ML20129B264
| ML20129B264 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 06/11/1985 |
| From: | NRC COMMISSION (OCM) |
| To: | |
| References | |
| NUDOCS 8507290112 | |
| Download: ML20129B264 (64) | |
Text
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kO'3Yb 77 1 Tuesday Afternoon Session g
2 June 11, 1905 3 3:20 o' clock p.m.
4 - - - - -
5 (present: Messrn. Burns, Rossi, Do ll, 6 Donrd, Lanning, Shaf er, Jackiw, Kosloff, Rolos and 7 O'Connor.
8 MR. ROSSI: What we are going to do now 9 is just discuse the feedwater nystam, the auxiliary 10 feodwater sy stem a nd the main stean system, and the 11 Steam and Feodwater Rupt'tre Control Systen just to 12 get a better understanding of how the systemn work rm
(,) 13 at the Davis-Desse plant. That's what we want to 14 do. And you havo given un three or four drawings 15 here and you can make sore comnentn on what those 16 drawings are so that that will be on the record.
17 HR. O'CONNOR: Let's overybody --
18 MR. LANNING: Hay I interrupt you a 19 second. Would you state your name first and givo 20 us a little background as to your position.
21 HR. O'CONNOR: My nane is Bill O'Connor, 22 I'm the operations superintendant. I havo boon at 23 the station for about eleven years. I have been 24 the operations nuperintendent since last september.
ACE PEDERAL REPORTERS INC.
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78 1 Prior to that, I was the operations I'T
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2 engineerino supervisor for several years. I was 3 the operations training supervisor for about a year 4 and a half. I w a's a training instructor before 5 that.
i 6 I was a reactor operator, auxiliary 7 operator, equiprent operator, cane up through the 8 ranks while through that time I was going to schcol, 9 got my degree and all that, then noved on into the 10 office engineering positions.
11 I was in the Navy before that. In fact, 12 I met Larry in the Navy. We worked together for a
() 13 while at Sic. I was surprised to see hin when he 14 walked in today.
15 MR. LANNING: Thanks very nuch.
i 16 MR. O'CONNOR: I do have a senior license.
17 I had an RO license before that. I have been 18 licensed for about, oh, since 1978.
19 Let's look at the nain feedwater drawing 20 first, the one that says Main Peedwater system, 21 Figure 1, the official d r aw in g number i f you have a 22 set of P&ID is M-006B. In other words, if you are I 23 fanting to oct great detail and you act a real P&ID, _
24 it looks like this one, but this is a simplified ACE PEDERAL REPORTERS INC. .
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79 1 drawing showing the major flow paths. i 2 I would like to describe the flow' path of I
~3 the main ~feedwater system and the startup system
, t 4 first, and then we will talk about the auxiliary
-5 f eedwater system a nd then the main steam system. l t
2 6 so we will'go through each of these drawings in ,
- 7 sona ~ detail.to. explain our flow paths at ;
i 8 ' Davis-Desse.
t
{ _
9 -MR. BEARD: Bofore you._get into the i 9
1 10 drawings, are theseJdrauings made up~for training-
- 11 purposes?
12 HR. O'CONNOR: Yes. These are simplifled ,
i
() 13 training. drawings.
14 MR. BEARD: Do you have a strong feeling, 4
7 15 do they really reflect the plant? .There has.been 16 some problems that training documents don't really ,
1' t 17 reflect the plant. !
18 MR. O'CONNOR: I feel these drawings .
19 adequately reflect.the major. flow ~ paths, and I ;
20 don't expect-to find a ny .ma jo r errors.-- there may :
21 be some'of the valves that are shown'normally open
+
r .
- 22 here and'normally closed- 'that may'not..be ,
{
23 necessarlly 100 percent-true. But I don't think ;
e 24 that there is any glaring ~ errors in.these.
Os . _
i ACE FEDERAL REPORTERS INC.
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[ 80 1 Let's start out with the nain feed system.
t ,
'"# We have two main feedpumps at Davis-Besse. They 2
3 are t u rbi ne-d ri ven pumps. On one end of the 4 turbine is connected the shaft of the turbine which 5 is connected to the main feedpump. The ot her end 6 of the turbine shaft connects to a gear reducer to 7 the booster feedpump.
8 In other words, on your' drawing.you have 9 got a main feedpump and a booster. pump, they are 10 connected to the sane turbine, one is on one end 11 and one is on the other. The booster pump, hovover, 12 does have a gear reducer. It's about a 2.8 to 1
() 13 reduction.
14 The nain feedpump turbine receives its 15 ateam supply at full power from the c ross -a roun d 16 steam to the moisture separator reheaters. He will 17 get to that a little bit later, but there is also 18 supply from the main steam system.
19 In other worda, when you start the 20 -turbine up, initially on the main steam, as we 21 build up cross-around pressure in the turbino, then 22 the high pressure control valve will end up not in 23 control. The low pressure control valven will take g3 24 over.
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ACE FEDERAL REPORTERS INC.
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'l I' don't know it.you:want to 'go into the f l
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2 :speci fics ?
3 14 R . BELL: Who makes these turbines here? l
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4 :: MR. O'CONNOR:
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5 , MR. . BELL . Do they have an electrohydraulic >
r i !6 control system'oria control --
7 Mit . O'CONNOR . No.- We-have.what: is I
)
8 called'an:MDT 20 's y s t e n . It's an electronic 4
'9 control system. It's-not - we use.a speed pick-up 3
~ 10 for-the signal and . then it controls a-secondary 11 Loperatings piston- t o the a ctual . valve- . cove ring.
12 MR. BELL: Then is'the.EHC system used to 3
- ( ) -13 operate thatEpiston?. ,
r 14 MR. O '. CONNO R : - Not in the tera you-want-11 5 to.use EHC. system. That'sLa-high1 pressure fuel i
! :16 system.- g i
17 MR. BELLS. HNot-off the. turbine EHC. ;
18 HR. O'CONNOR:- No. '
i j :
19 MR. BELL: .Okay.
12 0 MR.. O'CONNOR: It's driven off the main ,
i t
2
'21 oil: pumps'for the turbine - 'for the feedpump -
22 . turbine,.and'it's not'an~ electrohydraulic control
- ~23 .. s y s t e m separate to the turbine. ;
t
-24 Normal flow, rate through'the, main: .
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82 i 1 feedpump turbines-at-full power is about six 2 .million pounds per hour nominally. The feedpumps i
3 discharge through1 two-nonreturn. valves, their .
I 4 FW-488 and.491'shown on your drawing, right on the !
5 . discharge of the pumps.
,t 6 Up through there_ie ~ a cross-connect i
7 header at that noint that joins the two feedwater -- ,
8 high pressure f eedwater heaters together. _O u r two r 9 high pressure feedwater strings.through our four, j -
10 five'and'six feedwater heaters down each train, l
then'the piping ~ joins back down together again for 11
, 12 about ten or fifteen feet'of pipe when it branchen- ,
~
-( ) [13 off to the two control valve ~ networks for-the 14 individual steam generators.
15 We have minifeed-valves, FW-44 and'139 l 1 16 shown=near the top of you r' drawing, these maintain ,
,17 the minidum 32 gallons a. minute required for the
-18 feedwater nozzlen to insure that they always remain i-
'19 full and we don't1 thermal shock the nozzles. So 20 th ey are -alway s throttled to 32 gallons a minute.
~
21 Actually: it 's a litt1e -- that's the mininal. They 5 :
22 are typica lly ' 401 to 50 callons per minute. {
23 I m me d i a t'e ly below them is the startup. [
.,-s 24 control valves,JSP7B'and'SP7A.- These~ valves would ,
i .
l ACE' FEDERAL REPORTERS INC. ,f l (202) 347-3700 j
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83 1 be during a startup the first ones that we would fh
2 open, and they would control up to around 15 3 percent power.
4 MR. DELL: These valves are the valves 5 used prinarily to hold you on the low level limit 6 uhen you are s ta rt ing it.
7 MR. O'CONNOR: Yes. These valveH will 8 control on low level limits.
9 MR. BELL: SP7B and 7A, okay.
10 MR. O'CONNOR: They are air operated 11 control valvos from the integrated control system.
12 MR. BELL: And manual control station's
() 13 in the control room?
14 MR. O'CONNOR: Manual control in the 15 control room.
16 HR. DELL: Okay, sir.
17 MR. O'CONNOR: Below that we have SP6A 18 and 6B, which are the main feedwater control valves 19 which as the startup valvo gets to 80 percent full 20 open,-it will send a signal to open the block valvo 21 to the main food control valves, which would ho 780 22 and.779, the two valves with the circle and the M 23 chown_as a motor operated valve, they automatically rm 24 open when the startup valve gets to about 80
()
ACE'PEDERAL REPORTERS INC.
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I 84 1 percent open to put the main control valve in l
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2 service.
3 So now during a startup we would have the 4 minifeed's throttle at about 40 gallons a minute, 5 the startup valve.would end up being full open and
- 6 the main valve taking over as control at about 80 7 percent open on the startup valves. ,
8 HR. Sil A F E R : Por the record, SP7A is the ,
9 one that failed on the feedoump?
i i
10 MR. O'CONNOR: Yes. We were not able to 11 reopen immediately after the trip. It has a blocking 12 function to allow overriding the Steam and
(]) 13 Peedwater Rupture Control closure, but it did not 14 open innediately. He were able to act it open 15 several minuten later when we got an I & C tech in 16 the back, and I'm not sure of the details of what 17 he did at this time, but he was able to '
18 successfully get it blocked.
