ML20129B080
| ML20129B080 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 07/09/1985 |
| From: | NRC COMMISSION (OCM) |
| To: | |
| References | |
| NUDOCS 8507290065 | |
| Download: ML20129B080 (52) | |
Text
s s
to pa O UNITED STATES NUCLEAR REGULATORY COMMISSION IN THE .\ FATTER OF: DOCKET NO: - M b DAVIS BESSE IllCIDEi1T
- (IliTERVIEW & f1EETIf1G)
(CLOSED)
Discuss Procedures For: Powering SUFP from the diesel
, >-.s generators; Placing the SUFP in service (manual actions) ;
(J Actions and time required to get a main feedpump in service following S FARCS, actuation.
LOCATION: OA!( HARBOR, OH PAGES: 1 - 43 DATE: July 9, 1985 O ACE-FEDERAL REPORTERS, INC.
OfficialReporters 444 North CaoitolStreet 8507290063 850709 6 Washington, D.C. 20001 PDR ADOCK 050 (202)347-3700 T
NATIONWIDE COVERACE
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UNITED STATES OF AMERICA -
NUCLEAR REGULATORY COMMISSION !
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TUESDAY, JULY.9, 1985 7
A -
A EDISM 8
'TO 9
10 DISCUSS PROCEDURES TOR:
- Powering SUFP Prom yj The Diesel Generators.
12
- Placing the SUFP In Service 13
'(Manual Actions g Actions and Time Required To Get-A Main Feedpump'In Service ~Following SFRCS' Actuation 16 17 NRC FACT-FINDING ~ MEMBERS PRESENT:-
18 ERNEST ROSSI.
.j9 J.,T., BEARD.
- LARRY BELL 20 TOLEDO EDISON MEMBERS'PRESENT:
21 MS. MacDONALD 22 MR. O'CONNOR
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7-9-Wal 3 1 (1:25 p.m.)
2 g R q g g g g 1_ g g g 3 MR. ROSSI: Let's go back on the record, then.
4 What we are going to do is to discuss -- we wanted to get 5 copies of some of the procedures and just talk about it a 6 little bit, and I guess the first one that is on the agenda 7 is the procedure for powering the startup feed pump from the 8 diesel generators.
9 Do you have.the procedures? I am more interested 10 in knowing that there is cne, and that it can be done than 11 actually getting a copy of it, but you may want a copy of it.;
12 f If one of you guys wants a copy.
13 MR. BELL: We may need those copies for a 14 record. I will leave that for you to decide, Dr. Rossi. l 15 A verbal description from Bill will give us --
16 MR. ROSSI: I just want to know, you know, that 17 there is one and basically what it has in it.
18 MR. O'CONNOR: I can go to the library and get !
19 a copy of it so I can have it out here, but the abnormal ,
20 procedure called degraded system buses, which describes in 21 detail how to_ power up either side from either diesel 22 generator, and it is also in the EP 1202-(1 there is a 23 section or two that power those essential buses which will 24 allow you to start the startup.
Aa-Feder 9 Reporters, Inc.
25 MR. ROSSI: Does it have the instructions on
.? \
. 7--19-Wal, J . 4 E 'l putting the startup feed pump onto --
2 MR. O'CONNOR: How to power up a particular 3 bus, and'then you turn the pump. It isn' t specific for the 4 startup feed pump. It just tells you how to power up D-2 5 bus from D-1 or C-1, and vice versa. The opposite bus.
6 It- isn' t specific to the startup feed p ump.
7 MR. ROSSI: Before we send him off to get the 8 procedure, let's be sure we really need it.
9 MR. BEARD : I was going to suggest that as 10 far - as for the record goes, it would'probably be sufficient 11 ~if we could just identify the procedure with its number 12 and title, and stop right there.
13 MR. ROSSI: Yeah, unless you people have some 14 reason to collect it.
15 MR. O'CONNOR: Actually, it is in two places.
'16 Similar instructions in EP 1202-01, our reactor trip, you 17 know, the big orange book, there is a section in there for 18 quick and dirty power and up the buses,' and also in the 19 AB 1203-28,- which is degraded system buses.
