IR 05000454/2023002
| ML23215A119 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 08/03/2023 |
| From: | Hironori Peterson NRC/RGN-III/DORS/RPB3 |
| To: | Rhoades D Constellation Energy Generation, Constellation Nuclear |
| References | |
| IR 2023002 | |
| Download: ML23215A119 (1) | |
Text
SUBJECT:
BYRON STATION - INTEGRATED INSPECTION REPORT 05000454/2023002 AND 05000455/2023002
Dear David Rhoades:
On June 30, 2023, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Byron Station. On July 12, 2023, the NRC inspectors discussed the results of this inspection with H. Welt, 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, Hironori Peterson, Chief Reactor Projects Branch 3 Division of Operating Reactor Safety Docket Nos. 05000454 and 05000455 License Nos. NPF-37 and NPF-66
Enclosure:
As stated
Inspection Report
Docket Numbers:
05000454 and 05000455
License Numbers:
Report Numbers:
05000454/2023002 and 05000455/2023002
Enterprise Identifier:
I-2023-002-0050
Licensee:
Constellation Energy Generation, LLC
Facility:
Byron Station
Location:
Byron, IL
Inspection Dates:
April 01, 2023 to June 30, 2023
Inspectors:
N. Bolling, Project Engineer
A. Demeter, Resident Inspector
R. Knutson, Illinois Emergency Management Agency
J. Masse, Project Engineer
J. Robbins, Senior Resident Inspector
M. Stafford, Senior Resident Inspector
Approved By:
Hironori Peterson, 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 Byron 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
Apart from minor reductions in power to support scheduled testing activities or small load changes requested by the transmission dispatcher, Unit 1 remained at or near full power for the entire inspection period.
Apart from minor reductions in power to support scheduled testing activities or small load changes requested by the transmission dispatcher, Unit 2 remained at or near full power for the entire 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 summer readiness/readiness of offsite and alternate alternating current (AC) power systems on May 30, 2023.
Impending Severe Weather Sample (IP Section 03.02) (1 Sample)
- (1) The inspectors reviewed and evaluated the station's readiness for seasonal extreme weather conditions prior to the onset of severe thunderstorms with high winds on April 4, 2023.
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) Unit 1 Essential Service Water (SX) system during the 1A Emergency Diesel Generator (EDG) work window, completed on April 25, 2023
- (2) Unit 1 Component Cooling system prior to 1A Residual Heat Removal (RH) pump suction work window, completed on May 2, 2023
- (3) Unit 1 RH, Safety Injection, and Containment Spray systems during the 1B EDG work window, completed on May 11, 2023
71111.05 - Fire Protection
Fire Area Walkdown and Inspection Sample (IP Section 03.01) (8 Samples)
The inspectors evaluated the implementation of the fire protection program by conducting a walkdown and performing a review to verify program compliance, equipment functionality, material condition, and operational readiness of the following fire areas:
- (1) Fire Zone 3.1-1, Auxiliary Building, 414 Elevation, Unit 1, Cable Tunnel during CO2 Outage, completed on April 18, 2023
- (2) Fire Zone 9.1-1, Auxiliary Building, 401 Elevation, Unit 1, Train B, Diesel Generator Room during CO2 Outage, completed on April 18, 2023
- (3) Fire Zone 5.2-1, Auxiliary Building, 426 Elevation, Unit 1, Division 11 Engineered Safety Feature Switch Gear Room, completed on May 30, 2023
- (4) Fire Zone 5.2-2, Auxiliary Building, 426 Elevation, Unit 2, Division 21, Engineered Safety Feature Switch Gear Room, completed on May 30, 2023
- (5) Fire Zone 11.6-1, Auxiliary Building, 426 Elevation, Unit 1, Division 12, Electrical Penetration Area, completed on May 30, 2023
- (6) Fire Zone 11.6-2, Auxiliary Building, 426 Elevation, Unit 2, Division 22, Electrical Penetration Area, completed on May 30, 2023
- (7) Fire Zones 11.4.0, 10.1-1, 10.2-1, and 11.4A-1, Unit 1 Auxiliary Building 1B Auxiliary Feedwater Pump Areas, 383 Elevation, prior to contingency work window on June 13, 2023
- (8) Annual external fire hydrant flushing following underground leakage being observed above ground, as documented in Issue Report (IR) 4864265 on June 14, 2023
Fire Brigade Drill Performance Sample (IP Section 03.02) (1 Sample)
The inspectors evaluated the performance and training of the on-site fire brigade during observation of the following drill activities:
- (1) Observation and evaluation of the station's fire brigade during an unannounced drill on May 2, 2023
71111.07A - Heat Exchanger/Sink Performance
Annual Review (IP Section 03.01) (1 Sample)
The inspectors evaluated readiness and performance of:
- (1) Heat Exchanger (1DG01KA-X1 and 1DG01KA-X2) associated with the 1A Diesel Generator
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 on-watch operations shift crew during down power operations to ~85% in support of the Turbine Throttle and Governor Valve Surveillance on May 27, 2023.
