ML15273A429

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Revised Slides for September 29, 2015 Meeting with Dominion Re North Anna ISFSI License Renewal
ML15273A429
Person / Time
Site: North Anna  Dominion icon.png
Issue date: 09/29/2015
From: William Allen
Dominion, Virginia Electric & Power Co (VEPCO)
To:
Spent Fuel Licensing Branch
Allen W
References
Download: ML15273A429 (18)
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Agenda

  • Lead cask inspection scope
  • Inspection process/criteria
  • Schedule for inspections llilDh:.

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North Anna ISFSI License

  • Site-specific license includes only Pad 1 and the TN-32 casks
  • Submit application by June 2016 3

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Lead Cask Inspections

  • Guidance on lead cask inspections provided by:
  • Lead cask inspections supplemented by
  • Quarterly material condition surveillances
  • Post-seismic event inspections on five TN-32 casks

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Scope of Lead Cask Inspections

  • Lift a TN-32 cask and visually inspect bottom for coating adhesion and corrosion (i.e., loss of material)
  • Remove a protective cover and visually inspect the following components for corrosion:
  • Protective cover
  • Neutron shield and neutron shield bolts
  • Overpressure system components
  • Visible lid sealing surface including lid bolts
  • Visually inspect upper and lower trunnions for corrosion (loss of material)

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Lead Cask Inspections

  • Visual inspections will be conducted by certified NOE personnel (i.e., VT-1 or VT-3)
  • A mockup of the cask bottom was used to test inspection technique and ensure meeting NOE requirements
  • Indications of corrosion or lack of coating adhesion will be recorded and a Condition Report submitted for disposition
  • Cask handling will be conducted by qualified personnel 8

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Lead Cask Selection

  • Selection of lead cask based on degradation mechanism of concern (corrosion)
  • Circumstances unique to the North Anna ISFSI result in the selection of two different casks for the bottom and the protective cover inspections
  • August 2011 seismic event (5.8 magnitude earthquake centered near Mineral, VA)
  • Replacement of nine protective covers in 2002-2003 with new protective cover design

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Selection of Lead Cask Bottom Inspection

  • Factors contributing to selection of cask for bottom inspection:
  • Accessibility for lifting
  • Movement during seismic event
  • Decay heat of the fuel in the cask
  • Time since loading 10

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Selection of Lead Cask Bottom Inspection

  • Based on the selection factors, cask TN-32.49 was chosen for bottom inspection
  • One of four casks accessible with transporter
  • TN-32.45 accessible now, but TN-32 high burnup demonstration cask will block it for future bottom inspections
  • Moved the most of the accessible casks (3 inches) during seismic event
  • Decay heat 29 KW when loaded
  • Oldest of remaining accessible casks
  • Best candidate with accessibility, movement during seismic event, high initial heat load, earliest loading date

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Selection of Lead Cask Bottom Inspection Accessible with Movement During Decay Heat When Cask Transporter Seismic Event (In)

Loaded (KW)

Date Loaded TN-32.06 1.50 16.90 Jul 1998 TN-32.10 2.50 18.28 Aug 1998 TN-32.12 0.50 15.40 Jun 1999 TN-32.13 1.00 14.13 Jul 1999 TN-32.14 0.75 13.30 Dec 1999 TN-32.16 3.50 15.39 Jun 2000 TN-32.19 2.25 16.20 Aug 2000 TN-32.20 1.00 14.94 Sep 2000 TN-32.21 4.50 21.29 Jan 2001 TN-32.23 3.50 17.96 Jul2001 TN-32.24 3.00 22.15 Aug 2001 TN-32.26 1.25 15.95 Jan 2002 TN-32.29 2.00 13.62 Feb 2002 TN-32.30 c= 0.00 ~

13.92 Aug 2002 TN-32.32 1.50 13.84 Nov 2002 TN-32.36 4.00 28.53 Jul2003 TN-32.37 3.00 28.89 Aug 2003 TN-32.38 1.00 28.72 Sep 2003 TN-32.41 c= 0.00

=::::J 25.62 Dec 2003 TN-32.42 1.50 25.95 Feb 2004 TN-32.43 3.50 26.01 Mar 2004 TN-32.45 Yes 1.50 26.21 Jun 2004 TN-32.47 1.00 26.43 Apr2005 TN-32.48 2.00 30.10 Jun 2006 TN-32.49 Yes 3.00 28.94 Aug 2006 TN-32.52 Yes 2.00 30.66 Sep 2006 TN-32.53 Yes 2.50 20.70 Jan 2007 13

Selection of Lead Cask Protective Cover Inspection

  • Factors contributing to the selection of the cask for protective cover inspection
  • Time since cover installation
  • Movement during seismic event
  • Not inspected after seismic event
  • Based on these factors, cask TN-32.23 was chosen for protective cover inspection
  • Oldest installed protective cover
  • Cask moved 3.5 inches during seismic event
  • Not one of the five casks inspected after seismic event 14.

Selection of Lead Cask Protective Cover Inspection Movement Inspected Date Protective During Seismic Following Cask Date Loaded Cover Replaced Event (In)

Seismic Event Recoated in 2014 TN-32.06 Jul 1998 Mar 2002 1.50 Yes TN-32.10 Aug 1998 Mar 2002 2.50 TN-32.12 Jun 1999 Jun 2002 0.50 Yes TN-32.13 Jul 1999 May 2002 1.00 TN-32.14 Dec 1999 Jun 2003 0.75 Yes TN-32.16 Jun 2000 Jun 2003 3.50 TN-32.19 Aug 2000 Jun 2003 2.25 TN-32.20 Sep 2000 Jun 2003 1.00 TN-32.21 Jan 2001 Jun 2003 4.50 Yes Yes TN-32.23 Jul2001 3.50 TN-32.24 Aug 2001 3.00 Yes Yes TN-32.26 Jan 2002 1.25 TN-32.29 Feb 2002 2.00 TN-32.30 Aug 2002 c

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Yes TN-32.42 Feb 2004 1.50 Yes TN-32.43 Mar 2004 3.50 TN-32.45 Jun 2004 1.50 TN-32.47 Apr2005 1.00 TN-32.48 Jun 2006 2.00 Yes TN-32.49 Aug 2006 3.00 TN-32.52 Sep 2006 2.00 TN-32.53 Jan 2007 2.50 Yes 15

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Lead Cask Inspection Schedule

  • Planning for lead cask inspections substantially complete
  • Inspection under protective cover of TN-32.23 scheduled for October 13 (weather-dependent)
  • Inspection of bottom of TN-32.49 scheduled for October 14 17

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Summary

  • A detailed evaluation process was used to determine the lead cask(s) for inspection
  • The two casks selected are believed to best meet our selection criteria, and are representative of the aging effects of concern
  • Inspections will utilize industry-accepted standards and criteria to assess the cask conditions for license renewal
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