ML20213C780
| ML20213C780 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 05/02/1986 |
| From: | Tucker H DUKE POWER CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8611100269 | |
| Download: ML20213C780 (2) | |
Text
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May 2, 1986 Dr. J. Nelson Grace, Regional Administrator U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, GA 30323 RE: Catawba Nuclear Station, Unit 2 Docket No. '50-414 0
- Relief fromLTechnical' Specification'
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 May 1, 1986. This temporary emergency relief from compliance with Technical Specification Limiting Conditions for Operation (LCO) was requested to avoid unnecessarily forcing Catawba Unit 2 to MODE 4 (HOT SHUTDOWN) since the LCO would have run out at 1:30 A.M. on May 2, 1986.
The proposed relief request was the result of the Auxiliary Feedwater (CA)
System Turbine Driven (T/D) Pump not passing its surveillance requirements (Specification 4.7.1.2.la.2).
We have determined that foreign material in valves 2CA181 and 2CA20 was the cause of the problem. The pump was run the night of May 1, 1986 and passed its surveillance requirements. However, we have not declared the pump operable in order to reinstall a pipe support at valve 2CA20. We expect this to be completed by May 3, 1986.
The pump was run the night of April 30, 1986. The pump run involved using the CA T/D pump to pump water to one Steam Generator. Although there was not enough flow to allow the pump to pass the surveillance requirements, it did indicate that the pump was capable of performing satisfactorily. The CA T/D pump had last passed its surveillance requirements during Hot Functional Testing (HFT) on approximately September 29, 1985. The amount of time to identify and repair the problem would have exceeded the allowed outage time.
Providing an -additional 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br /> allowed the problem to be identified and repaired without forcing the unit to HOT SHUTDOWN.
The function of the CA System is to provide feedwater to the S/G's in the event the Condensate /Feedwater system is lost. This water ensures a decay
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N heat removal path to cool the Reactor Coolant System until such time the pf
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t 0 Residual Heat Removal System may be operated. At this time, Unit 2'li
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l Dr. J. Nelson Grace May 2, 1986 Page 2 been critical. Therefore, there is no decay heat present that would l
require the CA T/D pump to be operable. The CA motor driven pumps are operable at this time. Therefore, granting this request posed no undue l
risk to the health and safety of the public. Also, one thermal cycle on l
the reactor was avoided. This has real benefits in terms of availability, component lifetime and safety.
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Very truly yours, i
i p.,a Hal B. Tucker RWO/jgm I
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Mr. Harold R. Denton, Director l
Office of Nuclear Reactor Regulation U.S. Nuclear Reactor Regulation
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Washington, D.C.
20555 NRC Resident Inspector Catawba Nuclear Station I
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