
| From: | Dariusz Szwarc NRC/RGN-III/DORS/RPB3 |
| To: | Rhoades D Constellation Energy Generation, Constellation Nuclear |
| References | |
| IR 2024004 | |
| Download: ML25031A097 (1) | |
Text
SUBJECT:
BRAIDWOOD STATION - INTEGRATED INSPECTION REPORT 05000456/2024004 AND 05000457/2024004
Dear David Rhoades:
On December 31, 2024, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Braidwood Station. On January 14, 2025, the NRC inspectors discussed the results of this inspection with D. Hudak, Plant Manager and other members of your staff.
The results of this inspection are documented in the enclosed report.
One finding of very low safety significance (Green) is documented in this report. This finding involved a violation of NRC requirements. We are treating this violation as a non-cited violation (NCV) consistent with Section 2.3.2 of the Enforcement Policy.
A licensee-identified violation which was determined to be of very low safety significance is documented in this report. We are treating this violation as a non-cited violation (NCV)
consistent with Section 2.3.2 of the Enforcement Policy.
If you contest the violations or the significance or severity of the violations documented in this inspection report, you should provide a response within 30 days of the date of this inspection report, with the basis for your denial, to the U.S. Nuclear Regulatory Commission, ATTN: Document Control Desk, Washington, DC 20555-0001; with copies to the Regional Administrator, Region III; the Director, Office of Enforcement; and the NRC Resident Inspector at Braidwood Station.
February 3, 2025 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, Dariusz Szwarc, Chief Reactor Projects Branch 3 Division of Operating Reactor Safety Docket Nos. 05000456 and 05000457 License Nos. NPF-72 and NPF-77
Enclosure:
As stated
Inspection Report
Docket Numbers:
05000456 and 05000457
License Numbers:
Report Numbers:
05000456/2024004 and 05000457/2024004
Enterprise Identifier:
I-2024-004-0053
Licensee:
Constellation Energy Generation, LLC
Facility:
Braidwood Station
Location:
Braceville, IL
Inspection Dates:
October 01, 2024, to December 31, 2024
Inspectors:
R. Bowen, Illinois Emergency Management Agency
R. Farmer, Health Physicist
J. Heimke, Project Engineer
T. Hooker, Health Physicist
E. Kokkinis, Project Engineer
J. Kutlesa, Senior Emergency Preparedness Inspector
E. Magnuson, Reactor Inspector
T. McGowan, Emergency Preparedness Inspector
J. Robbins, Program Manager
P. Smagacz, Senior Resident Inspector
J. Steffes, Senior Resident Inspector
Approved By:
Dariusz Szwarc, Chief
Reactor Projects Branch 3
Division of Operating Reactor Safety
SUMMARY
The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting an integrated inspection at Braidwood 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. A licensee-identified non-cited violation is documented in report section: 71111.08P.
List of Findings and Violations
Failure to Implement Preventive Maintenance Testing on DC Breakers Cornerstone Significance Cross-Cutting Aspect Report Section Mitigating Systems Green NCV 05000456,05000457/2024004-02 Open/Closed None 71152A A finding of very low safety significance (Green) and an associated NCV of TS 5.4.1,
Procedures, was NRC identified, for the failure to implement component replacement or trip testing as specified in Preventive Maintenance Change Request (PMCR) 83591. As a result, degrading performance went undetected and on April 16, 2024, 1DC05E-AF1 breaker tripped during charger capacity testing.
Additional Tracking Items
Type Issue Number Title Report Section Status URI 05000456,05000457/20 24004-01 Failure to Correctly Install Essential Service Water Strainer Baskets 71111.12 Open URI 05000456,05000457/20 24004-03 Failure to Maintain Emergency Diesel Generator (EDG) Lube Oil Pressure During Strainer Changeout for EDG Mission Time 71152A Open LER 05000457/2023-001-00 LER 2023-001-00 for Braidwood Station, Unit 2,
Train B Auxiliary Feedwater Pump was inoperable due to Degraded Oil in the Crank Case 71153 Closed
PLANT STATUS
Unit 1 began the inspection period operating at full power. With the exception of minor reductions in power to support scheduled testing activities and load changes requested by the transmission system dispatcher, the unit remained operating at or near full power for the entire inspection period.
Unit 2 began the inspection period operating at 96 percent power due to coasting down for a scheduled refueling outage. On October 7, the unit was taken offline to begin scheduled refueling outage A2R24. On October 24, 2024, the unit achieved criticality and entered Mode 1 on October 25, 2024. The unit reached full power on October 27, 2024. With the exception of minor reductions in power to support scheduled testing activities and load changes requested by the transmission system dispatcher, the unit remained operating at or near full power for the rest 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
71111.01 - 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 seasonal cold temperatures for the following systems:
1. Diesel and electric fire pumps and refueling water storage tank heat tracing
during the week ending December 14, 2024
71111.04 - Equipment Alignment
Partial Walkdown Sample (IP Section 03.01) (4 Samples)
The inspectors evaluated system configurations during partial walkdowns of the following systems/trains:
- (1) Unit 1 and 2 spent fuel pool cooling and clean-up systems while protected for full core offload during A2R24 during the week ending October 19, 2024
- (2) Unit 2 safety injection (SI) Train A while protected as a makeup train during A2R24 during the week ending October 19, 2024
- (3) Unit 1 auxiliary feedwater (AF) Train A during Train B testing during the week ending November 9, 2024
- (4) Unit 1 diesel generator (DG) Train A during the week ending December 21, 2024
Complete Walkdown Sample (IP Section 03.02) (1 Sample)
- (1) The inspectors evaluated system configurations during a complete walkdown of the Unit 2 residual heat removal (RH) system during the weeks ending October 5 through November 2, 2024
71111.05 - Fire Protection
Fire Area Walkdown and Inspection Sample (IP Section 03.01) (7 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 1.3-2; Unit 2 containment 426' elevation, containment upper area during the week ending October 12, 2024
- (2) Fire Zone 12.1-0; fuel handling building 426' elevation during the week ending October 12, 2024
- (3) Fire Zone 8.5-2; turbine building 426' elevation, verified fire system impairment permits for scaffolds that may impair fire suppression spray pattern during the week ending October 12, 2024
- (4) Fire Zone 5.6-2; auxiliary building 451' elevation division 21 miscellaneous electrical equipment and battery room during the week ending October 19, 2024
- (5) Fire Zones 9.2-2 and 9.3-2; DG 401' elevation, diesel generator room 2A and day tank room during the week ending October 19, 2024
- (6) Fire Zone 1.1-2; Unit 2 containment 401' elevation, Unit 2 containment missile shield during the week ending October 19, 2024
- (7) Fire Zone 11.6-2; auxiliary building 426' elevation, division 22 electrical penetrations area on week ending October 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 Unit 2 diesel fuel oil storage tank rooms during the week ending December 28, 2024
===71111.08P - Inservice Inspection Activities (PWR) The inspectors verified that the reactor coolant system boundary, reactor vessel internals, risk-significant piping system boundaries, and containment boundary are appropriately monitored for degradation and that repairs and replacements were appropriately fabricated, examined, and accepted by reviewing the following activities in Unit 2 during refueling outage A2R24 from October 7, 2024, to October 16, 2024.
