ML20114B512

Provides Schedule for Completion of Mod to Fire Protection Equipment.Installation Deferred Due to Schedule Conflict W/License Condition C(6)(d) Which Requires Mod Prior to Exceeding 5% Power

ML20114B512
Person / Time
Site:	Byron
Issue date:	01/21/1985
From:	Tramm T COMMONWEALTH EDISON CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
9658N, NUDOCS 8501290265
Download: ML20114B512 (2)

Text

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1. ~ f C N Commonwealth Edison

./ ) one First National Plaza. Chicago. litinois

( O 7 Address Reply to: Post Office Box 767 (j Chicago, lilinois 60690 January 21, 1985

'Mr.~ Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555

Subject:

Byron Generating Station Unit 1 Fire Protection

-NRC Docket No. 50-454

Dear Mr. Denton:

This letter is provided to inform the NRC of the present schedule for-completion of a modification to the fire protection equipment at Byron Unit 1. This notice is necessary because the installation schedule conflicts with a Condition of the current Operating License, NPF-23.

License Condition C(6)(d) requires all modifications related to conformance with the National Fire Protection Association (NFPA) code to be completed prior to exceeding 5% power. As indicated in Table 3-1.of the Byron /Braidwood Fire Protection Report, Commonwealth Edison's response to Deviation 10 from NFPA 15 indicated that we would modify the temperature instrumentation in the auxiliary building ventilation system charcoal filter plenums. This instrumentation is installed to detect charcoal fires. The modification, which extends the temperature sensors across the full

,- . length of.the filter frame, was to have been completed prior to exceeding 5% power.

J The new temperature detection equipment has beeti purchased  ;

and delivered'to the Byron site. To avoid possible damage to the equipment however, installation is being deferred until the ANSI N510 testing of the charcoal filters is completed. During the course of such testing it may be necessary to adjust or remove and replace the charcoal cells. That activity would very likely cause damage to the new capillary tube temperature sensors which are to be installed along the filter frame proximate to the charcoal cells.

If'these sensors-were installed before completion of the filter testing, any damage to these sensors would delay both the filter testing and the operation of the temperature detection instrumentation.

Interim compensatory measures are being taken to ensure plant safety while the temperature detection instrumentation is inoperable. As required by Byron Technical Specification 3.3.3.7 governing inoperable fire detection instrumentation, a fire watch hMboNkpop F sj O

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H. R. Der. con January 21, 1985 patrol has been established to inspect the carcoal filters to least once per hour. Of course, the installed fire suppression systems for these filters are already operable. Each filter plenum has a manual water deluge system. Because the present Technical Specifications provide for adequate interim compensatory measures, no special License Condition is being proposed.

Please address any questions regarding this matter to this office.

One signed orinigal and fifteen copies of this letter are provided for NRC review.

Very truly yours,

/b[/de T. R. Tramm Nuclear Licqnsing Administrator 1m cc: Byron Resident Inspector 9658N

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