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 Issue dateTitleTopic
IR 05000275/20230049 February 2024Integrated Inspection Report 05000275/2023004 and 05000323/2023004
IR 05000275/202301112 January 2024NRC License Renewal Phase 1 Inspection Report 05000275/2023011Loop seal
Weld Overlay
Nondestructive Examination
Incorporated by reference
Aging Management
Significance Determination Process
Pressure and Temperature Limits Report
Moisture barrier
License Renewal
Subsequent License Renewal
IR 05000275/202300313 November 2023Integrated Inspection Report 05000275/2023003 and 05000323/2023003Ultimate heat sink
Enforcement Discretion
Probabilistic Risk Assessment
Temporary Modification
Functionality Assessment
Significance Determination Process
Operability Determination
Offsite Circuit
Fire Protection Program
Siren
IR 05000275/202401510 October 2023Information Request for the Cybersecurity Baseline Inspection, Notification to Perform Inspection (050002752024015 and 050003232024015)Cyber Security
IR 05000275/202430124 August 2023Notification of NRC Initial Operator Licensing Examination 05000275/2024301; 05000323/2024301
IR 05000275/202300522 August 2023Updated Inspection Plan for Diablo Canyon Power Plant, Units 1 and 2 (Report 05000275/2023005 and 05000323/2023005) - Mid Cycle LetterFitness for Duty
Cyber Security
License Renewal
IR 05000275/202300214 August 2023Quarterly Integrated Inspection Report 05000275/2023002 and 05000323/2023002- August 7, 2023Boric Acid
Time of Discovery
Internal Flooding
Enforcement Discretion
Probabilistic Risk Assessment
Functionality Assessment
Significance Determination Process
Operability Determination
Pressure Boundary Leakage
Through-Wall Leak
Through-Wall Leakage
Fire Protection Program
IR 05000275/20213019 August 2023Errata for Diablo Canyon Power Plant, Units 1 and 2 - NRC Examination Report 050002752021301 and 050003232021301
IR 05000275/20234023 August 2023NRC Security Inspection Report 05000275/2023402, and 05000323/2023402Fitness for Duty
IR 05000275/202330125 July 2023NRC Initial Operator Licensing Examination Approval 05000275/2023301, 05000323/2023301
IR 05000275/202301011 May 2023NRC Inspection Report 05000275 2023010 and 05000323 2023010Commercial Grade Dedication
IR 05000275/20230019 May 2023Integrated Inspection Report 05000275/2023001 and 05000323/2023001High winds
Internal Flooding
Enforcement Discretion
Functionality Assessment
FLEX
Operability Determination
Earthquake
Fire Protection Program
Power change
Downpower
IR 05000275/202340310 March 2023NRC Security Baseline Inspection Report 05000275/2023403, 05000323/2023403 (Full Report)Fitness for Duty
IR 05000275/20220061 March 2023Annual Assessment Letter for Diablo Canyon Power Plant, Units 1 and 2 (Report 05000275/2022006 and 05000323/2022006)Fitness for Duty
Commercial Grade Dedication
Cyber Security
License Renewal
Exemption Request
COVID-19
IR 05000275/20220042 February 2023Integrated Inspection Report 05000275/2022004 and 05000323/2022004Safe Shutdown
Boric Acid
Packing leak
Stroke time
Commercial Grade Dedication
Weld Overlay
Internal Flooding
Probabilistic Risk Assessment
Nondestructive Examination
Temporary Modification
VT-2
Functionality Assessment
Significance Determination Process
Large early release frequency
Operability Determination
Earthquake
Liquid penetrant
Through Wall Leak
Fire Protection Program
Very Early Warning Fire Detection
IR 05000275/202201027 January 2023Biennial Problem Identification and Resolution Inspection Report 05000275/2022010 and 05000323/2022010Fitness for Duty
Probabilistic Risk Assessment
Condition Adverse to Quality
Significance Determination Process
Operability Determination
Maintenance Rule Program
Pressure Boundary Leakage
Operability Assessment
IR 05000275/202240226 October 2022Security Baseline Inspection Report 05000275/2022402 and 05000323/ 2022402Preemption Authority
IR 05000275/202200324 October 2022Integrated Inspection Report 05000275/2022003 and 05000323/2022003 and Exercise of Enforcement DiscretionEnforcement Discretion