PWR Inservice Inspection Activities Sample - Nondestructive Examination and Welding Activities (IP Section 03.01)===
The inspectors verified that the following nondestructive examination and welding activities were performed appropriately:
- (1) Ultrasonic Examination
- Auxiliary Feedwater System Piping Weld, 2AF-06-06, Cat. R-A, Item R1.11-2
- Reactor Coolant System (RCS) Piping Welds, 2RC-32-11, 16 and 17, Cat. R-A, Item R1.20-4 Surface Examination
- Dye Penetrant (PT) Exam of RH Pump Welded Attachments, 2-RHP-01-RHP-01, 02 and 03, Cat. C-C, Item C3.30 Visual Examination
- RPV Bottom Head Visual Exam of Bottom Mounted Instrument (BMI)
Penetrations and Bare Metal Surface, Code Case N-722 Exam, Item B15.80
- VT-3 of 2AF04032V Variable Spring Can, Cat. F-A, Item F1.20C
- VT-3 of 2AF07036R Rigid Pipe Support, Cat. F-A, Item F1.20A Welding Activities
Base Metal Repair of 2VP01AD Chiller Divider Plate, Work Order (WO) 05189536-19 PWR Inservice Inspection Activities Sample - Vessel Upper Head Penetration Inspection
Activities (IP Section 03.02) (1 Sample)
The inspectors verified that the licensee conducted the following vessel upper head penetration inspections and addressed any identified defects appropriately:
(1)
- Bare Metal Visual (BMV) Examination of RPV Upper Head Surface Penetrations PWR Inservice Inspection Activities Sample - Boric Acid Corrosion Control Inspection Activities (IP Section 03.03) (1 Sample)
The inspectors verified the licensee is managing the boric acid corrosion control program through a review of the following evaluations:
(1)
- Boric Acid Leakage on 2CV01PB, AR 4742589
- Boric Acid Leakage on 2RY03MA, AR 4675667
71111.11A - Licensed Operator Requalification Program and Licensed Operator Performance
Requalification Examination Results (IP Section 03.03) (1 Sample)
- (1) The inspectors reviewed and evaluated the licensed operator examination failure rates for the requalification annual operating examinations and biennial comprehensive written examinations administered between August 22, 2024, and September 27, 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 reactor shutdown and fuel moves during the week ending October 12, 2024
Licensed Operator Requalification Training/Examinations (IP Section 03.02) (1 Sample)
- (1) Observation of the performance of a complex casualty graded scenario by a crew of licensed plant operators in the facilitys simulator on December 10, 2024
71111.12 - Maintenance Effectiveness
Maintenance Effectiveness (IP Section 03.01) (4 Samples)
The inspectors evaluated the effectiveness of maintenance to ensure the following structures, systems, and components (SSCs) remain capable of performing their intended function:
- (1) Maintenance effectiveness review associated with the AF system during the weeks ending November 16 through November 23, 2024
- (2) Maintenance effectiveness review associated with the essential service water (SX)system due to a failure of the 2B SX strainer on November 21, 2024, as documented in Issue Report (IR) 4818984
- (3) Maintenance effectiveness review associated with the emergency diesel generators (EDGs) due to delayed maintenance work windows during the weeks ending November 30 through December 14, 2024
- (4) Maintenance effectiveness review associated with the steam generator (SG) power operated relief valves (PORVs) due to 2C SG PORV failure as documented in IR 4820817 during the weeks ending December 14 through December 21, 2024
Quality Control (IP Section 03.02) (1 Sample)
The inspectors evaluated the effectiveness of maintenance and quality control activities to ensure the following SSC remains capable of performing its intended function:
- (1) Maintenance effectiveness, performance history, and quality reviews for the diesel driven AF pump, with specific emphasis on the commercial grade dedication process following identification of failed fuel injectors, as documented in IR 4763519 during the weeks ending November 9 through November 16, 2024
71111.13 - Maintenance Risk Assessments and Emergent Work Control
Risk Assessment and Management Sample (IP Section 03.01) (6 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) Review and evaluation of the risk and activities associated with Unit 2 shutdown for a refueling outage including lowered water inventory in A2R24 during the week ending October 12, 2024
- (2) Review and evaluation of the risk and activities associated with 2B SX and 2B AF emergent work in A2R24 during the week ending October 26, 2024
- (3) Review and evaluation of the risk and activities associated with conservative operations alerts issued by PJM during the week ending November 9, 2024
- (4) Review and evaluation of the risk and activities associated with 0B auxiliary building HVAC plenum maintenance and testing during the week ending November 16, 2024
- (5) Review and evaluation of the risk due to emergent work on the 2B SX strainer as documented in IR 4818984 during the weeks ending November 23 through 30, 2024
- (6) Review and evaluation of the risk associated with 2CV8385B and winter weather conditions during the week ending December 21, 2024
71111.15 - Operability Determinations and Functionality Assessments
Operability Determination or Functionality Assessment (IP Section 03.01) (5 Samples)
The inspectors evaluated the licensees justifications and actions associated with the following operability determinations and functionality assessments:
- (1) Unit 2 reactor trip bypass breaker B position indication issue noted during SI testing as Documented in IR 4807493 during the week ending October 19, 2024
- (2) Evaluation of the operability of the auxiliary building ventilation system following the 0VA437Y damper failing to open during surveillance testing, as documented in IR
===4807520 during the week ending October 19, 2024
- (3) Evaluation of the operability of the reactor coolant system (RCS) following questions regarding leakage from valve 2RC003A, as documented in IR 4810722 during the week ending October 26, 2024
- (4) Evaluation of the operability of the Unit 2 chemical and volume control (CV) system following questions regarding a failed post-maintenance test (PMT), as documented in IR 4816999 during the week ending November 16, 2024
- (5) Evaluation of the operability of the Unit 2 pressurizer heaters following unexpected annunciators as documented in IR 4822139 during the week ending December 21, 2024
71111.18 - Plant Modifications
Temporary Modifications and/or Permanent Modifications (IP Section 03.01 and/or 03.02)
=
The inspectors evaluated the following temporary or permanent modifications:
- (1) Review of permanent plant modification per Engineering Change (EC) 638351:
Feedwater Regulating Valve Dual Positioner Unit 2 during the weeks ending October 19 through November 2, 2024
- (2) Review of permanent plant modification per EC 639486: 2A Iso Phase Bus Duct Fan and Motor Replacement during the week ending November 2, 2024
- (3) Review of permanent plant modification per EC 633477: Unit 1 UAT Replacement with SGB-SMT Transformers
71111.20 - Refueling and Other Outage Activities
Refueling/Other Outage Sample (IP Section 03.01) (1 Sample)
- (1) The inspectors evaluated refueling outage A2R24 activities from October 7 to October 25, 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) (11 Samples)
- (1) Functional and operational testing of the diesel fire pump following installation, as documented in WO 5278379 during the week ending October 5, 2024
- (2) Functional and operational testing of SSPS following A2R24, as documented in WO 5372619 during the week ending October 26, 2024
- (3) Functional and operational testing of the manual reactor trip breakers following A2R24, as documented in WO 5367132 during the week ending October 26, 2024
- (4) Functional and operational testing of the 2B AF pump following A2R24, as documented in WO 5222017 during the weeks ending October 26 through November 2, 2024
- (5) Functional and operational testing of 2A EDG sequencer following refuel outage A2R24, as documented in WO 5221868 during the week ending November 2, 2024.