Licensed Operator Requalification Training/Examinations (IP Section 03.02) (1 Sample)
The inspectors observed and evaluated the following licensed operator training activity:
- (1) A complex casualty graded scenario involving a crew of licensed operators was observed in facility's simulator on April 26, 2023
71111.12 - Maintenance Effectiveness
Maintenance Effectiveness (IP Section 03.01) (2 Samples 1 Partial)
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 0A Motor Driven Fire Pump following the lifting of relief valve 0FP775A on June 13, 2023
- (2) Maintenance effectiveness review associated with the Unit 1 and Unit 2 Leading Edge Flow Monitor (LEFM) system issues following the computer inverter fire in December 2022 and B1R25 outage in March 2023 on June 9, 2023 (3)
(Partial)
Maintenance effectiveness review associated with the Unit 1 1B Diesel Driven Auxiliary Feedwater (AF) Pump following discovery of a hose being installed opposite of work instructions, as documented in IR 4685821 through June 30, 2023 Quality Control (IP Section 03.02) (1 Partial)
The inspectors evaluated the effectiveness of maintenance and quality control activities to ensure the following SSC remains capable of performing its intended function:
(1)
(Partial)
Maintenance effectiveness and performance history review of work orders containing quality control hold points during the Unit 1 B1R24 outage through June 30. 2023
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 emergent work associated with the Unit 1 Station Air Compressors (SACs) following high temperatures on the 1A SAC requiring a swap to the 1B SAC, as documented in IR 4676262, completed on May 19, 2023
- (2) Review and evaluation of the emergent work associated with the Unit 1 B EDG following two trips during post-maintenance testing after the May 2023 work window, completed on May 18, 2023
- (3) Review and evaluation of the emergent work associated with the 1B AF pump following the failure to start as documented in IR 4679424 on April 19th, 2023
- (4) Review and evaluation of the emergent work associated with the 1B feedwater pump emergency oil pump pressure issues, as documented in IR 4666183 on May 30, 2023
- (5) Review and evaluation of the emergent work associated with the contingency plans for the 1B AF pump fuel hose removal and solenoid replacement following a failure to start, as documented in IR 4683206 on June 19, 2023
- (6) Review and evaluation of planned work associated with the 1A EDG, as documented in WOs 4994867, 5147904, and 5297624 on April 25, 2023
71111.15 - Operability Determinations and Functionality Assessments
Operability Determination or Functionality Assessment (IP Section 03.01) (7 Samples)
The inspectors evaluated the licensee's justifications and actions associated with the following operability determinations and functionality assessments:
- (1) Evaluation of the operability of the Pressurizer Safety Relieve Valve 1RY8010C following failing its as-found pressure test, as documented in IR 4561573, completed on May 1, 2023
- (2) Evaluation of the operability of the Unit 1 Turbine Throttle Valve 3 following indication of oscillations, as documented in IR 4679301 on June 9, 2023
- (3) Evaluation of the operability of the 1B AF Diesel Pump following failure to start during a monthly surveillance, as documented in IR 4679424 on June 15, 2023
- (4) Evaluation of the operability of the 1A EDG following the discovery of the mechanical governor setting being high out of rounds, as documented in IR 4683654 on June 19, 2023
- (5) Evaluation of the operability of the 1B EDG following the discovery of material inside the Jacket Water Standpipe, Fuel Oil Head Tank, and Diesel Oil Storage Tank, as documented in multiple IRs on June 19, 2023
- (6) Evaluation of the operability of the 1B AF Diesel Pump following the discovery of improper fuel hose orientation, as documented in IR 4685821 on June 20, 2023
- (7) Evaluation of the operability of Emergency Core Cooling System recirculation flow following the discovery of a gas void near 1SI8811A, as documented in IR 4683143 on June 23, 2023
71111.18 - Plant Modifications
Temporary Modifications and/or Permanent Modifications (IP Section 03.01 and/or 03.02) (1 Sample)
The inspectors evaluated the following temporary or permanent modifications:
- (1) Permanent plant modification per Engineering Change (EC) 632665: Diesel Generator (DG) Kilovac Relay Replacement for Unit 1 and Unit 2 on June 21, 2023
71111.24 - Testing and Maintenance of Equipment Important to Risk
The inspectors reviewed and evaluated the following post-maintenance and surveillance testing activities to verify system operability and/or functionality:
Post-Maintenance Testing (PMT) (IP Section 03.01) (6 Samples)
- (1) Functional and operational testing of the 1D Reactor Containment Fan Cooler following breaker replacement as documented in WOs 5105641 and 5105642, completed on April 19, 2023
- (2) Functional and operational testing of the 1A DG testing following 1A DG work window, completed on May 1, 2023
- (3) Functional and operational testing of the 2A AF pump following work window, completed on May 4, 2023
- (4) Functional and operational testing of the 1B DG testing Following 1B DG work window, completed on May 15, 2023
- (5) Functional and operational testing of the Unit 1 Train A Safety Injection system following a work window during the week of May 22 on May 25, 2023
- (6) Functional and operational testing of the 1B AF DG following an emergent work window, as documented in IR 4683206 on June 20, 2023
Diverse and Flexible Coping Strategies (FLEX) Testing (IP Section 03.02) (1 Sample)
- (1) Flex equipment tests, including monthly, quarterly, and annual pump flow tests and equipment surveillances, as documented in various WOs on June 15, 2023.
