ML20214U762
| ML20214U762 | |
| Person / Time | |
|---|---|
| Site: | McGuire  |
| Issue date: | 01/06/1986 |
| From: | Tucker H DUKE POWER CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8610010393 | |
| Download: ML20214U762 (2) | |
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L-DUKE Pownn Goxmxy I'.O. HOX 33180 CIIAHLOTTE. N.C. 28242 ajn..a e4.3il IIAL H. TUCKER sa 1 t o--
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.......m W1'(TEA. P.n5M'4; TION January 6, 1986 l
M r. J. Nelson Grace, Regional Administrator U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Re: McGuire Nuclear Station, Unit 1 Docket No. 50-369 %
' Relief From Technical, Specification LCOs (Temporary Waiver)
Dear Dr. Grace:
This letter constitutes written followup of a request for temporary waiver of technical specification requirements which was made (and subsequently granted) via telecons between Duke Power Company personnel and members of your staff on January 4 and 5, 1986. This temporary emergency relief from com-pliance with technical specification Limiting Conditions for Operation (LCO) was requested to avoid unnecessarily shutting down McGuire Unit 1 since the LCOs would have been exceeded within a few hours.
At 0520 cn January 2, 1986, with the unit operating in mode 1, Chemical and Volume Control (NV) System Pump "B" (centrifugal charging pump "B") was de-clared inoperable due to pump seal leakage pursuant to Technical Specifica-tions 3.1.2.2 " Flow Paths - Operating", 3.1.2.4 " Charging Pumps - Operating",
and 3.5.2 "ECCS Subsystems - Tavg >350*F".
These specifications provide for a 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> allowed outage time (A0T) after which the pump would have to be restored to operable status or the unit placed in hot standby and borated to a shutdown margin equivalent to at least 1% Delta K/K at 200*F within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in hot shutdown within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.
Efforts to replace the seal were begun with no problems in meeting the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> A0T deadline of 0520 on January 5, 1986 foreseen. However, during final fitting of the replacement seal into the pump on January 4, 1986 a burr on the seal housing was discovered which prevented the housing from being inserted into the pump, necessitating further repair work. Best estimates indicated that this subsequent repair work and required pump alignment and performance retest ing would take an additional 10 - 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> past the A0T deadline.
Since pump repair was expected to be completed at about the time the unit j
reached borated shutdown conditions (assuming compliance with the Tech.
I Specs.), which would then result in deboration and unit startup, it was decided to pursue a temporary waiver to avoid this unnecessary cycle.
ho h 860I06 05000369
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..s j-s Dr. J. Nelson Grace January 6, 1986 Page 2 Consequently, on January 4, 1986 Mr. N.A. Rutherford (DPC) contacted Mr. i!.C. Dance of your staf f requesting a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> extension of the A0T's to allow for pump seal replacement to be completed.
This request was based on the redundant NV Pump "A" being operable, the low probability of an acci-dent requiring use of NV Pump "B" occurring during this short additional time period, and the desire to avoid a thermal cycle on the reactor and associated systems which has real benefits in terms of availability, component lifetime, and safety.
Following consultation with yourself, this temporary waiver re-quest was verbally granted by Mr. Dance on January 5, 1986.
NV Pump "B" was eventually repaired, tested, and declared operable at 1859 on January 5, 1986. A Licensee Event Report will be submitted detailing this event. Duke would like to express its appreciation for the NRC's timely cooperation in this matter.
Should there be any questions or if additional information is required, please advise.
Very truly yours, eekt?
Hal B. Tucker PBN/j gm xc:
Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Mr. Dayne Brown, Chief Radiation Protection Branch Division of Facility Services Department of Human Resources P.O. Box 12200 Raleigh, NC 27605 Mr. W.T. Orders Senior Resident Inspector McGuire Nuclear Station Mr. Darl Hood Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.
20555