ML18219C337

LER 1976-030-00 Re Ice Build Up at the Bottom of 2 Lower Inlet Door, Bay 3 Right Hand Door & Bay 5 Left Door

ML18219C337
Person / Time
Site:	Cook
Issue date:	08/04/1976
From:	Jurgensen R Indiana Michigan Power Co
To:	James Keppler NRC/RGN-III
References
LER 1976-030-00
Download: ML18219C337 (7)

Text

NIIC roti"~OB U.S. NUCLIIAB fILOULATOIIVCOM IION DOCKI T NUMOF f1 n Tiff 50-315 I'ILE NUM IIEf1 NRC DISTRIBUTION rou PART 50 DOCKET MATERIAL XNCXDI"NT Hl"I'OHT FROM: DATE OF DOCUMENT Indiana & Michigan Power 8/4/76 Mr. J. G. Keppler Michigan Co.'ridgman, DATL BECEIVrD R. W. Jurgensen 8/9/76 QLETTEB QNOTOBIZED PBOP INf'UT FOBM NUMDEB OF COPIES BECL'IVED QOBIGINAL QUNC LASS IF I E D QCOP V One signed copy DESCBIPTION ENCLOSU BE Ltr. trans the following: Licensee Event Report (RO 50-315/76-30) on 7/5/76 concerning an ice buildup at the bottom of 2 lower inlet doors while in mode 5, during ice condenser inlet door opening surveillance ACZNOWLZDGEQ~ testing,

'D,O NOT EIgNOVE (2-P)

PLANT NAME; NOTE: IF PERSONNEL EXPOSURE IS INVOLVED SEND DIRECTLY TO KREGER/J..COLLINS Cook gl FOR ACTION/INFORMATION BRANCH CHIEF; Ziemann W CYS FOR ACTXON Di s ACHS CYS HOLDING SE INTERNAL D IST Rl BUTION r FILE NRC PDH MIPC SCEIROEDER IPPOLITO EIOUS ION NOVAK CHECK GRIMES CASE TEDESCO IIACCAHY EISENHUT BAER SEEAO VOLLMER BUNCEE KHEGEH J. COLLINS EXTERNAL DISTRIBUTION CONTROL NUMBER LPDH: St. Jose h M TXC'ing o

NBC FABM 196 19.7III

I l

~ ~

I I

- II R (( t "l

~RR0 rjJg Qy

"'o

~merlccn

/Llactr4a lillDlAIIM8 MICHIGANPGNlEH CGAlp~y DONALD C. COOK NUCLEAR PLANT p.O. Box 458, Bridgman, Michigan 49106 Piigc August 4, 1976

~'g I'";lrr Mr. J.G. Keppler, Regional Director /

Office of Inspection and Enforcement United States Nuclear Regulatory Commission Region III S r I 799 Roosevelt Road Glen Ellyn, IL 60137 Operating License DPR-58 Docket No. 50-315

Dear Mr. Keppler:

Pursuant to the requirements'f Appendix A Technical Specifications and the United States Nuclear Regulatory Commission Regulatory Guide 1.16, Revision 4, Section 2.b, the following report is submitted:

RO 50-315/?6-30.

Sincerely,

~~ R.M. Jurgensen Plant Manager

/bab cc: R.S. Hunter J.E. Dolan G.E. Lien R. Kilburn, R.J. Yollen BPI R.C. Callen MPSC K.R. Baker RO: III P.W. Sceketee, Esq.

