05000316/LER-1979-032-03, /03L-0:on 790911,during Surveillance Test,High Pressure Reactor Trip Bistable Found to Trip at Setpoint Corresponding to 2417 Psig.Caused by Defective Bistable. Bistable Replaced

/03L-0:on 790911,during Surveillance Test,High Pressure Reactor Trip Bistable Found to Trip at Setpoint Corresponding to 2417 Psig.Caused by Defective Bistable. Bistable Replaced

ML17326A284
Person / Time
Site:	Cook
Issue date:	10/10/1979
From:	Rischling J INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17326A281	List: 05000316/LER-1979-031-03, /03L-0:on 790912,elevation Containmment Airlock Interlock at 612 Ft Did Not Prevent Opening of Outer Door W/Inner Door Open.Caused by Flexing of One Interlock Support Bracket.Gusset Added to Bracket 05000316/LER-1979-032-03, /03L-0:on 790911,during Surveillance Test,High Pressure Reactor Trip Bistable Found to Trip at Setpoint Corresponding to 2417 Psig.Caused by Defective Bistable. Bistable Replaced ML17326A280
References
LER-79-032-03L-01, LER-79-32-3L-1, NUDOCS 7910160511
Download: ML17326A284 (4)

LER-1979-032, /03L-0:on 790911,during Surveillance Test,High Pressure Reactor Trip Bistable Found to Trip at Setpoint Corresponding to 2417 Psig.Caused by Defective Bistable. Bistable Replaced

Event date:
Report date:
3161979032R03 - NRC Website

text

U. S. NUCLEAR REGULATORY COMMISSION [CENSEE EVENT REPORT Qi (PLEASE PRINT OR TYPE ALLREQUIRED INFORMATION) 6 0

0 0

0 0

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1 1

1 IQE~Q LICENSE NUMBER

'25 26 LICENSE TYPE 30 57 CAT 58 NRC FORM 366 (7.77)

A CONTROL BLOCK:

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0 7 9Q SOURCE 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES 010 DURING A SURVEILLANCE TEST ON PRESSURIZER PRESSURE-PROTECTION SET I,

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'THE HIGH PRESSURE REACTOR TRIP BISTABLE WAS FOUND TO TRIP AT A SET-POINT CORRESPONDING TO 2417 PSIG.

THIS EXCEEDED THE REACTOR TRIP VALUE SPECIFIED IN T.S.

TABLE 2.2-1.

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SYSTEM

CAUSE

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VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

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N S

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0 QE USS LHS 9

10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION LERIRO EVENT YEAR REPORT NO.

CODE TYPE 5 NO.

Q11 REPoRT

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

COMPONENT TAKEN ACTION ON PLANT METHOD HOURS +22 SUBMITTED FORM SUB.

SUPPLIER MANUFACTURER QIB ~Z Q19

~Z Q20 QJ Q21 PJ Q23 ~ Q24

~A Q26 Q26 33 34 '5 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 p

ON SEPTEMBER 1 1 I THE BISTABLE WAS ADJUSTED TO WITHIN ALLOWABLE VALUES AND RETURNED TO OPERATION.

ON SEPTEMBER 18, A RECHECK OF THE BISTABLE TRIP VALUE INDICATED THAT THE BISTABLE HAD AGAIN DRIFTED, THIS TIME 3

IN A CONSERVATIVE DIRECTION.

THIS BISTABLE WAS DETERMINED TO BE 4

INOPERABLE AND THE ACTION REQUIREMENT

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SEE SUPPLEMENT) 7 8

9 FACILITY STATUS 9IPPOWER OTHER STATUS Q 5

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10 12 13 44 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITY 6

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'0 11 44 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION Q39

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9 11 12 13 PERSONNEL INJURIES METHOD OF DISCOVERY DISCOVERY DESCRIPTION Q32

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'6 LOCATIONOF RELEASE Q 45 80 80 80 80 7

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9 11 12 LOSS OF OR DAMAGETO FACILITY 43 TYPE

DESCRIPTION

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10 PUBLICITY ISSUED DESCRIPTION~

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10 NAME OF PREPARER J. L. Rischling NRC USE ONLY 68 69 616-465-5901 PHONE:

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SUPPLEMENT TO LER 879-032 03L-0 SUPPLEMENT TO CAUSE DESCRIPTION OF T.S.

TABLE 3.3-1 ITEM 10 WAS MET.

THE DEFECTIVE BISTABLE, MANUFACTURED BY FOXBORO-MODEL NUMBER 63U-AC-OHBA-F, WAS RE-PLACED.

THE NEW BISTABLE WAS CALIBRATED AND SET TO TRIP AT THE PROPER VALUE.

A RECHECK OF THE NEW BISTABLE TRIP SETPOINT ON SEPTEMBER 20, INDICATED THAT THIS BISTABLE WAS FUNCTIONING PROPERLY.

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