19 Downstream of these three valves which 20 are in parallel is a check valve on each side, No. {
21 147 and'156. This is immediately outside the 1
22 containment and next to the containment isolation 23 valves 612 and 601. -
gm 24 612 and 601 are the large motor operated
'd ACE FEDERAL REPORTERS INC.
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85 1 feedwater stop valves that isolate immediately A
k# 2 outside the containment building. These valves are 3 autonatienlly closed on Steam and Feedwater Rupture ,
4 Control logie and Safety Peatures Actuation logic.
5 MR. BELL: Automatic closure signals to 6 SP6 and 7 are just the Steam and Peedwater Rupture i
7 Control.
8 MR. O'CONNOR: Control.
9 HR. BELL: And you use that to backup the 10 closure on 612 and 6017 >
11 MR. O'CONNOR: Yes, sir. The logic -- we 12 will get into that when we do the SPRCS, but they
] () 13 close on opposite sides to assure any single 14 f a ilu re will always assure feedwater isolation.
15 MR. DELL: So maybe 612 comes off channel 16 chain --
i-17 MR. O'CONNOR: 601 and 612 are on .
4 18 opposite channels, as 6A and 68.
19 MR. DELL: 612 6B and 7B would be 20 opposite channels?
4 21 MR. O'CONNOR: 612 and 7B are on the same 22 channel and 601 and.7A is on the opposite side 23 channel. When we get to that one drawing that '
w 24 shows all of them, I will go through which channels *
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06 I they operate off of. I think it might he easy ta
()
2 explain that.
3 HR. O'CONNOR: Downstream of 612 and 601, 4 the piping just goes into the containment and l 5 enters the feedwater nozzles. That takes care of 6 the discharge side of fh e feedpump. Let's move 7 back over to the suction side.
8 -MR. BEARD: Before you go there, since 9 the question has already arison about this SP7A 10 valve that apparently failed to reopen, that's the 11 .one where you tried to radi o a startup punp and 12 food and that valve kept you from usina that valve.
() 13 MR. O'CONNOR: To that steam generator.
14 MR. BEARD: Could you show un just 15 quickly where the electric startup pump feeds into '
16 this diagram? ,
17 MR. ROSSI: He's getting to that, I ,
18 believe.
19 HR. BEARD: I was just trying to relate 20 this before we get too far away from this.
21 MR. O'CONNOR: If you look at the hottom 22 of your chart are the motor driven startup feedpunp 23 and coming out the left nide of that pump and r3 24 following the arrow up, it ties to FW-106 into the V
ACE PEDERAL REPORTERS INC.
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07 1 common feedwater header downstream of PW-45, which 2 is a manual isolation valvo.
3 HR. ROSSI: Okay. So it comes in 4 upstream of the heaters.
5 HR. O'CONNOR: Yes, sir.
6 HR. ROSSI: Okay.
7 HR. O'CONNOR: I guess we can start with 8 the startup pump next before we go to the suction 9 of the pumps. The startup feedwater punp is an l 10 electric driven feedpump. It's rated at 300 11 gallons a minute. It is used on normal startups up r 12 to about one to two percent power. That's all it's
() 13 capable of supplying feedwater, the capacity of it.
14 We have a problem in our startup --
15 HR. ROSSI: What's the megawatt thermal 16 rating of your plant?
17 HR. O'CONNOR: 2772.
18 Our Startup Peedpump piping is not 19 seismically qualified and it pannes through the Aux 20 Peedpump room, so we have to maintain this piping 21 isolated during power operation so that when the 22 Startup Peodpump, when it is in service on a :
23 startup, we have to maintain an opnrator in the 24 room such that if the piping wore to break, he can ACE PEDERAL R EP O RT!* R S INC. ;
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88 1 stop the pump and isolate the piping so it can O,
- 2 affect the Aux Pood pump systen.
3 MR. ROSSI: And where does that isolation 4 take place on that piping?
r S HR. O'CONNOR: What's required on tho a
- 6 isolation is on the auction sido we have to 7 naintain the suction PW-32 shut, which is the 8 suction from the denorator, we have to maintain the ,
9 dischargo sido shut with FW-106, which is up by the ;
10 feedwater heators, we have to maintain the cooling- ,
11 water supplies shut, which are not shown on this ;
12 drawing. They are cooled from the turbine building >
13 cooling water systen. In other words, the puno is
(])
14 isolated from the syston so that it doesn't count l
15 as a high energy line break.
16 MR. ROSSI: PW-32, is that the one right 17 here and that goes back to the deacrator?
1 18 MR. O'CONNOR: Yes. I f you go back right 19 here, I'll find a spot on the drawing where that in 20 located. Right here where it has got an 4 right 21 next to this FW-85, that's the other and of the 22 Startup Poedpump. If you connect this A and this A 23 together, that's the other end of that pipe. .
24 HR. ROSSI: Okay.
n ss ACE PEDERAL REPORTERS INC.
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09 1 MR. O'CONNOR: Which is off the deaerator 2 cross-connect header.
3 MR. ROSSI: Okay. ;
4 MR. DEARD: But the valves that would be 5 closed durine normal operation or the ones that ,
6 this person down there would close in the event of 7 a problem, would they be 106, 91 and 32' 8 MR. O'CONNOR: And the cooling water !
9 isolation valves, CW --
10 MR. BELL: Which there are none shown.
11 MR. BEARD: But the ones that are on this 12 diaorams w ou ld be those three?
() 13 MR. O'CONNOR: Yes.
14 MR. DELL: How, the other one you used to 15 startup the feedwater pump building, where was it 16 getting its suction produced?
17 M2. O'CONNOR: When they lined it up the '
18 other night, it was getting the suction from the 19 deaerator. They lined it up to PW-32. That did 20 ca u s e , in other words, if this was lined up in .
21 standby, they would have been able to start it 22 ir. mediately from the control room. But since we 23 have to keep it isolated, this is a recent t
24 requirement, starting up from this refuel, we had i ss ;
ACE PEDERAL REPORTERS INC.
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90 1 to keep this pump i s ola ted. Prior to this filling (b
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2 it was normally in standby and you could start it 3 fron the control room.
i
! 4 MR. DELL: So you are saying had it not l
l 5 been for compliance with the seismic -- nonseismic 6 qualifications of this pump, this pump would have l
7 been immediately available?
l 8 HR. O'CONNOR: Immediately available, yes.
l 9 MR. ROSSI: Well, to put it into service, 10 you had to open up FW-32 and PW-1067 f
I 11 MR. O'CONNOR: And the cooling isolation 12 valves.
l
() 13 MR. ROSSI: And that cannot be done from l
14 the control room?
l 15 MR. O'CONNOR: They were all manual 16 valves.
17 MR. DELL: 12 , 14-inch lines?
18 MR. O'CONNOR: Yes. It's about - I think l
l 19 the suction lines is a ten or twelva, and the 20 discharge lines is a six or an eight.
21 MR. ROSSI: And that started this is s t 22 re fue li ng.
23 MR. O'CONNOR: Yes. We used to have the 24 pump in service with PW-32 open and 106 open.
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91 ;
1 MR. DELL: Adequate auction pressure can
/~N I
2 be maintained on the startup pump from just the 3 head in the deaerator storage tanks?
4 MR. O'CONNOR: The deaerator storago are 5 in the top of the turbine building and the punp is 6 in the basement. So I don't know exactly how many 7 feet, a hundred feet plus the pressure in the 8 deaerators.
9 MR. SHAPER: Por the record, if I may, 10 the rationale for keeping the startup feedpump 11 isolated because the lines are not seismic is ,
12 basically because those lines pass throuch the
(]) 13 auxiliary feedwater pump.
14 MR. O'CONNOR: I said that in the 15 beginning.
16 MR. DEARD: liigh enercy line.
17 f tR . S!!A F E R : That's right.
18 MR. BEARD: !! a s this electric startup 19 pump b et e n in the plant design since day one?
20 MR. O'CONNOR: Yes, sir. ,
21 MR. BEARD: It hasn't been added, t
22 MR. O'CONNOR: It's been there nince day l 23 one. ,
t 24 MR. BELL: And you r normal feed path and ACE PEDERAL REPORTERS INC. ;
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92 1 startup you normally feed through the feed norelo.
O 2 then richt up through the six or coven' 3 MR. O'CONNOR: Yes.
4 HR. BELL: Would it be the sovens, .
5 because the nixes would be isolated?
6 HR. O'CONNOR: Richt. Once we get up to l t
7 about two percent p ow e r , then we put a main !
8 feedpump on, shut down the startup pipe and isolate 9 it.
10 MR. LANNING: Is that a nanual operation 11 now you are talking about? l 12 HR. O'CONNOR: Yes, sir.
(]) 13 MR. LANNING: It's all manual.
14 MR DEARD: So you don't use Aux feed
- 15 startup?
