ML17317A985

LER 79-006/03L-0 on 790208:pressurizer Relief Tank Diaphragm Ruptured,Causing Ice Condenser Inlet Doors to Be Indicated Open.Caused by Pressure Surge in Lower Containment.Unit Shut Down & Doors Closed

ML17317A985
Person / Time
Site:	Cook
Issue date:	03/07/1979
From:	Chadwell H INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17317A983	List: ML17317A982 ML17317A984 ML17317A985
References
LER-79-006-03L-01, LER-79-6-3L-1, NUDOCS 7903130368
Download: ML17317A985 (4)

Text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION

{7 'I7)

LICENSEE EVENT REPORT CONTROL BLOCK: Q1 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

~ol M I D C C 1 14 Q2 15 0 0 0 0 0 0 0 LICENSE NUMBER 0 0 0 0 25 Q24 26 1 1 LICENSE TYPE 1 1 30 QE~QE 57 CAT 58 7 8 9 LICENSEE CODE CON'T 0 1 8

soURGE MO 60 61 0 5 0 0 0 DOCKET NUMBER 3 1 5 68 0 69 0 2 0 EVENT DATE 8 7 9 74 QB 75 0 3 o 7 REPORT DATE 7 9 80 Q

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Q10

~O P R TI G AT 100 PCT POWER THE PRESSURIZER RELIEF TANK DIAPHRAGM WAS RUPTURED

~O3 WHEN ADDING PRIMARY WATER TO THE TANK. THIS CAUSED THE ICE CONDENSER INLET DOORS

~O4 TO BE INDICATED OPEN, CONTRARY TO T.S. 3.6.5.3. A FORCED SHUTDOWN OF THE UNIT WAS NECESSARY IN ORDER TO ENTER THE CONTAINMENT AND CLOSE THE DOORS. THE RAPID POWER

~os

~OB REDUCTION CAUSED THE AXIAL FLUX DIFFERENCE TO BE DRIVEN OUTSIDE THE TARGET BAND SPECIFIED IN T.S. 3.2.1 ~ THE AFD WASROUTSIDE THE BAND FOR 2 MINUTES ABOVE 75 PCT ADDITIONAL TEN MINUTES WHILE BETWEEN 50 PCT CONTINUED PAGE 2

~OB POWER AND FOR AN 80

'>>Q4 7 8 9 SYSTEM CAUSE CAUSE COMP. VAI.VE CODE CODE SUBCODE COMPONEI4TCODE SUBCODE SUBCODE 8 '9

~ZZ 10 Q>>

11 X QEE P

~>O>>

12 13 Z

18

~~QEE 19 LZJQE' 20 SEQUENTIAL OCCURRENCE REPORT i REVISION Q

LERiRP REPORT EVENT YEAR

~yg 21 22

~23

~00 24 REPORT NO.

6 26

~W 27

. ~03 28 CODE 29 TYPE 30, 31 NO.

32 ACTION FUTURE TAKEN ACTION LuQ1BLIQ>>

33 34 EFFECT ON PLANT

~Q20 35 SHUTDOWN METHOD LHQ21 36 37 HOURS +22 40 ATTACHMENT SUBMITTED UYQ23 41 NPRDR FORM SUB.

uNQ2" 42 PRIME COMP.

DQ '

SUPPLIER 43 44 COMPONENT MANUFACTURER 47 Q26 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 o THE PRESSURE SURGE IN THE LOWER CONTAINMENT CREATED BY THE RUPTURE OF THE PRT DIAPHRAGM CAUSED THE ICE CONDENSER DOORS TO INDICATE OPEN. THE UNIT WAS REMOVED FROM SERVICE AND ANY DOORS fOUND TO BE OPEN WERE CLOSED AFTER 4.5 HOURS. THE POWER REDUCTION FROM 100 PCT TO 50 PCT WAS MADE OVER A PERIOD OF 1 5 MINUTES AND WAS 3

ACCOMPLISHED ALMOST ENTIRELY BY CONTROL ROD INSERTION (CONTINUED PAGE 2) 80 7

~l5 8 9 FACILITY STATUS F Q25 ~l0

% POWER 0 Q29 OTHERSTATUS NA

~

~3P METHOD OF DISCOVERY uAQ31 DISCOVERY DESCRIPTION OPERATOR OBSERVATION 8 9 10 12 13 44 45 46 80 7 i ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE EK LJQ LJO 7 8 9 10 11 44 45 NA 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION Q39 LILLILLo JQ>>~zQEE NA

' I 13 80 7 8 9 12 PERSONNEL INJURIES B

NUMBER LILLt)JgJQo OESCRIPTIONQ41 NA 7 eely iaz7 SL 80 7 8 9 11 12 LOSS OF OR DAMAGE TO FACILITY 43 TYPE DESCRIPTION 5 z Q42 NA 8 9 10 80

~2 ~

ISSUED MQ44 PUBLICITY DESCRIPTION ~ NRC USE ONLY 52 44 ER 7, 8 9 10 68 69 (616) 465-5901 EXT-316 80 ~ ER NAME OF PREPARER H. M. CHADWELL .

t CONTINUATION OF LER ¹79-006/03L-0 PAGE 2 EVENT DESCRIPTION AND PROBABLE CONSE UENCES:

AND 75 PCT POWER. PREVIOUS EVENTS 78-013/03L-0 AND 78-089/03L-O.

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS:

THE ROD.INSERTION CAUSED THE AFD TO LEAVE.THE TARGET BAND BEFORE THE 50 PCT POWER LEVEL WAS REACHED. NO FURTHER ACTION IS PLANNED.

I