- (6) Functional and operational testing of the 2B RH system following A2R24 maintenance, as documented in WO 5366484 during the week ending November 2, 2024
- (7) Functional and operational testing of the 2A AF pump following A2R24, as documented in WO 5221838 during the week ending November 2, 2024
- (8) Functional and operational testing of 2AF005A and B following valve actuator rebuild, as documented in WO 5222080 and 5222077 during the week ending November 2, 2024
- (9) Functional and operational testing of 2RH8716B following maintenance, as documented in WO 5221799 during the week ending November 2, 2024
- (10) Core verification following A2R24 as documented in WO 5362031 during the weeks ending November 9 and November 16, 2024
- (11) Functional and operational testing of the 2B SX system after emergent maintenance on the strainer, as documented in WO 5600236 during the week ending November 30, 2024
Surveillance Testing (IP Section 03.01) (4 Samples)
- (1) Main steam safety valve testing, as documented in WO 5364630 during the week ending October 5, 2024
- (2) Full flow surveillance testing of the AF system, as documented in WO 5360923 during the week ending October 5, 2024
- (3) Anticipated transient without scram Refueling Outage End to End Surveillance, as documented in WO 5361594 during the week ending October 12, 2024
- (4) Calibration of the 1A AF suction pressure switch, as documented in WO 5353821 during the week ending November 9, 2024
Containment Isolation Valve (CIV) Testing (IP Section 03.01) (1 Sample)
- (1) Local leak rate testing of primary containment isolation valve 2VQ005B, as documented in WO 5053661 during the week ending October 12, 2024
Reactor Coolant System Leakage Detection Testing (IP Section 03.01) (1 Sample)
- (1) Review and evaluation of Unit 1 reactor coolant system (RCS) unidentified leakage following a small increase in the normal periodic calculated leakage, as documented in IR 4808652 during the week ending November 9, 2024
71114.04 - Emergency Action Level and Emergency Plan Changes
Inspection Review (IP Section 02.01-02.03) (1 Sample)
- (1) The inspectors evaluated the following submitted Emergency Action Level and Emergency Plan changes.
- EP-AA-1001, Constellation Radiological Emergency Plan Annex for Braidwood Station, Revision 36
- EP-AA-1001 Addendum 1, Braidwood Station On-Shift Staffing Technical Basis, Revision 3
- EP-AA-1001 Addendum 2, Braidwood Evacuation Time Estimates, Revision 2
- EP-AA-120-1001, BRW Emergency Plan Revised for IPAWS Implementation, Evaluation No. 23-34 This evaluation does not constitute NRC approval.
RADIATION SAFETY
71124.01 - Radiological Hazard Assessment and Exposure Controls
Radiological Hazards Control and Work Coverage (IP Section 03.04) (1 Sample)
The inspectors evaluated the licensees control of radiological hazards for the following radiological work:
- (1) Removal of the Unit 2 reactor head
71124.03 - In-Plant Airborne Radioactivity Control and Mitigation
Permanent Ventilation Systems (IP Section 03.01) (1 Sample)
The inspectors evaluated the configuration of the following permanently installed ventilation systems:
Self-Contained Breathing Apparatus for Emergency Use (IP Section 03.04) (1 Sample)
- (1) The inspectors evaluated the licensees use and maintenance of self-contained breathing apparatuses.
71124.04 - Occupational Dose Assessment
Source Term Characterization (IP Section 03.01) (1 Sample)
- (1) The inspectors evaluated licensee performance as it pertains to radioactive source term characterization.
External Dosimetry (IP Section 03.02) (1 Sample)
- (1) The inspectors evaluated how the licensee processes, stores, and uses external dosimetry.
Internal Dosimetry (IP Section 03.03) (2 Samples)
The inspectors evaluated the following internal dose assessments:
- (1) Intake Investigation 2022
- (2) Intake Investigation 2023
Special Dosimetric Situations (IP Section 03.04) (2 Samples)
The inspectors evaluated the following special dosimetric situations:
- (1) Reactor Head Inspection EDEX
- (2) Various DPWs
OTHER ACTIVITIES - BASELINE
===71151 - Performance Indicator Verification The inspectors verified licensee performance indicators submittals listed below:
BI01: Reactor Coolant System (RCS) Specific Activity Sample (IP Section 02.10)===
- (1) Unit 1 (January 1, 2023, through August 31, 2024)
- (2) Unit 2 (January 1, 2023, through August 31, 2024)
BI02: RCS Leak Rate Sample (IP Section 02.11) (2 Samples)
- (1) Unit 1 (October 1, 2023, through September 30, 2024)
- (2) Unit 2 (October 1, 2023, through September 30, 2024)
OR01: Occupational Exposure Control Effectiveness Sample (IP Section 02.15) (1 Sample)
- (1) January 1, 2023, through June 30, 2024 PR01: Radiological Effluent Technical Specifications/Offsite Dose Calculation Manual Radiological Effluent Occurrences (RETS/ODCM) Radiological Effluent Occurrences Sample (IP Section 02.16) (1 Sample)
- (1) January 1, 2023, through June 30, 2024
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 stations corrective actions for low EDG lube oil pressures during 1A EDG surveillances during the weeks ending September 29 through December 27, 2024
- (2) Review and assessment of the stations corrective actions for misalignments of auxiliary feedwater diesel turbo outlet hose clamps during the week ending December 27, 2024
- (3) Review and assessment of the stations corrective actions for DC breaker 111 tripped during battery charger testing during the week ending December 14, 2024
- (4) Review and assessment of the stations corrective actions for manual isolation valve 1D failed to close during Train B actuation test during the week ending December 14, 2024
71152S - Semiannual Trend Problem Identification and Resolution Semiannual Trend Review (Section 03.02)
- (1) The inspectors reviewed the licensees corrective action program to identify potential trends in unidentified leakage rates that might be indicative of a more significant safety issue.
71153 - Follow-up of Events and Notices of Enforcement Discretion Reporting (IP Section 03.05)
The inspectors evaluated the following licensee event reports (LERs):
- (1) Retraction of LER 05000457/2023-001-00, Unit 2 Train B Auxiliary Feedwater Pump was Inoperable due to Degraded Oil in Crank Case, (ADAMS Accession No. ML23321A224). This LER was submitted and subsequently retracted by licensee correspondence Cancellation of Licensee Event Report 2023-001-00 Unit 2 Train B Auxiliary Feedwater Pump was Inoperable due to Degraded Oil in the Crank Case, dated April 26, 2024, (ADAMS Accession No. ML24117A344). This LER is Closed.
INSPECTION RESULTS
Licensee-Identified Non-Cited Violation 71111.08P This violation of very low safety significance was identified by the licensee and has been entered into the licensee corrective action program and is being treated as a non-cited violation, consistent with Section 2.3.2 of the Enforcement Policy.
Violation: Title 10 of the Code of Federal Regulations, Part 50, Section 50.55a(g)(6)(ii)(E),
Augmented ISI requirements: Reactor coolant pressure boundary visual inspections, stated,
- (1) All licensees of pressurized water reactors must augment their inservice inspection program by implementing ASME Code Case N-722-1, subject to the conditions specified in paragraphs (g)(6)(ii)(E)(2) through
- (4) of this section. The inspection requirements of ASME Code Case N-722-1 do not apply to components with pressure retaining welds fabricated with Alloy 600/82/182 materials that have been mitigated by weld overlay or stress improvement.
The licensees RPV bottom head nozzle-to-thimble guide tube welds were fabricated with Alloy 82 material that have not been mitigated by weld overlay or stress improvement.