16 MR. O'CONNOR: No, sir.
17 MR. LANNING: When do you switch over to 18 automatic control of feedwater?
19 MR. O'CONNOR: Feedwater control on the 20 valves is put into automatic prior to lifting off 21 what we call low level limits. In othe r word s, all ,
22 of the valves would be in full autonatic control. I 4
23 He typically do not put our main '
24 feedwater pumps in automatic until we oct the flow ACE FEDERAL REPORTERS INC. ,
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- 1 rate up over three or four nillion pounda per hour. ;
i V(3 2 They don't like to control at low flows in i 3 automatic. You j ti s t -- they are not available.
4 MR. BELL: Dut to amplify your answer, 5 you can startup with startup control valvos in auto? ;
6 MR. O'CONNOR: They are in auto. )
i 7 HR. BELL: You startup with Aux standby 8 maintaining you at your low level limit? :
9 HR. O'CONNOR: The valves are in l
l 10 automatic, the purps are not. Once we got up off i
l 11 of low level limits is when we put the purns in 12 automatic.
() 13 Now, lot me clarify that a little bit.
14 nased on some of the problems we have had with our 15 feedpump oil control systems over the last few
! 16 months, we have bonn -- we recently chanond our 17 ntartup procedure to maintain one of the main 10 feedpumps in manual control at all timen, because
! 19 we have had some spurious trips in automatic and we 20 f t:11y added extra instrunentation to the No. 1 main l
l 21 feedpump, we are running it in automatic and No. 2 I
! 22 in manual control in hopen to isolate this spurious 23 problem that was not able to be fully -- you know, 24 we weren't sure we could fully sol ve that or had (S
%.J l ACE FEDERAL REPORTERS INC.
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r 94 1 found the root cause to that problem.
O 2 MR. BEARD: Could you say again, Bill, 3 what that problen was?
4 HR. O'CONNOR: We were having spurious 5 trips of tho main feedpump following a reactor trip 6 and were not able to isolate a cauce. We would go 7 in and check all the pressure switches, run the 8 pumps up and down, reset them, trip them and could 9 not duplicate the trip. So what we did following 10 our last trip, that would have been I think on the 11 2nd or the 3rd, we fully-instrumented the No. I 12 main feedpump, we went into places in the oil
()) 13 system, we went across all of the trip contacts in 14 the electronic trip circuitry no that we could --
15 and put strip charts on all those thinga no wo 16 coald isolate it to a particular fault if it 17 tripped again.
18 HR. ROSSI: Then you put No. 2 --
19 HR. O'CONNOR: Then we ra n No. 2 in 20 manual control. [
21 HR. BEARD: It seems the trips were 22 associated only if it was in automatic.
23 MR. O'CONNOR: Yes. ;
l S 24 HR. ROSSI: Do you have experience that i / l ACE FEDERAL REPORTRRS INC.
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95 1 indicates that that's the casa?
O 2 MR. O'CONNOR: Every trip we had was in 3 that mode. And while we were doing the testing ,
4 shutdown, we were not able to cause it to trip in 5 manual.
6 ftR. ROSSI: Okay. !
7 HR. BELL: But you were ablo --
7
) 8 !! R . O'CONNOR: Wo were able to cause it '
9 to trip when it was under ICS control. So we put 10 it in manuni control in hopes that we could koop j 11 one punp and varify that the rapid feedwater 12 reduction nystem, which I will get to a little I O la later. "asn t ine r3nceine som thina and causino !
14 the foodpump to stop change too fast and trip it.
15 ttR . DELL: Okay. Now, there are feedpump t 1
1 16 speed controls, is it a function of the delta P ,
i i 17 across the feed valvo network up here? ,
1 i 18 !! R . O'CONNOR: Yes. The one next in the 19 feed delta P across foodwater control valves and i
20 feedwater demand.
4 21 HR. DELLS And the other is feodwater 22 domand. .
23 HR. O ' C O N !! O R : Yes. j 24 Prom the ICS.
!. (p
./
f1R . ROSSI:
ACE PEDERAL REPORTERS INC.
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96 1 HR. O'CONNOR: Yes.
2 HR. BEARD: One of the thinas I heard --
3 and it may not be accurate -- but you had sono 4 problen with governors. And I don't know whether 5 that is a situation on the rain fend or the Aux 9 6 Pead.
7 HR. O'CONNOR: Both.
O HR. REARD: I don't want to get into it i 9 in great detail.
10 MR. O'CONNOR: We chanced the speed pump 31 controln during thin lant outage. ,
12 HR. ROSSI: The main?
() 13 HR. O'CONNOR: Main and one of the Aux. ;
14 The old systen was what I want to call the r e v r. o r o 15 OM systen with all the lovers and springa, and I 16 don't know a real name for it, but we disannembled 1
17 the entire old coverning system and put in a now i
10 electronic governing cysten for the nain foodpunps.
, 19 MR. BEARD: That was thin oti t a go .
20 HR. O'CONHOR: Yes, sir.
21 HR. DrLL: And those trips didn't show up 22 until you had the new turbino governor systen in
]
23 placo? ;
4 24 HR. O'CONHOR: Right.
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ACE PEDERAL REPORTERS INC. ;
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97 1 And we have had the vendor in here 1
! ()
2 nurorous ocensions and he's made adjustments to !
f 3 like the thrust wear pressure switches and turbine ,
4 control oil pressure, trying to isolato it to a l 4 5 particular fault. i 6 HR. ROSSI: And that vendor is? ;
7 HR. O'CONNOR: From General Electric. j 8 HR. RELL: You don't -- when you have n i
~
i 9 reactor trip that trips the turbine, taking a j 10 turbine off, the turbine trip will not result in n j 11 feedpump trip, will it?
12 HR. O'CONNOR: It should not. We have
() 13 had several spurious trips, and that's onn of the 14 problems that we are trying to nolve.
15 HR. ROSS!: Let's nee. When you trip the 16 turbine then, does the steam flowing to the main ,
3 ,
. 17 feedpumps revert to the main steam hender? '
i 10 HR. O'CONNOR: To the main steam hender, 19 yes. It's just a function of there is a high 20 pressure control valve'and five low pressure l
21 control valves, and initially the low pressure 22 valves open, but there is no low pressura steam i
23 since the moisture separator reheators have no I 24 steam in them at that point.
i ACE PEDERAL REPORTERS INC. '
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l 98 I l
1 As the last low pressure valve opene, it
() 2 opens up the high pressure ntop v41ve to allow the i
3 high preneurn control va lve to start control over i
i 4 the mainstream. As you start building n l 5 cross-pressure, as that prennure builds up, the 6 first thing it does is the governing mechanism seen
~,
7 this pressure increase and the spned starts to i'
8 increase, the first valve it closes down on in the 9 high pressuro valve, and a s we cet more and more 10 cross-around pressure, it presses down on the LP l 11 va l ve n to control.
{
12 HR. JACK 1We Dill, do you know if UK rade
(]) 13 the mod i f f. cat ion s at other plants?
4 l
14 HR. O'CONNOR: I'm not familiar with
! 15 whether GE nade the nodifications. I believe that [
il 16 they did, but I can't may for nure.
17 HR. JACK!W You don't know if other ,
4 18 projects are having the same probines with trippino? -
19 HR. O'CONNOR: I know SHUD had some 20 problems when they changed out, but they didn't 90 21 to the ernet same systen we did. They went to a 22 similar system but not the exnot namn one.
23 HR. LANNING: This feedpunp is instrunented i i
! 24 presently; is that correct?
ACM PMDMRAL REPottTEMS INC.
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1 MR. O'CONNOR: No. 1 in. l 2 HR. LANNING: No. 1 in. So thern are 3 data available during this transient feedwater pump 4 No. 17 ,
5 HR. O'CONNOR: Yes. The data that we saw -
6 innediately after the trip, none of the electronic 7 trips had picked up. The only thing that had ,
a picked up was a mechanical t rip on overspeed. i k
l 9 And our flow data shows and our speed 1
10 data shows that the pump did trip on overspoed, and 1
i 11 what we are theorising now, since we haven't been 4 12 able to go into the cabinets because we havn a ntop l
(]) 13 work essentially, in that the speed pickup to the 14 electronic circuit opened up. In other words, it's 15 sensing npeed off a magnetic pickup.
16 If it sees a r.ero speed signal, it tolla l
17 the turbino controls that the turbine in not s
la turning any more and seyn speed up. If it octa a s
19 r.oro input, it will tell the valvna to open just an ,
- i i 20 fant as they can go and would give an overnpned t 21 trip. OE told us that in nur training alon. i 22 HR. DELL: Dut isn't there more than one !
23 speed pickup? f i
24 HR. O'CONNOM There is two pickups, yes. ;
w !
Aca ProenAL ntPORTens Inc. l (202) 347-3700 ,
4
-_ - . _ . - - - - . - _ . - - _ - - - - .~ ~ - - ... _. . - - - _ - - -
s i
. 100 l 1 But they come together in a parallet path. If it .
l () 2 failed at the last point u p t o -- in othe r words, i l 3 if I open the wire after the speed pickups como .
4 together, in other words, when it leaves the MDT-20 4 5 cabinet to the governor control syntom, anywhero in f l
1 6 that circuit, it would be a zero input. If it I l 7 failed at the turbine, then the other one will l i .
1 8 still cone in. [
9 HR. DEARD: Have you had any experienco !
l 10 of failures of that type? g t
l 11 HR. O'CONNOR: No, sir. i 12 HR. DEARD: So there is no reanon to i
() 13 believe that that in the cause other than 14 speculation? l
? !