71114.06 - Drill Evaluation
Drill/Training Evolution Observation (IP Section 03.02) (1 Sample)
The inspectors evaluated:
- (1) A Drill/Training Evolution on June 23,
OTHER ACTIVITIES - BASELINE
===71151 - Performance Indicator Verification The inspectors verified licensee performance indicators submittals listed below:
MS05: Safety System Functional Failures (SSFFs) Sample (IP Section 02.04)===
- (1) Unit 1 (April 1, 2022 - March 31, 2023)
- (2) Unit 2 (April 1, 2022 - March 31, 2023)
MS06: Emergency AC Power Systems (IP Section 02.05) (2 Samples)
- (1) Unit 1 (April 1, 2022 - March 31, 2023)
- (2) Unit 2 (April 1, 2022 - March 31, 2023)
MS07: High Pressure Injection Systems (IP Section 02.06) (2 Samples)
- (1) Unit 1 (April 1, 2022 - March 31, 2023)
- (2) Unit 2 (April 1, 2022 - March 31, 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 issues:
- (1) Review and assessment of the station's corrective actions following the failure of a pressurizer safety relief valve during as-found testing, as documented in IR 4561573 on May 30, 2023
71152S - Semiannual Trend Problem Identification and Resolution Semiannual Trend Review (Section 03.02)
- (1) The inspectors reviewed the licensee's corrective action program for potential adverse trends associated with rework or early component failure that might be indicative of a more significant safety issue. A specific trend related to certain issues involving corrective action documents associated with potential rework or potentially early component failure is documented in the Results Section of this report.
INSPECTION RESULTS
Observation: Failure of Pressurizer Safety Relief Valve during As-Found Testing 71152A The inspectors performed a detailed review of IR 4561573, 1RY8010C Failed Set-Pressure Test but not IST Limits. The issue occurred when Unit 1 Pressurizer Safety Relief Valve (PSV) 1RY8010C was removed for set pressure verification per the Inservice Testing Program. The valve failed its as-found pressure lift test at the vendor. The PSV lifted at 2408 psig, or 2.1% lower than its nameplate set pressure. Technical Specification (TS) 3.4.10 allows a limit of +/- 2% of the nameplate set pressure (2411-2509) while the ASME Inservice Testing (IST) limit is +/- 3% of the nameplate set pressure (2387-2533). The inspectors chose this issue for an in-depth review of the licensees actions within their corrective action program (CAP) due to previous history of PSVs failing both the TS and IST limits.
Consequently, for this detailed Problem Identification and Resolution inspection sample, the inspectors focused on assessment of the licensees corrective actions taken both in the past and for this present condition.
The inspectors did not identify any issues with the licensees CAP actions taken for past historical issues involving PSVs failing set pressure testing following removal during an outage. These CAP actions were largely focused on updating procedures to improve PSV setpoint stability during the recertification process. Setpoint drift was determined to be the cause of the failures, so the planned changes are structured to reduce the likelihood of large setpoint drift while installed. Similarly, the inspectors review of the licensees current corrective actions also did not result in the identification of any issues of note. The incident documented in IR 4561573 occurred prior to implementation of all corrective actions from previous similar instances. As such, the most recent CAP actions acknowledge this and reinforce the procedure enhancements put in place to reduce as-found test failures.
No findings or violations of NRC requirements were identified by the inspectors in the course of this review.
