ML19320A334

Submits Design Mod to Improve Condenser Outlet Temp Measurement.Revised ETS Reflecting Condenser Outlet Temp Detector Location Will Be Proposed When Mod Is Completed & Implemented

ML19320A334
Person / Time
Site:	Arkansas Nuclear
Issue date:	11/20/1974
From:	Phillips J ARKANSAS POWER & LIGHT CO.
To:	Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 8005010828
Download: ML19320A334 (2)

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T E L E.L O P..Y 40V3 h

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Arkansas Nuclear One-Unit I m

Docket No. 50-313 qI g 1974 >

Q License No. DPR-51 h k, t'1 6.M Environsontal Technical Specifications _

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Dear Hr,

Giambusso:

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'I'N Environmental Techrical Specification (BTE) 2.1.1 limita the maxinaam differential temperature (AT) across the Arkansas Nuclear Onc-Unit I condenser to 15'F during normal operation with all four circulating water pumps in operation. The AT is to be measured at the condenser inlet and outlet ovory hour utilizing the computer output or every two hours utilizing the condenser temperaturo recorJer when the computcr is inoperable.

The AT measured at 75% Full Power (PP) was 18-20*F using the computer and the condenser togorature recorder. Howevor, when the outlet temp-orature was measured at the end of the discharge flune (before mixing l

l with lako wate') it was found to bo only 6-7'F higher than the inlet.

From this, it was determined that tho outlet temperature detector, which

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is located in the dischargo pipe just outside the condonsor water box, was not measuring the true average condenser outlet temperature. The assunod cause of this is thermal stratification of the water in the water box.

To alloviste this problem we plan to mova the condensor outlet temperature dotector to a location in the discharge flume whero the circulating water will be thoroughly alxed but will bo prior to mixing with the lake water.

This will provide an accurate indication of the condensor AT to the com-puter and the condenser temperature recorder.

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• 4.Mr. A. Giasbusso November 2n,1974 In the intesgo period prior to implementation of this design change, wo propose to perform the following nonitoring of the condenser AT:

1.

With the plant operating at steady state power lovels, the condensor AT will be monitored once each shift using measure-monts at the condensor inlet and near the end of the dischargo fiume.

2.

At cach power plateau reached in the Power Escalation Soquence the condenser AT will be measured within two (2) hours after the power level has 'stabalized.

3.

If the condenser inlet tonporature excoeds 85'F with all four circulating water pump 3 running or 70*F with loss than four circulating water pumps running, the condenser outlet tonpora-turo will be monitored overy two (2) hours to assure that ETS 2.1.2 on maxhune outlet temperaturo is net.

As soon as the design change can bo made and iglomonted, we will propose l

a revised Environmental Technical Specification to reflect-the now detector location. 'The picposed nonitoring of once por shift rather than eve 2y two hours will help to roduce the currently high workload on plant personnel due to the testing program in progress.

Your prompt attention to this matter and concurrence with our proposed action is roquested.

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• yours,

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g J. D. Phillips V

i Senior Vice Prosident 1

JDP:lt cc: Mr. Noiman C. Hoseley, Director i

Directorate of Regulatory Operations United States Atomic Energy Commission l-Region II i

230 Peachtree Street, N.W., Suite-818 Atlanta, Georgia 30303 l

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