ASME Code Case N-722-1 required, in part, that the additional examinations of Table 1 shall be performed for pressurized water reactor plants having partial or full penetration welds in Class 1 components fabricated with Alloy 600/82/182 material.
Table 1 of Code Case N-722-1 required, in part, that the instrument connections identified as Item No. B15.100 be visually examined once per interval.
Contrary to the above, as of October 3, 2024, the licensees inservice inspection program failed to comply with the requirements of ASME Code Case N-722-1. Specifically, the licensee failed to complete visual examination of all Class 1 nozzle-to-thimble guide tube welds to satisfy the requirements of N-722-1. The conditions specified in paragraphs (g)(6)(ii)(E)(2) through
- (4) of Section 50.55a did not apply.
Significance/Severity: Green. The inspectors assessed the significance of the finding using IMC 0609 Appendix A, The Significance Determination Process (SDP) for Findings At-Power. The inspectors answered No to questions, After a reasonable assessment of degradation, could the finding result in exceeding the reactor coolant system (RCS) leak rate for a small LOCA (leakage in excess of normal makeup)? and After a reasonable assessment of degradation, could the finding have likely affected other systems used to mitigate LOCA (e.g., Interfacing System LOCA)? under Section A of Exhibit 1 - Initiating Events Screening Questions. Therefore, the finding was screened as having very low safety significance (Green).
Corrective Action References: AR 4806584 Unresolved Item (Open)
Failure to Correctly Install Essential Service Water Strainer Baskets URI 05000456,05000457/2024004-01 71111.12
Description:
On November 21, 2024, in preparations for a 2B essential service water (SX) surveillance, operations attempted to manually backwash the 2B SX strainer. Operations personnel identified the sheer pin was broken and the motor was spinning, however, the shaft for the strainer did not rotate. Before the attempt, the thermals for the strainer motor were found tripped and needed to be reset. The licensee declared the 2B SX system inoperable due to the inoperability of the backwash function of the strainer and entered a 72-hour action for LCO 3.7.8. The subsequent investigation revealed set screws that hold the upper and lower baskets of the strainer apart became undone and allowed the baskets to impact each other resulting in a mechanical lock of the strainer system. A review of the maintenance procedures for the SX strainers call out using spacers vice set screws. The licensee committed to fully investigate this incident by performing a CAPE which would not be concluded until after the inspection period. Therefore, the inspectors are opening an Unresolved Item (URI) until the inspectors can review the CAPE and make a final determination. The strainer was repaired with the correct spacer and returned to service.
Planned Closure Actions: The licensees review of the event via a CAPE will be completed in the 1st quarter of 2025. The inspectors will review the evaluation and make a final determination in the 1st quarter of 2025.
Licensee Actions: The licensee chartered a formal equipment review evaluation, and the licensee has generated extent of condition work orders to evaluate the other service water strainers that may have been installed with set screws instead of spacers.
Corrective Action References: AR 4818984; 2B SX Strainer Not Rotating Failure to Implement Preventive Maintenance Testing on DC Breakers Cornerstone Significance Cross-Cutting Aspect Report Section Mitigating Systems Green NCV 05000456,05000457/2024004-02 Open/Closed None 71152A A finding of very low safety significance (Green) and an associated non-cited violation (NCV)of Technical Specification (TS) 5.4.1, Procedures, was NRC identified, for the failure to implement component replacement or trip testing as specified in Preventive Maintenance Change Request (PMCR) 83591. As a result, degrading performance went undetected and on April 16, 2024, 1DC05E-AF1 breaker tripped during charger capacity testing.
Description:
On April 16, 2024, 1DC05E-AF1 breaker tripped during charger capacity testing.
Subsequently, the breaker was replaced and passed post-maintenance testing. At the time of the failure, Unit 1 was in a refueling outage, Bus 111 had already been cross-tied to Bus 211 as battery capacity testing was a planned maintenance activity.
In response to NRC inspectors questions, as documented in IR 4789778, Deviation from PCM (Performance Centered Maintenance) Template not documented, subsequent evaluations identified that breakers in similar locations on both divisions of DC power on both units had not been replaced or tested in accordance with PCM template for safety-related, non-critical, 125 VDC molded case circuit breakers (MCCBs).
To determine the reason why the MCCBs were not being tested, a review of maintenance records was performed. On November 13, 2013, the licensee implemented PMCR 83591 in response to fleet operating experience.
This PMCR created new PM tasks to replace/trip test the 125VDC ESF (Engineered Safety Feature) [&] Non-ESF MCCBs. The PMCR also directed the task to trip test 250 and 125 VDC Multiple Pole MCCB on a 6Y frequency for breakers classified as 3 and a 10Y frequency for breakers classified as 7 [non-critical]. All 125VDC breakers were included in the PM addition. The PM also provided associated work order numbers and explicitly listed components impacted by the PMCR. MCCBs 1DC05E-AF1, 1DC06E-AF1, 2DC05E-AF1, and 2DC06E-AF1 were not on the list. These breakers were located between the battery charger and the battery on each DC bus. The inspectors concluded that the likely cause of MCCBs 1DC05E-AF1, 1DC06E-AF1, 2DC05E-AF1, and 2DC06E-AF1 not being replaced or trip tested was that these breakers were not on the list of explicitly identified components.
These breakers are safety-related, 125 VDC Multiple Pole MCCBs classified as 7, non-critical, and each should have been on the list contained in PMCR 83591.
The preventive maintenance process allows for deviations from the template, but the licensee failed to identify an approved deviation that would support the exclusion of MCCBs 1DC05E-AF1, 1DC06E-AF1, 2DC05E-AF1, and 2DC06E-AF1 from PMCR 83591.
Corrective Actions: Corrective actions included replacing breaker 1DC05E-AF1 and planned to replace AF1 breaker on each division of DC power when able and establishing the preventive maintenance frequency in accordance with the PCM template.
Corrective Action References: AR 4766946; OSP-A 1DC05E-AF1 Tripped During Charger 111 Capacity Test
Performance Assessment:
Performance Deficiency: The inspectors concluded that the failure to replace or trip test MCCBs in accordance with PMCR 83591, constituted a performance deficiency that warranted further evaluation.
Screening: The inspectors determined the performance deficiency was more-than-minor because if left uncorrected, it would have the potential to lead to a more significant safety concern. Specifically, failing to replace or trip test the same breaker location across both divisions of DC power on each unit creates the potential for an undetected age-related degradation that could affect multiple divisions.
Significance: The inspectors assessed the significance of the finding using IMC 0609 Appendix G, Shutdown Operations Significance Determination Process. The inspectors answered No to questions 1 thru 8 where the issue screened as having very low risk significance, Green.
Cross-Cutting Aspect: None
Enforcement:
Violation: TS 5.4.1, Procedures, requires that written procedures shall be established, implemented, and maintained as recommended in Regulatory Guide 1.33, Revision 2, Appendix A, February 1978. Regulatory Guide 1.33, Appendix A, Section 9, Procedures for Performing Maintenance, specifically addresses the need to have appropriate procedures for preventive maintenance that can affect the performance of safety-related equipment.
The licensee developed procedure ER-AA-200, Preventive Maintenance Program, to implement that regulatory requirement and WC-AA-120, Preventive Maintenance Database Revision Requirements to manage changes to PM requirements. PMCR 83591 was implemented using guidance found in WC-AA-120.