Observation: Trend in Corrective Action Documents Associated with Rework or Early Component Failure 71152S The inspectors performed a review of plant issues, particularly those entered into the licensees CAP over the past several months. During their review, the inspectors noted a trend involving CAP documents involving rework or early component failure. Specific CAP entries reviewed by the inspectors included, but were not limited to:
IR 4395881, Potential Trend Identified: IRIS Records
IR 4401475, Byron Rework Report for 2020
IR 4414832, 1CV121 RLI Backup Disarmed
IR 4437207, Potential Trend - Main Steam Line Radiation Monitor Spikes
IR 4466635, Trend IR Ovation RLI Failure 1CV121 Loop
IR 44778181, Byron 2021 Annual Rework Report
1B GC Pump Issues The inspectors noted that the licensee was placing an appropriate level of emphasis on issues associated with rework.
The inspectors did not identify any findings or violations of NRC requirements in the course of their review.
EXIT MEETINGS AND DEBRIEFS
The inspectors verified no proprietary information was retained or documented in this report.
On July 12, 2023, the inspectors presented the integrated inspection results to H. Welt, Site Vice President, and other members of the licensee staff.
DOCUMENTS REVIEWED
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Miscellaneous
Letter #2023
Letter from Mr. Harris Welt to Ms. Marri Marchionda-Palmer
On-Site Certification of 2023 Summer Readiness
05/12/2023
0BOA ENV-1
Adverse Weather Conditions Unit 0
27
BOP 199-XHT-1
Hot/Extreme Weather Operations
CC-BY-118
Site Implementation of Diverse and Flexible Coping Strategies
(FLEX) and Spent Fuel Pool Instrumentation Program
General Area Checks and Operator Field Rounds
OP-AA-108-107-
1001
Station Response to Grid Capacity Conditions
Adverse Condition Monitoring and Contingency Planning
OP-AA-108-111-
1001
Severe Weather and Natural Disaster Guidelines
Seasonal Readiness
Procedures
Emergent Issue Response
M-42 Sheet 1A
Diagram of Essential Service Water
01/21/1998
M-42 Sheet 1B
Diagram of Essential Service Water
01/22/1998
Drawings
M-42A
Composite Diagram of Essential Service Water
01/21/1998
BOP CC-E1A
Unit 1 Component Cooling System Train "A" Electrical Lineup
BOP CC-M1A
Unit 1 Train "A" Component Cooling System Valve Lineup
(Train "A" Safety Loop and Seal Water Heat Exchanger)
BOP CS-E1A
Unit 1 Containment Spray System Train "A" Electrical Lineup
BOP CS-M1A
Containment Spray System Train "A" Valve Lineup
BOP RH-E1A
Unit 1 Residual Heat Removal System Train "A" Electrical
Lineup
BOP RH-M1A
Train "A" Residual Heat Removal System Valve Lineup
BOP SI-E1A
Unit 1 Safety Injection System Train "A" Electrical Lineup
BOP SI-M1A
Train "A" Safety Injection System Valve Lineup
BOP SX-E1A
Unit 1 Essential Service Water Train "A" Electrical Lineup
BOP SX-E1B
Unit 1 Essential Service Water Train "B" Electrical Lineup
BOP SX-M1A
Unit 1 Train "A" Essential Service Water Valve Lineup
Procedures
BOP SX-M1B
Unit 1 Train "B" Essential Service Water Valve Lineup
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Work Orders
203199
PM Inspection, In-Service Diag Test, PIT
05/02/2023
1439094
Fireproofing in Diesel Generator Air Shafts
11/12/2012
Corrective Action
Documents
4684265
Underground Leak Near 0FP581
06/12/2023
FZ 10.1-1
Aux. Bldg. 383'-0" Elev. 1B Diesel Fuel Oil Storage Tank
Room
FZ 10.2-1
Aux. Bldg. 383'-0" Elev. 1A Diesel Fuel Oil Storage Tank
Room
FZ 11.4-0 North
Aux. Bldg. 383'-0" Elev. General Area - North
FZ 11.4-0 West
Aux. Bldg. 383'-0" Elev. General Area - West
FZ 11.4A-1
Aux. Bldg. 383'-0" Elev. Unit 1 1B Aux. Diesel Feedwater
Pump and Day Tank Room
Pre-Fire Plan 157
Fire Zone 11.6-1, Aux. Bldg. 426 Elev. Division 12, Elec.
Penetration Area
Pre-Fire Plan 158
Fire Zone 11.6-2, Aux. Bldg. 426 Elev. Division 22, Elec.