15 HR. O'CONNOR: Other than we had an f
1 !
- 16 overspeed trip and no other contact showed trip.
! i l
17 HR. BEARDS Dut your history doenr't show (
18 that. ;
19 HR. O'CONHOR: No. .
I i 20 HR. HELL: Isn 't there an electronic i 4
21 overspeed trip on that pump too? $
t i 22 HR. O'CONNOR: No. i l 23 HR. DELhs There is not.
i 24 HR. O'CONNOR: Not to my knowledge. All 1
O ACE PEDERAL REPORTERS INC.
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101 ,
1 there is is a pochanic. There is high speed stops !
() 2 and everything that if the speed goes up, it's not t i
3 supposed to lot it go over like 105 percent of f I
4 rated speod. !
5 MR. BEARD: That's what I don't 7 6 understand as to why your high speed systems didn't f i
7 come in. !
O MR. O'CONNOR: Even OE in our training ;
i 9 following an outage said a zero speed sional will 10 not be protected by a high speed atop, it will no e
11 to overspeed. They nald the change is too fast to
, 12 he caught by anything. f
() 13 Hn. nMAnD Are we about at the end of 14 the main feed storage?
15 Hn. O'CollNOR: I would liko to go back to ,
16 the six for a minute. The normal suction for the 17 feedpumps is from the deacrator storage tank. Wo 18 have two large tanks of sixty-four thousand gallons 19 each which provides auction to the feedpuppn, and 20 these are normally cross-connected through two l 21 valves, PW-423 and FH-04, so either feedpump can 22 take auction from either donerators, and both 23 deaerators stay at the same level during normal i
24 operation.
ACC PEDERAte REPORTERS ! !!C . !
l (202) 347-3700
I 102 i l 1 Now, feed into the denorators la from the j l
l C) 2 condensate system. So unlike other systems, if we i
l j 3 were to trip all our condensate powern, our j i
4 feedpumps still have a suction, and there is about !
5 four to five minutes of water thora on a loss of !
l l l 6 condensate for our plant.
)
f 7 So we could turn all of our condensate l !
8 pumps off and still havo water to the feedpumps for 9 about five minutes. And our integrated control j 10 system has a runback associated with the deaerator i
11 level, i f you get to four foot in the donerator, it i
12 will run the plant back to 55 percent in
(]) 13 anticipation of a loss of a feedpump.
i 14 MR. DEARD: Okay. With regard to how l 15 this system performed during the event, I don't 16 really think we intended to get into it this hour. [
17 Maybe you can clarify, the question has come up in 18 my mind, the failure of the tio. I nain feedpurp is 1
- 19 what we are now calling the transient initiator and !
l 20 then somewhat later the tio. 2 tripped out ! guens l ?
21 on loss of steam.
22 MR. O ' C Otl N O R : I didn't trip out. It 2J costed to a stop because it had no head steam to ;
I 24 the turbine ACE PEDERAb REPORTMR8 INC, -
- (202) 347-3700
i 103 1 HR. DEARD: Go you ended up with one out
' C:t 2 inmediately at the onset and the second one constad 3 down after about five minuten, so you had still '
4 main feed in the plant for about five ninutes aftnr ;
5 transient stop' ;
6 HR. O'CONNOR: Its post-trip response 7 was norral. It calmed down to low level limite.
i l !
j 8 everything looked normal. Camn into a normal l
9 post-trip TP condition. It was at that point that 10 things started coina away when the HDIVm went 11 closed an that. f i
12 nut there is enough steam when the f
()
f 13 t ti r b i n e trips and closes the valven, that the 14 moisture separator rohnators, and the water in 15 their drain tanko flashing off, thoro in quito a !
l 16 bit of steam t rapped in there and the main !
l.
17 stannlines to run the main foodpump turbines, and [
l 18 the main feedpump tu rhines are ennentially under n ,
19 no load condition at this point because wh en otir ;
r 20 reactor trips, we have a rapid feed reduction 21 syste m which innediately jams the main feed valves 22 closed and the startup valves to s target position 23 of about 20 percent open. That's equivalent to !
24 about 4 percent K heat load, 4 to 5 percent, where .
I w ACE PEDERAL REPORTERS INC.
(202) 347-3700 -
- i
104 1 is where it should be targeted to coast it rioht in '
O 2 on low level limits ;
3 MR. BEARD: Is part of that control f
! h
, 4 system also something that would tend to speed up {
J 5 the turbine in anticipation of pumpino it against 6 the hioh p r e s s u ret ? >
7 HR. O'CONNOR: Yes, sir. Part of that i
8 system sends a target speed signal to the main 9 feedpumps -- their normal speed at full power in 10 somcwhere between four thousand and forty-four 11 hundred rpm. Each one is a little different. And l
j 12 after the trip, it targets that speed up about two 1
() 13 hundred more rpm. l
- 14 HR. HEARD
- It's about a 5 percent 15 increase roughly.
L i
16 HR. O'CONNOR: Yes, sir.
17 HR. DEARD: So you r control synten is a
l 10 telling the turbine to speed up. j J ,
! 19 HR. O'CONNOR: Valves to close. l 20 MR. BEARD: And I heard rumor, and I'll 21 characterize it as purely rumor, and the reason ! l
- 22 bring it up now is to not the record straight and ;
i i 23 at least get ne atraight. Have you had probleen on i
(3 24 the main feedwater side of the balance of that
. U ACE PEDERAI, REPORTERS INC.
(202) 347-3700
105 1 system turning, i f you will, to the control aspects O 2 of thin speeding up the turbine side and closing '
3 down the valve, and I guess there is a speed 4 novernor involved in that. i 5 MR. O'CONNOR: We have had sone 6 difficulty making all of the things come together 7 at the same time. The tarcot speed adjustment, O what is done there is it's a pure minus ten to plus 9 ten volt ramp, and the speed is supposedly linear 4
i 10 so they pick off, it should be at 8.2 volts or i
11 whatever and it should be forty-six hundred rpn. -
i 12 That voltage, however, they found later to be too f
l
() 13 high and our feedrunp was actually going to a ruch 14 higher speed. ,
j !
l 15 HR. BEARD: So it was nonlinear. l 16 HR. O'CONNOR: So it was nonlinear, if I
17 you would like to call it that. They found some i
) 18 other signals that were getting to it affecting 19 that voltage and made further adjustments following
?
20 the trip we had a week ago to the rapid feedwater :
21 reduction system to put this speed back down to 22 where it was supposed to be. He didn't get n 23 chance to check it because the feedpump tripped.
{ 24 HR. DEARD: Okay. The last thought or ACE PEDERAL RETORTERS INC.
(202) 347-3700 i 1
106 1 question I had in this line here is that have you
'( 2 had these problems since y ou put in this s' o w I 3 guess governor, if you can call it that, in here in 4 this last outage, or have those problems been over !
5 a longer period of timo?
6 HR. O'CONNOR: We have experienced somo 7 problems with the rapid foodwater reduction system a since its inception several cycles ago.
9 HR. ROSSI: It's a separate nystem from 10 say the ICS.
11 HR. O'CONNOR: It's part of the ICS.
12 HR. ROSSI: It is a part of the ICS.
() 13 HR. O'CONNOR: It's a separate subsystem 14 to the ICS.
15 HR. ROSSI: But you haven't always had it 16 in the ICS?
17 HR. O'CONNOR: No. I can't remember what ;
18 refueling we added to it. It seems to me it was at 19 the end of cycle three I.want to say, but it may 20 have been -- I th i nk it was cycle three.
21 HR. ROSSI: Let me ask you this. During 22 the event, main feedwater pump two as far as you 23 havs been able to determine up until now worked tho 24 wny it should have worked?
)
-l ACE PEDERAL PEPORTERS INC.
(202) 347-3700
1 107 1 MR. O'CONNOR: Yes. ,
/~N 2 HR. ROSSI: Okay. And the rapid 3 feedwater reduction system after the trip worked 4 the way it was supposed to work. .
1 5 HR. O'CONNOR: Yes. i-6 MR..ROSSI: The problon with the main l 7 f e e d.w a t e r pumps that's known now was that something 8 went wrong with main feedpump No. I and initiated 9 the transient. But as far as main feedwater pump 10 No. 2 is concerned, and I don't know how nuch in 11 looking at it you have done up to now, its controls 12 and everything worked the way you wou ld expect then
() 13 to work?
14 MR. O'CONNOR: Is normal, yes, sir. ;
15 MR. ROSSI: It being in manual?
16 HR. O'CONNOR: Yes, sir. The operators i 17 did raise its speed up. In other words, when the 18 main feedpump No. I tripped, the p la n t starts an 19 automatic runback to 55 percent power haaed on a 20 loss of a feedoump. In other words, they cot the 21 ICS reactor power limited by feedwater alarn t
22 runback in effect and they raised up No. 2 feedpump 23 to pump some more water with it, which is what the rx 24 ICS would have done also.
(J ACE PEDERAL REPORTERS INC.
(202) 347-3700
108 1 The plant was running back normally, and
, ,O, 2 this is one of those triggers that for un, if we 3 are up'above 85 percent power, it's a 50/50 chance 4 we will make the runback. If we are below about 80 5 percent, it's guaranteed you usually make it.