Contrary to the above, since November 13, 2013, and until the failure on April 16, 2024, the licensee failed to implement component replacement or trip testing as specified in PMCR 83591. Specifically, the licensee failed to replace or perform trip setpoint testing of molded case circuit breakers 1DC05E-AF1, 1DC06E-AF1, 2DC05E-AF1, and 2DC06E-AF1.
As a result, degrading performance went undetected and on April 16, 2024, 1DC05E-AF1 breaker tripped during battery capacity testing.
Enforcement Action: This violation is being treated as a non-cited violation, consistent with Section 2.3.2 of the Enforcement Policy.
Unresolved Item (Open)
Failure to Maintain Emergency Diesel Generator (EDG)
Lube Oil Pressure During Strainer Changeout for EDG Mission Time URI 05000456,05000457/2024004-03 71152A
Description:
The inspectors reviewed EDG operating logs from September, October, and November of 2022. The inspectors found the lube oil pressure was stable in September but experienced a step change drop in pressure during the October monthly run followed by a trending decrease in pressure during the 24-hour endurance run that occurred on November 6, 2022.
The inspectors performed simplified calculations based on the pressure decrease starting from the end of the monthly run in September through the 24-hour endurance run in November. The inspectors found the EDG would have reached the 30 psi minimum pressure limit established by the diesel vendor approximately two days into the seven day mission time.
Recent inspector questions have led to the discovery of a calculation indicating a minimum pressure of 15 psi. However, the inspectors questioned if strainer cleaning at the 30 psi limit would make lube oil pressure drop below the 15 psi minimum from the calculation. Also, the inspectors questioned whether this minimum pressure was a hard value for catastrophic failure or just the beginning of engine wear. The licensee is developing a response to the inspectors questions and expected to be resolved in the first quarter of 2025.
Planned Closure Actions: This issue is planned to be resolved in the first quarter of 2025 when the licensee presents an analysis of the EDG lube oil pressure during a strainer changeout.
Licensee Actions: The licensee will provide the inspectors with an analysis for lube oil pressures during strainer changeouts to demonstrate if the emergency diesel engine can remain operable.
Minor Performance Deficiency 71152A Minor Violation for Component with Incorrect Trip Settings Installed in DC Protection System Minor Performance Deficiency: Following discharge of the DC Bus 111 battery, as part of planned capacity testing, breaker 1DC05E-AF1 tripped. Following removal of the failed component, two issues were identified. 1) the breaker rating was incorrect and 2) the trip setting on the installed trip unit was set incorrectly. Specifically, design drawing 20E-1-4010G, Tabulation of Trip Settings 125V DC Dist. Center Bus 111 a& 112 (1DC05E & 1DC06E)250V DC Non-Safety-Related, called for a 600 amp breaker and the installed breaker was rated for 400 amps. The trip unit was set to High (5000A) vs. the expected setting of Low (1500A) as documented in design drawing 20E-1-4010G.
In response to this discovery, the licensee initiated Engineering Change 641912, Evaluation for Breaker Frame Used on 125VDC Distributions, to assess the potential impacts of these differences. This evaluation concluded that Braidwood is not designed or evaluated to allow the 125VDC batteries to completely discharge under normal operation. Normal and accident loads were within the rating of the installed breaker, i.e., less than 400 amps. Additionally, reviews showed that only loads associated with recovery from battery capacity testing would be expected to exceed the rating of the installed breaker. Based on this information, the licensee concluded that the breaker could perform its design function under normal operating and analyzed accident conditions.
Engineering Change 641912 also evaluated the impact of the higher trip set point. The breaker in question is downstream of a battery charger and this charger has a control circuit to limit charger output. The licensee evaluated the thermal heating to conductors assuming this control circuit did not function correctly with the actual higher trip setpoint. They concluded that conductors would not be damaged even when the control circuit fails to function correctly and the trip setpoint is set to high.
Inspectors concluded that decades of successful battery capacity testing provided a reasonable basis to conclude that the breaker would not have opened early as normal and analyzed accident loads are smaller than those experienced during battery capacity testing.
As the trip set point was set high and damage to conductors was determined not to be an issue, the inspectors accepted the licensees conclusion that the component would perform its design function.
The inspectors determined that the design drawings contained sufficient information for the licensee to have identified these issues during installation of the component and that these discrepancies were a performance deficiency. This component appears to have been installed during original construction as a review of the corrective action program documents and maintenance records did not identify previous issues with performance, replacement, or adjustment of this specific breaker.
Screening: The inspectors determined that the performance deficiency was minor as it was similar to IMC 0612, Appendix E, Examples of Minor Issues, example 3.a. Specifically, neither the incorrect breaker rating nor the incorrect trip setting adversely affected the mitigating systems cornerstone objective to ensure the availability, reliability, and capacity of systems that respond to initiating events to prevent undesirable consequences. Additionally, the installation of this component did not result in inoperability of DC Bus 111. The licensee entered this issue into the corrective action program as AR 4766946.
Observation: Review of Issues Involving Hose Clamps on the Auxiliary Feedwater Turbo Outlet Piping 71152A The inspectors reviewed the corrective actions involving hose clamps on the outlet of the 1B auxiliary feedwater turbo being misaligned on December 18, 2024, given a similar instance occurring on the 2B auxiliary feedwater diesel four months prior on August 12, 2024.
The inspectors reviewed the initial 2B AF misalignment, including the CAPE and extent of condition associated with the event. At the time of the event, there was no indication of an issue with the clamps the Unit 1B AF diesel engine. The inspectors ensured the misalignment did not represent an issue with operability of the diesel engines and the corrective actions from the December 18 misalignment. No issues were identified by the inspectors challenging operability or corrective actions from the previous instance in August.
Observation: Semiannual Trend Review of Unidentified Leakage for Units 1 and 2 71152S The inspectors reviewed the licensees response and identification of variances in the unidentified leakage rate for both units over the course of the calendar year. The inspectors reviewed corrective action documents, operator logs, and work orders, among other items, to assess if the licensee was promptly identifying, trending, and attempting to correct issues with unidentified leakage. Both units had a refueling outage in the calendar year, and increases in the baseline unidentified leakage rate occurred for both units after their respective refueling outages. The inspectors concluded the licensee was promptly identifying variances in the unidentified leakage rate, entering the issues into their corrective action program, and performing troubleshooting and investigations into causes for the fluctuating numbers. The inspectors also noted that overall unidentified leakage is higher than in past cycles and swings in the calculated value for leakage has more variance than in those cycles as well. However, the inspectors concluded the licensee is appropriately tracking and trending the data.
EXIT MEETINGS AND DEBRIEFS
The inspectors verified no proprietary information was retained or documented in this report.
- On January 14, 2025, the inspectors presented the integrated inspection results to D. Hudak, Plant Manager, and other members of the licensee staff.
- On October 10, 2024, the inspectors presented the radiation protection inspection results to N. Ramage, Senior Manager Site Radiation Protection, and other members of the licensee staff.
- On October 16, 2024, the inspectors presented the ISI inspection results to A. Schuerman, Site Vice President, and other members of the licensee staff.
- On December 16, 2024, the inspectors presented the emergency action level and emergency plan changes inspection results to A. Nissen, Emergency Preparedness Manager, and other members of the licensee staff.
- On January 14, 2025, the inspectors presented the Exit Meeting inspection results to D. Hudak, Plant Manager, and other members of the licensee staff.
