ML20058L540
| ML20058L540 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 12/21/1977 |
| From: | Iverson O, Mayer L NORTHERN STATES POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| LER-LER-771221, NUDOCS 9105230313 | |
| Download: ML20058L540 (2) | |
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1 NORTHERN STATES kP.O-W E R' COMPANY M t N N E A PO LI S. M t N N E S OTA 3540s December 21, 1977
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Mr J G Keppler, Director, Region III
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J Office of Inspection & Enforcem nt U S Nuclear Regulatory Cor.nissis,n 799 Roosevelt Road
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Glen Ellyn, IL 60137 2r
Dear Mr Keppler:
MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 Secondarv Contaircent Isolation Damer - Inoperable The Licensee Event Report for this occurrence is reproduced en the back of this letter.
Enc'ased are three copies.
Yours very truly, I
lMt p
L 0 Mayer, PE Manager af Nuclear Support Se rvi c e s LOM/IM /deh cc: Director, IE, USNRC (40)
Director, MIPC, USNRC (3)
G Charnoff MPCA Attn:
J W Ferman 9105230313 771221 CF ADOCK 05000263 CF cver
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[PLEASE FRINT LL REQU8AED INFORMAff0N) 1 6
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?4 75 EVE N T DE SCA PTON bJ lDuring normal operation, D
seconda ry containment isolation dampers associated with l
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were found blocked 17 the open position l 7
@9lby ice.
Condensate leaking from reputured steam coil froze in presence of sub-zero l 80 7 8
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No previous reportable occurrence.
bD Ice was tnawed using steam lance. l 7 89 g l Coil was repaired and isolation dampers were returned to service 6J os (M-RO-77-34) l
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4e CAUSE DESCAIPTION
@ } Corrosion of preheat coil's inner steart-distribution tube resulted in the 7 89 stagna-l
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Replacement coils on order.
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