ML20105C870
| ML20105C870 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 09/14/1992 |
| From: | Mcmeekin T DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-88-008, IEB-88-8, NUDOCS 9209240020 | |
| Download: ML20105C870 (3) | |
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' Dube hver Company TCeiMmN McGuire hudw Generation ikpartment nce President t
'12700 Hagm ferry Rsad (at(lulA)
(704)875-1800
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i DUKEPOWER September 14, 1992
- U.
S.
Nuclear Regulatory Commission Attention: Document Control Desk washington, D. C.
20555 Sutject:
McGuire Nuclear Station, Units 1 and 2 Docket Nos. 50-369 and 50-370 NRC'Bulletin 88-08 Thermal Stresses in Piping Connected to the Reactor Coolant System Dear Sir; In a letter dated January 2, 1991, Duke Power presented some of the results obtained while monitoring the temperatures within_the McGuire Unit 2 safety injection lines, in-response to NRC Bulletin 88-08.
The data collected at that time indicated that a-Farley type ovent was not in progress,-
that is,_there was no significant temperature cycling in any of the class 1 piping (between the check valves and-.the Reactor Coolant. System (RCS)).
The data; however, suggested that the gate valves separating the charging pumps-fromLthe P.CS (up stream-from the check valves) may be leaking..
The data also appears to suggest that the-check valves may be e
looking as well,:although not Jn a_ fashion to cause stratification, nor significant cycling behavior.
This observed phenomenon was evaluated on a qualitative basis from which it was concluded at that time that the bounding analysis described within Hal B.
Tucker's letter-dated August 28, 1989 still enveloped the phenomenon.
To address the observed events, Duke committed to perform an ASME Code compliance calculation.
By a May 31, 1991-letter, Duke reported that subsequent preliminary evaluetions-indicated a-possible problem in showing an ASME Code fatigue factor of less than one for the full 40 year. life of the units.
However; the evaluations did justify continued operation for the next five calendar years, up to May, 1996.
The May 31, 1991 letter also committed that an-action plan would be formulated and_the details of the plan would be submitted to the NRC by Septensber 15, 1991.
9209240020 920914 PDR ADOCK 05000369
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Nuclear Regulatory Commission U.
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September 14, 1992 page 2 In a subsequent September 13, 1991 letter, a brief outline of our action plan to address the issue of exceeding the fatigue factor sometime during the 40 year life of the unit
- was provided.
In addition, the September 13, 1991 letter committed to provide a status report by August 1, 1992.
In parallel, an NRC letter dated September 17, 1991 advised that the requirements of Bulletin 88-08 for McGuire Nuclear Station were met and no further action was required, in that the response was consistent with the modification or monitoring alternative stated in the bulletin.
The current status is that we are continuing our avaluation and re-analysis efforts of the data.
Based on the results of our efforts, appropriate actions will be taken to ensure that the predicted fatigue levels will remain within acceptable levels. Meanwhile, the conservative bounding analysis performed thus far allows continued operation up to May, 1996 with currently installed piping configuration.
Please note that information related to our efforts is available for NRC review at the McGuire Nuclear Site.
For these reasons, further submittal of reports to you on this issue will not be mace.
Please contact Paul Guill at (704) 875-4002 if there are any questions regarding this issue.
Very truly yours, l
f)NulY Ted C.
McMeekin l
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U..S.
Nuclear Regulatory Commission September 14, 1992 Page 3 xc:
Mr.
S.
D.
Ebneter Regional Administrator, Reg.'.on II U.
S. Nuclear Regulatory Con. mission 101 Marietta Street, NW, Suite 2900 Atlanta Georgia 30323 Mr.
P.
K. Van Doorn Senior NRC Resident Inspector, McGuire McGuire Nuclear Station Mr. T.
A.
Reed, Project Manager Office of Nuclear Reactor Regulation U.
S.
Nuclear Regulatory Commission One Whit e Flint North, Mail Stop 9H3 Washington, D.C.
20555
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