DOCUMENTS REVIEWED
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Miscellaneous
Letter, Adam
Schuerman, Site
Vice President,
Braidwood
Generating
Station, to John
Keenan, Senior
Vice President
Midwest
Operations
Constellation
25 Winter Readiness Certification
11/15/2024
M-63, Sheet 1A
Diagram of Fuel Pool Cooling and Clean-up Units 1 and 2
BA
M-63, Sheet 1B
Diagram of Fuel Pool Cooling and Clean-up
BI
Drawings
M-63, Sheet 1C
Diagram of Fuel Pool Cooling and Clean-up
BD
BwOP AF-E1
Electrical Lineup - Unit 1 Operating
BwOP AF-M1
Operating Mechanical Lineup Unit 1
BwOP DG-E1
Electrical Lineup - Unit 1
BwOP DG-M1
Operating Mechanical Lineup Unit 1
BwOP FC-E2
Electrical Lineup - Unit 2
BwOP FC-M1
Operating Mechanical Lineup Unit 1
BwOP FC-M2
Operating Mechanical Lineup Unit 2
BwOP RH-E2
Electrical Lineup - Unit 2 Operating
BwOP RH-M3
Operating Mechanical Lineup Unit 2 2A RH Train
BwOP RH-M4
Operating Mechanical Lineup Unit 2 2B RH Train
Procedures
BwOP SI-M2
Operating Mechanical Lineup Unit 2
160
FZ 11.6-2; AB 426' Division 22, Electrical Penetrations Area
FZ 5.6-2; Auxiliary Building 451' Elevation Division 21
Miscellaneous Electrical Equipment and Battery Room
FZ 8.5-2; TB 426' Unit 2, Turbine Building Mezzanine
Floor (NE)
Fire Plans
FZ 8.5-2; TB 426' Unit 2, Turbine Building Mezzanine
Floor (NW)
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
FZ 9.2-2 and 9.3-2; DG 401' Diesel Generator Room 2A and
Day Tank Room
24-036
Fire System Impairment Permit
08/21/2024
Miscellaneous24-050
Fire System Impairment Permit
09/24/2024
Scaffold Installation, Inspection, and Removal
Procedures
Fire Protection Impairment Control
Drawings
Auxiliary Building Upper Basement Floor Plan ~EL.383'-0"
Area 4
185677
2RF010 Reactor Cavity Sump Flow Indication
11/10/2003
4454677
04-OSP-R A2R22LL AP to Address Unit 2 RX Head
Residues
10/21/2021
4673688
OSP-A 2D RCFC Head Ribs Sealing Surface Defects
04/28/2023
4674445
OSP-A A2R23 ISI-Relevant Condition Identified on
2CV06009C
05/01/2023
4675667
OSP-A 2RY03MA Boric Acid Leak and Potential Bolting
Wastage
05/04/2023
4692930
Steam Generator Program Health Report - Yellow
Cornerstone
07/27/2023
4731208
01/16/2024
4742589
2B CV Inboard Seal Leakage
2/04/2024
4763512
1A Steam Generator Anion (Chloride/Sulfate): Action Limit 2
04/04/2024
4773737
AL2 on the Steam Generator Blow Down Rough Chiller
05/13/2024
4806584
Byron EOC: N-722-1 Augmented ISI Program
10/03/2024
4807820
OSP-? ISI - Relevant Condition on 2AF07036R Pipe Support
10/08/2024
Corrective Action
Documents
4807823
OSP-? ISI - Relevant Condition on 2AF04032V Pipe Support
10/08/2024
Drawings
Machined RCFC Head
C
457846
Evaluate Minimum Thickness for 2VP01AD Heads
635377
2RC01R Upper Head Primer Coating Delamination Resulting
in Spotting on Surface
10/25/2021
638969
Minor Revision 001G to Calc 061807 Address Relevant
Condition Identified for 2CV06009C
05/08/2023
Engineering
Changes
638985
Evaluation of 2CV06/2CV03 Supports Due to Relevant
Condition on Support 2CV06009C
05/08/2023
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Bare Metal Visual of 2RC01R Bottom Head BMI
04/29/2020
Bare Metal Visual of 2RC01R Bottom Head BMI
04/26/2023
PT Examination of 2-RHP-01-RHP-01,02,03
10/14/2024
Ultrasonic Examination of 2AF-06-06
10/08/2024
Ultrasonic Examination of 2FW-04-21
10/10/2024
Ultrasonic Examination of 2FW-04-22
10/10/2024
Ultrasonic Examination of 2RC-32-16
10/10/2024
Ultrasonic Examination of 2RC-32-17
10/10/2024
Ultrasonic Examination of 2RC-32-11
10/10/2024
VT-3 of 2AF07036R
10/09/2024
VT-3 of 2AF04032V
10/09/2024
NDE Reports
Bare Metal Visual Exam of RPV Upper Head Surface
10/15/2024
Constellation Nuclear Welding Program Repair of Welds and
Base Material
Liquid Penetrant (PT) Examination
VT-3 Visual Examination of Component Supports,
Attachments, and Interiors of Reactor Vessels
Ultrasonic Examination of Ferritic Piping Welds
Ultrasonic Examination of Austenitic Piping Welds
Boric Acid Corrosion Control (BACC) Program
Boric Acid Corrosion Control (BACC) Program Identification,
Screening, and Evaluation
Bare Metal Visual Examination for Nickel Alloy Materials
ER-BR-330-1001
Braidwood Generating Station in Service Inspection Program
Plan
PDI-UT-1
Generic Procedure for the Ultrasonic Examination of Ferritic
Pipe Welds
G
PDI-UT-2
Generic Procedure for the Ultrasonic Examination of
Austenitic Pipe Welds
J
Procedures
WPS 1-1-GTSM-
Welding Procedure Specification
Work Orders
1576384
Bare Metal Visual of 2RC01R Bottom Head BMI
04/28/2014
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
1865044
Bare Metal Visual of 2RC01R Bottom Head BMI
04/21/2017
5189536
CM 2VP01AD - 2D RCFC - Repair Refurbish Heads
04/29/2023
Miscellaneous
TQ-AA-150-F25
Braidwood Generating Station Licensed Operator
Requalification Annual Exam Status Report
09/27/2024
Miscellaneous
TM-241111-010
Braidwood Station Licensed Operator Requalification
Simulator Scenario Guide
10/28/2024
4714650
2DG01SB-B Not Working Properly
11/02/2023
20712
Dry Boric Acid Residue on 2AF01PB
11/30/2023
21485
2AF005B Indicates Dual When Full Open
2/04/2023
22111
2A DG Lube Oil Leak near Turbo LO Filters
2/07/2023
23414
1B DG read 620 rpm
2/13/2023
23575
Water Leaking from Top of Engine Of 2B AF PP
2/14/2023
24818
2B DG Jacket Water Leak Worse Again
2/20/2023
4731243
Adverse Trend - Diesel Fuel Injectors Parts Quality Issue
01/16/2024
4731476
1DG01KB-X1 Leaks at Flange
01/16/2024
4733115
1B DG Failed Cylinder Temperature Indications
01/18/2024
4750116
1B DG Showing 620 Rpm Locally at Full Speed
2/14/2024
4757027
Smoke Leaking Out of Running 2B AF Pump
03/11/2024
4760078
2B DG 4R Injector Pump Fuel Oil Leak
03/21/2024
4760588
3D Corrosion on Multiple Cells Of 2C PORV Battery
03/24/2024
4763428
Scoring on #2 Bearing 2AF01PB
04/03/2024
4763519
Refurbished Injector for 16V149 Aux Feed Diesel
