ML19260E261
| ML19260E261 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 02/04/1980 |
| From: | TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML19260E260 | List: |
| References | |
| NCR-CEB-80-2, NUDOCS 8002140356 | |
| Download: ML19260E261 (1) | |
Text
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ENCLOSURE SEQUOYAH NUCLEAR PLANT UNIT 1 INCORRECT VALVE DATA USED IN PIPING ANALYSES OF LINES PENETRATING THE STEEL CONTAIN}iENT VESSEL NCR CEB 80-2 10 CFR 50.55(e)
FINAL REPORT Description of Deficiency While performing the DBA analysis for a previous nonconformance (NCR CEB 79-19 Rl), it was discovered that 54 piping analysis problems had been analyzed using incorrect valve data.
In 16 of these piping analysis problems, the incorrect valve data that was utilized yielded incorrect results as to pipe stresses and support design.
Incorrect valve data was utilized in the initial analysis of 54 piping analysis problems.
documentation changes because the incorrect data did not affect t original piping analysis results.
problems required reanalysis.
The balance of the 54 piping analysis All valves involved in the problems to be reanalyzed are in piping two inches or less.
where the following systems penetrate the steel containment:They arc station drainage, service air, control air, and waste disposal. ice condenser, This deficiency is an isolated instance wherein the piping analysis used non-QA valve data.
associated with NCR CEB 79-19, the incorrect valve data wa other-than-normal means.
Safety Implications Statement Had this condition gone uncorrected, certain piping systems would have b overstressed during a DBA and could, as a consequence, result in a brea h een in containment integrity.
operation of the plant.
This could have adversely affected the safe c
Corrective Action All of the 16 problems that required reanalysis have been reanalyzed u i the correct valve data.
been placed on piping isometrics.The results of the correct valve data reanalyses have s ng or modified as required to meet Pipe supports are now being added, moved, the piping code stress allowables.
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