ML19209B546
| ML19209B546 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point, Cook  |
| Issue date: | 06/22/1979 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML18136A035 | List: |
| References | |
| NUDOCS 7910100093 | |
| Download: ML19209B546 (1) | |
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s DONALD C. C00K NUCLE 4R PLANT UNITS 1 AND 2 REVIEW 0F PIPING REANALYSIS PER ILE BULLETIN 79-07 SAFETY EVALUATION REPORT 00
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ENGINEERING BRANCH U
U lL1 DIVISION OF OPERATING REACTORS INTEDDUCTIC"/ SACK 5ROUND.
In their April 24, 1979, response to ILE Bulletin 79-07, American Electric Power Service Corporation (AEP) identified 24 lines that had oricinally been analyzed using an earlier version of the WESTDYN computer program that incorporated an algebrale sum of intramodal responses to seismic loadin s.
However, 19 out of these 24 lines had subsequently been reanalyzed using usolute su raation or
SRSS method.
Ey istter dated May 4,1979, the licensee (AEP) reported that a further check of their records shewed that 23 of the 24 lines had previously been reanalyzed.
In response to NRC questions discussed during telephone conversations, AEP sup;1ied supplemental information on this subject in a letter dated Jurre 20, 1979.
DISCUSSICN The licensee identified the only line that had not been seismically reanalyzed was the 14" pressurizer surge line.
Thjs line has the same' geometry on both units, but in opposite hand, therefore, only one stress analysis was necessary.
AEP has stated that a reanalysis of the surge line in the "as-built" condition has been completed and the results show all piping stresses remain below their alicwable values, as specified in the FSAR's. Additionally, the pipe supports meet FSAR criteria and the nozzle loads have been found acceptable.
This piping run was reanalyzed by Westinghouse using their current. version of WESTDYN which comoines the intramodal responses by absolute sunnation.
-The licensee's response to ILE Bulletin 79-04 also states that no VELAN swing check valves are in this piping.
ILE Bulletin 79-02 was not addressed at this tice.
The lice.see has stated that the reanalysis has no effect on pipe break criteria Si.:a :rsa'< iocitions were nct p:stulated based en stress levels.
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