20 I think that .is the name of it.
.21 That has every: possible combination to take I 22 LNo.1 diesel and power up its side plus - the other- side,.
23 number 2 : diesel. powering it backwards _ over .to the other side, .
i 24 essential or non-essential buses so that we- can cross connect- ,
! . Am-Federd Repo,sers, Inc.
25 either way in the event that we .have two diesels or one - diesel, l'
E._. . _ . . _ _ ._ _ _ . - _ _ _ . . , . _ .. . .. ._
a 1 5
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~ 7-ll-Wal,.J 5 1 and we need to power up the other side.
2 It'also has all the appropriate precautions 3 - about what you can turn on so as you don' t overload - the 4 diesels. i 5 In other words, you obviously can' t turn on 6 both HPI pumps, and both LPI pumps and all that type of thing, 7 and it has your rack out breakers that you don't want to 8 start -- to prevent them from starting -- but that is all 9 addressed in the procedures.
10 .MR. DELL: Do you need those procedures to 11 refresh your memory?
12 MR. O'CONNOR: I'can probably tell you, if you 13 just want a drawing of how the system is laid out and show you 14 the major breakers to do it, but if you want to go through the ,
15 exact procedure, I would prefer to get the procedure.
16 MR. ROSSI: I am more interested in knowing that 17 you have one, and having some understanding.of.how it would be 18 used by the operators. -
19 . Like if you-had an event like - June 9 th, where 20 you had a loss of offsite power = also, what- would the operator.-
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21 had'done.in terms of referring to procedures or just having 22 memorized steps to put the startup- feed pump onto the diesels?
23 MR. O'CONNOR:- Had we lost -of fsite power on the 24 evening of June ' 9th, then when they went into their emergency _
Ass-FederJ Repo,ters. Inc.
25 Procedure, 1202-01, one of the first steps in' that procedure
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, 1 is verification of electrical power.
2 All right? And when you get to that box, you 3 don't proceed until you have power. Obviously, you can't I
4 do your other actions until you have power back, so they-5 have to verify that the diesels did start, that they came on 6 to the essential buses fi'rst of all, and they are powered up 7 normally.
8 Then, at the operator's discretion, he is allowed 9 to close the high breakers to power up the non-essential 10 4160 buses primarily to get his lights back on .
11 In other words the _ lighting from the station, 4
12 most of it com7s off the non-essential buses. There is some 13 of it essentially in' the control room and the vital areas.
14 But'to turn on like the turbine building and all the other 15 areas, he has to power up the non-essential 4160 buses, and 16 that is in 'the procedure to close AC 110 and AB 110 are the 17 two breaker numbers to power that up.
I i In that same section, the startup feed ptmp is 18 19 powered from the D2 bus, and he would have to, you know, power 20 .up D2 in order to start the startup.
21 So, that is addressed in the procedure.
- 22 MR.'ROSSI
- Go ahead.
23 MR. 2 ELL: When he closes the breaker'from'the
- 24 diesel generator bus back to the non-essential bus, are any Am-Federal Reporters, Inc.
n 25 relays tripped that he has to - reset before he is allowed to l-
e i 7-13-Wal, J. 7 f I shut that breaker?
2 MR. O'CONNOR: No. He can close it from the 3 control room.
4 MR. BELL: Assuming that the problem wasn't a 5 bus fault that took him down -- let's just assume a normal 6 under voltage condition on D-2 that would exist after loss 7 of offsite power.
8 REPORTER: Excuse me. Could you please let 9 one finish before the other talks.
10 MR. BELL: I said let's just assume a normal 11 loss of voltage on DC-- on D-2 that would be present after 12 a loss of offsite power.
13 MR. O'CONNOR: He would not have to manually 14 reset any relays to close that breaker. He could just walk 15 to the panel in the control room and close the breaker.
i 16 MR. BELL: I don' t know your distribution sys tem l 17 that well, but I would assum'e that you .would have things like 18 the condensate pumps and other non-vital pumps, those would l i
19 remain out of service even if that bus is re-energized?
i 20 MR. O'CONNOR: Yes. They automatically load !
