ML20027A415

Informs NRC of Difficulties Experienced in Completing Surveillance Requirements of Subj Facil & Obtaining Settlement Values Due to Inconsistencies Between Surveillance Requirements & Bases for Them

ML20027A415
Person / Time
Site:	North Anna
Issue date:	11/22/1978
From:	Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	Harold Denton, Parr O Office of Nuclear Reactor Regulation
References
NUDOCS 7811280308
Download: ML20027A415 (3)

Text

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VrnotNIA ELECTRIC AND Powan COMPANY Rxcnwonn,VrmonwzA sonst 2.

November 22, 1978 E

r6 Mr. Harold R. Denton, Director Serial No. 646 Office of Nuclear Reactor Regulation P0/DLB:sej

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Mr. O. D. Parr, Chief Docket No. 50-338 f -

Light Water Reactors Branch No. 3 License No. NPF-4 Division of Project Management U. S. Nuclear Regulatory Commission Washington, D. C.

20555

Dear Mr. Denton:

Survey Monitoring T.S. Surveillance Requirement 4.7.12.1 North Anna Power Station We have experienced difficulties in completing the surveillance requirements of North Anna Unit No. 1 Technical Specification 4.7.12.1 due to inconsistencies between the surveillance requirements and the bases for the requirements, typographical errors in T. S. Table 3.7-5, and deficiencies in the survey monitoring program.

The basis for surveillance requirement 4.17.12.1 states "The first survey was conducted in May 1976 to establish a base value for all survey points". The basis implies that total and differential settlements should be based on May 1976 values; however, T.S. Table 3.7-5 specifies bases other than the May 1976 basis in several cases and does not specify base value dates for survey points established after May 1976.

Difficulties in obtaining total and differential settlement values involve 27 survey points addressed by T.S. 4.7.12.1. is a i

listing of these survey points. The majority of the data acquisition difficulties encountered fit into one of two categories:

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Destroyed and Reset Survey Points l

Settlement histories are incomplete because some survey points have been destroyed due to construction activities and not immediately replaced.

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Base Values Not Established On Date Required Some points requiring a May 1976 base value were established after May 1976. Some points requiring base values on dates speci-fied by T.S. Table'3.7-5 were not surveyed for a base value on the date specified.

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Vinointa Er.zcTaic Ann Powan Couraxv to Mr. Harold R. Denton 2

We are currently reviewing all procedures and data from the first two and a half years of monitoring with the objective of improving our surveill-i ance program. Actions to prevent future survey monitoring program deficiences l

of the type described above and appropriate T.S. changes are being investigated.

There are no safety implications from any of the data collected thus far. Existing data verifies that no significant settlement has occurred. However, we believe the overall program will be enhanced by a total review of all aspects of settlement monitoring.

y/yours, r

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.Sta'lingf C.

Vice Pr sident-Power Sqpply and P duction Oper Lons cc:

Mr. James P. O'Reilly i

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Attcchment I T.S. TABLE 3.7-5 PROBLEM SURVEY POINTS SURVEY POINT LOCATION 7

Service Water Pump House 15, 16, 17, 18 Service Water Piping @SWPH 113 Unit 2 Main Steam Valve House 114 Service Building (E-17) 117 Service Building (E-14) 122 Auxiliary Building 142, 145, 146 Unit 1 Safeguards Area e

144 Unit 1 Containment 158 Turbine Building 204 Intake Structure 206, 207, 208, 209 Boron Recovery T'ank Dike 228 Decontamination Building 243 Service Building 246, 246 Fuel Oil Pump House 248, 249, 250, 251 Pipe Tunnel 4

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