[Global] Benchmark Questions: Core Barrel Lift & Baffle Bolt Inspection

[Garza, Alexander M]

During 1R22, Davis-Besse will be performing core barrel lift for ISI and baffle bolt inspection. We are benchmarking other site for any lessons learned from these two evolutions. Below are questions related to these two activities.

1.       Core barrel lift

  *   What is the sequence of moves for your plenum when the core barrel requires removal? Does it involve multiple lifts of the plenum in preparation for the core barrel move?
  *   How much dose was accumulated for the core barrel lift?
  *   What dose rates were observed during lift?
  *   Were cameras used for lift by reactor services?
  *   Who moves the core barrel at your site? In house or Vendor?
  *   Would you provide a copy of the core barrel move RWP?



2.       Baffle Bolt inspection

  *   What Vendor performed the baffle bolt inspection? How was their performance from a radiological perspective?
  *   How much dose was accumulated for baffle bolt inspections?
  *   What were the results of inspection? If repairs were required, how much dose was accumulated and time or was it schedule for a future outage?
  *   What were the dose rates and contamination levels on inspection equipment?

Site Contact:
Jim Lochotzki
Staff Nuclear Engineering Specialist
Radiation Protection Section
Davis-Besse Nuclear Power Station
Energy Harbor
419-321-7329
jalochotzki at energyharbor.com

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