21 shed when the bus goes dead. In other words, all their 22 breakers trip open except for the lighting breakers, which 23 stay close d,so that when he repowers the bus, lighting turns 24 itself right back on.
Am-Federal Reporters, Inc.
25 All of the other breakers on the bus automatically i
e i 7-14-Wal, J. 8 1 load shed.
2 So that he doesn' t have to worry about running 3 around the control room and turning off the condensate pumps 4 even though they wouldn't be running. He doesn't have to 5 open the breakers. They are automatically tripped.
6 MR. ROSSI: The primary coolant makeup pumps, it 7 is the same sort of situation with those. They are not 8 normally loaded onto the diesels automatically, ^is that 9 correct?
10 MR. O'CONNOR: That is not correct.
11 MR. ROSSI: Oh, they are normally loaded?
12 MR. O'CONNOR: The operating makeup pump -- in 13 other words, assume No. 1 pump was running before the loss 14 of offsite power, its breaker remains closed when the bus 15 de-energizes so that when'the diesel powers back up, it -
16 starts the makeup pump and the component cooling pump. That I 17 breaker also stays closed.
18 , So, the operator would not have to automatically 19 close the makeup pump breaker.
20 If the diesel start is delayed, though, in 21 other words, the procedure says that if the diesel didn't 22 automatically come on the bus, then prior to him loading the 23 bus -- in other words, powering it up from the diesel -- he 24 has to close the seal injection valve to ensure that it is Am-Federal Reporters, Inc.
25 wide open when that makeup pump starts, so there are
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7-15-Wal,'J. 9 L I instructions if the diesel start is delayed, that he closes 2 the seal injection valve before he re-energizes the 3 essential 4160 bus.
4 Now, the makeup pump does have an inner lock 5 such that if the -- if we get a LOCA condition in the middle 6 13f all of this where the pumps start sequencing on, like low 7 press'ure injection pumps and all that, there'is an inner lock 8 with the low pressure injection pump break'er that if it starts 9 from the S-fas it will trip the makeup pump breaker to 10 prevent diesel overloads with all the other LOCA equipment II starting.
I2 You could' start the pumps manually and not 13 overload the diesel, because you don't have everything else
- Id running, but once you start putting containment air blowers,
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15 and hydrogen dillution blowers, and recirc fans and all that 16 on the diesel, it would be overloaded.
17 So, in a LOCA condition, the-makeup pump breaker !
18 trips automatically.
I9 14R.'ROSSI: Okay. Now, that is the one makeup 20 . pump'that was -- that would be operating. The other makeup 21 pump --
22 MR. O'CONNOR: -- you would have toistart.
l 23 MR. ROSSI: . But he can do that, has procedures 24 for doing it.-
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25 MR.10'CONNOR: . Yes.
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' 1 7-16-Wal,-J.
-1 MR. BELL: One more question for clarification.
2 I assume that if we had a loss of offsite power on June 9th
- 3 'and th'e diesel had started at the 490 volt motor control 4 centers would have re-energized as soon as the diesel output 5 breaker closed, is that correct? !
6 MR. O'CONNOR: Only the essentials.
7 MR. BELL: Those are the ones I am talking
, 8 about.
9 ,
MR. O'CONNOR: The essential ones would auto-10 matically re-energize, yes. E-1 and F-1 bus. And their 11 -breakers stay closed just like the makeup, so that-when the 12
) diesel starts, they come back on.
' 13 - MR. BELL: So all the auxiliary feed water valves c
] 14 that are motor operated would have been energized as scon as j 15 the diesel generator --
I6 MR. O'CONNOR: The train 1 valves are-DC. They!
17 had-power regardless.
I I 18 MR. BELL: Yes, sir.
19 MR. O'CONNOR: And the train 2 valves are AC, 20 and they-would get power as soon as the disesel was powered 21 -up. Started.
i i 22 MR. ROSSI: Okay. That -is everything I had on 23 putting those twoocomponents, .or those components onto the 24 . diesels. Do you guys have anything more?