Penetration Area
Pre-Fire Plan 43
Fire Zone 5.2-1, Aux. Bldg. 426 Elev. Division 11 ESF
Switchgear Room
Fire Plans
Pre-Fire Plan 44
Fire Zone 5.2-2, Aux. Bldg. 426 Elev. Division 21 ESF
Switchgear
Procedures
0BMSR FP-5
Fire Hydrant Yard Loop Annual Flush
06/13/2023
4388900
Weld Build Up Required for 1A DG Jacket Water Coolers
2/08/2020
4389014
Tube Plugging for 1A DG Upper and Lower JW Cooler
2/09/2020
4389278
Two Tubes Unable to be Plugged in 1DG01KA-X2
2/09/2020
4393165
1A EDG Lower Jacket Water Cooler Refurbishment Required
2/08/2020
Corrective Action
Documents
4409886
1A EDG Lower Jacket Water Cooler Requires Refurbishment
03/18/2021
Miscellaneous
Diesel Generator
Heat Exchanger
Trending
Diesel Generator Heat Exchanger Trending
06/05/2023
Work Orders
4949491
LR-1A DG Upper and Lower Jacket Water Heat Exchanger
GL-89-13 Inspection
11/23/2020
2BOSR 3.g.4-1
Unit Two Turbine Throttle and Governor Valve Surveillance
Roles and Responsibilities of On-Shift Personnel
Procedures
Operator Fundamentals
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
OP-AA-101-113-
1006
4.0 Crew Critique Guidelines
Watch-Standing Practices
OP-AA-103-102-
1001
Strategies for Successful Transient Mitigation
Operation of Plant Equipment
Communications
OP-AA-107-F-01
Risk Screening/Mitigation Plan for TV/GV Surveillance
05/10/2023
Conduct of Simulator Training and Evaluation
013
Work Orders
21869
Turbine Throttle and Governor Valve Surveillance
05/27/2023
4464524
NRC Identified PI&R Concerns with 0FP775A MRule and
Testing
2/02/2021
4492979
04/14/2022
4537812
0FP775A Relief Lifted
11/18/2022
4544144
U2 Computer Inverter Fire
2/21/2022
4544350
4.0 Critique for response to Computer Inverter Fire
2/21/2022
4548020
Evaluate Eliminating/Upgrading Computer Inverters
01/12/2023
4551606
U2 LEFM Cabinet Display
01/31/2023
4554708
Unexpected Alarm U1 LEFM Trouble
2/15/2023
4556159
LL - Unit 2 Computer Inverter Restoration
2/21/2023
4564954
U-1 LEFM cabinet alarms
03/26/2023
4670896
Alarms on U-2 LEFM Cabinet
04/18/2023
4671489
Replace LEFM transducers unit 2, A loop Path 2
04/19/2023
4671491
replace LEFM transducers unit 2, D loop Path 8
04/19/2023
4672592
Replace LEFM transducers unit 2, C loop Path 5
04/24/2023
4673041
LEFM Trouble
04/26/2023
Corrective Action
Documents
4679175
U-1 Computer Room Temps Affecting Calorimetric Power
05/18/2023
338067
000
Engineering
Changes
B-91-003-0157-00
Parts Evaluation and Commercial Grade Dedication for Aux
Feedwater Diesel Governor Hoses and Fittings
09/27/1991
0BOSR 10.b.4-1
Motor Driven Fire Pump Surveillance
Procedures
BMP 3100-84
Fabrication of Aeroquip Hoses
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
BMP 3100-86
Auxillary Feedwater Flex Hose Replacements
000
Maintenance Rule Functions - Safety Significance
Classification
Maintenance Rule Process Map
Maintenance Rule Implementation Per NEI 18-10
Maintenance Rule 18-10 - Scoping
Maintenance Rule 18-10 - Failure Definition
Foreign Material Exclusion Program
5190395
Replace U-1 LEFM Meter 2 Path 6 Transducers
05/01/2023
230594
LEFM Measure Spool Wall Thickness
03/16/2023
237710
Diesel Driven AF Pump Insp Per BMP 3203-1
03/30/2023
238840
LEFM Cabinet Preventative Maintenance
05/10/2023
267273
Unexpected Alarm U1 LEFM Trouble
03/27/2023
Work Orders
5358918
Unexpected Alarm U1 LEFM Trouble
05/19/2023
4449854
1B FW Pump Oil Pressure Up Light
09/30/2021
4666002
1B FW Pump Oil System Not Set Up in B1R25
03/28/2023
4666183
1B TDFW Pump EOP Runs Continuously
