ML20086U467

Applicant Exhibit A-92,consisting of History of DG Pneumatic Controls Problems

ML20086U467
Person / Time
Site:	Vogtle
Issue date:	06/07/1995
From:	GEORGIA POWER CO.
To:
References
OLA-3-A-092, OLA-3-A-92, NUDOCS 9508040111
Download: ML20086U467 (10)

Text

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Attc hment A % q O- NF '/25 - OQ1 -3 00CKETED USHRC ff( gy, y __yg i

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RISTORY OF DOW{ggj[Cfi

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DG PNEUMARIetrotffAf1

. IT HAS BEEN STATED THAT V0GTLE HAS LO DG PROBLEMS. ~

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. NUREG-1410 LISTS 69 CALCON SENSOR FAILUR  !,

. PRESENTATION WILL COVER 3 AREAS: '

. CALCON TEMPERATURE SWITCNES  :

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. CALCON PRESSURE SWITCNES IN ADDITION, WE HAVE BEEN REQUESTED TO ADDRES ,

RECENT PROBLEMS WITH '

. COOPER STARTING AIR ADMISSION VALVES I

. FOLLOWING A PRESENTATION OF THE HISTQ TECHNICAL FACTS RELATED TO THESc 3 SEP PROBLEMS, OUR CONCLUSION IS THAT: i

. NO CLEAR PRECURSORS TO THE 3/20/90 ARE EVIDENT FROM A REVIEW OF THE' P SENSOR WORK HISTORY.

. GPC DID DO THOROUGH TESTING'AND I 3 GENERIC COMPONENT DEFICIENC SUPPLIED COMPONENTS.

. GPC DID NOTIFY OTHER OWNERS OF AND SOLUTIONS. J l

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CALCON TEMPERATURE SENSOR MODEL A3500-W3 L

TOP PLATE e

TOP PLATE GASKET C

0-RING DISK 5 HAFT POPPET DISK g POPPET l AIR INLET r POPPET SPRING BASE GASKET g

\N, SPRING RETAINER l VENT PORT i

'5EN50R TENSION SPRIN iROTATED)

BASE <

SPACER TUBE SENSOR DISK 5 EXPAND AS TEMPERATURE INCREASES. THEREBY PULLING THE POPPET DISK DOWN ONTO THE POPPET. AS THE POPPET IS PUSHED DOWNVARD. THE AIR ESCAPE 5 THROUGH THE VENT.

AS THE TEMPERATURE DECREASES, SENSOR DISK 5 THE SENSOR DISK 5 CONTRACT. THE SENSOR TENSION SPRING PUSHE5 6

UPWARD AGAINST THE SPRING RETAINER.6 '

VHICH PUSHE5 THE POPPET DISK v UPWARD OFF THE POPPET. THE AIR SUPPLY AND POPPET SPRING PUSH THE POPPET BACK INTO THE POPPET HOLE.

i 4

SUIMARY OF DIESEL GENERATOR TEMPERATURE SENSOR PROBLEMS AT V0GTLE UNIT 1 CYCLE 2 POST EVENT UNIT 2 UNIT 1 1R1 UNIT 1 PRE- OUTAGE CONSTRUCTION CONSTRUCTION (9/88-10/88) 3/20-3/25/90 DUTAGE PRE-EVENT (NSTRUMENT PROBLEM (8/85-12/86) (1/88-12/88)

FUNCTIdM 4 2 4

Out-of-cal. 8 7 l' J. W. Temp. 6 1

J. W. Temp. Defective 1

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L. O. Temp. Out-of-cal.

1 10 Brg. Temp. Defective l l mummmmmmmmes Misc.

3 Vib. Snsrs. Defective e

~~- - _ . . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ " - - - - - ^ - - - - - - _ _ _ _ _ _ _

4 9

JACKET WATER SWITCH PROGRAM RESULTS

'. INSUFFICIENT TEMPERATURE STABILIZATION PERIOD PRIOR TO CALIBRATION.

. CONTAMINANTS ON THE TEMPERATURE SENSO

. CALIBRATION BATH HEATUP RATE.

. THERM 0WELL SETSCREW TIGHTNESS.

. SPACER-TUBE TIGHTNESS.

. INTERNAL CONTAMINANTS.

