05000316/LER-2075-069, Excessive Opening Torque of Ice Condenser Doors

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)

LER-2075-069, Excessive Opening Torque of Ice Condenser Doors

Event date:
Report date:
3162075069R00 - NRC Website

text

Iaaaaa vAa va aaaaaaVaaaaaaaa Vvvva4aaaalvv aaaava Vaa halva va ala NRC Dl B

I 0

0 KET TERlAL (TEMPORARY FORM)

ONTROL NO.13251 FILE INGIDENI'EPoRT Fl F ROM: Indiana 5 Michinga Power Bridgman, Michigan TO:

J.G.

Ke ler DATE OF DOC 11-17-75 ORIG None DATE REC'D 11-20-75 CC OTHER 29-LTR TWX RPT OTHER XXX SENT AEC PDR XXX SENT LOCALPDR XXX CLASS UNCLASS XXX PROP INFO INPUT NO CYS REC'D 29 DOCKET NO:

50-315

DESCRIPTION

Letter trans the following.......

EN C I.OSU R ES

. 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)

W/ Copies CLARK (L)

W/ Cooies PARR (0 W/ Copies yKNIEL(L)

WQCopies SCHWENCER (L)

W/ Copies STOLZ (L)

W/ Copies VASSALLO (L)

W/ Copies PURPLE (L)

'W/ Copies ZIEMANN(L)

W/ Copies DICKER (E)

W/ Cooies KNIGHTON {E)

W/ Copies YOUNGB LOOD (E)

W/ Copies REGAN (E)

W/ Copies LEAR (L)

W/ Copies SPELS iI,t'"

W/ Copies

'EID W/ Copies.

"gfQ~

INTERNALDISTRIBUTION G FIL TECH REVIEW t 'a.~NR R

~SCHROEDER OGC, ROOM P-506A

~IACCARY GOSSI CK/STAF F KNIGHT I',~CASE PAWLICK I SHAO BOYD

~~ STE LLO MOORE (L)

• -~HOUSTON DEYOUNG (L)

~~NOVAK SKOVHOLT (L)

~ROSS GOLLER {L) (Ltr)

IPPOLITO P. COLLINS WEDESCO DENISE J

COLLINS

'EG OPR LAINAS PI' B REGION GOQQ BENAROYA

.IGPC/PE (3)

~VOLLMER STEELE DENTON yG R I iVIES GAMMILL KASTNER BALLARD SPANGLER ENVIRO MUI LER DICKER KNIGHTON YOUNG8 LOOD REGAN PROJECT LDR HARLESS LIC ASST R. DIGGS (L)

H GEARIN {L)

E. GOULBOURNE (L)

P. KREUTZER (E)

J. LEE (L)

M. RUSHBROOK (L)

S. REED (E) gM. SERVICE {L)

S. SHEPPARD (L)

M. SLATER {E)

H. SMITH (L)

S. TEETS {L)

G. WILLIAMS(E)

V. WILSON (L)

R. INGRAM (I )

H DUNCAN A/T IND.

BRAITMAN SALTZMAN-MELTZ PLANS ',

MCDONALD CHAPMAN.

DUBE (Ltr)

E. COUP..E PETERSON HARTFIELD (2)

~ KLECKER EISENHVT

'WIGGINTOiil"-'

F. WILLIAMS

~ HA EXTERNAL DISTRIBUTION 1 LOCALPDR St.

Joseph, Michigan

~1 TIC (ABERNATHY)

(1)(2)(10) NATIONALLABS

~1 NSIC (BUCHANAN) 1 W. PENNINGTON, Rm E-201 GT 1 ASLB 1

CONSULTANTS 1 Newton Anderson NEWMARK/8LUME/AGBABIAN

~- ACRS sElZ To LIC;.SST M. Service SEND ONLY TEN DAY REPORTS 1-PDR-SAN/LA/NY 1 BROOKHAVEN NAT LAB 1 G. ULRIKSON, ORNL 1 AGMED (RUTH GUSSMAN)

Rm 8-127 GT 1 '. D. RUNKLES, Rm E-201 GT

i f,

f *"

"I'I f,

'k k

~ 3 I

~

~

~

~

I

~

4

>>yj.f I

t t g '

II

$ f),fQ 4

4

) f

($]lory 1

n

Hlectrla

~y~(~

PJDIAIN 8 NICHIGANPDIVER CONPANY DONALD C. COOK NUCLEAR PLANT P.O. Box 458, Bridgman, Michigan 40106 November 17, 1975

,Hr. J.G.

Keppler, Regional Director Office of Inspection and Enforcement United States Nuclear Regulatory Commission Region III

~08pl~Qteyy

'99 Roosevelt Road Glen Ellyn, IL 60137 6

goy SO~%@

3

~g)LY, u.s.

- eH go)l

<~'~$

18 cy 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 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 R.N. J en

, Plant na

/bab (OJ) IM-

':,O~~>i~g I

\\

P

~

CC'.S.

Hunter J.E.

Dolan" G.E. Lien R.J. Vollen BPI R. Kilburn R.C. Callen HPSC K.R. Baker RO: III P.l<. Steketee, Esq.

R. Malsh, Esq.

G. Charnoff, Esq.

G. Olson PNSRC R.S. Keith Director, IE (30 copies)

Director, HIPC (3 copies)

Wgo 4r

"'o

k

~

~

5

~

~

~

~

~

~

~

~ +

~

~ ~

~

~

~

~

~

~

~

~

Jog gg EH peg Q~B

~

L

~

~

~

~ ~

~

~ ~

se

~

~'

~

~

~

O'E EE HEl

~

~

lent L

l.

~

e4

~

~ ~ 1

~

~

~

~

~

~

~

~

~

~

~

~

~

~

~

~

~ ~

0

~

~

~

~

~

~

HE

~

~ ~

~

~

~ ~

I 1

~

I I'

SUPPLEMENT TO AO-50/315/75-69 SUPPLEMENT TO CAUSE DESCRIPTION, DATED 11/17/75 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

~

=

'pel lod 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.