ML20099L389

Intervenor Exhibit I-MOSBA-51A,consisting of Transcript Re Joint Exhibit 51 Tape 7,dtd 900322,TR 20-21

ML20099L389
Person / Time
Site:	Vogtle
Issue date:	10/06/1995
From:	AFFILIATION NOT ASSIGNED
To:
References
OLA-3-I-MOS-51A, NUDOCS 9512280216
Download: ML20099L389 (3)

Text

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' DOCKETED-USNRC l' @ MT e .TAPE ExH. 7 si j 2  % DCT 20 P5 :10 i Date: 3-22-90 j 3

4 r 5 0FFICE OF SECRETARY DOCKETING & SERVICE 6 SEGMENT #1 BRANCH

7 TR. 20-21 8-

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. 9 CASH: I know that on the 1B, when we got the, er, high 1 10 lube oil temperature trip, it was about five to ten seconds 11 before the trip actually occurred, even though we had these ,

]_ 12 annunciators.

I 13 MOSBAUGH: YA.

14 CASH: So there was some time lag. And Bruce and them a

i 15 are writing-it. up, but that's how they determined it. They were a

16 .looking at the annunciator and they had people out there and they 1

17 asked them what the pressure was, and the pressure was fine, you a

!. 18 know. People were watching the pressure. They were watching ,

19 general local parameters, g .

4 20 CASH: I feel comfortable that it's that, but I don't  ;

i 21 think -- it's too early to say for sure that we have a common 4

22 mode failure between IA and 18. And but I think that everything 7 l 1 23 preliminarily indicates that we have some type of problem either l 24 with the air logic or with the pressure switches and their i i

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25 calibration and they're holding calibration. Because it looks

26 like to me we've had two trips due to - , two spurious trips that 27- were not related, the two trips that we know and feel that we can

'28 identify.

4 29 CASH: The 1B, we know why it tripped.

30 MOSBAUGH: Two trips on A and now a trip on B.

NUCLEAR REGWAToRY CoMMISSloN Docket No. 50-424/425-oLA-3 EXHIBITNo.i ~ D A 9512280216 951006 in the rnetter of Georale hCo et al Voate Unite 1 & 2 PDR ADOCK 0500 4 . O stas O Appli G/nonenor O Cther

. O identi5ed eived O Rejected Reporter 5'P ,

Dses Is / 6 / 9 r ' witness j

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1 CASH: The first trip on A, we don't know why it 2 tripped. To be honest, we weren't there.

3 MOSBAUGH: We weren't there.

4 CASH: The second trip, we feel confident, though we 4 5 can't say it's not near as clear as this trip on B was, because 6 there was a lot more activity and a lot more -- (inaudible).

7 MOSBAUGH: That's what I thought it was.

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1. SEGMENT #2 2 TR. 29-31 3 MOSBAUGH: Okay? Unit 1 we just finished up the six 4 o' clock outage meeting. We ran the B diesel, as I told you a 5 little earlier, and it tripped on .'ow lube oil -- I'm sorry -- on 6 -high lube oil temperature. This was the Unit 1B diesel. And it 7 tripped around noon or so, and I & C was in there doing a cal on 8 that switch, and we think it's a bad switch or set at a bad point 9 or something. I've asked that we check the Unit 1 switch as well 10 if we think there's any commonality, like bad calibration 11 procedure or anything like that that could have the unit -- if it 12 turns out to be an out of cal problem, I think we need to check 13 Unit 1 the "A" diesel for any similar problem. But it thought, 14 you know, that's definitely what tripped it, and we're going to 15 have to check the cal on it. And there's a reasonable 16 probability that that's the kind of problem it is. We may have a 17 failed switch. That's a possibility, too.

18 SHIPMAN: Do we have a visual indication of --

19 MOSBAUGH: The actual temperature was never high. We 20 checked that.

21 SHIPMAN: Okay.

22 MOSBAUGH: It's a misreading or or misactuatior. of the l 1

23 switch. The temperature was never threatening, was never high.

24 . SHIPMAN: That was going to be my next question. Was a 25 maintenance run when somebody must have been watching it if we 26 have visual indication, how did it happen. Okay.

27 (p.niendiz:\wpaocs\t2pstic n... prose.p...intsv.ex.st 3

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