6 So that being the case, they ran up No. 2 7 feedpump, everything was kind of all richt, but at 8 30 seconds we didn't make it. We tripped up high 9 reactor cooler pressure. In other-words, one 10 feedpump can only pump a little over seven million 11 pounds per hour, and the feed flow you need at that 12 point is around eight our nine for the power level
() 13 they dere at and the power was ramping off, the 14 turbine was rampirg off, but they just didn't make 15 it. We were on a cross-limit, but they didn't nake 16 it.
17 HR. DELL: Your reactor was cross-limiting la feedwater7 19 HR. O'CONNOR: Yes.
20 MR. BELL: What was your initial rod 21 position?
22 MR. O'CONNOR: The' rods, I can't tell you 23 the exact percent, they were about 92, 93 percent O
-) 24 with drawing group seven.
ACE PEDERAh REPORTERS INC.
(202) 347-3700
\
f]
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I 109 2 J 1 MR. BELL: ;We are getting more into' j I
2 incidents than we are systems.
3 ft R . ROSSI: Okay. l l
4 .MR.-O'CONNOR: That pretty well takes i
5 care of the main feedwater system. I would'like to 6 defer the: Aux Pumps which are down at the botton of l l --~: . . 7 the drawing until we get :to another drawing. l M'R . BEARD: Can we t'ke a two-minute 8 a 9 break and go'down-and pick up some coffee or i
, .10 something? !
j-
~
11 MR. .ROSSI: Okay. We will take a break e a
12 of four or five minutes then. i
- ( 1- 13 (Thereupon, a-brief recess was taken.)
14 - --- -
e 15 MR. O'CONNOR: I-redrew.the drawing 16 ca'11ed Figure 41,.SFRCS Components.- There is one i 17 error on the auxiliary feedpump to discharge line [
. . . 7
'18 where it says PDS.2685. Delete that from the r i
, 19 drawing and move it straight down'to the next pipe i
-20 on the' main fee'd drawing.
] 4" .
- 21
, MR.-MEARD:- This.isLon the top half of:
22 .the drawing;wefare talking'about?
l 23 MR.,O'CONNOR: Yeah, on the. top half of ,
'y the drawing. Inl.other words, this well, it
,- ~24 -
r j , l ACE FEDERAL REPORTERS INC. j h
(202)-347-3700:-
a so
-.3..- i f
- (< . , , , , .
110 l 1 ~would be this one. This DP on'your drawing was l
'- 2 shown right here, move it down here.
. 3 MR. BEARD: Whore the initials that go 4 with that, I assume that's an instrument, should 5 that be PDS or FDS?
6 HR. O'CONNOR: PDS, pressure differential P
7 switch. These are training drawings and if the 8 real numbers and everything, the valve numbers are 9 okay, but the switch numbers, like I say, this is a 10 training drawing. It's not officially controlled 11 from the book that I got it out of.
12 MR. BEARD: I'm not criticizing you.
() 13 MR. O'CONNOR: It should be PDS, pressure 14 differential switch.
15 All right. This shows the feedwater 16 valves that are controlled by the Steam a nd 17 Feedwater Rupture Control System. What I would 18 likeEto do now is show the valves in a condition 19 that'they would'have been prior to the event and 20 discuss what valven move by the Steam and Feedwater 21 Rupture Control-System.
22 HR. ROSSI: Okay. You will differentiate 23 which ones do_cortain things on level and which 7 s, 24 ones do certain-things on pressure.
(_).
ACE F" SERAL REPORTERS.INC.
4 202) 347-3700
^ i F
r . i
". 111 L
l' M R '.' O'CONNOR: Yes. 1 2 MR.JDEARD: So you are going -- -
6 3 MR.;O'CONNOR:
I'll draw it in a full ,
.4 power. 11'ne to begin with. !
5 , MR. BEARD: All right.
t 6 MR. O'CONNOR: Probably that's the t
7 easiest thing to do.
8 MR. BEARD: Why don't you do it outloud -
~
I .
t 9 so it/will go on the transcript. .
10 MR..ROSSI: Say_the position of each -l
) 11 valve aus you -- ;
i
! 12 MR. O'CONNOR: FW-780 is.open, FW6B is
() 13 open,cFW7B is.open -- I left out a valve. This is 14 - 612, FW-612 is open. .That's.on'the.nain feed line
+
15 to Steam Generator l'. -The same or the 16 comp'l'imentary va lves on Steam Generator 2 FW-799-is "
! - 17 - open,cFW6A, FW7A and FW-601 are open. ;
i 18 One thing to keep in mind here, just as a 19 , little "Oh, by the way," the valves l labeled B go to 20 No.'l. steam generator, which isn't logical but
- 21 that's the way it in, and the va l ve's labeled A go i 22 to No. 2 steam generator. And'that is consistent ',
12
'.
- l 23 'through,the plant. In other words, thi s whe n we 24 get'to theinteam drawing, you will see it also,_
.O 1'
ACE-FEDERAL REPORTERS INC.
(202): 347-3700
.T 4 #
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112 1 like ICS llB goes to No. 1 eteam generator and A 2 goes to No. 2.
3 When you get to our reactor protection 4 system, if you get into that, you will find the 5 breakers don't go A , B, C, D, 1, 2, 3, 4. They go 6 B, A, D, C. So it's a little cotfusing i f you 7 haven't been here.
8 MR. BEARD: On the Aux speed system, I 9 take it the 608 and 599 would normally be closed?
10 MR. O'CONNOR: No.- On the Aux system,
- 11. 608 is normally open, 599 is normally open, 3870 is 12 closed, 3869 is closed. I forgot the other two. I (q;,
13 forget which one goes to No. 1. 3871 and 3872 are 14 both closed. ;
15 MR. BEARD: So all four of those 16 cross-over valves.are closed, feed and cross-over?
17 MR. O'CONNOR: Yes. Let's go to the 18 bottom =part of your drawing and mark it up so we 19 get our normal lineups. On.the steam side, the 20 flew pass from rioht to left here, the atmospheric 21 dump valve, ICS llB, is normally closed. The steam 22 generator steamline warmup drain, MS-394 is 23 normally closed. The main'ateam isolation valve r~3 24 101 is normally opened. The by-pass valve 101-1 is
-V ACE PEDERAL REPORTERS INC.
(202) 347-3700
113 1 normally closed. The nonreturn valve, th a t 's just 2 a check valve, and it's obviously normally opened.
3 On the other steam generators, Steam 4 Generator 2, ICS 11A is normally closed, the 5 atmospheric dump on that side. The warmup drain 6 MS-375 is also nornally closed. The main steam 7 isolation valve on Steam Generator 2 MS-100 is 8 normally opened. Its by-pass 100-1 is normally 9 closed, and the nonreturn valve is also normally 10 open.
11 Now, this section of the header continues 12 on to the main turbine stop valves and other (N) 13 connonents downstream in the main steam system.
14 For the auxiliary feedpump turbines, their steam 15 supplier for all four valves, MS-106 is normally-16 closed. 106-A is normally closed, 107-A is 17 normally closed. 107 is normally closed.
18 The next valve is -- that is not labeled 19 on your drawing immediately downstream of these 20 steam valves -- this is actually a dual valve.
21 There is a trip throttle valve, and it is normally 22 opened. Downstream of that not shown is the 23 governor valve, it also is normally open when the 12 4 turbine is shut down. So there is another valve in (m).
v
- ACE FEDERAL REPORTERS INC.
-(202) 347-3700 T
114 1 here called the governor valve, which is normally "E 2 open also.
3 MR. BEARD: There is a label on the .
4 drawing in that area that says auxiliary governor.
5 Is that the area you are talking about?
6 MR. O'CONNOR: Yes. I think on your 7 drawing it shows it -- yeah, where it says 8 auxiliary governor, that's actually two valves, to <
9 be technically correct. There is a trip throttle 10 valve and a governor valve right in series. We 11 will get into those in just a couple of minutes.
12 So everyone understands the normal lineup?
([) 13 All right. Let's go back to the feed 14 system. Before we get to that, I would like to 15 list the trips on the Steam and Feedwater Rupture 16 Control.Systen. The first one is low steam 17 generator level, and the setpoint for that is 18 twenty-six and a half inches. The second one is 19 stear-to-feed differential pressure, and the 20 setpoint of that is 177 paid. In other words, if 21 the feed pressure is less than the steam pressure 22 by 177 pounds, the Steam and Feedwater Rupture 23 Control System will actuate.
fS 24 MR. ROSSI: Feed less than steam.
L)
ACE FEDERAL REPORTERS INC.
(202) 347-3700
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115 1 THE WITNESS: Yes.
s
2 MR. O'CONNOR: The third actuation is low 3 main steamline pressure, and the setpoint for that 4 is 612 pounds. And the forth trip and the final :
i r
S trip is loss of all four reactor coolant pumps. So
~
6 there is.four actuation signals for the Steam and.
7 Feedwater Rupture Control. System.
i-
-8 MR. BEARD: On that loss of reactor 9 coolant. ;
10 MR. O'CONNOR: It's monitors -it senses 11: the same thing as the: reactor protection system.
12 In other words, it's that dual current transmitter.
( ). 13 If the current -- you have got a normal current, if 4
14 it's high orilow,.the pump contact monitor circuit .
