ML20203B407
| ML20203B407 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 02/17/1998 |
| From: | Ohanlon J VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Paperiello C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| Shared Package | |
| ML20203B410 | List: |
| References | |
| 98-054, 98-54, TAC-L22113, NUDOCS 9802240281 | |
| Download: ML20203B407 (6) | |
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i YlHOINIA ELI!CTHIC AND l'OWI!H COMI*ANY I{IrllMOND,YIHOINIA DDD 01 February 17, 1998 Mr. Carl J. Paperiello, Director Serial No.
98 054 Office of Nuclear Material Safety and Safeguards NL&OS/TJS RO U. S. Nuclear Regulatory Commission Docket No. 72-16 Washington, D. C. 20555 Gentlemen:
y.EGINIA ELECTRIC AND POWER COMPANY NORTH ANNA INDEPENDENT SPENT FUEL STORAGE INSTALLATION flSFS1)
RESPONSE TO REQUEST FOR ADDITlQHAL INFORMATION (TAC NO. L22113)
Virginia Electric and Power Company (Virginia Power) submitted an application for the review and approval of a site specific license for an independent spent fuel storage installation (ISFSI) at North Anna Power Station on May 9,1995 (Serial No.95-195).
The NRC submitted a Request for Additional Information to Virginia Power on January 16,1998 concerning the thermal design criteria of the fuel assemblies to be stored in the North Anna Power Station ISFSI and the concrete pad static analysis. Attached is our response to the Request for AdditionalInformation.
Please contact us if you have any questions or require additionalinformation.
Very tru!y yours, h
James P. O'Hanlon
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Senior Vice President - Nuclear Attachments Commitments made by this letter:
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None 98o2240281 980217 PDR ADOCK 0500o338 J
I cc: Mr. J. W. Shes Office of Nuclear Material Safety and Safeguards U. S. Nuclear Regulatory Commission, Mail Stop 0-6 G.22 Washington, D. C. 20555 United States Nuclear Regulatory Commission Attention: Document Control Desk Washington, D. C. 20555 Mr. M. J. Morgan NRC Senior Resident Inspector North Anna Power Station i
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2 ATTACHMENT 1 Response To A Request For AdditionalInformation Fuel Assemblies to be Stored in the North Anna ISFSI 1.0 INSOLATION DESIGN CRITERIA 1.1 NRC BACKGROUND COMMENT
- Section 2.3.2.1 of the North Anna ISFSI Safety Analysis Report (SAR) states that the insolation data from Regulatory Guide 7.8 is 800 g-cal /cm per day for a horizontally transported cask and that the Regulatory Guide defines the design insolation as 400 g-cal /cm' per day for stetionary and vertically stored casks. Regulatory Guide 7.8 uses the insolation data given in 10 CFR 71,71(c)(1) which is not as stated in the North Anna ISFSISAR.
Section 2.3.2.1 and Table 3.4-1 of the North Anna ISFSI SAR state that 800 g-cal /cm' will be used as the design criterion for the storage casks. The North Anna ISFSI SAR uses the TN 32 as its design basis storage cask. However, the maximum solar heat i
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load used in the TN 32 TSAR is 2950 BTU /ft (800 g-cal /cm ) for flat surfaces and 1474 BTU /ft' (400 g cal /cm ) for curved surfaces. The TN-32 cask was not analyzed for 800 g cal /cm on the curved surfaces, as might be inferred from Section 2.3.2.1 and Table 3.41. Therefore, it does not appear to meet the design criterion specified in the North Anna ISFSI SAR."
1.2 NRC REQUEST
" Clarify the insolation design criterion used for the North Anna Spent Fuel Storage Cask and justify any deviation from the TN-32 TSAR design criterion. If the North Anna design criterion are different from the TN 32 TSAR design criterion, demonstrate that the TN 32 meets the North Anna design criterion."
1.3 VIRGINIA POWER RESPONSE Virginia Power will propose to revise Section 2.3.2.1 of the draft North Anna ISFSI Safety Analysis Report (SAR) to reference the insolation criteria in 10 CFR 71.71(c)(1).
This proposed revision will clarify that North Anna's insolation design criteria ve the same as used in the TN 32 TSAR.
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2.0 MAXIMUM DECAY HEAT DESIGN CRITERIA 2.1 NRC BACKGROUND COMMENT
" Table 3/41 of the North Anna Technical Specifications lists a decay heat of 0.843 kw/ assembly whereas Table 3.1-1 of the North Anna ISFSI SAR, states that the maximum decay heat is specified in the storage cask TSAR. Virginia Power proposes to use the TN 32 as its storage cask at the North Anna ISFSI.
The maximum decay heat listed in the TN 32 TSAR is 0.847 kw/ assembly, therefore, there is a discrepancy between these two tables."
2.2 NRC REQUEST
" Change the North Anna ISFSI SAR and/or the Technical Specifications so that both give the same decay heat value."
2.3 VIRGINIA POWER RESPONSE Virginia Power will propose to revise Table 2.1-1 of the draft North Anna ISFSI Technical Specifications to use the decay heat limit of 0.847 kw/ assembly for the TN-
- 32. This proposed revision was included in our January 30,1998 response to your December 29,1997 RAI concerning fuel assemblies to be stored in the North Anna ISFSI. A draft copy of the revised table is provided below.
Draft NAPS ISFSI Technical Specifications Table 2.1-1 Fuel Assembly Characteristics 1.
TN-32 a.
Initial Enrichment 5 3.85 w/o U235 b.
Fuel Assembly Average Burnup 5 40,000 MWD /MTU c.
Cooling Time After Discharge 2 7 Years d.
Decay Heat / Fuel Assembly 5 0.847 Kilowatts e.
Gamma Source / Cask 5 2.31E17 Photons /Sec f.
Neutron Source / Cask 5 4.83E9 Neutrons /Sec g.
Fuel Assembly Design Westinghouse 17x17 Standard or Westinghouse 17x17 Vantage SH
3.0 CONCRETE PAD STATIC ANALYSIS 3.1 NRC BACKGROUND COMMENT
- Section 4.2.1.1 (static analysis) of the Nor+h Anna ISFSI SAR discusses the concrete storage pad design."
3,2 NRC REQUEST
" Provide the calculation package of the static analysis to demonstrate that the cask storage pad and areas have been designed to adequately support the static load of the stored casks."
3.3 VIRGINIA POWER RESPONSE Please find attached a copy of Virginia Power Calculation CE-1181, Revision 0, pages 1 through 25, including Attachments A through D, which contain the requested static I
analysis portion of the North Anna ISFSI storage pad.
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