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. 25 Okay. The startup 'feedwater pump,Eplacing it in A y- (
e i 7-17-Wal, J. 11 1 service by opening the valves that had to be opened and 2 putting the fuses into the breaker control circuit, the re-3 is a procedure also for that?
4 MR. O'CONNOR: Yes, yes.
5 MR. ROSSI: And is that in 12 --
6 MR. O'CONNOR: It is in two places. EP 1202-01 7 gives instructions for putting the start up feed pump on.
8 The startup feed pump operating procedure also gives the 9 same instructions.
10 That is SP 110 -- I think it is 1106-24, but 11 I am not positive of the exact number. The startup feed pump j 12 operating procedure, though, wo 'ld give the specific 1" instructions, in addition to the emergency procedure.
14 MR. ROSSI: Now during the event when Steve 15 Fiesel, I guess, did that, he was relying on his knowledge 16 of the procedures and his training for doing it and not a j 17 l check off list or anything? -
i 18 MR. O'CONNOR: Yes. Hedidnothaveaprocedurel 19 with him. It is only four valves, and the valves are known >
i 20 by everyone. i 21 Can I go back to the diesel and startup pump for 22 a minute?
23 MR. ROSSI: Sure.
24 MR. O'CONNOR: We ran an acceptance test, or Am-Federal Reporters, Inc.
25 a special test last June to prove that we can do this and t
1 1
7-18-wal,--J, I actual start the startup pump from the diesel.
2 So there was a TP, touch procedure, that we 3 ran. We ran over some discussions with engineering over 4 feed water problems during the refueling, and they had requested 7
5 .us to actually line up and start the startup pump from a 6 diesel, so we did do that.
7 I can get the test procedure number if you need .
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8 it, but we did a test to show that we could do that.
9 MR. ROSSI: I don't see any reason to get the 10 procedure ,
11 MR. BELL: Would you see if my list of valves l 12 , is correct to replace this startup feed pump in service.
13 Suction valve.
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i 14 MR. O'CONNOR: Yes.
15 MR. BELL: Th'en the discharge valve?
, 16 MR. O'CONNOR: Yes.
! 17 MR. BELL: Just because of locations, he would 4 18 probably then rack in the pump -- excuse me -- install the 19 control keys for the circuit breaker, . and then he wotdd go 20 down to the pump and open up the cooling water inlet and 21 cooling water outlet? '
22 MR. O'CONNOR: Cooling water -inlet and outlet 23 are outside the pump. _None of the valves are inside the 24 pump.
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25 MR. BELL: I had a tour, but it has been a '
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13 7-19-Jon Wal I couple of weeks now. I forgot.
2 So you would have to open those four valves 3 plus install the control power fuses for the circuit breaker.
4 MR. O'CONNOR: Yes, sir.
5 MR. BELL: And the control power fuses are 6 only removed because the suction valve to that pump is closed?
7 MR. O'CONNOR: Yes, sir.
8 MR. BELL: And that is a self-imposed safety 9 precaution that is common with Toledo Edison practice?
10 MR. O'CONNOR: Yes, sir.
Il MR. ROSSI: Those fuses were in the cabinet 12 at the time of the event, or --
13 MR. O'CONNOR: Inside the cabinet. When you 14 open the cabinet doors, there is a little hook that is 15 specifically installed to hang the fuses on when you are !
16 removing the fuses. They are part of a fuse clip, that you !
17 pull it out, there is a little baker light clip with a l 18 few fuses in it. I 19 It has a ring for hanging them, and you just 20 hang them on the door inside so that they are always there.
End 7 21 ,
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- 8-1-SueWalshi MR. ROSSI: And that's where they were at the time 2 of the event?
3 MR. O'CONNOR: Yes.
4 MR. ROSSI: Okay. The next one was to get a few 5 more details on the nakeup flow, flow control valve during 6 the event as to what happened. l l
7 Now, one makeup pump would have been running at the l l
8 time of the event? !
i 9 MR. O'CONNOR: At the time of the trip.
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10 MR. ROSSI: Yeah, at the time of the trip. And it's' II our understanding that a second one was placed in operation.
