ML19312B836

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Forwards Proposed Tech Spec 3.7 Re Limiting Conditions for Transmission Line Paths & Monitoring Operations
ML19312B836
Person / Time
Site: Oconee  Duke Energy icon.png
Issue date: 10/13/1976
From: Parker W
DUKE POWER CO.
To: Rusche B
Office of Nuclear Reactor Regulation
Shared Package
ML19312B837 List:
References
NUDOCS 7911250047
Download: ML19312B836 (4)
v • d • e


Text

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Duke Power Co oATE oF DOCUMENT 10-13-76 Mr Rusche l Charlotte, NC oATE RECEiveo l

W O Parker Jr 10-19-76 )

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coPv 3 signed DESCRIPT60N ENCLOSURE Ltr notarized 10-13-76....trans the follow: Amde to OL/ Change to Tech Specs: Consisting of revisions to tech specs with regard to l limiting conditions for operation with regard to transmission line paths &

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Mr. Benard C. Rusche, Director #

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RE: Oconee Nuclear Station  % '

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Docket Nos. 50-269, -270, -287 -1 ]

Dear Mr. Rusche:

Oconee Nuclear Station Technical Specifiation 3.7 identifies limiting condi-tions for operation of the Oconee Auxiliary Electrical Systems. The onsite power system is provided by two 87.5 MVA hydroelectric generators (Keowee Hydro Station) supplying power through two separate, redundant, diverse trans-mission paths. Additionally, combustion turbines located at the Lee Steam Station, using an isolated 100KV transmission path, provide a substitute power source primarily during periods when the hydro units are not available. Expected maintenance periods when both Keowee units are to be unavailable were stated in FSAR Section 8.2.3(c) as 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> each year plus 4 days once every 10 years.

These outages are necessary for turbine and penstock inspection and maintenance.

Provisions have also been made in the specifications for instancos when one Keowee units is unavailable for test or maintenance for periods not to exceed 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. In instances where one Keowee generator is expected to be unavailable greater than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, the Lee combustion turbine is placed in operation at rated speed, with no load and is directly connected through the isolated 100KV transmission line to the Oconee standby buses for automatic selection in the event 230 KV power is lost. Continued reactor power operation or restart from hot conditions is permitted; however, present technical specifications preclude I a reactor startup from cold conditions.

Inspections of the Keowee hydro units and similar hydro units on the Duke system have indicated that maintenance of several weeks duration may be necessary periodically. Techniques have been devised which will permit the removal from service of one Keowee hydro unit at a time for this maintenance.

This will be accomplished by dewatering the common penstock of both hydro units, locking and sealing the wicket gates of the unit to be maintained and rewatering the penstock to return the remaining hydro to service. This opera-tion will normally require less than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> and the Lee Combustion Turbine will be in operation continuously from the beginning of this evolution until both hydro _ units are returned to an available status. The frequency of this maintenance is not expected to significantly affect the assumed periods of unavailability of both Keowee units.

10580

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Mr. Bancrd C. Rucch2 Paga 2

, o . October 13,1976 In order to provide increased flexibility of operation and maintenance of the Oconee electrical system however, proposed revisions to the Oconee Nuclear Station Technical Specifications are requested pursuant to 10CFR50, 550.90.

These revisions are indicated on the attached replacement pages. The time permitted for operation with one Keowee unit inoperable has been extended from 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />; however, testing of the remaining hydro unit is performed within one hour and every eight hours thereaf ter to provide assurance of its operability. The period for operation with the underground feeder circuit unavailable has also been increased from 24 to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. Additionally reactor heatup above 2000F is permitted when one Keowee hydro unit is available and the Lee Combustion Turbine is La operation on the isolated 100KV transmission line. This is considered to be an acceptable alternative due to the known availability of the dedicated running combustion turbine.

Your prompt consideration of this request is solicited in order to assist our planning.

Very uly yours, I

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William O. Parker, Jr(.

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Mr. Benard C. Rusche Page 3 October 13,1976 WILLIAM 0. PARKER, JR., being duly sworn, states that he is Vice President of Duke Power Company; that he is authorized on the part of said Company to sign and file with the Nuclear Regulatory Ccmmission this request for amendment of the Oconee Nuclear Station Technical Specifications, Appendix A to Facility Operating Licenses DPR-38, DPR-47 and DPR-55; and that all statem ta and matters set forth therein are true and correct to the best of h knowledge.

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William O. Parker, Jr. , Vfed President ATTEST:

I ohn C. Goodman, Jr.

Assistant Secretary 'f Subscribed and sworn to before me this 13th day of October,1976.

r '26 c SMU Notary Public r

i My Commission Expires:

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