I 15 senses the loss of forepumps. Same thing as the 16 reaction-protection'systen.
17 MR. ROSSI: Pump motor currento.
18 MR. O'CONNOR: -Y e s . It's-the Bailey dual
, 19 current. sensor, black box; okay? Any cuestions on 20 the four actuation signals? :
21 For ease of discussion, the low steam *
-22 generator level or th e ~ s t'e a m-t o- f e'e d differential .j
~
23 pressure.do the exactosame things to these l 5 24 So we will discuss what:these'two 2
(1)1 components. )
5> ACE FEDERAL REPORTERS INC. !
(202) '347-3700 l I l
116 1 signals do to the Steam and Feedwater Rupture
~
2 Control system first. In other words, we will 90 3 through those components one by one and see how 4 they move for these two signals, then we will talk 5 about the difference in a low pressure -- in a loss 6 of low pressure and loss of reactor coolant pumps.
7 On a low cteam cenerator level or a 8 stean-to-feed differential pressure trip, the main 9 feedwater block valvos, 780 and 779, will go closed, 10 the nain feedwater control valves, 6A and 68, will 11 go closed -- I don't know if I can mark this up 12 here.
,~
(,,) 13 MR. ROSSI: SP6A and SP6B on here.
14 MR.-O'CONNOR: How_about if I put a 15 little mark above these for where they go during 16 the trip?
17 MR. DEARD: If they are open, they are 18 going to go to the opposite' direction.
-19 MR. O'CONNOR: Yes.
20 MR. ROSSI: They close, okay.
21 MR. O'CONNOR: The startup feed control 22 valves go closed,-7A and 7B. The containnent 23 isolation valves 612 and 601 go closed. The f- 24 auxiliary feedpump discharge valves 3870 would go V
ACE FEDERAL REPORTERS INC.
(202) 347-3700
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w 117 ;
~
.1 open, 3869 would remain closed. 3872 would open, :
I)- 2 '3871 would remain closed. In other words, the 3 auxiliary feedpumps No. I would line up t o No. I f
-4 steam' generator, No. 2_would line up to No. 2 staan [
i 5 . generator.
~
6 The containment isolation valves 599 and ,
7 6 0 8 ,- they.are already open but.they receive an open 8 signal. .In other words, Uhey are sent an open .-
9 signal, even though the' valves are normally open. !
. 10 So the.feedwater side of the system, we isolate
- 11 fully the main feedwater'on hoth steam generators ;
i 12 and line up the auxiliary feedwater so that the 1
- () 13 complimentary pump feeds its' st'eam generator. In 14 other words, No. I lines 'u p to feed No. I steam ,
i 15 generator, No.-2JAux. Feed-lines up to feed No. 2 }
16 steam generator.
17 This is a normal response,' assuming all 18 four Steam and:Feedwater Rupture Contro1Echannels 19 function ~normally.. On the steam side, the -- we i 20 are still talking ' abou t a = 1ow . s team generator level
~
' =
21 and steam-to-feed differential pressure, the. ;
4 22 atmospheric dump val'ves. ICS llB and 11A are i 23' ~c losed-Land receive a closed signal. #
--24 ~ I shouldn't say - .they may be open ACE FEDERAL REPORTERS INC, ,
4 (202).347-3700 3 5
F e' $ %"rT .@
7 C yvwc=n+y y y %e' r -- w==p - u-- - -
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_ . - .- . . _- _ .m ~ _ - _ , _ . - _ . . - . _ . . __ _ _._. . .- .
% ~
s 118 f
. ._ 1 blowing steam, but when the trip comes in they get l 4
b ( )-'
2 a close signal. The steam-generator drain valvos I i
'3 394 and 375 or the main steam valves cet a closed l
-4 signal. The Main Steam Isolation valves MS-101 and i
L 5 100:get: a closed signal.
} t 6 The main staan isolation by-pass valves j
- t 7 .101-1 and 100-1 get a closed signa ~1. The' auxiliary
- 8 .eedpump turbines line up'to steam from their y
9 respective. steam generators.; MS-106 will . pen, ;
10 106-A will' remain closed, 107 will'open, 107-A will _
-11 remain, closed. ;
- 1. i-12 in other worda,.they:will.-be steaming !
O 13 t ro thei r 'owa t a= sea rator. "o t tro= no t-14 .No. ~2,from No. 2, remembering they are,also feeding 15 their own steam generator.- -That's a normal i :
16
-response ~for the Steam and Feedwater Rupture' 17 -Control System on level or differential pressure.
t 18- MR..LANNING: The main feedpump turbine .
t 19 is_not tripped?
i 20 LHR. O'CONNOR ..No. .The main feedpump-21 turbine-is"not. tripped,zbut.when the SteamLand~
22 .Feedwater Rupture Control System-actuates, the main .
23 turbine receives.a~ trip ~ signal; all right?. .When 7
' 24- the main tu rbine --t rips , also with the MSIVs closed,.
t
[
g .
e
! ACE FEDERAL. REPORTERS ~INC.'
l (202).347-3700 L .
I
! , .2 -- , ~ . - , .. . , . _ . _ . . . . _ , ._- 4 ~ --
- .. ~. . -- - - .- . . _ .. _ - . - - - . _ - - . .
i f
119 4
I
.1 there is no' steam for the main feedpump turbinos, .
i
(])-
2 scr th ey just wind down. They stay reset, but they
- i. 3 have no-steam, so they just coast to a stop.
i 4 4 There are two other valves not shown on 5 here,-on your si~nplified drawing. There is two ,
i I'm trying to
'6 steam ~ generator drain valves --
l
-7 remember 1the number of them -- 611 -- I can't 8 remember.:-- 603 and 611, and I don't know which, ;
9 .they also receive a closed signal. I'll w ri te it ,
10 this way,,but these may be reversed, the numbers.
11 It.will be on your real P&ID. They were added last ;
i
! 12 outage 1and this drawing has not been updated on ;
() '13 this simplified ~ drawing. But there is two'other
~
14 valves that are the drains off the steam generator e i 15 that 'also receive a closed signal.
16 In addition, the~ Steam and Feedwater ;
I
.17 Rupture Control System goes to our anticipatory f
1 :
18 reactor trip system, .so i f we get a Steam and i 1
19 Feedwater Rupture Control. trip, it'also goes over 20 and-opens control' rod drive breakers.
21 MR. BEARDr- What's that acronym?
22 MR..O'CONNOR: ARTS, ARTS system, ;
, 23 ' Anticipatory Reactor. Trip System. So it also goes i
24 to the ARTS.
(:1 I i'
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f
120 1 Now, this ARTS trip will come in fron any 2 of the four trips except for a loss of fore or aft 3 cooler pumps. In other words, any of these three 4 will cause an ARTS trip. The loss of fore does not --
5 MR. BEARD: That doesn't imply you don't want i 6 the trip to react.
7 MR. O'CONNOR: The trip has always 8 tripped on many other things. The purpose of the 9 ARTS system, which was added after TMI, was to shut 10 the reactor down on things like tenporature and 11 pressure pumps and thince like that.
12 Now, as a quick review, if we get a trip
(]) 13 of the Steam and Feedwater Rupture Control System 14 on level or DP, you cet full feedwater isolation, 15 full steam isolation, a turbine trip, a reactor 16 trip and auxiliary feedwater running to their own 17 stean generators. No. 1 from No. I and from No. 2 18 into No. 2. Any cuestions on that?
19 All right. Let's go back to a low 20 pressure trip. It's a little different. On each 21 of the main steamlines in your little drawing, you ,
22 will see an indication that says pressure switch.
f 23 There la actually twelve pressure switches on each 24 main steanline. It would be on the bottom part of ACE PEDERAL REPORTERS INC.
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121 1 your drawing a little thino that says PS. These go
( i 2 to the Steam and Feedwater Rupture Control Systen 3 for the trip logic and the low steam pressure block 4 logic.
4 5 Eight of the s w i t ch e s on each steamline 6 are used for trips. Four of them are used for 7 blocking functions on normal cool down s o you don't 8 get a trip.
9 Now, for the sake of discussion, it's 13 easiest to look at a particular point and break a 11 steamline off to show what happens on a low 12 pressurer all right? And let's say for the sake of r
(y j 13 discussion that I break off No. I steamline 14 upstream of this MSIV. In other words, for some 15 reason the 36-inch steamline broke in half and all 16 the steam is running out this hole.
17 The steam pressure in this steam 18 generator, instead of going down to the turbine, 19 all runs out the hole and the pressure immediately 20 sta rts to-decrease. All the steam - that was coming
- 21 out of this steam generator which was supplying
! 22 half.the steam to the main turbine, the turbino 23 valves are still in their same position, so the 24 steam going out of here is now feeding a hole twico ACE FEDERAL REPORTERS INC.-
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122 1 as big as it used to be. So the pressure in this 2 stean generator also drops. And what happens is 3 hoth steam generators blow down to less than 612 4 pounds. Does that make nonse to everybody, why 5 that happens?
