ML20108D454

Responds to Request for Info Re Suppression Pool Temp Measurements Method During Startup Testing & Initial Plant Operation.Safety/Relief Valve Actuation Will Be Tested to Measure Pool Temp & Demonstrate Pool Mixing

ML20108D454
Person / Time
Site:	Fermi
Issue date:	03/06/1985
From:	Jens W DETROIT EDISON CO.
To:	Youngblood B Office of Nuclear Reactor Regulation
References
NE-85-0343, NE-85-343, NUDOCS 8503080367
Download: ML20108D454 (2)

Text

,,

Wryne H.Jens k

Wce President Nuclear Operatons Fermu2 Edison =400 North Du;e Hv1way 6

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March 6, 1985 NE-85-0343 Director of Nuclear Reactor Regulation Attention:

Mr. B. J. Youngblood, Chief Licensing Branch No. 1 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Reference:

Fermi 2 NRC Docket No. 50-341

Subject:

Sunoression Pool Temperature Measurements The-purpose of this letter is to respond to a recent request from the NRR Project Manager (Mr. M. D. Lynch).

The discussion below describes the Detroit Edison pro-gram that will be used to measure suppression pool tem-peratures during startup testing and initial plant operation.

Prior to operation at full power, a test shall be per-formed involving a safety / relief valve (SRV) actuation to accomplish the following:

o Measure the pool temperatures in all eight sectors of the suppression pool at approximately 5 minute intervals.

Demonstrate tgat all adjacent temperature readings o

are within 45 F of each other throughout SRV actuation with suppression pool mixing due to operation of a reactor heat removal system pump.

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8503080367 850306 PDR ADOCK 05000341 A

PDR

a Mr. B. J. Youngblood March 6, 1985 NE-85-0343 Page 2 Reperform an SRV actuation without suppression pool o

mixing or cooling and record the test data in the manner described above.

(Technical Specification maxium temperature limitations will not be exceeded.)

Measure temperatures in all eight sectors of the suppression pool for 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or until thermal equilibrium of the pool is reached.

Demonstrate that using the seven sector method, excluding the highest sector suppression pool temperature reading, will yield a conservative value for the bulk temperature of the suppression pool within a 48-hour period.

During the first year of normal operation under Opera-tional Conditions 1 and 2, the following information shall be recorded:

The suppression pool temperatures in all eight o

sectors every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

The conditions in the suppression pool which at the o

time promoted mixing, if applicable (e.g., cooling of the suppression pool or actuation of an SRV).

The data recorded above shall be submitted to the NRC before startup fgllowing the first refueling outage.

In the. event the 45 F temperature differential is exceeded, such an occurrence shall be reported per 10CFR50.73.

Please direct any questions to Mr. O. K. Earle at (313) 586-4211.

Sincerely,

},

cc:

Mr. P. H. Byron

[

Mr. M. D. Lynch

\\v USNRC Document Control Desk Washington, D. C.

20555

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