ML20038C670
| ML20038C670 | |
| Person / Time | |
|---|---|
| Site: | 07109010 |
| Issue date: | 12/01/1981 |
| From: | Parker W DUKE POWER CO. |
| To: | Jennifer Davis NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| 20011, NUDOCS 8112140019 | |
| Download: ML20038C670 (2) | |
Text
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December 1, 1981 3 *
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-s Mr. John Davis, Director
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Nuclear Material Safety and Safeguards, NMSS A
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U. S. Nuclear Regulatory Commission
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Re: Oconee Nucicar Station w " % ? c.,
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Docket Nos. 50-269, -270, -287 Q
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Dear Sir:
s'b At approximately 0800 hours0.00926 days <br />0.222 hours <br />0.00132 weeks <br />3.044e-4 months <br /> on Tuesday, November 3, 1981, Oconee Nuclear Station (ONS) personnel were informed by McGuire Nuclear Station (MNS) per-sonnel that the NLI-1/2 shipping cask was received with spent fuel assembly 1All in a water environment. This is in violation of item 6 of Certificate of Compliance No. 9010, Revision No. 7 for the Model No. NLI-1/2 shipping package which requires that the cask be shipped dry in a Helium atmosphere.
Pursuant to 10 CFR 71, 571.61, which requires that a report be submitted within thirty (30) days concerning any instance in which there is substantial reduction in the effectiveness of any authorized packaging during use, Duke Power Company is providing the following information.
The spent fuel shipping cask that is being used for all spent fuel shipments from the Oconee Nuclear Station to the McGuire Nuclear Station is the NLI-1/2 shipping cask #1, serial number 5382. The cask is loaded and prepared for shipment in the Oconee Unit 3 spent fuel pool decontamination pit and fuel receiving area.
To prepare the cask for shipment, quick-disconnect fittings are attached to valves V-1 and V-2 which are located on the inner closure head in order to vent and drain the cask cavity. Valve V-1 is used to pressurize and flush the cask cavity with demineralized water and to repressurize the cavity with Helium. Valve V-2 is used to drain the cask.
If the drain line is connected to valve V-1 and the fill / vent line is connected to valve V-2, the procedure will not be done correctly and most of the water will remain in the cask.
At one time valve V-1 was color coded yellow. Ilowever, with use, the paint has worn off.
Immediate corrective action was performed at the McGuire Nuclear Station by placin;; Fuel Assembly 1All in the McGuire Fuel pool.
Fur-ther corrective action was taken by inscribing "V-1" and "V-2" by the appro-priate fill / vent and drain connections. procedure changes were made to insure correct book-up of the vent and drain lines to valves V-1 and V-2.
The corrective action taken is considered adequate to prevent any further recur-rence of this incident.
m-8112140019 811201 f
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e Mr. John Davis, Director December 1,1981 Page 2 While the fuel assembly was in the cask at Oconee, in transit from the Oconee Nuclear Station to the McGuire Nuclear Station, and at McGuire, the water temperature remained well below the boiling point, thereby prohibiting pressure buildup. The preceding statement is based on a calculation assuming no heat transfer from the cask. The calculated water temperature upon ter-mination of the incident was 116 F, 96 less than the boiling point.
Long cooled fuel was selected for the beginning shipments to reduce all aspects of transshipment to a minimum. Thus, the 187 watt decay heat of the fuel assembly transported is considerably less than 10.6 kilowatts author-ized by the Certificate of Compliance.
Since there was no internal cask pressure increase during this incident, no danger to the health and safety of the public was experienced. The cask integrity was never threatened during the incident.
Very truly yours,
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William O. Parker, Jr. (_s JLJ/php cc:
Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303
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