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b JACKET WATER TEMPERATURE SWITCH PROBLEMS '

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- - Roor CAUSE

. INTERNAL CONTAMINATION CAN CAUSE SWITCH TO .

CONTINUOUSLY VENT. .

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. CALIBRATION OF THE SWITCHES WAS INADEQUATE.

CORRECTIVE ACTION

. CALIBRATION PROCEDURE THAT CLEANS AND PROPERLY CONTROLS THE CALIBRATION REQUIREMENTS.

l

. RELIABILITY OF THE BASIC SWITCH COMPONENT WAS  ;

ESTABLISHED. l

. SWITCHES HAVE BEEN DEFEATED IN THE EMERGENCY  ;

START MODE.  ;

. CURRENTLY EVALUATING REPLACEMENT.

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SIGNIFICANCE OF PROELEM .

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. INADEQUATE CALIBRATION PROCEDURES AND TECHNIQUl

- RESULTED IN REDUCED RELIABILITY OF THE EMERGEN DIESEL GENERATORS.

i CONCLUSION

. BEGINNING WITH PROBLEMS ENCOUNTERED DURING TH FIRST UNIT 1 REFUELING IN 1988, GPC MAS TAKEN A SERIES OF ACTIONS TO RESOLVE DG TEMPERATURE ,

SWITCH MALFUNCTIONS. i

i WTES: .

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. 1 34400 lPtESSURE SEli50R Sul ASSENILIES 7*"*if

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SUMMARY

OF DIESEL GENERATOR l

PRESSURE SENSOR PROBLEMS AT V0GTLE ,

UNIT 1 1RZ lPOSTEVENT UNIT 1 UNIT 2 UNIT 1 1R1 l PRE- OUTAGE CONSTRUCTION CONSTRUCTION (9/88-10/88)

MSTRUMENT OUTAGE PRE-EVENT 3/20-3/25/90 UNCTION PROBLEM (8/85-12/86) (1/88-12/88) 2 4

L. O. Pres. Out-of-cal. 1 1

L. O. Pres. Defective 1

T. O. Pres. Out-of-cal. 1 1

T. O. Pres. Defective I

M. P. (P-3) Out-of-cal. 1 1

M. P. (P-3) Defective i

~~ ~- -~ -. _ , _ , , , .

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j DIESEL GENERATOR CALCON PRESSURE SWITCHE 10CFR PART 21 (MAY 1988)

" DEVICES THAT ARE ALREADY INSTALLED AND. OPER i AFTER SEVERAL-HOURS BE W EEN TESTS HAVE DEMl THEIR RELIABILITY. IMO DELAVAL RECO>t4 ENDS THAT ALL DEVICES NOT INSTALLED, OR THAT ARE INSTALLED BUT HAVE ~

NOT OPERATED FOR SEVERAL HOURS BEWEEN TESTS, BE l RETURNED TO.IMO DELAVAL FOR REMACHINING, INSPECTION

• AND TESTING."  ;

10CFR PART 21 (JUNE 8.1990. AnorNouM 3) -i 12, 1988 MAY HAVE BEEN 3 i "OuR REC 0t#4ENDATION OF MAY CONFUSING AND IN LIGHT OF THIS FAILURE AFTER 9 YEA IT IS APPROPRIATE TO RESTATE OUR REC 0t#4END COOPER INDUSTRIES REC 0044 ENDS THAT ALL COOPER P/N F-573-156,.BE MODIFIED OR REPLACED DEVICES, t

BY DEVICES IDENTIFIED AS CALCON'P/N B4400 l

I -- - -_

b PRESSURE SWITCH FAILURE ANALYSIS R 4

- Roor CAUSE

. MIS-INTERPRETATION OF PART 21 (MAY 19 1

l CORRECTIVE ACTION )

, ALL CALCON PRESSURE SWITCHES HAVE BE  !

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SIGNIFICANCE OF PROBLEM l

. STICKING PRESSURE SWITCHES COULD HAVl IN REDUCED RELIABILITY OF THE EMERGE! '

GENERATORS. l l

_ CONCLUSION

. AS A RESULT OF THE GPC Root CAUSE EV A PRESSURE SWITCH PROBLEM IN 1990, THE VENDO CLARIFIED AND REISSUED THE 10CFR21 NOT l

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