6 MR. BEARD: What's normal system pressure?
7 MR. O'CONNOR: Normally system pressure 8 is about 920 in the steam generators and 870 on the 9 turbine header.
10 Now, as soon as the Steam and Feedwater 11 Rupture Control System trips, the first thing it 12 does is cause a full isolation, just like we talked
(]) 13 about before. Main steam isolates exactly the same 14 way. In other words, the MSIV 101 and 100 go shut, 15 the by-pass 101-1, 100-1 go shut. The a t n o s ph e r i c 16 vent valves 11B and 11A, the steam generator drains 17 394, 375 all go closed. We will skip Aux Feedwate r 18 for a second.
19 On the feedwater side, the same valves 20 that went shut before go shut now: 780, 6B, 7B, 21 612, on the other side 779, 7A, 6A and 601. So 22 right now we are sitting there with steam fully 23 isolated.and feed fully isolated. And we haven't 24 talked about Aux Feedwater yet. Does everybody 7-~)
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123 1 underetand that? So steam is isolated, feed is ,
'- 2 isolated.
3 Now, when the HSIVs go closed, what's 4 going to happen in the pressure in this steam 5 generator? It turns right around and comes back up 6 because these bottle up while there is still steam 7 in the generator. The HSIVs close in less than l 8 five seconds.
9 So with these closed, that is repressurized 10 immediately. This steam generator however doesn't.
11 It still has a hole in it. '
12 HR. DELL: It repressurizes if the RCS is
() 13 high enough to repressurize it. But if the cool 14 down has caused its pressure to drop to 612 it 15 won't.
16 HR. O'CONNOR: Our analysis is it will 17 pressurize above 612 based on the time SR senses it 18 and establishes it. It will pressurize above 612.
19 You are right thouch, later if it would continue to 20 blow on down, obviously you can't repressurize or '
21 if you blow all'the water out of it first, but our 22 analysis shows that this occurs in a time frame 23 that that will repressurize.
w 24 Now, this steam generator repressurizes
{d ACE'PEDERAL REPORTERS INC. !
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124 1 above the trip setpoint, so it's the good steam !
O(~x 2 generator. The Steam and Feedwater Rupture Control 3 logic senses this steam generator repressurizing 4 and lines up both Aux Feed pumps to steam f rom that 5 one and feed that one.
6 MR. BEARD: Hold it. Point of 7 clarification: In there actually a network that 8 senses the return to pressure and identifies one 9 steam generator as being good versus logic that 10 really says the other one is bad so -- or one is 11 bad so go to the other one?
12 MR. O'CONNOR: Okay. The network that in
() 13 used is the same pressure switches that sense the 14 low pressure now clear.
15 MR. BEARD: They are self-resetting then?
16 MR. O'CONNOR: Yes. In othe r worda, the 17 pressure switch is tripped, the pressure switch is 18 reset. That's all it'in, and it senses this steam 19 generator has pressure now and this one does not.
20 MR. BEARD: All right. Is the logic such 21 that it will really go to the one for which 22 pressure has returned?
23 MR. O'CONNOR: Yes.
(~g' 24 MR. BEARD: Or will it just go anyway
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125 1 from one which there is no pressure?
7-
\
2 MR. O'CONNOR: It will ao to the one that 3 returns. If neither return, then it requires 4 action of the operator.
5 MR. ROSSI: What if the break wero ,
6 downstream of the MSIVs and so both return? ,
7 MR. O'CONNOR: Car I get to that a f te r we 8 finish this one?
9 MR. BEARD: Let me stay on this first one 10 first. This morning or some time prior to noon we 11 had a discussion of what took place during this ,
12 event and how th e plant responc'd and et entera. ;
() 13 And I don't even remember who the gentleman was, 14 but someone explained to us that the Rupture 15 Control System senses a loss rf pressure on both of "
16 them during this event, because there was a 17 manually inputed actuation, because neither '
18 returned for at least a few seconds, and because of 19 that it did all the switch-overs as if both 20 channels were trying to assume the other oteam :
21 generator was good.
22 _And so I raise the question then about ,
23 how the system actually works versus the theory of {
24 how you want it to work, and I have got a little ACE PEDERAL REPORTERS INC.
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a 126 !
1 different responno between-there and now. And
'\-] 2 that's why I'm puzzled.
3 HR. O'CONNOR: The reason the system 4 responded differently is the two buttons the 5 operator pushed woro the two channels for low steam 6 pressure for both steam generators, and what it did 7 based on just the two he pushed going to the output 8 logic was cross-connect the Aux Feed pumps such i
9 that 106-A opened and 10 7 opened.
10 You have to get into the logic drawing 11 and see the two buttons he pushed and where they 12 onter the system. That's not like the pressure
() 13 switchen picking up. It's not the same.
14 HR. BEARD: In other words, the way the 15 system, the Rupture Control System responds on the 16 manual input may be a little different from the way 17 it would respond for a hypothesized steamline break?
18 HR. O'CONNOR: Right.
19 HR. BELL: Is it f air to say that the two ,
20 buttons are downstream, the pressure switch contact 21 inputa?
22 HR. O'CONNOR: Say that again.
23 HR. BELL: The two push buttons aro
- 24 downstream, the' pressure switch inputs, and because v
ACE PEDERAL REPORTERS INC.
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127 1 they are pushed they could never see the pressure
[)
2 switches were reset?
3 HR. O'CONNOR: They go directly to the 4 output logic.
5 HR. DEARD: I f we disregard this one area 6 I was questioning in, still the output of the 7 Rupture Control System, the effect is it senses 8 steam generator is kaput and therefore tries to 9 switch over to what is presumed to be a good steam 10 generator even though th e signals to it indicate it 11 may not be good. You see my dilemma?
12 HR. O'CONNOR: No. I'm a little --
() 13 HR. SHAFER: What you need is a steanline 14 break on Steam Oenerator 2 same as this to get the 15 same effect that the operator gave.
16 HR. O'CONNOR: Except if he would have 17 pushed all four low pressure buttons, then it would 18 have done what you wanted it to do. It would 19 sirulate a double break here.
20 HR. HEARD: We are cetting more into the 21 event than understanding the system, but I was a 22 little confused as to the way the syste m work n.
23 HR. MYERS: Bill, if you would, the key 24 idea that didn't get across was there is a
)
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128 1 difference, the system th i nk s differently i f you 2 only push the top two than if you push all four of 3 the tcp ones.
4 MR. O'CONNOR: That's.what I was going to 5 get to. The operator pushed these two buttons, and 6 the way'-- the channels go to different valves and
- 7 the combination that he pushed allowed the cross-over 8 valves to open.
9 HR. ROSSI: But not the Aux Feed valves.
10 MR. O'CONNOR: Right. It shut 599 and 11 608 thouch.
12 MR. MYERS: Now, if you pushed all four,
(]) 13 the cross-over wouldn't have opened.
14 MR. O'CONNOR: Would not have opened. If 15 he would have gone over all, the cross-overs would 16 have stayed closed too.
17 MR. ROSSI: Then all of the Aux Feed 18 would have been --
on both steam side and --
19 HR. O'CONNOR: Steam side, everything, 20 all the valves we just talked about would have been 21 closed if that occurred.
22 MR. DELL: Let's get back to normal a 23 minute. We got a break in No. 1 -- let's look at 24 the water side. That steam nide is not that hard.
ACE FEDERAL REPORTERS INC.
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h 129 1 MR. O'CONNOR: All richt. Does everybody 2 understands why this repressurized and how it lines 3 up the steam to stenmoff-the good one? )
4 MR. BELL: Yeah. l 1
5 MR. O'CONNOR: Let's go to the water side. i 6 We haven't' finished it yet. The water side will 7 line up to^ feed the good steam generator also. In ;
8 other words,. Aux Feedpump one will come down j 9 th rou gh 3869 and 599 to Steam Generator 2, and the 10 Aux Feed 2 will line up to feed Steam Oenerator 2 11 through 3872. I 12 Now, the only thing is low pressure -
() 13 closed 599 and 608 when both of them went less than [
14 612. Someth'ing h as to open them'back up. When f i
15 this steam generator repressurized and cleared the ;
16 . low pressure trip immediately-behino it with the
~
i 17 MSIV shut, there is.a DP trip that comes in because ;
18 the feedpumps went away and.a low level trip 19 because no' water is going in. f 20 So those trips 1 subsequently come'in i
21 within a second or so-to allow the system to :
22 realign andsreopen the good steam generator
?
l 23 -isolation valve, 599 or 600. ;
- g 24 MR._ROSSI
- ~ But.only-for the good one. .
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130 1 MR. O'CONNOR: Right. Only the side that
.repressurized.
2 3 ~MR. ROSSIt' So for the case you described, 4 608 stays. closed. 599 --
5 MR. O'CONNOR:- Yes, sir. I f both o f them 6 repressurized, then'both of'these would reopen 7 automatically dueLto the low level or the DP trip 8 coming in.
9 MR. BELL: But since we had two erroneous 10 low: pressure. signals, both 608'and 599 remained 11 closed?
'12 MR. O'CONNOR: . Yeah. .Until they undid
() 13 the low pressure-and pushed.the: low-level, they 14 stuck closed, bu't they wereigetting an open signal.
15 MR. BELL: There'was pushed the low level 16 actuation?-
17 MR. O'CONNOR: Yes.
18 MR. ROSSI- When you pushed the buttons, 11 9 the pressure,just being high didn't autonatically ;
20 clear it. He had to clear it nanually. [
i 21 MR. O'CONNOR: 'No ma tte r wha t the i
22 : pressure was in the steam generators, you were j 23 telling the' system.it was' low. !
