ML20086D520

Telecopy Ro:Heating Steam Coil Leak in Reactor Bldg Ventilation Supply Unit V-AH-4A Resulted in Freezing of Condensate at Inlet to Unit & Subsequent Inoperability of Associated Secondary Containment Isolation Dampers

ML20086D520
Person / Time
Site:	Monticello, 05000000
Issue date:	12/14/1977
From:	Eliason L NORTHERN STATES POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19289B550	List: ML20086D481 ML20086D514 ML20086D520 ML20086D537 ML20086D550 ML20086D554 ML20086D557 ML20086D561 ML20086D567 ML20086D606 ML20086D642 ML20086D691 ML20086D703 ML20086D760 ML20086D788 ML20086D818 ML20086D823
References
NUDOCS 8312020194
Download: ML20086D520 (2)

Text

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) NORTHERN STATES POWER COMPANY

( Bbnticello Nuclear Generating Plant blanticello, &N 55362 l

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Dects:ber 14, 1977 Mr. J. G. Keppler, Director Region III Office of Inspection and Enforcecent Lktited States Nuclear Regulatory Cosmission 799 Roosevelt Road Glen Ellyn, IL 60137

Dear Mr. Keppler:

( FDSTICELID NUCLEAR ENEIMTING PLebT Dockot No. 50-263 License No. LVR-22 A heating steam coil leak in one of the reactor building ventilation supply units (V-MI-4A) resulted in freezing of condensato at the inlet to the unit and subsequent inoperability of the associated secondary containment isola- i tion dampers. The ico was thawed using a steam lanco, the stmm coil was repaired and the isointion darpers were returned to service. i

)

f Further investigation of this occurrence JS in prugress. q l '

} Yours very truly, j -

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L. R. Eliason '

Plant 6hnager .

l LRE/sdd i i w: Director, Office of Stanagement Infonnation and Program Contrul ,

j G. Charnoff i

( Minnesota Pollution Control Agency i Attn: J. W. Fernan

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i NORTHERN STATES POWER COMPANY I Bbnticello Nucicar Generating Plant  !

Abiticello,>N 55362  !

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l Decccher 14, 1977 i

1 Mr. J. G. Keppler, Director i

Region III Office of Inspection and Faforcecent thited States Nuclear Regulatory Comission 799 Roosevelt Road Glen Ellyn, IL 60137 1

Dear Mr. Keppler:

>DNFICELLO NUCLEAR ENEIMTING PIANT Docket No. 50-263 License No. DPR-22 A heating stea:n coil leak in cite of the reactor building ventilation supply 4 mits (V-Alf-4A) resulted in freezing of condensato at the inlet to the toit and subsequent inoperability of the associated secondary containment isola-

, tion dapers. ' Die ice was thawed using a steam lanco, tho steam coil was repaired and the isolation danpers were retunted to service.

Further investigation of this occurrence is in pmgress.

Yours very truly, '

.sL. w / u/ku R. Eliason Plant Mutager LRE/sdd cc: Director, Office of Management Infonnation and Program Control G. Charnoff Minnesota Pollution Control Agency j

Attn: J. W. Fennan 4

File

-0 Copy sent by telecopier to Keppler. 7*

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