03/24/2023
4669317
1A Station Air Compressor Elevated Bearing Oil Temperature
04/11/2023
4673536
Suggestion for External Turbine Building Air Compressor
04/27/2023
4676262
High Temperature 1A SAC
05/07/2023
4677644
1B DG 80# Regulator Needs Replaced
05/12/2023
4677696
Cam Cover Gaskets
05/12/2023
4677763
1B DG SX Flow Low Annunciator
05/12/2023
4677782
1B DG Trip
05/12/2023
4677985
1B DG Trip During Cooldown Cycle
05/13/2023
4678794
Pressure Reducing Valve Output Incorrect
05/12/2023
4678794
Pressure Reducing Valve Output Incorrect
05/12/2023
4678856
Relaxed Test Criteria Leads to Nuisance Trip
05/17/2023
4678856
Relaxed Test Criteria Leads to Nuisance Trip
05/17/2023
4678875
Check Valve Failed Testing
05/17/2023
4679424
1B AF Pump Failed to Start
05/19/2023
Corrective Action
Documents
4683206
Emergent Work Window for 1AF01PB-K-L1
06/07/2023
Engineering
639109
1B Feedwater Pump TCCP For EOP Oil Pressure Switch
05/25/2023
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Changes
Orifice Blockage
BB PRA-005.04
Byron and Braidwood Probabilistic Risk Analysis, Auxiliary
Feedwater System Notebook
Miscellaneous
BYR-59609
Failure Analysis of VALVE, SOLENOID, 1/4" NPT, 2 WAY
NORMALLY OPEN
06/08/2023
BMP 3203-2
Preventative Maintenance of Auxiliary Feedwater Pump Diesel
Engine
Critical Component Failure Clock
Equipment Classification
Mitigating System Performance Index Data Acquisition &
Reporting
OP-AA-101-113-
1004
Prompt Investigation of 1B Auxiliary Feedwater Pump Failure
to Start
05/24/2023
OP-BY-108-117-
1000
1: Protected Equipment Matrix
04/24/2023
Issue Identification and Screening Process
Procedures
On-Line Work Control Process
239037
Minor Overhaul (1A SAC)
05/16/2023
253538
1A SAC Vibe Probe Intermittent 1VE-SA101B
05/16/2023
295262
External/Internal Inspection/Thermography (1A SAC)
05/16/2023
5352448
1B TDFW Pump EOP Runs Continuously
05/25/2023
5365037
1B DG Perform Trip Header Air Testing
05/16/2023
Work Orders
5373526
Emergent Work Window for 1AF01PB-K-L1
06/19/2023
24530
Gas Void Detected in 1SI06BA-24" Near 1SI8811A
2/01/2010
289105
COMPUTER POINT BRW02V_DEHCZT-MS5005A-A
READING ERRATIC
11/10/2011
25463
2MS5005A INDICATION IS SPIKING
03/01/2019
4380943
Strange Substance in 1B DG Jacket Water Standpipe
Sightglass
10/30/2020
4447391
1RY8010B Failed As-Found Testing at Vendor
09/19/2021
4450108
1RY8010C Failed As-Found Testing at Vendor
10/01/2021
4511789
Gas Void Detected in 1SI06BA-24" Near 1SI8811A
07/19/2022
Corrective Action
Documents
4561573
1RY8010C Failed Set-Pressure Tet but not IST Limits
03/13/2023
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
4679301
U1 TV3 oscillating
05/19/2023
4680131
1B DOST Suspect Sample
05/22/2023
4683307
Sediment Found in Fuel Oil Sample of 1DO02TB
06/07/2023
4683654
1A D/G Governor Setting High
06/09/2023
4684662
1B EDG Jacket Water Level Sightglass Accumulation 1LD-
DG116B
06/14/2023
4684672
1B EDG Fuel Oil Head Tank Foreign Material
06/14/2023
M-152 Sheet 2C
2C DIAGRAM OF TURBINE E. H. FLUID SYSTEM MAIN
TURBINE
09/06/1995
M-35 Sheet 5B
DIAGRAM OF MAIN STEAM (TURBINE DRAINS)
08/06/1998
Drawings
M-50 Sheet 3
Diagram of Diesel Fuel Oil
08/07/1998
343598
LVDT CONNECTOR BACK SHELL GROMMET IS TOO
SMALL TO ACCEPT 3 PAIR WIRING
11/18/2004
378913
Past Operability Evaluation of Gas Void in Line 2SI34A-B
000
379408
Past Operability Evaluation of Gas Void at 1SI8811A
000
Engineering
Changes
398675
Emergency Diesel Generator Frequency and Voltage Variation
000
Miscellaneous
