ML17326A685

Updated LER 80-004/03X-1:on 800311,while Performing Scan Sequence, One of Two Detectors in Use for Axial Power Distribution Monitoring Sys Became Inoperable.Caused by Stretched Helex in Detector & Damaged Drive Wheel

ML17326A685
Person / Time
Site:	Cook
Issue date:	04/30/1980
From:	Delong S INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17318A723	List: ML17318A722 ML17326A685
References
LER-80-004-03X, LER-80-4-3X, NUDOCS 8005050272
Download: ML17326A685 (4)

Text

NRC FORM 366 U. S. NUCLEAR REGUI.ATORY COMMISSION t7.77) ~ UPDATE REPORT PR 'OUS REPORT DATE CENSEE EVENT REPORT 04-08-80

~ CONTROL B LOCK: Q1 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 6

~s~

7 8 9 M I D LICENSEE CODE C C I 14 Qs 15 0 0 0 0 0 0 0 LICENSE NUMBER 0 0 0 0 25 Qs 26 4 1 1 LICENSE TYPE 1 1 30 Q4~ 57 CAT 58 Qs CON'T

~o1 """ ~LQB 0 5 0 0 0 3 1 5 Q7 0 3 1 1 8 0 Qs0 4 3 0 8 0 Q 7 8 60 61 DOCKET NUMBEII 68 69 EVENT DATE 74 75 REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Q10

~o2 WHILE PERFORMING A SCAN SEQUENCE ONE OF THE TWO DETECTORS IN USE FOR APDMS BECAME INOPERABLE AND COULD NOT COMPLETE ITS SCAN. ALL OTHER DETECTORS WERE

~o3 4 UNAVAILABLE FOR USE AND THEREFOREt T~S.4. 2. 6. 2, REQUIRING AT LEAST 2 THIMBLES h

BE USED TO MONITOR F . (Z), COULD NOT BE MET.

OF A SIMILAR NATURE INCLUDE: 050-31 5/79-49 050-31 6/79-25,

~os PREV IOUS OCCURRENCES

~O7

~OS 80 7 8 9 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

~OB ~ID Q]\ E Qu ~8Qss I N S T R U Q4 ~EQs 19

~1 20 Qss 7 8 9 10 11 12 13 18 SEQUENTIAL OCCURRENCE REPORT REVISION 21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRDP PRIME COMP. COMPONENT TAKEN ACTION ON PLANT MET)4OD I)OUR/ i+22 SUBA)iTTED FORM SUB. SUPPLIER MANUFACTURER

~AQ~~Q]9 ~Qss ~Q2l ~Qss ~Q24 ~~Qss N 1 2 0 Qss 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 A REEVALUATION OF THIS EVENT HAS REVEALED THAT THE INITIATING CAUSE WAS THE FAILURE p

OF ONE OF THE TWO DETECTORS IN USE FOR THE QPDMS SYSTEM. THE FAILURE WAS DUE TO THE DETECTOR DEVELOPING A STRETCHED HELEX AND SUBSEQUENTLY A DAMAGED DRIVE WHEEL.

AT THE TIME OF THIS EVENT ALL OTHER DETECTORS IN THE FLUX MAPPING SYSTEM WERE 4 UNAVAILABLETHUS MAKING THE APDMS (SEE ATTACHED SUPPLEMENT 7 8 9 80 FACILITY STATUS 88 POWER 0 0 OTHER STATUS NA Q METHOD OF DISCOVERY OPERATOR OBSERVATION DISCOVERY DESCRIPTION Q2 E 2s 1 ~AQ31 7 8 9 10 12 13 44 45 46 80 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITYQ3 LOCATION OF REI.EASE Q 7

6 8

~Z 9

Q ~ZQ34 10 11 NA 44 45 NA 80 PERSONNEL EXPOSURES I NUMBER TYPE DESCRIPTION Q39

~l7 8 ~00 0 Q37 Z Qss 13 NA 80 7 9 11 12 PERSONNEL INJURIES 7 8 9 11 12 80 LOSS OF OR DAMAGE TO FACILITY 7 8 TYPE 9

Z Q4.

DESCRIPTION 10 Q43 NA oo 5oSo ~<< 80 PUBI.ICITY ISSUED DESCRIPTION Q NRC USE ONLY

~NQ<< NA 7 8 9 10 68 69 80 o S. D. DeLong 616-465-5901 0 L

NAME OF PREPARER PHONE'

I 0

'E

A'KTACHMENT TO LER

¹80-'004/03X-1'UPPLEMENT TO CAUSE DESCRIPTION AND ALTERNATE P250 COMPUTER SYSTEMS UNAVAILABLE FOR USE.

WHEN IT WAS DETERMINED THAT THE REQUIRED SCANS COULD NOT BE COMPLETED REACTOR POWER WAS REDUCED TO 83 PER CENT IN COMPLIANCE WITH THE ACTION REQUIREMENTS, OF T.S. 3.2.6.

II THE DAMAGED DETECTOR AND DRIVE WHEEL WERE REPLACED AND-RETURNED, TO SERVICE. NO FURTHER ACTION IS PLANNED AT THIS TIME.

INCORE FLUX PROBE WAS A WESTINGHOUSE MODEL NO. WL-23630.

THE DRIVE 'WHEEL WAS A TELEFLEX PART NO. 25495.

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