05000316/LER-1979-022-03, /03L-0 on 790706:bistable 2PB-934B Tripped at Value Exceeding Tech Spec Limit by 0.104 Psi During Surveillance Test on Containment Pressure Protection.Caused by Drifting of Bistable Trip Set Point.Bistable Replaced

/03L-0 on 790706:bistable 2PB-934B Tripped at Value Exceeding Tech Spec Limit by 0.104 Psi During Surveillance Test on Containment Pressure Protection.Caused by Drifting of Bistable Trip Set Point.Bistable Replaced

ML17317B374
Person / Time
Site:	Cook
Issue date:	07/25/1979
From:	Rischling J INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17317B373	List: 05000316/LER-1979-022, Forwards LER 79-022/03L-0 05000316/LER-1979-022-03, /03L-0 on 790706:bistable 2PB-934B Tripped at Value Exceeding Tech Spec Limit by 0.104 Psi During Surveillance Test on Containment Pressure Protection.Caused by Drifting of Bistable Trip Set Point.Bistable Replaced
References
LER-79-022-03L-01, LER-79-22-3L-1, NUDOCS 7907300337
Download: ML17317B374 (4)

LER-1979-022, /03L-0 on 790706:bistable 2PB-934B Tripped at Value Exceeding Tech Spec Limit by 0.104 Psi During Surveillance Test on Containment Pressure Protection.Caused by Drifting of Bistable Trip Set Point.Bistable Replaced

Event date:
Report date:
3161979022R03 - NRC Website

text

NRC FORM 366 U. S, NUCLEAR REGULATORY COMMISSION

{7.77 I 8

ICENSEE EVENT REPORT i

CONTROL BLOCK:

Ql (PLEASE PRINT OR TYPE ALLREOUIRED INFORMATION)

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9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 CON'T KK ooooos L~ JQ' 8

60 61 DOCKETNUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Qlo DURING A SURVEILLANCE TEST ON THE CONTAINMENT PRESSURE PROTECTION - SET IV~

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~O4 BISTABLE 2PB-934B TRIPPED AT A VALUE WHICH EXCEEDED THE T. S.

LIMIT BY IP. 1P4 PS I~

TABLE 3'-4, ITEM I.C.

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+L LJ U0 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

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ON BOTH OCCASSIONS THE BISTABLE TRIP SETPOINT AGAIN DRIFTED ~

ON JULY 13, BISTABLE 2PB-934B WAS 3

DECLARED INOPERABLE.

THE ACTION REQUIREMENT OF T ~ S ~

TABLE 3 ~ 3-3, ITEM I ~ C ~

WAS FULFILLED.

THE DEFECTIVE BISTABLE WAS REPLACED (SEE "SUPPLEMENT)-,

ACTIVITY CONTENT RELEASED OF RELEASE "

AMOUNTOF ACTIVITYQ

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11 12 13 PERSONNEL INJURIES NUMBER DESCRIPTION 41 8 ~00 0

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10 12 13 44 45 46 DISCOVERY DESCRIPTION Q32 SURVEILLANCE TEST LOCATIONOF RELEASE Q NA 7)0730 D337 80 80 80 80 7

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11 12 LOSS OF OR DAMAGETO FACILITY 43 TYPE

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10 PUBLICITY ISSUED DESCRIPTION~

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SUPPLEHENT TO LER8 79-022/03L-0 SUPPLEMENT TO CAUSE DESCRIPTION (FOXBORO, 63U-BC-OHEA-F), THE NEW BISTABLE WAS CALIBRATED AND RETURNED TO SERVICE.

A RECHECK OF THE NEW BISTABLE ON JULY 14, VERIFIED THAT ALL SETPOINTS WERE IN SPEC.

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