ML20151X801
| ML20151X801 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 09/10/1998 |
| From: | Matthews W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 98-383, NUDOCS 9809170257 | |
| Download: ML20151X801 (2) | |
Text
_ _ _
a VIHOINIA ELucTHIC AND Powen COMPANY i
HIcIIMOND, VIRGINIA 20261 September 10,1998 United States Nuclear Regulatory Commission Serial No.98-383 Attention: Document Control Desk MPW Washington, D.C. 20555 Docket Nos. 50-338,339 License Nos. NPF-4,7 Gentlemen:
i VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNITS 1 AND 2 SERVICE WATER GROUND WATER SPECIAL REPORT North Anna Technical Specifications (TS) Section 6.9.2 requires a Special Report to be i
submitted when groundwater levels specified for the service water reservoir have exceeded the current maximum water level. Since December 10,1996, a total of five Special Reports have been submitted to document piezometer P-22 exceeding the
{
maximum water level. On June 22,1998, during the performance of TS surveillance 4
tests the groundwater level at piezometer P-22 was again noted to be above the maximum water level by 0.71 feet.
1 Initial corrective actions identified the need to increase the frequency of piezometer monitoring and the installation of additional piezometers at the toe of the slope along the southeast section to provide additional reference information.
Monitoring was increased from semi-annually to monthly to confirm acceptable seerage conditions. To date, two standpipe piezometers, P-23 and P-24, have been instatied at the toe of the slope adjacent to piezometers P-21 and P-22. Measurements are currently scheduled for once a month until it is determined the water levels have stabilized, at which point measurements will revert to the frequency required by the station TS.
The measurements taken for piezometer P-24, which is closest to P-22, is below the TS limit of 280 feet.
A change to the Updated Final Safety Analysis Report (UFSAR) has been approved for submittal to reflect the current configuration. A change to the station TS maximum water level requirement is also being pursued.
Increased water level has been evaluated and does not indicate a significant reduction of the stability of the service water reservoir dike.
No new commitments are made as the result of this special report.
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The Station Nuclear Safety and Operating Committee has reviewed this report. Should you have any questions regarding this report, please contact us.
Very truly yours, l
I i
DM% L W. R. Matthews Site Vice President i
cc:
U. S. Nuclear Regulatory Commission Region ll Atlanta Federal Center 61 Forsyth St., SW, Guite 23T85 Atlanta, Georgia 30303 Mr. M. J. Morgan NRC Senior Resident inspector North Anna Power Station
.