ML20091J051

Intervenor Exhibit I-MOSBA-89,consisting of 900402 Final Draft Re IA Diesel Shutdown

ML20091J051
Person / Time
Site:	Vogtle
Issue date:	05/17/1995
From:	AFFILIATION NOT ASSIGNED
To:
References
OLA-3-I-MOSBA89, NUDOCS 9508170300
Download: ML20091J051 (4)

Text

4 Y /4OS/3b ' 8@ [hkCKETEdrm>f.ed d Z 70 0 R A F VSNRC 95 JUL 27 A9:gg@l ,page l of N

[ ROOT CAUSE - 1A Diesel Shutdown The team believes that the 1A Offqg[(ArtJLpd failure of aD0adenwatet#phegise of an intermittent erseeratureofswitch a combination and/or during IR2.

inconsistent calibration techniques DfAhtflese switches 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 Learned 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.

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 0.0 17 0.020 SISTERS 0.027 0.033 0.030 V0GTLE U1 0.04 0.05 0.006 V0GTLE U2 0.006 PLAINTIFFS 9508170300 950517 PDR ADOCK 05000424

1. [00

\> -

O PDR g _g _ og.\

.s n NUCLEAR REGULATORY COMMISSION 2r- -' ,

Docket No. 50 424/425-OLA3 EXHIBITNO. I"- @ b I M ~5 N in the rnatter of Georaia Power Co et al.. Voatie Units 1 & 2 O staff O Applicant QQ intervenor O Other pp,c3E.CT

$ identified O Received O Rejected Reporter CA 9 Date Of alb4 5 Witness Stle tahd n6040

Exhibit 6 ,page 2 of N

UNIT ONE D/O TRIP SEM803 HISTOLY (

SUMMARY

)

D/G SENSOR COMMENTS

, MWO

• DATE 1A LO Turbo LO Press Called - failed -

18624684 12/22/86 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 - JR Hi Temp Found defective -

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

found 2 bad sensors from whse. - finally replaced w/ good sensors 13c06912 10/08/88 1B 1PS-19177 - LO LO Press Failed cal -

1PS-19183 - LO LO Press wouldn't reset properly - replaced under 18807392 18807085 10/09/88 1A Hi Main Brng Temp Replaced due to air Sensors G, H, F leaks 18807637 10/27/88 1B 1TSH-19154 HI LO Temp Re-calibrated OK 1TSH-19119 JW HI Temp Wouldn't cal - 1st new sw. from whse.

also wouldn't cal -

finally got one from whse. to cal OK 13807793 10/31/88 1B 1TSH-19117 & 18 JW HI Failed - had to Temp replace w/new switches 18906313 12/13/89 1B ITSH-19154 HI LO Temp Spurious alarm on D/G 1B Control Panel - most likely intermittent switch 4 .

92 PROJECT 046041 4

(

UNIT TWO 0/G TRIP SENSOR HISTORY (SUlttutg o

589eloff SENSOR C000ENTS lef0 i DATE D/G

~

2X5-4746A Hi Found venting - replaced 28800543 01/24/88 2A

/ 2A Vibration 2PSL-19114 W Venting - found out of 28800810 02/05/88 tolerance - recald to Press 2TSH-19146 Hi Cel checked when connected 28800552 01/25/88 2A to D/G Temp LO 2PSL-4749 A.B.C Cal checked - OK 28800918 02/05/88 2A LO La Press 2PSH-4744 Hi Cal checked - OK 28800919 02/05/88 2A Crank case Press 2PSL-4749 D.E Lo Prass Turbo LO 28 2TSH-19153 LO Hi Cal checked - OK 28801450 02/26/88 Temp

'l 28 2PSL-4859 A B.C. Cal checked - OK 28801547 02/26/88 i Lo Press LO 2PS-4854 Crankcase Cal checked - OK 28801546 02/26/88 2B Hi Press 2PSL-4859 D,E, LO Press Turbo LO l 2PSL-19121 W Lo Press i

28 2XS-4856A D/G Would not trip - Replaced 28802648 04/13/88 Eng Hi Yibration 28 2TSH-19119 R Found venting - calibrated

28803452 04/20/88

' Hi Temp 28 2PSL-4859 A,B.C, Cal checked due to Calcon 28805619 06/07/88 Part 21 - no adj. required to Press LO 2PSL-4749 A,B,C Cal checked due to Calcon 28805620 06/07/88 2A Part 21 - no adj. required to Press LO 28 2TSH-19117, 18, 19 Engine tripped due to 2 28807390 07/21/88 switches venting - recalibra i

Hi a Temp 12/08/88 2A 2XS-4745B Turbo Switch malfunctioned and 28819595 Hi Vibration tripped engine - replaced i

'i 92 FROJECT j o4so43 .

X

~

ExhibitN,pagel 011 h DATE D/G SENSOR CO M NTS Found switch venting - replaced i 19000016 01/04/90 1B 1PSL-4859E Rt Bank Lo Turbo 011 Press PM of various trip sensors

/ 19000439 03/01/90 1A Various .

signed off 3/10/90 2 03/14/90 IB ITSH-4857E Hi Temp Found out of cal high -

19000442 Main Brng replaced under norant PM ,

03/05/90 1A 113N-4747F Hi Temp Found out of cal high -

19000443 Main Brng replaced under normal PM 03/22/90 1A IPS-4749A,B,C Lo LO Post Event Investigation 19001433 Press found A switch would not reset replaced all 3 1PSL-19114 Lo W Cal checked - OK ,

Press 19001482 03/22/90 18 1TSH-4850 Hi Tesp idould not cal to within LO tolerance - replaced IB ITSH-19117, 18, 19 Hi 19117 and 19 were replaced -

19001511 03/24/90 Temp 3 18 recaled ITSH-19153 Hi Temp LO Replaced 19001542 03/26/90 IB IPSL-4903 P-3 Cal checked - OK 19001629 03/29/90 1A ITSH-19110, 11, 12 Hi Cal checked - OK Temp W j

ITSH-19146 Hi Temp Cal checked - acting sluggish -

LO replaced 19001677 03/30/90 1A 1PSL-47490,E Turbo L0 Cal checked - OK l

Lo Press 19001683 03/31/90 1A ITSH-19111, 12 Hi Temp Found venting - replaced W

i I

4 e

i i

e l'

92 PROJECT l 046042  !

i 1 l

__