ML19210B181

Requests That Addl Analyses & Testing Be Done to Demonstrate That Offsite Power Sys Can Start & Accelerate Reactor Bldg Spray Pump Motors Under Load for Conditions Listed

ML19210B181
Person / Time
Site:	Crane
Issue date:	07/26/1974
From:	Schwencer A US ATOMIC ENERGY COMMISSION (AEC)
To:	Arnold R METROPOLITAN EDISON CO.
References
NUDOCS 7911040110
Download: ML19210B181 (2)

Text

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1 jyt, 2 6 W4 Docket,:fo. 50-289 Metropolitan Edison Company ATT'I:

Mr. Robert C. Arnold Vice President P. O. Box 542 Reading, Pennsylvania 19603 Gentlemen:

In your Ictter of May 14, 1974, you submitted test results and further analysis of the ability of the Three Mile Island Unit I reactor build-ing spray pump motors to accelerate under load. We have reviewed the results of the analysis and test and are unable to arrive at a conclusion with regard to the acceptability of the reactor building spray pump motors. We believe that your assumption, that the diesel generator as a power source represents the worst case condition for starting the subject motors, may not be the most restrictive condition for auxiliary power to the plant. The design of the electrical systems on this station includes provisions for supplying power for sequencing and starting the engineered safety feature equipment from offsite (preferred source) power, if available. The onsite power (standby) is only utilized if offsite power is unavailable. Therefore, we request that you perform additional analysis, calculations, and testing to demonstrate the ability of the offsite power system to start and accelerate the subject motors in their proper sequence of the engineered safeguards loading with the following considerations for conditions at the site:

(1) minimum voltage conditions expected at the site (2) maximum expected system impedance during the life of the plant (3) maximum transformers' impedance (4) maximum cable impedance, and (5) maximum expected transformer loading (constant INA) when starting the reactor building spray pump motors.

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tetronolitan L11 son Company NY m m TYMMI WW4WNYXYYINN XXEXRHR Pleash notify us within two weeks of the receipt of this letter of your proposed schedule of response to this request.

Sincerely.

Original Signed by Irving A.Peltier A. Schwencer, Chief Light Water Reactors Branch 2-3 Directorate of Licensing cc: George F. Trowbridge, Esquire Shaw, Pittman, Potts En Trowbridge 910 11th Street, N. W.

Washington. D. C.

20006 DISTRIBUTION:

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