Corrective Action Program Evaluation Charter for the 1B AF
Diesel Driven Pump Failure to State
05/26/2023
Ultrasonic Fluid Solid/Sedimentation Data Sheet for 1BOSR
5.2.3
06/06/2023
1BOSR 5.2.3
Unit 1 Periodic Monitoring and Trending of Containment Spray
and Emergency Core Cooling Systems for Gas Accumulation
1BOSR DG-R1a
Unit One 1A Diesel Generator Overspeed Trip Surveillance -
Month
1BVSR 4.10.1-1
Unit 1 - Pressurizer Safety Vale 1RY8010A, 1RY8010B,
1RH8010C Test Verification
Procedures
BOP DG-11
Diesel Generator Startup
5157042
Replacement of the Fuel Shutoff Solenoid
03/23/2023
27895
Remove/Replace Safety Relief Valve
03/13/2023
Work Orders
5366968
U1 TV3 Oscillating
05/25/2023
Engineering
Changes
2665
DIESEL GENERATOR (DG) KILOVAC RELAY
REPLACEMENT WITH STRUTHERS-DUNN MODEL
(BRAIDWOOD UNITS 1 & 2)
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
637584
DIESEL GENERATOR (DG) KILOVAC RELAY
REPLACEMENT WITH STRUTHERS-DUNN MODEL
(BYRON UNITS 1 & 2)
Engineering
Evaluations
BRW-97-0215-S
Braidwood Seismic Evaluation of Diesel Generator Governor
Control Panel
297624
1PL07J Replace 1A DG Local Control Panel Kilovac Relays
04/28/2023
Work Orders
297627
1PL07J Replace 1B DG Local Control Panel Kilovac Relays
05/02/2023
4544639
B5B Building Sprinkler Head Broken
2/24/2022
4673631
Unable to Perform Portions of 1BOSR DG-11
04/28/2023
4677644
1B DG 80# Regulator Needs Replaced
05/12/2023
4679318
FLEX Satellite Equipment Maintenance Issues
05/19/2023
4679389
Flex Building Fire Hose Leaking at Coupling
05/19/2023
Corrective Action
Documents
4679767
High Head Flex Pump Design Deficiency
05/22/2023
0BOSR FP-14W
B.5.B Equipment Weekly Surveillance
0BOSR FX-14M
Flex Equipment Monthly Surveillance
0BOSR FX-14Q
Flex Equipment Quarterly Surveillance
0BOSR FX-M2
Unit 0 High Head Flex Pump Monthly Turnover Surveillance
0BOSR FX-S2
Unit 0 Flex Pump Operability Surveillance
1BOSR 0.5-
2.SI.1-1
Unit One 1SI8821A, 1SI8812A, 1SI8924, 1SI8807A/B, and
1SI8814 Exercise Test
1BOSR 0.5-
2.SI.3-1
Unit One 1SI8821A, 1SI8812A, 1SI8924, 1SI8807A/B, and
1SI8814 Position Indication Test
1BOSR 8.1.2-1
Unit One 1A Diesel Generator Operability Surveillance
1BOSR 8.1.2-2
Unit One 1B Diesel Generator Operability Surveillance
1BOSR DG-11
Unit One 1A Diesel Generator Lockout Surveillance
1BOSR DG-12
Unit One 1B Diesel Generator Lockout Surveillance
1BOSR DG-2
Unit One 1A Diesel Generator Relay Operability Verification
1BOSR DG-3
Unit One 1B Diesel Generator Relay Operation Verification
BAP 1100-10T5
B.5.B Building (B.5.B Hose Trailer) ETN# 0MVHL110M
Procedures
BOP SI-1
Safety Injection System Startup
1947536
Perform Thermal Overload Test 1AP21E-G1
05/23/2023
1947537
Perform Thermal Overload Test 1AP22E-A6
05/23/2023
Work Orders
4994867
Small Jacket Water Leak 1A DG
04/28/2023
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
5147904
1A DG Manually Secured due to Exhaust Leak
04/24/2023
5162408
1A Diesel Generator Relay Operation Verification
04/28/2023
5163384
1A D/G Load Rejection and Overspeed Trip Surv
04/28/2023
5163830
1A Diesel Generator Lockout Surveillance
04/28/2023
5169126
(Change/Sample) Safety Injection Pump 1A
05/24/2023
5170418
1SI8814 1A SI Miniflow Therm OL Surv (MCC 131X1A-N2)
05/23/2023
5170419
MOV Thermal Overload Surveillance (MCC 131X1-H4)
SI8821A SI
05/24/2023
5170420
1SI8807A Thermal OL Surv (MCC 131X1-G4)
05/23/2023
5177164
Replace All Normally De-Energized Agastate Relays NWR
05/12/2023
5180611
PM Inspection, In-Service Diag Test, PIT