04/04/2024
4764105
Corrosion on 2D SG PORV UPS Batteries
04/07/2024
4766997
OPS-A 1AF005F Will Not Go Closed
04/17/2024
4769029
1a Dg Starting Speed Slow
04/24/2024
4769660
OSP-A 1SX01FA Broken Sheer Key Collar and
Missing Spacer
04/26/2024
4773567
2D S/G PORV Battery Cell Specific Gravity Deviation High
05/12/2024
4774469
Intentional Abbreviated Maintenance
05/15/2024
4777028
2MS018A Failed to Close
05/29/2024
4777278
Vibes Trending Higher On 1A AF Pump
05/29/2024
4778907
2A DG Monthly Run - KVAR Oscillations
06/05/2024
Corrective Action
Documents
4786420
1SX2073A - Valve Internal Body Found Degraded
07/11/2024
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
4788664
07/23/2024
4793457
2B AF Pump Turbo Exhaust Disconnected
08/12/2024
4817845
1AF005F Handwheel Disengaged
11/15/2024
4818984
2B SX Strainer Not Rotating
11/21/2024
4818984
2B SX Strainer Not Rotating
11/21/2024
4819593
11/24/2024
4819646
2B SX Strainer Issues During PMT Run
11/25/2024
20817
2C S/G PORV Failed to Close with C/S
2/01/2024
24700
1B AF Engine NW Turbo Outlet Hose Clamp Misaligned
2/18/2024
24932
EOC for 2B SX Strainer CAPE - Inspect 1SX01FA
2/19/2024
24933
EOC for 2B SX Strainer CAPE - Inspect 1SX01FB
2/19/2024
24936
EOC for 2B SX Strainer CAPE - Inspect 2SX01FA
2/19/2024
CFR Part 21
Final Notification:
P21-12182023-
FN
Defect with Detroit Diesel/MTU Fuel Injectors
Engage Health
Report for Essential Service Water System
11/27/2024
Engage Health
Report for Emergency Diesel Generator System
2/09/2024
Engage Health
Report for Main Steam System
2/12/2024
Miscellaneous
Engage Health
Report for Auxiliary Feedwater System
11/18/2024
BwMP 3200-028
Diesel Generator Fuel Injection Performance Test
Warehouse Operations
Procedures
In-Storage Maintenance
5586815
2B SX Strainer Not Rotating
10/11/2024
Work Orders
5586815-1
2B SX strainer not rotating
10/11/2024
Corrective Action
Documents
4816999
Failed PMT for 2CV8385B 2B Seal Injection Filter Vent Valve
11/13/2024
Protected Equipment List - 1B PZR Heaters
December
24
RMAs and RICT for LCO 3.7.5 & 3.7.8
October
24
Miscellaneous
Protected Equipment List - 2B SX Strainer Repair
November
24
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Procedures
OP-BR-201-012-
1001
Braidwood On-Line Fire Risk Management
4807520
Evaluate 2BwOSR 3.3.2.9-1 Due to 0VA437Y Failure
10/07/2024
4810722
OSP-A Dry Boric Acid 2RY48AA for 2RC003A Valve Leakoff
Line
10/20/2024
Corrective Action
Documents
22139
Unexpected Annunciators 1-12-C5/D5
2/06/2024
108D685, Sheet
Safeguard Actuation S-G-DIG
4030AN053
Window Engraving Trip Status Lights and
Bypass - Permissive Lights
I
20E-2-4030EF36
Schematic Diagram Reactor Protection Safeguards
Actuation and Manual Reset - Train A
K
Drawings
20E-2-4030EF80
Schematic Diagram Reactor Protection Safeguards
Actuation and Manual Reset - Train B
L
2BwOSR 3.3.2.9-
Unit Two - Train A Safety Injection Manual Initiation and
Phase A Containment Isolation Manual Initiation Surveillance
Procedures
2BwOSR 3.3.2.9-
Unit Two - Train A Safety Injection Manual Initiation and
Phase A Containment Isolation Manual Initiation
Surveillance
638351
Feedwater Regulating Valve Dual Positioner Unit 2
Engineering
Changes
639486
2A Iso Phase Bus Duct Fan and Motor Replacement
4807493
OSP-X BYB Closed TSLB Lit with Breaker Open
10/07/2024
4809306
OSP-R Inactive Leakage at 2SI01B-24" Flush Connection
10/14/2024
Corrective Action
Documents
4811196
Failed Start of 2B AF Pump
10/22/2024
Procedures
2BwOSR 3.3.2.9-
Unit Two - Train A Safety Injection Manual Initiation and
Phase A Containment Isolation Manual Initiation
Surveillance
4467708
1AF004A Not Operating as Expected
2/20/2022
25939
00-OSP-X Dual Indication for 1AF005B
09/30/2022
4530154
A1R23: (IAM) 1AF005A Actuator
10/12/2022
4548184
2AF01PB-A Aux Oil Pump not Spinning with Motor
01/12/2023
4675507
Periodic Inspection of Limitorque Valve 2RH8701A
05/04/2023
Corrective Action
Documents
4676981
OSP-X2AF01PB Failed to Crank as Required during 2BWoS
05/10/2023
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
TRM 2.7.a.1
4695274
1AF001B Out of Tolerance
08/08/2023
4764055
Another SX Leak in Pipe Upstream of 1AF017A
04/06/2024
4768133
OSP-R 1RH8716A - Grade 3 Grease
04/21/2024
4780595
0B FP Diesel Fire Pump Level Gauge Not Moving
06/13/2024
4780831
Failed Portions of 0BwOS FP.3.3.E-12
06/14/2024
4783497
PM for 2RH618 Actuator Rebuild Will Go Late 06/30/3034
06/27/2024
4799780
MOV 1AF017A - Diagnostics UNSAT during Testing
09/06/2024
4799802
1AF017A MOV Diagnostics Trend Review
09/06/2024
4805348
1BwOSR 3.4.13.1 Action Level II Exceeded
09/29/2024
4806350
2AF005C Indicates Dual with Full Closed Signal
10/02/2024
4806371
OSP-A 2AF005F Indicates Duel with Full Closed Air Signal
10/02/2024
4806635
2MS017A - Valve Failed As-Found Testing
10/03/2024
4808605
OSP-X 2RH01SB Valve Containment Assembly Failed LLRT
10/11/2024
4808652
1BwOSR 3.4.13.1 Action Level II & Level III Exceeded
10/11/2024
4810515
10/19/2024
4815752
1CV8382A Leakby Identified
11/06/2024
Miscellaneous
A2R24 Reload
Video Recordings
A2R24 Reload Recording
10/16/2024
0BwOS
FP.2.2.M-2
Diesel Driven Fire Pump Surveillance
0BwOS FP.3.3.E-
0B Fire Pump NFPA Test
1BwOSR
3.4.13.1
Unit One Reactor Coolant System Water Inventory Balance
Surveillance
2BwOS ATWS-
R1
Anticipated Transient Without Scram Mitigation System
Refueling Outage End to End Surveillance
2BwOSR 3.7.5.7-
Unit Two Train A Auxiliary Feedwater Flow Path Operability
Non-Routine Surveillance (Following Cold Shutdown)
2BwOSR
5.5.8.AF-4A
Unit Two Comprehensive Inservice Testing (IST)
Requirements for 2A Auxiliary Feedwater Pump
Procedures
2BwOSR
5.5.8.AF-4B
Unit Two Comprehensive Inservice Testing (IST)
Requirements for 2B Auxiliary Feedwater Pump
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
2BwOSR
5.5.8.RH-6