Functionality Assessment
FLEX
Operability Determination
Severe Accident Management Guideline
Fatigue Rule
Fire Protection Program
IR 05000275/202200523 August 2022Updated Inspection Plan for Diablo Canyon Power Plant, Units 1 and 2 (Report 05000275/2022005 and 05000323/2022005)Fitness for Duty
Commercial Grade Dedication
Cyber Security
Exemption Request
Coronavirus
IR 05000275/202200210 August 2022Integrated Inspection Report 05000275/2022002 and 05000323/2022002Boric Acid
High winds
High Radiation Area
Internal Flooding
Probabilistic Risk Assessment
Coatings
Nondestructive Examination
Temporary Modification
VT-2
Emergency Lighting
Functionality Assessment
Significance Determination Process
Operability Determination
Fire Protection Program
Power change
Downpower
IR 05000275/20220119 August 2022Design Basis Assurance Inspection (Teams) Inspection Report 05000275/2022011 and 05000323/2022011Safe Shutdown
Anticipated operational occurrence
Probabilistic Risk Assessment
Anchor Darling
Significance Determination Process
Large early release frequency
Weak link
IR 05000275/20224013 August 2022NRC Security Inspection Report 05000275/2022401, 05000323/2022401Safeguards Contingency Plan
ML22143A88126 May 2022Revised Integrated Inspection Report 05000275/2022001 and 05000323/2022001Boric Acid
Internal Flooding
Enforcement Discretion
Temporary Modification
Functionality Assessment
Condition Adverse to Quality
Significance Determination Process
Coronavirus
COVID-19
Fire Protection Program
Power change
Downpower
ML22118A9365 May 2022Integrated Inspection Report 05000275/2022001 and 05000323/2022001Boric Acid
Internal Flooding
Enforcement Discretion
Temporary Modification
Functionality Assessment
Condition Adverse to Quality
Significance Determination Process
Coronavirus
COVID-19
Fire Protection Program
Power change
Downpower
IR 05000275/20220015 May 2022Integrated Inspection Report 05000275/2022001 and 05000323/2022001Boric Acid
Internal Flooding
Enforcement Discretion
Temporary Modification
Functionality Assessment
Condition Adverse to Quality
Significance Determination Process
Operability Determination
Coronavirus
COVID-19
Through Wall Leak
Fire Protection Program
Power change
Downpower
IR 05000323/202142031 March 2022Security Inspection Report 05000275 and 05000323/2021420
IR 05000275/20210062 March 2022Annual Assessment Letter for Diablo Canyon Power Plant, Units 1 and 2 (Report 05000275/2021006 and 05000323/2021006)Fitness for Duty
Exemption Request
Coronavirus
IR 05000275/20210043 February 2022Integrated Inspection Report 05000275/2021004 and 05000323/2021004High winds
Fire Barrier
Enforcement Discretion
Temporary Modification
Functionality Assessment
Operability Determination
Fire Protection Program
IR 05000275/202140413 January 2022Public - Security Baseline Inspection Report 05000275/2021404 and 05000323/2021404Affidavit
IR 05000275/20210033 November 2021Integrated Inspection Report 05000275/2021003 and 05000323/2021003Fire Barrier
Internal Flooding
Met Tower
Temporary Modification
Functionality Assessment
FLEX
Annual Radioactive Effluent Release Report
Operability Determination
Open Phase Initiative
Earthquake
Power-Operated Valves
Coronavirus
COVID-19
Fuel cladding
Fire Protection Program
IR 05000275/202101110 September 2021Design Basis Assurance Inspection (Programs) Report 05000275/2021011 and 05000323/2021011Anchor Darling
Power-Operated Valves
Coronavirus
COVID-19
Weak link
IR 05000275/20214055 August 2021Security Baseline Inspection Report 05000275/2021405 and 05000323/2021405Contraband
Coronavirus
COVID-19
IR 07200026/20214013 August 2021Diablo Canon Nuclear Power Plant, Security Baseline Inspection Report 07200026/2021401Safeguards Contingency Plan
IR 05000275/20210022 August 2021Integrated Inspection Report 05000275/2021002 and 05000323/2021002Packing leak
Functionality Assessment
Foreign Material Exclusion
Operability Determination
Coronavirus
COVID-19
Fire Protection Program
