ML18219C387

LER-1975-069-00 for Donald C. Cook, Unit 1 - Excessive Opening Torque of Ice Condenser Doors

ML18219C387
Person / Time
Site:	Cook
Issue date:	11/17/1975
From:	Jurgensen R American Electric Power Service Corp, Indiana Michigan Power Co, (Formerly Indiana & Michigan Power Co)
To:	James Keppler NRC/IE, NRC/RGN-III
References
LER-1975-069-00
Download: ML18219C387 (7)

Text

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ONTROL NO.13251 FILE INGIDENI'EPoRT Fl F ROM: Indiana 5 Mi chinga Power DATE OF DOC DATE REC'D LTR TWX RPT OTHER Bridgman, Michigan 11-17-75 11-20-75 XXX TO: ORIG CC OTHER SENT AEC PDR XXX XXX J.G. Ke ler None 29- SENT LOCAL PDR CLASS UNC LASS PROP INFO INPUT NO CYS REC'D DOCKET NO:

XXX 29 50-315 DESCRIPTION: EN C I.OSU R ES Letter trans the following....... . Licensee E'vent Report ¹ 75-'69, on 10-3-75, Concerning the torque ice exceeding its, Tech: Specs...:...

(1 Copy Received)'LANT NAME: Cook ¹ 1 FOR ACTION/INFORMATION SAB 11-21-75 BUTLER (L) SCHWENCER (L) ZIEMANN (L) REGAN (E)

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~y~(~ PJDIA IN 8 NICHIGANPD IVER CONPAN Y DONALD C. COOK NUCLEAR PLANT P.O. Box 458, Bridgman, Michigan 40106 November 17, 1975 6 SO~%@ 3 goy ~g)LY, u.s. "

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,Hr. J.G. Keppler, Regional Director Office of Inspection and Enforcement <~'~$

United States Nuclear Regulatory Commission Region III , ~08pl~Qteyy

'99 Roosevelt Road 18 cy Glen Ellyn, IL 60137 Operating License DPR-58 Docket No; 50-315

Dear Hr. Keppler:

Pursuant to the requirements of Aopendix A Technical Specifications and the United States Nuclear Regulatory Commission Regulatory Guide 1.16, Revision 3, Section 2.b, the following Abnormal Occurrence Report is

=submitted:

AO 50-315/75-69

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This Licensee Event Report was originally due to be submitted on November 3, 1975. On November 3, '1975, Hr. D.V. Shaller contacted NRC RO: III Resident Inspection Hr. K.R. Baker and was granted a two week extension in submitting this report.

Sincerely, ~

C (OJ) IM-R.N. J en

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SUPPLEMENT TO AO-50/315/75-69 DATED 11/17/75 SUPPLEMENT TO CAUSE DESCRIPTION, Initially upon finding the condition, the doors were manually opened and the ice buildup was removed. The opening torque was rechecked and all doors met the Technical Specification limit.

Subsequently, during a plant outage from October 12, 1975, through October 14, 1975, the problem of ice buildup at the bottom seal-door inter-face was investigated by Indiana 5 Michigan Power Company, American Electric Power Service Corporation and Westinghouse personnel.

It was determined that the ice is being formed from condensation. Con-

'ensation was found occurring outside the door at the bottom door frame surface in twenty of the twenty-four bays. The condensation is created from humidity in the lower containment volume warm air, which comes in contact with the cold

'.metal door frame surface, thereby cooling the air below the dew point.

',The cause has been postulated to be:

'I. Insulation under the door frame had frozen due'o water inseepage, thereby losing 'insulation qualities and in ten cases causing an ice bridge between the insulation and lower inlet door. The insulation became soaked with moisture and then froze. We believe this problem was accentuated during the summer months due to higher lake water temperature resulting in a higher containment ambient temperature.

2. Metal angle of the door frame.was operating at a "colder temperature thereby allowing condensation buildup.

- " .' . 3. . Lower ice condenser and'floor temperature during this operating

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Corrections to the above si tuati ons are:

1. The floor cooling system valve YRV-20 has been adjusted to raise the

. floor temperature to approximately +15oF.

-, 2. Insulation has been replaced and caulking added to prevent water inleakage.

It was also observed that by placing insulating material on the lower inlet door metal frame strip that the condensation was retarded.

~ ', On November 1, 1975, all lower inlet doors were inspected with the Unit in Mode 2. All doors were found to open freely, but condensation was observed on most of the door seals with some minor ice buildup noted on a few of the doors.

The rubber insulating strips are presently being added to all the lower inlet door metal frames and a program of periodic inspections of the lower inlet doors with respect to ice accumulation and opening force has been initiated.

SUPPLEMENT TO OFFSITE CONSE(UENCES The remaining ten dobrs could still be opened.