05000315/LER-1979-031-03, /03L-0 on 790419:during Routine Channel Calibr, Bistable Trip Value Discovered Nonconservative W/Respect to Tech Spec Limits.Caused by Excess Drift.Bistable Will Be Repaired

/03L-0 on 790419:during Routine Channel Calibr, Bistable Trip Value Discovered Nonconservative W/Respect to Tech Spec Limits.Caused by Excess Drift.Bistable Will Be Repaired

ML17317B211
Person / Time
Site:	Cook
Issue date:	05/16/1979
From:	Beilman T INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17317B209	List: 05000315/LER-1979-030-03, /03L-0 on 790417:while Performing Routine Surveillance Test on AB Diesel Generator,Load Conservation Circuitry Did Not Fully Function as Design.Cause Under Investigation 05000315/LER-1979-031-03, /03L-0 on 790419:during Routine Channel Calibr, Bistable Trip Value Discovered Nonconservative W/Respect to Tech Spec Limits.Caused by Excess Drift.Bistable Will Be Repaired 05000315/LER-1979-032-03, /03L-0 on 790416:during Routine Channel Calibr, Bistable FB-510B Trip Point Was Nonconservative W/Respect to Tech Spec Limit.Caused by Excess Drift.Bistable Recalibr ML17317B208
References
LER-79-031-03L, LER-79-31-3L, NUDOCS 7905220333
Download: ML17317B211 (1)

LER-1979-031, /03L-0 on 790419:during Routine Channel Calibr, Bistable Trip Value Discovered Nonconservative W/Respect to Tech Spec Limits.Caused by Excess Drift.Bistable Will Be Repaired

Event date:
Report date:
3151979031R03 - NRC Website

text

s NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION (7-77)

'v LICENSEE EVENT REPORT CONTROL BLOCK:

(PLEASE PRINT OR TYPE ALLREQUIRED INFORMATION)

I 6

~oi M

I 0

C C

1Qg 0

0 0

0 0

ll 0

0 0

0 OQ 4

1 1

1 1 Q4~Qs 7

8 9

LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 CON'T

~o>

"ssog

~L~g 0

5 0

0 0

3 I

5 Qr 0

4 1

9 7

9 Qs 0

5 I 6

7 9

Qg SOURCE 7

8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Q10 DURING A ROUTINE CHANNEL CALIBRATION OF OVERPOIIER DELTA-TEMPERATURE BISTABLE TB-421G, IT WAS DISCOVERED THAT THE BISTABLE TRIP VALUE WAS NON-.CONSERVATIVE WITH RESPECT TO THE LIMIT IMPOSED BY T.S.

TABLE 2.2-1 ITEM B.

~07

~os 7

8 9

80

~O9 7

8 THE BISTABLE WAS RECALIBRATED AND OPERATION WAS MONITOREO WITH UNSATISFACTORY SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

~IA Ql

~EQu

~GQn I

N S

T R

U Ql4

~SS

~2Qs 9

10 11 12 13 18 19 20 SEOUENTIAL OCCURRENCE REPORT REVISION LERIRP EVENTYEAR REPORT NO.

CODE TYPE g NO.

Q os's'79

+

~og y

Qw

~03

+L Q

QO 21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRDP PRIME COMP.

COMPONENT TAKEN ACTION ON PLANT METHOD HOURS Q22 SUBMITTED FORM SUB.

SUPPLIER MANUFACTURER I

IQls ~CQig

~ZQgo U>Q 0

0 0

0

+(I Qgs

~NQgs

~NQgs W

1 2

0 Qgs 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 o

THE CAUSE OF THE NON CONSERVATIVE TRIP POINT HAS BEEN ATTRIBUTED TO EXCESSIVE DRIFT RESULTS.

THE BISTABLE WILL BE REPAIRED AND RESTORED TO OPERABLE STATUS PRIOR TO UNI'T OPERATION IN THE. MODE IN WHICH OPERABILITY IS REQUIRED BY T.S.

4 7

8 9

FACILITY

STATUS, 95 POWER OTHER STATUS QBD 5

H 2B O

O O

29 NA Cq LJQ ~Q ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITYQ 6

~Z Q33

~ZQ34 NA 7

8 9

10 11 44 PERSONNEL EXPOSURES 7

8 9

11 12 13 PERSONNEL INJURIES NUMBER DESCRIPTIONQ41 s '~00 0

Qgo NA METHOD OF DISCOVERY DISCOVERY DESCRIPTION Q32 Q31 ROUTINE TEST 45 LOCATIONOF RELEASE Q 45 80 80'0 80 7

8 7

8 o

7 8

NAME OF PREPARER T.

P.

Bellman 9

11 12 LOSS OF OR DAMAGETO FACILITYQ43

'YZ'Q42 """'"""

NA 9

10 PUBLICITY ISSUED DESCRIPTION~

NA 9

10 80 68 69 616-465-5901 80 NRC USE ONI Y gs sg r

80 g 0