ML17317B374

LER 79-022/03L-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

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: ML17317B372 ML17317B374
References
LER-79-022-03L-01, LER-79-22-3L-1, NUDOCS 7907300337
Download: ML17317B374 (4)

Text

NRC FORM 366 U. S, NUCLEAR REGULATORY COMMISSION

{7.77 I ICENSEE EVENT REPORT i

8 CONTROL BLOCK: Ql (PLEASE PRINT OR TYPE ALL REOUIRED INFORMATION)

I 6

~pc 8 9 M I BCCZQ800000000000Q841111Qo~Qs LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 CON'T KK 8 ooooos L~

60 JQ' 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 ~

~O3 BISTABLE 2PB-934B TRIPPED AT A VALUE WHICH EXCEEDED THE T. S. LIMIT BY IP. 1P4 PS I~

~O4 TABLE 3 '-4, ITEM I.C.

~OB

~O7 8

~os 80 7 8 SYSTEM CAUSE CAUSE COMP, VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

~II3 Q>> E Q>> ~GQ>> I N S Y R 0 Q4 ~SQ>e ~Z Q16 7 8 9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION EVENT YEAR REPORT NO. CODE TYPE NO.

Q17 LERIRP 8888 RT ~79 L I

~0'2 2 +w ~03 +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

~AQs[34ZJQqq 33

~ZQoo 35

~O 36 37 0 0 0 0 40 HYQn 41

~YQoo 42 Mg, 43 Qos 44 F 1 B 0 47 Qos CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 THE BISTABLE WAS IMMEDIATELY ADJUSTED TO WITHIN ALLOWABLE VALUES RECHECKS OF THE BISTABLE TRIP SETPOINT WAS CONDUCTED ON JULY 12 AND 13. 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)-,

7 8 9 80 METHOD OF FACILITY STATUS  % POWER OTHER STATUS Pf

~3P DISCOVERY DISCOVERY DESCRIPTION Q32 1 8 ~EQ28 ~10 0 Qoo NA ~BQ8> SURVEILLANCE TEST 8 9 10 12 13 44 45 46 80 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY Q LOCATION OF RELEASE Q 7 8

~z 9

Q33 ~z(S 10 ~

11 NA 44 45 NA 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION Q3B

~00 0 Qoo Z Qss NA 80 7 8 9 11 12 13 PERSONNEL INJURIES 8 ~00 NUMBER 0 Qoo DESCRIPTION 41 NA 7)0730 D337 7 8 9 11 12 80 LOSS OF OR DAMAGE TO FACILITY 43 TYPE DESCRIPTION 9 Z Q42 . NA 7 8 9 10 80 o

ISSUED LXJQ44 PUBLICITY DESCRIPTION ~ NA NRC USE ONLY os O

7 8 9 10 68 69 80 o 0

J. L~ PHDNE. 61 6-465-5901 NAME OF PREPARER

0 ~ J II II

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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