R. llalsh, Esq.

G. Charnoff, Esq.

G. Olson J.M. Hennigan PNSRC R.S. Keith Dir., IE (30 copies)

Dir., MIPC {3 copies)

~;

a', II 4

N f /, !f

- V p', I.,

e "h,

'p;t/l i h

REPORT ii CONTROL BLOCK: (PLEASE PBIIIIT ALL AEOLIIRKO IHFOA'MATIOt9)

>> 'l

~

UCENSEE UCENSE EVEi~iT T

t4hiMi LIC NSE NU!i GER TYPE TYPE goi] N' 0 C C 1 0 0 0 0 0 0 0 0 0

~

7 89 14 I5 25 28 30 31 REPORT REPORT REPORT DATE CATEGORY OOCIIET NUMSER EVEi4T'ATE

[oa~) co; ~L ~L 0 5 0 0 0 8 0 4 7 6 57 58 59 60 68 89 8O 7 8 i

EVENT DESCRIPTION Q~g MHILE IN NODE 5 DURING ICE CONDENSER INLET DOOR OPENING TOR UE.SURVEILLANCE TESTING I 80 7 8 9 03 CG

'AS FOUND THAT THERE HAS AN ICE BUILDUP AT THE BOTTOM OF 2 LOl jER INLET DOORS, BAY '3 80 Qp~] RIGHT HAND DOOR AND BAY 5 lEFT DOOR. THIS CONDITION CAUSED THE INITIAL OPENING FORCE TO 7 8 9 80 Jog BE IN EXCESS OF TECHNICAL SPECIFICATIONS PARAGRAPH 4.6.5.3.1.b 1 and 2.

80

• (R0-50-315 76-30 7 8 9 PFIME SYSTE!A CAUSE COIIIFOI4B4T COMPONENT

~a~~slB 7 8 9 10 CODE CODE F

11 12 xxxxx COMPOi4ENT CODE I7 SUr PUER

~N, 43 M

IVANUraCTURBI 1 2 0 47 =

VNILAllOi4 48 CAUSE DESCRlPTION Q~g SEE SUPPLEMENT.

7 89 80

~os 7 8 9 89 7

FACILITY

'4 '

POVVER OTHER STATUS METHOD OF, DISCOVERY ~

' 'SCOVEAY OESCRPTIOiM

'o

'T'TUS Q~g ~G ~00 0 NA aS'8 ..

B SURVEILLANCE TESTING 7 8' 'l2 'ls 80 FOR!iI OF ACTIVITY CONTENT OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE REI.EASED

~Z ~Z..NA NA 7 8 . 9 10 44 45 i PERSONNEL EXPOSURES i NUMBER =TYPE 'ESCRPTIOi4 Qtg ~00 0 Z, NA 7 8 9 11 12,13 80 PERSONNEL Pi1JURIES NU!.13ER DESCRIPTION

~00 0 LNA 7 89 1'l 12 PROBABLTE CONSEQUENCES

~15 NA 7 89 LOSS OR DAMAGE TO FACIL'ITY TYP" OESCA>PTIOI4 7 a 9 1ip PUBLICITY NA 7 89 ADDITIONAL FACTORS Q~ 8 ,SEE SUPPLEt'1ENT

? 8 9

~19, 1 7 89 NAivii I3 L RI SCHL ING PHON . 616)465-5901(368)

~ ~

SUPPLEMENT TO REPORTABLE OCCURRENCE RO 50-315/76-30 SUPPLEMENT TO CAUSE DESCRIPTION On the Bay 3 right door, the ice accumulation was removed and the door surface cleaned. The door seal was replaced with an improved design which in the past has proven very effective in reducing air leakage, which in turn reduces the amount of condensation and resultant ice buildup.

During an outage in April, 1976, the original door seal on the Bay 5 left door was replaced with an experimental prototype seal utilizing two sealing lips. The inspection during the July, 1976, outage indicated that the air pocket between the seal lips tends to form a nearly static

air pocket which increases the ice formation from air leakage into this air pocket volume. The ice accumulation was removed from both the seal and door frame and the seal-to-door contacting surface was cleaned. To prevent this problem.fnom reoccuring, the lower seal retainer was adjusted to permit improved seal contact in the areas of icing.-

ADDITIONAL FACTORS A

Technical Specification 4.6.5.3.1.b inspections for the first year of operation have been completed and the 18 month interval now applies. However, as a result of finding ice buildup on the doors, this inspection will be conducted again during or before the next refueling outage which is currently planned for late 1976. ,