05/24/2023
216774
1B D/G Load Rejection and Overspeed Trip Surv
05/12/2023
216776
1B Diesel Generator Relay Operation Verification
05/12/2023
217073
1B Diesel Generator Lockout Surveillance
05/12/2023
217502
1B Diesel Gen Operability - 24 Mth - Inspect & Engine Analys
05/12/2023
284262
1SI8814 1A SI Miniflow Replace Cub FU Blk (1 Pole FU)
05/23/2023
286324
Actuator Grease Replacement (MOVLL)/Inspection for Wear
05/24/2023
5313532
(NEIL)-1B Diesel Generator Operability Surveillance
05/12/2023
5318341
(NEIL)-1A Diesel Generator Operability Surveillance
04/28/2023
5319751
FLEX PUMP #1 OPERATING
06/08/2023
20334
Function Test and Inspection of the B Medium Head Flex
Pump
06/14/2023
20335
Function Test and Inspection of the C Medium Head Flex
Pump
06/14/2023
20336
Function Test and Inspection of the A Medium Head Flex
Pump
06/14/2023
5354549
Flex Equipment Quarterly (92D) Surveillance
06/15/2023
5357133
(NEIL)-LR-1A Diesel Generator Operability Surveillance
04/28/2023
5363310
FLEX EQUIPMENT MONTHLY (1M) SURVEILLANCE
06/12/2023
5365035
HIGH HEAD FLEX PUMP MONTHLY RUN
06/08/2023
5367675
B.5.B EQUIPMENT WEEKLY (7D) SURVEILLANCE
05/30/2023
4686036
2Q2023 Unannounced Call-In Augmentation Drill Results
06/20/2023
Corrective Action
Documents
4686300
Byron Station 2023 Environmental Monitoring Drills
06/20/2023
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
Drills and Exercise Program
Procedures
Drill and Exercise Evaluation
NRC Performance Indicator Data; Mitigating Systems
Mitigating System Performance Index for Emergency AC
Power
04/01/2022 -
03/31/2023
NRC Performance Indicator Data; Mitigating Systems
Mitigating Systems Performance Index for High Pressure
Injection
04/01/2022 -
03/31/2023
71151
Miscellaneous
NRC Performance Indicator Data; Mitigating Systems
Safety System Functional Failures
04/01/2022 -
03/31/2023
4338905
2RY8010A Pzr Safety Vlv Failed As-Found Test per TS 3.4.10
04/27/2020
4450104
1RY8010A Failed As-Found testing at Vendor
09/28/2021
4450108
1RY8010C Failed As-Found testing at Vendor
10/01/2021
Corrective Action
Documents
4455861
B1R24 LL - Programs Engineering
10/26/2021
NWS21-105
NWS Certification of Calibration for Pressurizer Safety Valve
Serial Number N56964-00-0089
08/26/2021
NWS 22-51
NWS Certification of Calibration for Pressurizer Safety Valve
Serial Number N56964-00-0090
04/07/2022
NWS 22-52
NWS Certification of Calibration for Pressurizer Safety Valve
Serial Number N56964-00-0094
04/07/2022
Miscellaneous
NWS 22-53
NWS Certification of Calibration for Pressurizer Safety Valve
Serial Number N56964-00-0030
04/07/2022
NWS-R-85
NWS Technologies Valve Repair Procedure for Constellation -
Byron/Braidwood Nuclear Station Crosby Pressurizer Safety
Valves
Procedures
NWS-T-29
NWS Safety Valve Test Procedure for Constellation - Byron
Nuclear Station Crosby Pressurizer Safety Valves
4395881
Potential Trend Identified: IRIS Records
01/07/2021
4401475
Byron Annual Rework Report for 2020
2/10/2021
4414832
1CV121 RLI Backup disarmed
04/07/2021
4437207
Potential Trend - Main Steam Line Radiation Monitor Spikes
07/27/2021
4438639
Swap Detector Elements between 1AR022J and 1AR023J
08/02/2021
4466635
Trend IR Ovation RLI Failure 1CV121 Loop
2/14/2021
Corrective Action
Documents
44778181
Byron 2021 Annual Rework Report
2/15/2022
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
4540515
Unexpected Alarm 2-19-C8, Generator Volt Reg Common
Alarm
2/02/2022
4665784
1B GC Pump Issues
03/29/2023