05000315/LER-1979-020-03, /03L-O on 790323:pressurizer Relief Tank Rupture Disk Blew Out While in Mode 3.Caused by Repeated Pressure Fluctuations Causing Rupture Disk to Weaken.Corrective Action Unnecessary Since Doors Functioned as Designed

/03L-O on 790323:pressurizer Relief Tank Rupture Disk Blew Out While in Mode 3.Caused by Repeated Pressure Fluctuations Causing Rupture Disk to Weaken.Corrective Action Unnecessary Since Doors Functioned as Designed

ML17317B112
Person / Time
Site:	Cook
Issue date:	04/17/1979
From:	Dickson J INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17317B111	List: 05000315/LER-1979-020-03, /03L-O on 790323:pressurizer Relief Tank Rupture Disk Blew Out While in Mode 3.Caused by Repeated Pressure Fluctuations Causing Rupture Disk to Weaken.Corrective Action Unnecessary Since Doors Functioned as Designed 05000315/LER-1979-021-03, /03L-0 on 790327:pressure in RCS Was Found Below Tech Spec Limit While in Mode 1.Caused by Operator Inadvertantly Opening Auxiliary Spray Valve to Pressurizer QRV-51.Valve Closed Upon Discovery ML17317B110
References
LER-79-020-03L, LER-79-20-3L, NUDOCS 7904240380
Download: ML17317B112 (2)

LER-1979-020, /03L-O on 790323:pressurizer Relief Tank Rupture Disk Blew Out While in Mode 3.Caused by Repeated Pressure Fluctuations Causing Rupture Disk to Weaken.Corrective Action Unnecessary Since Doors Functioned as Designed

Event date:
Report date:
3151979020R03 - NRC Website

text

U S NUCLEAR REGULATORY COMMISSIOPJ ENT REPORT (PLEASE PRINT OR TYPE ALLREQUIRED INFORMATIONI 0

Q34 1

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1 QE~QE 25 26 LICENSE TYPE 30 57 CAT 68 Qs0 4

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7 9QB I4 75 REPORT DATE 80 NRC FORM 366

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A. PRESSU IZ

~03 THE PRESSURE.SURGE 'CREATED IN THE LOWER CONTAINMENT THE ICE CONDENSER INLET

~o4 DOORS WERE SHOWN TO BE IN THE OPEN POSITION BY CONTROL PANEL INDICATIO.

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~06 IS NOT CONSISTENT WITH THE RE UIREMENTS OF T.S. 3.6.5.3.

ALL DOORS WERE MANUALLY

~os CLOSED WITHIN 1.5 HOURS.

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- 81318 CAUSED DOORS TO OPEN SLIGHTLY.

NO CORRECTIVE ACTION PLANNED SINCE DOORS. FUNCTIONED SYSTEM

CAUSE

CAUSE COMP VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

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METHOD OF OTHER STATUS ~

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10 12 i3 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITYQ3

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10 44 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION Q39 1 ~00 0, Q31 ~ZQ38 NA I

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