05000316/LER-1979-003-03, /03L-0 on 790106:reactor Trip/Safety Injection Occurred.Caused by Freezing of Steam Generator/Main Steam Pressure Sensing Lines.Freezing Due to Failure to Close Off Steam Vent Openings in West Steam Encl

/03L-0 on 790106:reactor Trip/Safety Injection Occurred.Caused by Freezing of Steam Generator/Main Steam Pressure Sensing Lines.Freezing Due to Failure to Close Off Steam Vent Openings in West Steam Encl

ML17317A926
Person / Time
Site:	Cook
Issue date:	02/05/1979
From:	Rischling J INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17317A924	List: 05000316/LER-1979-002-03, /03L-0 on 790106:during Startup,Auxiliary Feedwater Motor Operated Valve Would Not Close Due to Broken Wire in SMB-0-25 Operator.Caused by Vibration & Use of Solid Conductor 05000316/LER-1979-003-03, /03L-0 on 790106:reactor Trip/Safety Injection Occurred.Caused by Freezing of Steam Generator/Main Steam Pressure Sensing Lines.Freezing Due to Failure to Close Off Steam Vent Openings in West Steam Encl ML17317A923
References
LER-79-003-03L, LER-79-3-3L, NUDOCS 7902120115
Download: ML17317A926 (4)

LER-1979-003, /03L-0 on 790106:reactor Trip/Safety Injection Occurred.Caused by Freezing of Steam Generator/Main Steam Pressure Sensing Lines.Freezing Due to Failure to Close Off Steam Vent Openings in West Steam Encl

Event date:
Report date:
3161979003R03 - NRC Website

text

U. S. NUCLEAR REGULATORYCOMMISSION LICENSEE EVENT REPORT QI (PLEASE PRINT OR TYPE ALLREQUIRED INFORMATION) 6 0

0 0

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I I QE~QE I.ICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 I

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5 QB EVENT DATE 74 75 REPORT DATE 80 NRC FORM 366 (7.77)

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LICENSEE CODE 14 15 CON'T

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60 61 DOCKET NUMBER 68 69 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES &10 A

R E AC T0 R T R I P/ S A F E TY I N J E C T I 0& 0 C C U R R E D 0 N J AN U AR Y 6

D U E T0 S T E A

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~06

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~O7 LINE DIFFERENTIAL PRESSURE.

TH.IS EVENT WAS CAUSED BY'HE FREEZING OF NO.

2 AND 3 STEAM GENERATOR / MA IN STEAM PRESSURE SENS I NG L I NES, AN ATTEMPT WAS MADE TO BLOWDOWN THE SENSING

LINES, BUT NO FLOW WAS OBTAINED.

BEFORE THE SENSING LiNES WERE THAWED,') THE UNIT TRIPPED DUE TO STEAM LiNE oI,FFERENTIAL PRESSURE

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FIRST EVENT OF THIS TYPE.

NO PROBABLE CONSEQUENCES.

~OB 80 7

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SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

~CC Q11 C.

Q13 UZ Q13 Z

Z Z

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QTE 7

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

CODE TYPE NO.

Q11 REPoRT

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LJ UO 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 Q22 SUBMITTED FORM SUB.

SUPPLIER MANUFACTURER

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40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS &27 INVESTIGATION REVEALED THAT THE AMBIENT TEMPERATURE OF THE AREA, WHERE THE SENS ING LINES ARE LOCATEDA WAS BELOW FREEZING.

THIS WAS DUE TO NOT CLOSING-OFF THE STEAM VENT OPENINGS IN THE WEST STEAM ENCLOSURE, 3

4 THESE VENT OPENINGS WERE CLOSED OFF AND THE SENSING LINES THAWED AND BLOWNDOWN RETURN I NG THEM TO SERV I CE.

(

SEE;:SUPPLIEMENT)

METHOD OF DISCOVERY UeQ 45 46 45 J

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L. Rlschllng NAME OF PREPARER 7

8 9

FACILITY STATUS

% POWER OTHER STATUS Q 3

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QEa ~QEE NA 7

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10 12 13 44 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITYQ Pgg Z

Q33 Z

Q34 NA 7

8 9

10 11 44 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION Q39 1 ~00 QRT Z

Q33 NA 7

8 9

11 12 13 P 6 RSONNE L INJURIES NUMBER DESCRIPTION Q41

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Qo N

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9 11 12 LOSS OF OR DAMAGETO FACILITYQ43 TYPE

DESCRIPTION

9 Z

Q42 N

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9 10 PUBLICITY ISSUED DESCRIPTION QS

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10 80 DISCOVERY DESCRIPTION 32 I

LOCATIONOF RELEASE Q36 80 80 80 80 PHONE:

80 NRC USE ONLY OIa 80 0

68 69 6I6-465-590I 3') O >)36I I ) P

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ATTACHMENT TO LER

$ 79-003/03L-0 SUPPLEMENT TO 'CAUSE DESCRIPTION DURING PLANT STARTUP, THIS INSTRUMENTATION WAS MONITORED, INSURING IT FUNCTIONED PROPERLY.

IT WAS ALSO DISCOVERED THAT THE UNIT I

WEST STEAM ENCLOSURE VENT OPENING WAS NOT CLOSED OFF, THESE WERE ALSO CLOSED TO PREVENT RECURRENCE THESE STEAM ENCLOSURE VENT OPENINGS WILL BE CLOSED AS THIS ITEM HAS BEEN ADDED TO A PRE-WINTER CHECK-OUT LIST.

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