ML25135A057

2024 Annual Assessment Meeting - NRC Presentation Slides

ML25135A057
Person / Time
Site:	Diablo Canyon
Issue date:	05/15/2025
From:	Russ Bywater NRC Region 4
To:
References
Download: ML25135A057 (1)

Text

Diablo Canyon Annual Assessment Meeting 2024 Reactor Oversight Process Nuclear Regulatory Commission - Region 4 ADAMS Accession # ML25135A057

2 Our Mission The NRC protects public health and safety and advances the nations common defense and security by enabling the safe and secure use and deployment of civilian nuclear energy technologies and radioactive materials through efficient and reliable licensing, oversight, and regulation for the benefit of society and the environment.

NRC Strategic Plan Goals Safety and Security - Ensure the safe and secure use of radioactive materials Organizational Health - Continue to foster a healthy organization Stakeholder confidence - Inspire stakeholder confidence in the NRC

NRC Annual Assessment Summary PG&E operated the plant safely and in a manner that preserved the public health and safety and protected the environment.

Diablo Canyon Units 1 & 2 were in the Licensee Response Column of the NRCs ROP Action Matrix at the end of 2024.

Diablo Canyon

NRC Inspection Activities

~7500 hours of inspection and related activities 2 resident inspectors on site - residents make four quarterly inspection reports per year and walk through the plant every day 10 regional inspections 3 major team inspections License Renewal Aging Management Problem Identification and Resolution Diablo Canyon 2024

Diablo Canyon PIs and Findings January 1 through December 31, 2024 All 17 Performance Indicators for each unit (including Security) were Green 11 Green / Severity Level IV inspection findings

NRC Resident Inspection Findings Failure to maintain annunciator response procedure (IR 2024-001)

Inadequate maintenance rule evaluations on condenser steam dump system (IR 2024-001)

Failure to remove valve parts results in reactor trip at low power (IR 2024-001)

NRC Resident Inspection Findings Failure to consider appropriate performance criteria for maintenance rule components (IR 2024-001)

Failure to maintain original design specifications after maintenance (IR 2024-001)

Failure to make an interim Part 21 report (IR 2024-001)

NRC Resident Inspection Findings Failure to correctly determine operability of auxiliary building ventilation fan (IR 2024-002)

Failure to preclude repetition of the bearing failure of the auxiliary saltwater pump 2-2 (IR 2024-010)

Significance Threshold Green Baseline Inspection White Requires additional NRC oversight Yellow Requires more NRC oversight Red Requires most NRC oversight Performance Indicators Inspection Findings Green Very low safety or security significance finding White Low to moderate safety or security significance finding Yellow Substantial safety or security significance finding Red High safety or security significance finding

Industry-Wide Performance 0

10 20 30 40 50 60 70 80 90 85 9

0 0

0 As of 12/31/2024 0

Industry-Wide Inspection Findings Finding data current as of 02/19/2025 0

100 200 300 400 500 600 546 1

4 0

0 Calendar Year 2024 data

Industry-Wide Performance Indicators 0

1000 2000 3000 4000 5000 6000 7000 Green White Yellow Red 6319 6

0 0

Calendar Year 2024 data

NRC Plans for 2025 NRC plans baseline inspections at Diablo Canyon for the remainder of 2025. This includes:

Triennial Fire Protection Cyber Security

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https://service.govdelivery.com/accounts/USNRC/subscriber/new 15

Contacting the NRC Report an emergency

• (301) 816-5100 (call collect)

Report a safety concern

• (800) 695-7403

• Allegation@nrc.gov General information or questions

• www.nrc.gov