ML20095B250

Special Rept:On 920319,total Settlement of Corner of Fuel Oil Pumphouse (Survey Point 246),as Defined by Survey, Exceeded 75% Allowable Value of .030 Feet.Per Technical Rept CE-0019,structural Integrity Has Not Been Compromised

ML20095B250
Person / Time
Site:	North Anna
Issue date:	04/14/1992
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
92-277, NUDOCS 9204220056
Download: ML20095B250 (2)

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. VinoisiA Et,1mTuir Axn Powrn CostrAsv Itio nsio x n.Y uu n xia u n e n April 14, 1992 U.S. Nuclear Regulatory Commission Serial No.92-277 Attention: Document Control Desk NAPS /MJ3 Washington, D.C. 20555 Docket Nos. 50-338 50 339 License Nos. NPF-4 NPF-7 Gentlomen:

yJRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNITS 1 AND 2 TOTAL SETTLEMENT OF THE FUEL Oil PUMPjiQ_t1SE On March 19,1992, the total settlement of a comer of the Fuel Oil Pumphouse (survey point 246), as defined by survey, exceeded 75 percent of the allowable va!ue of 0.030 ft. as specified in Technical Specification 3.7.12.1 Table 3.7-5. A Deviation Report was issued on March 19,1992, based on this data. The total settlement of point 246 as recorded by the survey was 0.023 feet. or 76.7 percent of the allowab!e value. During the last performance of the survey in October 1991, the total settlement of the point, as defined by survey, was 0.020 feet or 66.77% of the allowable value.

This special report is submitted pursuant to the requirements of Technical Specification 5.7.12.1.

The basis for monitoring the total settlement of the Fuel Oil Pumphouse is the settlement induced stress placed on the Fuel Oil System piping which is attached to the Fuel Oil Pumphousa. The Fuel Oil Pumphouse is a rock-founded structure. As described in lechnical Report CE-0019, " Evaluation of Settlement Monitoring program for Main Plant Structures in Proposed Changes to Technical Specification 3/4.7.12,"

dated September,1989, rock-founded structures have not experienced settlement On October 2,1989, Virginia Electric and Power Company submitted a Technical Specification change request (Serial No. 89-R82) which proposed the deletion of the requirement to monitor survey point 246 along with other rock founded structures.

Technical Report CE-0019, which was Attachment 4 to this October 1989 submittal, provides the technical bases for deletion of the requirement to monitor this and other points.

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9204220056 92-0414 PDR ADOCK 05000339 S PDR

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Based upon the evaluation contained in Technical Report CE-0019, the structural integrity of the pipi a monitored by point 246 has not been compromised. This special report has been reviewed by the Station Nuclear Safety aad Operating Committee.

Should you have any questions regarding this report, please contact us.

Very truly yours, -

- - a; y W. L. Stewart Senior Vice President - Nuclear cc: U.S. Nuclear regulatory Commission Region il 101 Marietta Street, N.W.

Suite 2900 Atlanta, Georgia 30323 Mr. M. S. Lesser NRC Resident inspector North Anna Power Station i

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