ML17326A284

LER 79-032/03L-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

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: ML17326A280 ML17326A282 ML17326A284
References
LER-79-032-03L-01, LER-79-32-3L-1, NUDOCS 7910160511
Download: ML17326A284 (4)

Text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION (7.77)

[CENSEE EVENT REPORT A

CONTROL BLOCK: Qi (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

I 6

~O 7 8 9 M I D C LICENSEE'ODE C 2 14 Q2 15 0 0 0 0 0 0 LICENSE NUMBER 00 0 0 OQE

'25 26 4 1 1 LICENSE TYPE 1

IQE~Q 30 57 CAT 58 CON'T

~O 7 8 REPDRTILI~

SOURCE 60 61 0 5 0 0 0 DOCKET NUMBER 3 1 6 68 Qj 69 1

EVENT DATE 74 QS 75 1 0 1 REPORT DATE 0 7 9Q 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES 010 DURING A SURVEILLANCE TEST ON PRESSURIZER PRESSURE-PROTECTION SET I,

~O3 'THE HIGH PRESSURE REACTOR TRIP BISTABLE WAS FOUND TO TRIP AT A SET-

~O4 POINT CORRESPONDING TO 2417 PSIG. THIS EXCEEDED THE REACTOR TRIP

~O6 VALUE SPECIFIED IN T.S. TABLE 2.2-1.

~OB

~O

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

~OB ~IR Q11 UEQ12 UGQEE I N S T R 0 QE USS LH S 7 8 9 10 11 12 13 18 19 20 Q11 LERIRO REPoRT EVENT YEAR

~7 21 9

22 U

23 Uo 24 SEQUENTIAL REPORT NO.

OUz26 U~

27 M

OCCURRENCE 28 CODE 29 REPORT UTYPE 5 30 31 REVISION U

NO.

32 p

ACTION FUTURE TAKEN ACTION 33 QIB ~Z 34 '5 Q19 EFFECT ON PLANT

~Z Q20 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 ON SEPTEMBER 1 1 I THE SHUTDOWN METHOD QJ 36 Q21 BISTABLE 37 HOURS +22 40 WAS ADJUSTED TO ATTACHMENT SUBMITTED PJ 41 Q23 NPRDQ

~

FORM SUB.

42 Q24 PRIME COMP.

SUPPLIER

~A 43 WITHIN ALLOWABLE VALUES Q26 44 COMPONENT MANUFACTURER 47 Q26 AND RETURNED TO OPERATION. ON SEPTEMBER 18, A RECHECK OF THE BISTABLE TRIP VALUE INDICATED THAT THE BISTABLE HAD AGAIN DRIFTED, THIS TIME IN A CONSERVATIVE DIRECTION. THIS BISTABLE WAS DETERMINED TO BE 3

INOPERABLE AND THE ACTION REQUIREMENT ( SEE SUPPLEMENT) 4 7 8 9 80 FACILITY STATUS 9IPPOWER OTHER STATUS Q METHOD OF DISCOVERY DISCOVERY DESCRIPTION Q32 5 E QES ~10 0 QES NtE ~BQ31

'6 SURVEILLANCE TEST 7 8 9 10 12 13 44 45 80 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE Q 7

6 8 9 Z Q3

'0 Q Z PERSONNEL EXPOSURES 11 NA 44 45 80 NUMBER TYPE DESCRIPTION Q39

~oo oQETUzQER NtE /

80 7 8 9 11 12 13 PERSONNEL INJURIES 7 8 9 11 12 80 LOSS OF OR DAMAGE TO FACILITY 43 TYPE DESCRIPTION ZQ4, NA 7 8 9 10 80 O

ISSUED

~NQ PUBLICITY DESCRIPTION ~ NA NRC USE ONLY 2

7 8 9 10 68 69 80 ER J. L. Rischling 616-465-5901 0 a

NAME OF PREPARER PHONE: 59

fg 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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