ML20083D072

Intervenor Exhibit I-MOSBA-89,consisting of Final Draft Re Diesel Shutdown

ML20083D072
Person / Time
Site:	Vogtle
Issue date:	04/19/1995
From:	AFFILIATION NOT ASSIGNED
To:
References
OLA-3-I-MOS-089, OLA-3-I-MOS-89, NUDOCS 9505240273
Download: ML20083D072 (4)

Text

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ROOT CAUSE - 1A Diesel Shutdown

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The team believes that the 1A dies ipped ebecausehof a combination of an intermittent failure of a jac bterJtemperature switch and/or inconsistent calibration techniques f"' th&se iswitches during 1R2.

Subsequent testing has shown that the '3/20/90 diesel annunciator indication could be reproduced on a high jacket water trip. The jacket water trip switches have proven reliable on these and similar engines between overhauls.

Key Lesson Learmed and Recommendations

1. Calibration procedures should be reviewed with the vendor to ensure that calibrations are consistent, and switch performance is reliable.

2. Operator training should be revised to ensure that operators realize that an emergency reset will override the high jacket water trip.

3. Maintenance procedures should be revised to ensure that post overhaul control air leaks meet acceptance standards (bubble test performed).

4. The undervoltage start of the diesel should be changed to bypass non-essential engine trips to improve overall reliability.

V Diesel Reliability In 1989 Vogtle diesels have been more reliable than other nuclear industry diesels.

Safety System Performance (Emergency AC Power -- BWR & PWR)  ;

1987 1988 1989 US BQ 0.010 0.009 0.012 US MEDIAN 0.017 0.017 0.020 SISTERS 0.027 0.033 0.030 V0GTLE U1 0.04 0.05 0.006 1 V0GTLE U2 0.006 h

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, / Exhibit x 8 ,page ^ ota UNIT CNE O/a TRIP CENSO2 RISTORY (CtnotARY)

MWO 8 DATE D/G SENSOR COMMENTS 12/22/86 1A LO Turbo LO Press Called - failed -

(. / 18624684 replaced 1PSL-4749D TSH-19112 - JW Hi Temp Found out of tol, 18806902 10/11/88 1A during PM - recal.

18805581 10/18/88 1A TSH-19112 - JW Hi Temp Found defective -

replaced l

18807746 11/03/88 1A TSH-19110 & 11 - JW Hi Just PM'ed - found Temp bad (out of cal.) -

found 2 bad sensors l

from whse. - finally replaced w/ good sensors 1 18806912 10/08/88 1B 1PS-19177 - LO LO Press Failed cal -

l iPS-19183 - LO LO Press wouldn't reset properly - replaced i under 18807392 c

l 18807085 10/09/88 1A Hi Main Brng Temp Replaced due to air )

Sensors G, H, F leaks ,

1 18807637 10/27/88 1B 1TSH-19154 HI LO Temp Re-calibrated OK iTSH-19119 JW HI Temp Wouldn't cal - 1st l new sw. from whse.

also wouldn't cal -

finally got one from whse. to cal OK 1 1

18807793 10/31/88 1B 1TSH-19117 & 18 JW HI Failed - had to Temp replace w/new switches 18906313 12/13/89 1B 1TSH-19154 HI LO Temp Spurious alarm on D/G 1B Control l Panel - most likely l intermittent switch

! 92 PROJECT l 046041 l

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' '. UNIT TWO D/G TRIP SENSOR HISTORY (SUMMAR g SENSOR C000ENTS 20 # DATE D/G 2A 2X5-4746A Hi Found venting - repla'ced r 28800543 01/24/88 Vibration l

2PSL-19114 JW Venting - found out of 28800810 02/05/88 2A l

to Press tolerance - recald 01/25/88 2A 2TSH-19146 Hi Cel checked when connected 28800552 Temp L0 to D/G 02/05/88 2A 2PSL-4749 A B.C Cal checked - OK 28800918 LO Lo Press 02/05/88 2A 2PSH-4744 Hi Cal checked - OK I 28800919

! Crank case Press 2PSL-4749 D E Lo Press Turbo LO l

28801450 02/26/88 2B 2TSH-19153 LO Hi Cal checked - OK Temp 28801547 02/26/88 28 2PSL-4859 A,B,C, Cal checked - OK l

Lo Press LO 28801546 02/26/88 28 2PS-4854 Crankcase Cal checked - OK Hi Pmss 2PSL-4859 D.E. LO Press Turbo LO

2PSL-19121 JW Lo Press 28802648 04/13/88 2B 2XS-4856A D/G Would not trip - Replaced Eng Hi Vibration 28803452 04/20/88 28 2TSH-19119 JW Found venting - calibrated Hi Teap 28805619 06/07/88 28 2PSL-4859 A,B,C, Cal checked due to Calcon Lo Press LO Part 21 - no adj. required '

28805620 06/07/88 2A 2PSL-4749 A,8,C Cal checked due to Calcon .

Lo Press L0 Part 21 - no adj. required 28807390 07/21/88 28 2TSH-19117, 18, 19 Engine tripped due to 2 Hi JW Temp switches venting - recalibre 28819595 12/08/88 2A 2XS-4745B Turbo Switch malfunctioned and .'

Hi Vibration tripped engine - replaced I

i O 92 FROJECT i 04604J 'j

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01/04/90 18 IPSL-4859E Rt Bank Found switch venting - replaced 19000016 Lo Turbo Oil Press ,

i 19000439 03/01/90 1A Various PM of various trip sensors  !

signed off 3/10/90 J 19000442 03/14/90 1B 1TSH-4857E Hi Temp Found out of cal high -

Main Brng replaced under norinal PM 19000443 03/05/90 1A 1TSH-4747F Hi Temp Found out of cal high -

Main Brng replaced under normal PM 19001433 03/22/90 1A IPS-4749A.B.C Lo LO Post Event Investigation Press found A switch would not reset replaced all 3 1PSL-19114 to JW Cal checked - OK Press i 19001482 03/22/90 IB 1TSH-4850 Hi Tesp Would not cal to within LO tolerance - replaced 19001511 03/24/90 IB 1TSH-19117, 18, 19 Hi 19117 and 19 were replaced - f Temp JW 18 recaled l 1TSH-19153 Hi Temp LO Replaced ,

19001542 03/26/90 IB 1PSL-4903 P-3 Cal checked - OK ITSH-19110, 11, 12 Hi Cal checked - OK O 19001629 03/29/90 1A Temp JW ITSH-19146 Hi Temp Cal checked - acting sluggish -

LO replaced 19001677 03/30/90 1A 1PSL-47490,E Turbo L0 Cal checked - OK Lo Press 19001683 03/31/90 1A ITSH-19111, 12 Hi Temp Found venting - replaced JW l

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O 92 PROJECT l

046042

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