ML20064H269
| ML20064H269 | |
| 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 |
| Shared Package | |
| ML20064H263 | List: |
| References | |
| NUDOCS 7812180302 | |
| Download: ML20064H269 (2) | |
Text
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VIRGINIA ELzcTRIC AND Powen CoxrANY Rrcaxown VraorwzA nonst
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November 22, 1978 Mr. Harold R. Denton, Director Serial No. 646 Office of Nuclear Reactor Regulation PO/DLE:sej o
Atta:
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 Unic 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 settle =ents 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 listing of these survey points. The majority of the data acquisition difficulties encountered fit into one of two categories:
1.
Destroyed and Reset Survey Points Settlement histories are incomplete because some survey points have been destroyed due to construction activities and not immediately replaced.
2.
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-
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date specified.
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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-ance program. Actions to prevent future survey monitoring program deficiences of the type described above and appropriate T.S. changes tre 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.
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y'yours, r
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C.
. Scal.lin Vice Pr sident-Powe S pply and P oduction Oper t ons cc:
Mr. James P. C'Reilly 0
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