ML17317A736

Reports on Investigation of Isolation of Deluge Valves to Drumming Room & New Fuel Receiving Area:Closing Valves Was Necessary to Prevent Spurious Oper of Sprinkler Sys During Repairs to Broken Fire Header Outside Bldg from 781027-31

ML17317A736
Person / Time
Site:	Cook
Issue date:	11/09/1978
From:	Shaller D INDIANA MICHIGAN POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
FP-01, FP-1, NUDOCS 7811170204
Download: ML17317A736 (3)

Text

REGULATOR~ XN FORMATION DISTRXBUTXON YSTEM DOCKET NBR: 50-315 1 COO DOC DATE: 781109 RECIPIENT: KEPPLE .G. ACCESSION NBRP811170204 ORIGINATOR. SHALLER,D.V. COPIES RECEIVED-COMPANy NAME IN 6 MI PWR LTR ENCL

SUBJECT:

SIZE:

Re orts on investi ation of isolat' new fuel receivin area: to e~~~us o er of s rinkler s s durin re airs to broken fire header outd'de b 'd from 781027-31.

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DONALD C. COOK NUCLEAR PLANT P.O. Box 458, Bridgman, Nichi'gan 49106 November 9, 1978 Mr. J.G. Keppler, Regional Director Office of Inspection and Enforcement United States Nuclear Regulatory Corrmission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 Operating License DPR-58/DPR-74 Docket No. 50-315/50-316 Special Report FP-01

Dear Mr. Keppler:

On October 30, 1978, we informed NRC Region III verbally and in writing that due to a repair on our Fire System headers it became necessary to isolate the deluge valves to the Plant's Drumming Room and New Fuel Receiving Area. Our investigation into this event is complete and this report is being submitted as required by 'Appendix A, Techni cal Specifi-cation 6.9.2.

Between the hours of 1230 October 27, 1978, and 1230 October 31, 1978, it was necessary to close the hand isolation valves to the automatic sprinkler systems protecting the Auxiliary Building Cask Handling Area and the Auxiliary Building Drumming Area. Technical Specification 3.7.9.1b.

requires that a flow path be available to the first valve ahead of the flow alarm device on these systems at all times.

Closing these valves was necessary to prevent, spurious operation of these systems during repairs to a broken fire header outside the building. A one-inch pressure sensing line which is used to hold the deluge valve latched in place is connected to that section of header which was isolated and drained to make the repair.

A backup fire suppression system was available at all times from the Auxiliary Building 1>" fi re hose stations, four in the cask receiving

,area and one in the drumming area. The sprinkler systems could have been used in case of fire by merely opening the hand isolation valves. The plant fire truck was also available and could be used in one of these areas if needed. The fire detection alarm system was operable in these areas at all times.

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N . J.G. Kepp 1 er mber 9, 19";3 Page to the broken line were completed in four days 2'epairs and the systems returned to operable status immediately thereafter.

Sincerely, D.V. Shaller Plant Manager

/bab cc: J.E. Dolan R.M. Jurgensen R.F. Kroeger R. Kilburn R.J. Vollen BPI K.R. Baker RO:III R.C. Callen NPSC .

P.M. Steketee, Esq.

R. Malsh, Esq.

G. Charnoff, Esq.

J.N. Hennigan G. 01son PNSRC J.F. Stietzel Dir., IE (20 copies)

Dir., NIPC (2 copies)