ML20099D935

Submits Addl Info Re 841109 Tech Spec Change Request 102 Concerning Overpower & Overtemp Delta Temp Compensation

ML20099D935
Person / Time
Site:	Point Beach
Issue date:	11/15/1984
From:	Britt WISCONSIN ELECTRIC POWER CO.
To:	Harold Denton, John Miller Office of Nuclear Reactor Regulation
References
NUDOCS 8411210023
Download: ML20099D935 (2)

Text

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j l%sconsm EAecinc mcomur 231 W. MICHIGAN, i.0. BOX 2046, MILWAUKEE, WI 53201 November ~15, 1984 Mr. H. R. Denton, Director Office of Nuclear Reactor Regulation U. S. NUCLEAR-REGULATORY COMMISSION Washington, D. C.

20555 Attention:

~Mr. J. R. Miller, Chief Operating Reactors, Branch'3 Gentlemen DOCKET NOS. 50-266 AND 50-301 ADDITIONAL INFORMATION CONCERNING TECHNICAL SPECIFICATION CHANGE REQUEST NO. 102 OVERPOWER AND OVERTEMPERATURE AT LAG COMPENSATION POINT BEACH NUCLEAR PLANT, UNITS 1 AND 2 Our letter dated November 9, 1994 requested license amendments for Point Beach Nuclear Plant, Units 1 and 2, to incorporate additions to the Technical Specifications whichLspecify the time constants utilized in the measured AT and average temperature lag compensations which are part of the instrumentation for the overtemperature and overpower AT sensing circuitry.

A correction to Technical Specification page 15.2.3-3 was sent with our letter dated November 14, 1984.

Based on a phone conversation between the NRC, Westinghouse, and our Nuclear Power Department on November 15, 1984, the following clarification to our November 9 amendments request is provided.

Analytically and electrically there is no difference between use of a Sostman RTD with no filter and a Rosemont RTD with a two-second filter.

Based on the manufacturer's test data, as relayed to us by Westinghouse, the.Sostman RTD has a response time of 2.0 to 2.5 seconds.

Therefore, the time constants, T

and Tg, for tho'Sostman RTD's are set equal to zero to provide an overall lag of 2.0 to 2.5 seconds.

Similarly, the Rosemont RTD has a rasponse time of 0.5 seconds.

Therefore, the time constants, ta and tg, for the Rosemont RTD's are set equal to 2.0 seconds to give an overall lag of no greater than 2.5 seconda.

Documentation of the manufacturer's test results will be provided to you within thirty days as requested.

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Mr. H.s R. Denton ) November 15, 1984-

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4 IThe accident 1 analyses which: incorporate.the overpower 4

-AT-and overtemperature AT functions have.a'. sufficient margin of

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conservatism to-'accommoda,te1 degradation;of.the.Rosemont RTD1 response time'toitwice-its-typical value'of.0.5: seconds'.

However,;

as requested by the NRCJstaff,,duringLthe upcoming-fuel cycle weiwill develop a method.to conduct. noise signature testing of.

c the - RTD's as -a means of ~ monitoring 'RTD ' response ' time' degradation.

The testing willlbe conducted-on a refueling. cycle-periodicity.

.. -If you,havefany further questions,:please contact-us 2

immediately.

Very truly;yours, Y}

President R. W. Britt

' Copies to NRC Resident Inspector R.

S. Cullen, PSCW

-t Subscribpd and sworn to before me this y day of November 1984.

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' Notary Public, State of dconsin My Commission expires Idv '/ /M/.

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