IR 05000275/202101228 July 2021Temporary Instruction 2515/194 Report 05000275/2021012 and 05000323/2021012Probabilistic Risk Assessment
Operator Manual Action
Open Phase Condition
Open Phase Initiative
Coronavirus
IR 05000275/20214011 July 2021Security Baseline Inspection Report 05000275/2021401 and 05000323/2021401Fitness for Duty
IR 05000275/20210017 May 2021DC IR 2021-001-drk, Diablo Canyon Power Plant Units 1 & 2 - Integrated Inspection Report 05000275/2021001, 05000323/2021001, & Independent Spent Fuel Storage Installation Inspection Report 07200026/2021001Boric Acid
High winds
Shutdown Margin
High Radiation Area
Stroke time
Internal Flooding
Nondestructive Examination
Temporary Modification
Functionality Assessment
Locked High Radiation Area
Operability Determination
Coronavirus
COVID-19
Fire Protection Program
DM weld
Power change
DCL-21-036, One Hundred Eighty Day Steam Generator Report for Diablo Canyon Power Plant Unit 1 Twenty-Second Refueling Outage22 April 2021One Hundred Eighty Day Steam Generator Report for Diablo Canyon Power Plant Unit 1 Twenty-Second Refueling OutageNondestructive Examination
ML21102A07012 April 2021Notification of NRC Design Bases Assurance Inspection (Programs) (05000275/2021011 and 05000323/2021011) and Initial Request for InformationStroke time
Power-Operated Valves
IR 05000275/202140331 March 2021Cyber Security Inspection Report 05000275/2021403 and 05000323/2021403Cyber Security
Affidavit
IR 05000275/202101011 March 2021Triennial Fire Protection Inspection Report 05000275/2021010 and 05000323/2021010Safe Shutdown
Fire Barrier
Fire impairment
Significance Determination Process
Coronavirus
COVID-19
Continuous fire watch
Fire Protection Program
IR 05000275/20200063 March 2021DC 2020 Annual Assessment Letter for Diablo Canyon Power Plant, Units 1 & 2 (Report 05000275/2020006 & 05000323/2020006)Fitness for Duty
Operator Manual Action
Cyber Security
Open Phase Condition
Exemption Request
Power-Operated Valves
COVID-19
IR 05000275/202000426 January 2021Integrated Inspection Report 05000275/2020004 and 05000323/2020004Boric Acid
High Radiation Area
Enforcement Discretion
Nondestructive Examination
Temporary Modification
Functionality Assessment
Significance Determination Process
Operability Determination
Coronavirus
COVID-19
Biofouling
Fire Protection Program
IR 05000275/202041122 December 2020Security Baseline Inspection Report 05000275/2020411 and 05000323/2020411Safeguards Contingency Plan
IR 05000275/202041015 December 2020NRC Security Inspection Report 05000275/2020410 and 05000323/2020410Safeguards Contingency Plan
IR 05000275/202001030 October 2020Biennial Problem Identification and Resolution Inspection Report 05000275/2020010 and 05000323/2020010Condition Adverse to Quality
Operability Determination
Pandemic
Coronavirus
COVID-19
IR 05000275/202000329 October 2020Integrated Inspection Report 05000275/2020003 and 05000323/2020003Boric Acid
Fire Barrier
Enforcement Discretion
Functionality Assessment
FLEX
Significance Determination Process
Process Control Program
Operability Determination
Earthquake
Coronavirus
COVID-19
Through-Wall Leak
Fire Protection Program
Scaffolding
IR 05000275/20200051 September 2020Updated Inspection Plan for Diablo Canyon Power Plant, Units 1 and 2 (Report 05000275/2020005 and 05000323/2020005)Fitness for Duty
Operator Manual Action
Cyber Security
Open Phase Condition
Exemption Request
COVID-19
IR 05000275/202000222 July 2020Integrated Inspection Report 05000275/2020002 and 05000323/2020002Internal Flooding
Temporary Modification
Functionality Assessment
Operability Determination
Maintenance Rule Program
Coronavirus
COVID-19
Fire Protection Program
Scaffolding
Siren
IR 05000275/202000116 April 2020Integrated Inspection Report 05000275/2020001 and 05000323/2020001High winds
Shutdown Margin
Stroke time
Weld Overlay
Internal Flooding
Enforcement Discretion
Temporary Modification
Cyber Security
Functionality Assessment
Operability Determination
Coronavirus
COVID-19
Through Wall Leak
Fire Protection Program
Power change