Residual Heat Removal System Comprehensive Pump Test
and Check Valve Stroke Test
5179895
0B Fire Pump Annual NFPA Test
06/21/2024
21799
2RH8716B Lubricate Valve Stem
10/15/2024
21838
Perform PMT After Maintenance
10/20/2024
254633
Relay AF1AX2 at Panel 2AP05EQ
10/20/2024
5355850
PMT 2RH8701B Perform Functional Stroke
10/13/2024
5360923
Full Flow Test and Equipment Response of Auxiliary
Feedwater Pumps
10/02/2024
5361594
Anticipated Transient Without Scram Mitigation System
Refueling Outage Surveillance
10/07/2024
5362031
Physical Reactor Inventory Prior to Installing Reactor Head
10/16/2024
5364630
2MS013S/014S/015S/016S/017S-MSSV Operability Test
10/03/2024
5364630-13
2MS016A Testing of Main Steam Safety Valves
10/03/2024
5364630-17
2MS017A Testing of Main Steam Safety Valves
10/03/2024
5366484
IST-2RH01PB Comprehensive Flow Testing
10/15/2024
5383863
IST-U2 Train A AF Flowpath Operability Following Cold
Shutdown
10/20/2024
Work Orders
5383925
IST-2RH01PA Comprehensive Flow Testing
10/15/2024
Addendum 2
Braidwood Evacuation Time Estimates
Calculations
BRW Emergency Plan Revised for IPAWS Implementation
23-34
Constellation Radiological Emergency Plan Annex for
Braidwood Station
Procedures
Addendum 1
Braidwood Station On-Shift Staffing Technical Basis
ALARA Plans
Remove/Reinstall Rx Head Upper Internals ALARA Plan
Radiation Work
Permits (RWPs)
BW-02-24-0064
Remove/Reinstall Rx Head/Upper Internals
03/09/2023
Fire Brigade SCBA Missing SCBA Masks TB 426;
2/05/2023
Radwaste Ventilation (VW) is Not Functioning
03/19/2024
Corrective Action
Documents
Solid Radwaste Ventilation Not Functional
04/04/2024
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
FM ID SCBAs in the 426 cage not in a ready state
09/04/2024
Corrective Action
Documents
Resulting from
Inspection
NRC ID: Radiation Protection Record Question
10/08/2024
Intertek PSI
00465391
Quarterly Service Air and Self Contained Breathing
Apparatus - Performed 9.21.23
09/25/2023
Intertek PSI
00465790
Quarterly Service Air and Self Contained Breathing
Apparatus - Performed 7/10/24
07/11/2024
Annual Flow Testing of FireHawk SCBAs
09/26/2024
Trace Analytics
24-13005
MAKO Air Compressor Certificate of Analysis
04/19/2024
Miscellaneous
Trace Analytics
24-28473
MAKO Air Compressor Certificate of Analysis
09/04/2024
Monthly Inspection and Maintenance of MSA FireHawk Mask
Mounted Regulator SCBAs
Annual Respiratory Inspection and Certification Log
09/09/2024
September 2024 SCBA Battery Replacement and O-ring
Lubrication
09/26/2024
Attachments 4-5
July 2024 MSA SCBA / Firehawk Monthly Inspection
07/18/2024
Attachments 4-5
August 2024 MSA SCBA / Firehawk Monthly Inspection
09/03/2024
Procedures
RP-BR-832
Charging of Air Cylinders for Self-Contained Breathing
Apparatus Using MAKO BAM07H Compressor
Self-Assessments AR 04540872
Respiratory Protection Self-Assessment
10/20/2023
01/03/2023
RP-AA-220 Attachment 2, 2022 Intake Investigation Forms
for Braidwood Station Rad Workers
01/03/2023
Calculations
2/27/2023
RP-AA-220 Attachment 2, 2023 Intake Investigation Forms
for Braidwood Station Rad Workers - Dated 12/27/2023
2/27/2023
Corrective Action
Rad Worker Cannot Clear PM
10/15/2022
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Dosimeters and DLRs Were Not Replaced Before Expiration
Date
04/04/2023
Worker Alarmed PCM & Required WBC
05/01/2023
Documents
Worker Issued Wrong DLR
10/08/2024
Corrective Action
Documents
Resulting from
Inspection
NRC ID: Comment Regarding Attachment 2 of RP-AA-220
10/09/2024
24 NVLAP
Certificate of
Accreditation
Certificate of Accreditation to ISO/IEC 17025:2017
01/01/2024
24 NVLAP
Scope of
Accreditation
Scope of Accreditation to ISO/IEC 17025:2017
01/01/2024
DAW Ave
Average of 2018 - 2023 Dry Active Waste Sample Report
03/16/2023
BRW-24-001
24 Bioassay Program Annual Review at Braidwood
Nuclear Power Station
03/28/2024
BRW-24-002
24 Shallow Dose Equivalent Annual Review at Braidwood
Generating Station
04/01/2024
Miscellaneous
Attachments 2-5
Declared Pregnant Worker Records
Sample Personnel Exposure Investigation
Various
Dosimetry Issue, Usage, and Control
Multiple Dosimetry Issue Log (Single Entry)
Various
Methods for Estimating Internal Exposure from In Vivo and
In Vitro Bioassay Data
Procedures
Prenatal Radiation Exposure
Self-Assessments PI-AA-126-1001-
F-01
22 Dosimetry Self-Assessment
2/16/2022
Monthly Data Elements for NRC ROP Indicator - Reactor
Coolant System (RCS) Specific Activity
Various
71151
Calculations
Monthly Data Elements for NRC ROP Indicator -
Various
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
RETS/ODCM Radiological Effluent Occurrences
Procedures
MONTHLY DATA ELEMENT FOR NRC ROP INDICATOR -
REACTOR COOLANT SYSTEM (RCS) LEAKAGE
Radiation
Surveys
RCA exit dose and dose rate records
Various
4530461
OSP-A 1MS001D Failed to Close on B Train Manual
Actuation
10/18/2022
4539225
Low Lube Oil and Turbo Oil Pressure During 1A DG Run
11/27/2022
4539982
1A DG Low Lube Oil and Turbo Oil Pressure After
Adjustment
11/30/2022
4766946
OSP-A 1DC05E-AF1 Tripped during Charger Capacity Test
04/16/2024
4767520
ECR needed to Evaluate 1DC05E-AF1 Bus Bar
04/18/2024
4788098
Need Maintenance Rule Expert Panel Review of 4766946
07/18/2024
4789778
Deviation form PCM Template not Documented
07/26/024
4793457
2B AF Pump Turbo Exhaust Disconnected
08/12/2024
Corrective Action
Documents
24700
1B AF Engine NW Turbo Outlet Hose Clamp Misaligned
2/18/2024
Drawings
25V DC ESF Distribution Center Bus 111 (1DC05E) Part-1
L
Engineering
Evaluations
Evaluation for Breaker Frame used on 125 VDC Distributions
BwOP DG-8
Swapping Parallel Path Filters or Strainers
5E3
Preventive Maintenance Program
Procedures
Preventive Maintenance Database Revision Requirements
Corrective Action
Documents
25260
U2 RCS Leakrate Exceeds Deviation Action Level III
2/20/2024