.. 2 <4 MR. ROSSI: And it stays low until he resets ,
1
} !
, ACE FEDERAL REPORTERS INC. j c (202) 347-3700 i i
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L 131 1 something?
7 kI 2 HR. O'CONNOR: It could have gone to 3 wherever it wanted, and as long as it was teld that 4 it had low pressure by the operator, it was going 5 to stay in that condition.
6 HR. DEARD: So let me see if I cot this 7 straight. When he pushed the two buttons, that low 0 pressure caused 608 and 599 to close.
9 HR. O'CONNOR: Yep.
4 10 HR. BEARD: And had it been a real thing
- 11 rather than -- I mean, an autenatic' thing versus 12 manual and Steam Generator 2 had been good, its
,~,
t
) 13 pressure would have come back up, which would have 14 subsequently caused 599 to reopen?
15 MR. O'CONNOR: Based on another trip 1
16 coming in, a DP or a low level.
17 MR. DEARD: Well, I was thinkine just to 19 return to pressure point.
19 1H R . O'CONNOR: That will not reposition 20 any valves. Just returning to pressure does 21 nothing other than clear the low pressure trip. It 22 does not reposition any valves. Another trip nust 23 he present to reposition valves.
24 MR. BEARD: I see. They stay isolated.
ACE FEDERAL REPORTERS INC.
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132 1 MR. O'CONNOR: Yes.
(i
' 2 MR. BEARD: So the valves would have both 3 stayed in the closed position had the operator not l
4 taken subsequent action to undue what he had done? -
5 MR. O'CONNOR: Yes. If he had never 6 unblocked the low pre'asure trip or undone that trip, 7 they would have stayed shut.
8 MR. BEARD: All right. Good.
9 MR. O'CONNOR: Just his undoing that, the 10 level trip came up, was in already, and it would 11 have opened them anyhow, even if he hadn't pushed 12 low level.
( )) 13 MR. DEARD: And during the event, I don't 14 uant to get too nuch into it, he did go throuch 15 that sequence and the valvo should have opened.
16 Dut part of the event was they didn't.
17 MR. O'CONNOR: Right.
18 MR. BEARD: Okay. Thank you.
19 MR. O'CONNOR: Another thing, keep in 20 mind -- I didn't bring this out yet. Pressure trip 21 overridos all trips. Low pressure supersedes any 22 other trip that's in.
23 In_other words, you could have all the rg 24 other three trips present and you give it a low
'u)
ACE PEDERAL REPORTERS INC.
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133 I I pressure, and it takes precedence. In othe r word s ,
-)
'> 2 it will isolate a stean leak first since that's the 3 nost serious, the overcooling.
4 Now, any questions on a steamline rupture?
5 If you go back through it the other way, we could 6 break the other steamline and do the same thing.
7 I f we break it downs t rea m, the only difference is 8 both of then will repressurize, and once they both 9 repressurize, as soon as the low level of their DP 10 comes in, each Aux Feed pump will realign to its 11 own stean generator instead of just this one since P
12 they are both good. Does that nake sense?
(,_) 13 MR. BEARD: So they don't stay in the 14 crisscrossed arrangment?
15 HR. O'CONNOR: No. Once you get -- if 16 both of them repressurize, the subsequent trip on 17 DP or level will realign them to their own steam 18 generator. All right?
19 Now, loss of forereactor cooler pumps in 20 very simple. It doesn't need to isolate feed, it 21 doesn't need to isolate steam. All it needs to do 22 is put auxiliary feedpumps on. So we pump water in 23 the top of the generator to promote' natural cire, !
24 so all the loss of forepunp does is open MS-106,
)
ACE PEDERAL REPORTERS INC. i (202) 347-3700 [
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134 1 MS-107. That's the normal steam supplies from 73 ;
e 2 their own steam generator and opens the discharge ,
3 valves to their own steam generators 3870 and 3872.
4 So the Aux Feed pumps just start on their 5 own sides, spray the water in the top of the steam 6 generator and promotes naturel circulation. That's 7 all that happens on the loss of forereactor.
8 -
MR. ROS SI : The Aux Feed pumps always 9 spray from above?
10 MR. O'CONNOR: Yes, sir. They can only 11 feed the top nozzles.
12 MR. DEARD: On Davis-Desse as compared to
() 13 other B & W plants, is it -- did the Davis-Besse 14 plant steam run hich --
15 MR. O'CONNOR: Yes.
16 MR. BEARD: -- or low? You have hiqh 17 stean levelr.
18 MR. O'CONNOR: For those of-you who 19 aren't familiar with other plants, our reactor sits 20 essentially at the bottom of the system. The hot 21 leg comes out and goes up into the steam generators 22 and the pumps come out the bottom, so our steam 23 generator sits above the reactors.
i l 73 24 We have what's called a raised loop plan.
L) l ACE PEDERAL REPORTERS INC.
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135 1 .The other B & W plants.if you transpose the steam b- 2 -generators down so they si t ' essent'ially alongside 3 -the reactor, that's a lower loop plant.
4 HR. BEARD: So you .have :the raised loop 5 steam generators, but you have the-low head high 6 ' pressure injection pumps?
7 MR. O'CONNOR: Yes.
8 MR. BEARD: So'that's the uniqueness?
9 MR. O'CONNOR: Yes. We need very little
~
10 water.in our steam generators to natural cire. We .
11 'can natural cire on' low level limits. We typically 12 or we automatically-control them-at about 46 inches,
.()' 13 which-is a.little bit above~our low-level limits, 14 but we'can natural cire justRfinod on low level 15 limits.
'16 MR. BEARD: Is that 357 17 MR. O'CONNOR: 35. .The other plants have 18 to raise.their level up to 50~ percent on the 19 operator range or' higher depending-on-the 20 conditions they-are in.
21 ~MR. BEARD: .Is Davis-Besse the only one 22 with the high;1 oops?
23 .MR. O'CONNOR:= A .s fa.r.asfI know, the only' 24 1 7 7'.
ACE FEDERAL REPORTERS INC.
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.x t-136 l' . MR. DEARD: This plant is unique in two
/~%
q,) '-
2 respects, raised steam generator loops and the low 3 . head pumps for high pressure safety injection.
4 HR. O'CONNOR: 'Yes.
l 5 HR. MYERS: Those are two of the areas.
6 M R '. BEARD: There may be more. I 7 MR. MYERS: I think makeup; separation i
8 from LPI/HPI is another area we are separate.
9 HR. O'CONNOR: They have three makeup 10 pumps, one makeup -- two HPIs -- they are all the ,
11 same. We have two makeup pumps and two HPI pumps.
12 MR. BEARD: -One of.the reasons this
() 13 ' tutorial session is.so important from where I ,
14 come from, I deal-with not only you folks and 15 ' Westinghouse plants, but I have got to be concerned
, 16 with-the Ranchos and e very thing else.- And it's
-1 7 very easy to get t h'e m ~ m i xe d up. And it's important 18 in this kind of a situation to try.to get;it 19 straight. .
20 'MR. O'CONNOR: I did not' give you a 21 drawing of the emergency core cooling system pumps.
22 MR. BEARD: I didn't need that.
23 MR. BELL: When you say_ low pressure /
,y 24 . high1 pressure pumps,.what is the' shut off?
- %)
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137 "1 MR.'O'CONNOR: The high pressure .
2 . injection shutoff heads is-1650, the low prescure .
3 injection-pumps is about 190 to 200 pounda.
i 4 MR. BELL . That'1650 is withiBWSI tech 5 section' pressure 7 6 MR. O'CONNOR: I f we have the-LPI
.7 discharge, we can get up ~to about'1850. Did that 8 adequately cover how the Steam and Feedwater 9 . Rupture l Control" System works and how the feed and
, .10 steam systems hook together for-that?
_Ill: MR. MYERS: JT, is that a'little better
-12 than Fred's?
[ -
13 M R '. ROSSI: I think he covered it' fairly 14 well. Wo may want to come.back1and ask some more 15 questions about'what-the.b'uttons do. The buttons l 16 are clearly-a significant -pa rt of the event.
4 17 MR.'O'CONNOR: One thing, if we can get E
18 -them a copy of the Steam and Feedwater. Control
, 19 panel, they are all explained in-the-back and there
'20 is a logic drawing back-there.
21 MR.-BEARD: F4neSnc has already suggested 22 1that's important fot k get.
23 MR. .O'CONNOR: It's.got a[little logic 24 network =and shows youJexactly what valves move when C< ..
~ ACE' FEDERAL-REPORTERS INC. !
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138 1 you push what buttons.
2 MR. BEARD: Can we cet that before we 3 leave today? Off the record.
4 (Discussion held off the record.)
5 MR. O'CONNOR: Now, what did you want to 6 do next?
7 MR. BELL: I would like to go home.
8 MR. ROWLES: We would like to get into 9 the list of equipment.
10 MR. BELL: Do you want him to terminate 11 .one thing and start another?
12 MR. O'CONNOR: I will be here tomorrow
- 13 and will be around here all day. I will make 14 myself available in this building.
15 (Thereupon, a recess was taken at 4:50 16 o' clock p.m.)
17 - - - - - -
18 19 20 21 22 23 24 ACE PEDERAL REPORTERS INC.
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