05000315/LER-1979-014-03, /03L-0 on 790301:while in Mode 1,indicated Position of Rod F-6 Discovered to Be Oscillating within 15 Steps of Bank Demand Position.Caused by Signal Conditioning Module Connector.Cleaning & Reinstallation Corrected Limits

/03L-0 on 790301:while in Mode 1,indicated Position of Rod F-6 Discovered to Be Oscillating within 15 Steps of Bank Demand Position.Caused by Signal Conditioning Module Connector.Cleaning & Reinstallation Corrected Limits

ML17317B049
Person / Time
Site:	Cook
Issue date:	03/28/1979
From:	Beilman T INDIANA MICHIGAN POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17317B048	List: 05000315/LER-1979-014, Forwards LER 79-014/03L-0 & 79-015/03L-0 05000315/LER-1979-014-03, /03L-0 on 790301:while in Mode 1,indicated Position of Rod F-6 Discovered to Be Oscillating within 15 Steps of Bank Demand Position.Caused by Signal Conditioning Module Connector.Cleaning & Reinstallation Corrected Limits 05000315/LER-1979-015-03, /03L-0 on 790302:while Operating at Full Power, Pressurizer Relief Tank Rupture Disc Blew Out,Causing Ice Condenser Inlet Doors to Open.Caused by Pressure Fluctuations Resulting in Weakened Rupture Discs
References
LER-79-014-03L, LER-79-14-3L, NUDOCS 7904030261
Download: ML17317B049 (2)

LER-1979-014, /03L-0 on 790301:while in Mode 1,indicated Position of Rod F-6 Discovered to Be Oscillating within 15 Steps of Bank Demand Position.Caused by Signal Conditioning Module Connector.Cleaning & Reinstallation Corrected Limits

Event date:
Report date:
3151979014R03 - NRC Website

text

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

LICENSEE EVENT REPORT 4

1 CONTROL BLOCK:

Qi (PI.EASE PRINT OR TYPE ALLREQUIRED INFORMATION) 6 N

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LICENSEE CODE 14

'I5 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 CON'T

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES &10 WHILE IN MODE 1

THE INDICATED POSIT1'ON OF ROD F-6 WAS'DISCOVERED TO BE OSCILLATING 2

WITHIN APPROXIMATELY FIFTEEN STEPS OF BANK DEMAND POSITION.

THIS IS IN EXCESS OF THE LIMIT IMPOSED BY T.S. 3.1.3.2.

SIMILAR OCCURRENCES INCLUDE:

050-315/76-13,44 AND 54, 050-315/77-27,28,33 AND 34.

050-315/78-'04,07,38,40 AND 46; 050-316/78-07,08,22,31,41,48,64,75,84,93 AND 050-315/79-01.

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QET REPORT

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COMPONENT TAKEN ACTION ON PLANT METHOD HOURS +22 SUBMITI'ED FORM SUB.

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0 O26 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS O27 THE CAUSE WAS TRACED TO THE SIGIL CONDITIONING MODULE CONNECTOR, WHICH AFTER CLEANING AND REINSTALLATION RETURNED THE INDICATION TO WITHIN ALLOWABLE LIMITS.

NO FURTHER ACTION IS PLANNED.

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FACILITY STATUS

% POWER OTHER STATUS 0 3

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10 12 13 44 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITYQ36

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10 44 PERSONNEL EXPOSURES NUMBER TYPE

DESCRIPTION

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11 12 13 PERSONNEL INJURIES 7

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11 12 LOSS OF OR DAMAGETO FACILITY~43 TYPE

DESCRIPTION

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10 PUBLICITY 7

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10 T.

P, Beilman 80 80 45 80 ggo~I~~ extol 80 80 "80 NRC USE ONLY ESo 80 o

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METHOD OF DISCOVERY DISCOVERY DESCRIPTION

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