05000315/LER-1979-009-03, /03L-0 on 790223:in Mode 1 Both Emergency Diesel Generators Were Inoperable on Separate Occasions.Caused by AB Diesel Generator Running in Parallel & Other Emergency Generator Out for Maint.Operating Procedures Revised

/03L-0 on 790223:in Mode 1 Both Emergency Diesel Generators Were Inoperable on Separate Occasions.Caused by AB Diesel Generator Running in Parallel & Other Emergency Generator Out for Maint.Operating Procedures Revised

ML17317B007
Person / Time
Site:	Cook
Issue date:	03/13/1979
From:	Lease R INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17317B004	List: 05000315/LER-1979-007-03, /03L-0 on 790218:suction Valve of West Centrifugal Charging Pump Found Closed.Caused by Mistaken Closing Following Surveillance Testing.Incident Is Being Reviewed 05000315/LER-1979-008-03, /03L-0 on 790207:containment Atmospheric Air Particulate & Gaseous Radiation Monitoring Sys Pump Was Continuously Tripping.Caused by Misalignment of Pump Bypass Flow Adjustments Due to Normal Pump Wear.Flow Rate Adjusted 05000315/LER-1979-009-03, /03L-0 on 790223:in Mode 1 Both Emergency Diesel Generators Were Inoperable on Separate Occasions.Caused by AB Diesel Generator Running in Parallel & Other Emergency Generator Out for Maint.Operating Procedures Revised ML17317B003
References
LER-79-009-03L, LER-79-9-3L, NUDOCS 7903190316
Download: ML17317B007 (4)

LER-1979-009, /03L-0 on 790223:in Mode 1 Both Emergency Diesel Generators Were Inoperable on Separate Occasions.Caused by AB Diesel Generator Running in Parallel & Other Emergency Generator Out for Maint.Operating Procedures Revised

Event date:
Report date:
3151979009R03 - NRC Website

text

~NRC FORM 366 I7-77) 8 CON'T 7

8 U. S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT 1

CONTROL BLOCK:

Q1

{PLEASE PRINT OR TYPE ALLREQUIRED INFORMATION)

/

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LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 1

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9 QB QB 60 61 DOCKET NUMBER 68

'69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Q10 M DE 1

BOTH EMERGENCY DIESEL GENERATORS WERE INOPERABLE ON TWO SEPARATE

~03 OCCASIONS CONTRARY TO TECH.

SPEC.

3. 8. 1. 1.

ONE TIME FOR 1

HOUR AND THE OTHER

~o4 TIME FOR 7 MINUTES.

ACTION RE UIRED BY TECH.

SPEC.

WAS MET.

NO PROBABLE

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CONSE UENCES.

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SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE QK\\

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10 11 12 13 18 19 20 SEOUENTIAL OCCURRENCE REPORT REVISION LF R]RP EVENT YEAR REPORT NO.

CODE TYPE NO.

Q REPGRT

@@, ~

LZL/Lll

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~Q3 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 L6JO13 ~HQs LZJQ2D

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9 Q23 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 II II G

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RUNNING IN PARALLEL WHICH CONFIGURATION THE OTHER EMERGENCY DIESEL GENERATOR WAS MADE INOPERABLE FOR RE UIRED

'I 3

MAINTENANCE.

TO PREVE T THIS FROM REOCCURING THE PARALLEL OPERATION PROCEDURE HAS BEEN REVISED WITH A STATEMENT THAT THE OPPOSITE ENGINE CONTINUED PAGE 2 7

8 9

FACILITY STATUS

% POWER OTHER STATUS QBO 1

5 28 P

O 29 NA CD PIO ~O ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITY EKI ~Q33 LJQ34 NA 7

8 9

10 11 44 PERSONNEL EXPOSURES NUMBER TYPE

DESCRIPTION

~00 OJO~ZOEE NA 7

8 9

11 12 13 PERSONNEI. INJURIES NUMBER DESCRIPTIONQ41 EZ LQLOLQIOE'A METHOD OF DISCOVERY

~AQ31 45 46 45 DISCOVERY DESCRIPTION OPERATOR OBSERVATION LOCATION OF RELEASE Q36 NA 80 80 80 80 7

8 7

8 O

7 8

9 11 12 lOSS OF OR DAMAGETO FACILITY 43 TYPE

DESCRIPTION

Z Q42 NA 9

10 PUBLICIfY ISSUED DESCRIPTION~

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10 68 69 NRC USE ONLY 80 80 1 sl cva 80 ~ a NAME PF PREPARFR R.

S.

LEASE (616)'..465-5901 X-313

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CONTINUATION OF LER 0 79-009/03L-0

'AGE 2

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (CONT.):

MUST BE OPERABLE AND REMAIN OPERABLE TO ALLOW PARALLEL OPERATION.

THE RE(UIREMENT TO BLOCK UNDER VOLTAGE BUS STRIPPING WILL BE ELIMINATED BY A REVISION THAT IS PLANNED TO BE INSTALLED DURING THE NEXT REFUELING OUTAGE THAT IS NOW PLANNED FOR APRIL AND MAY OF THIS YEAR.

DURING THE 7 MINUTE INCIDENT THE "CD" DIESEL GENERATOR WAS INOPERABLE FOR A MAINTENANCE ITEM.

THE "AB" DIESEL GENERATOR WAS STARTED TO MEET TECH SPEC SURVEILLANCE 3.8.l.l ACTION ",a."

AND-THE GENERATOR FIELD FAILED TO EXCITE.

WE HAVE EXPERIENCED THREE UNIT TRIPS WHEN STARTING AN EMERGENCY DIESEL GENERATOR AND ALLOWING AUTOMATIC FIELD FLASH.

IT HAS BECOME OUR PRACTICE TO DEPOWER THE FIELD FLASH CIRCUIT WHEN TEST STARTING AN EMERGENCY DIESEL GENERATOR AND ALLOW THE RESIDUAL MEGNETISM WITHIN THE FIELD TO BUILD UP THE EXCITATION.

THIS TIME RESIDUAL WAS SO LOW THAT THE FIELD FAILED TO EXCITE.

THE GENERATOR WAS SHUT DOWN AFTER THE 7 MINUTE RUN AND POWER ESTABLISHED TO THE FLASH CIRCUIT.

AN INSTRUMENT TECHNICIAN WAS CALLED OUT AND THE GENERATOR FIELD WAS ENERGIZED PRIOR TO ENGINE START AND THEN DEPOWERED.

THE ENGINE WAS TEST STARTED AND THE EXCITATION BUILT UP.

SHIFT PERSONNEL HAVE BEEN TRAINED IN HOW TO EXCITE A GENERATOR FIELD PRIOR TO ENGINE START AND THE PROCEDURE HAS BEEN REVISED TO ALLOW THIS.

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