12 MR. O'CONNOR: Yes, as part of the supplementary !
I 33 actions of the reactor trip procedure to start the makeup j 14 tank.
15 MR. ROSSI: Okay. Now, there is also a makeup 16 flow control valve that is operated by a pressurizer level? !
17 MR. O'CONNOR: Yes, sir. MU-32 is the valve number.:
18 MR. ROSSI: MU-32. And there is let down valve 19 which I guess he closed --
20 MR. O'CONNOR: Yes.
l 21 l
MR. ROSSI: -- as part of his normal procedure. i 22 MR. O'CONNOR: Yes.
I 23 MR. ROSSI: So he closed let down and then he had '
24 both makeup pumps running. The makeup flow control valve Am1MwW Reoruts, lm.
25 would of essentially been closed I assume because they had --
15
- 8-2-SueWalsh i during the time they had a high pressurizer level.
2 MR. O'CONNOR: Initially the valve would have 3 opened because the pressurizer level goes down when the 4 reactor trips and the initial cool down from 582 to 555.
5 When the plant started heating back up, once the plant got 6 above 582 again, now pressurizer has been restored to 200 7 i nches, at that point it would start closing the makeup control 8 valve, you kncw, orico you exceeded the 200 inches in pres-9 surizer.
10 So, frcm 582 to 592, that ten degrees banc, it j 11 would have closed itself. t i
12 MR. ROSSI: Okay. And there was not an attempt l i
13 at any time in the event to open 'it or preparations for feed 14 and bleed?
15 MR. O'CONNOR: No. Had we gone to feed and bleed 16 operations, the next step would have buen to open the high !
17 point vents, to open the PORV, open the makeup control valve i
18 and put the makeup pumps on. That is spelled out in the pro- l i
19 cedure. j l
20 But he did not open it at the time. All he would 21 have dcne was take the pressurizer solid had he begun feed-22 ing.
23 MR. BEARD: Excuse me, Bill. You went too fast 24 for me. Had he gone to PORV cooling, he would have opened Am-Fede,al Reporters, Inc.
25 the PORV --
' t 16
- 8-3-SueWalshi MR. O'CONNOR: Yes.
2 MR. BEARD: You would have opened the high point 3 v ent?
4 MR. O'CONNOR: Yes.
5 MR. BEARD: And what was it?
6 MR. O'CONNOR: Makeup control valve.
7 MR. BEARD: All right. Now, what does he have to 8 do to open that? Does that involve some reset or take it from 9 auto to manual?
10 MR. O'CONNOR: Take it to manual and let it open.
11 MR. BEARD: So, all he would have to do is really 12 take it out of automatic into manual and reopen.
13 And the procedures describe that step?
14 (Mr. O'Connor nodded in the af firmative.)
15 MR. ROSSI: Do you have anymore on those?
l 16 MR. BELL: Yes. I 17 MR. ROSSI: Go ahead.
18 MR. BELL: Is there a proportional interval control I'
19 on this MU-32?
20 MR. O'CONNOR: Yes.
21 MR. BELL: So it would modulate closed a little --
22 MR. O'CONNOR: Depending on the size of the error.
23 MR. BEARD: I guess earlier, Ernie, we had this 24 question about this makeup control level. And we also had w .en s n.pon us,inc.
25 a question about the piggyback thing. And I don't know whether
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- 8-4-SueWalshi Bill is the right one to ask more on that subject or not.
2 MR. ROSSI: Yeah, I think if you ask him if he 3 is not the right one, he will tell us.
4 MR. BEARD: Yeah. IIe is not bashful. Bill, 5 earlier we were talking about the emergency procedures used 6 during the event. And we were concentrating on this area of 7 the makeup valve with regard to makeup flow, PORV cooling.
8 And what we were trying to understand was if I 9 remember the emergency. procedure correctly that part of the 10 procedure that talks about opening the makeup flow valve is 11 part of one of the specific rules, and it's in fact a sub-l 12 part. I believe it's 2.4 of that specific rule, j 13 Okay. Then as a separate specific rule, if I 14 remember correctly, it talked about piggyback operation. So, 15 what we were trying to learn more about was, would an operator 16 typically be expected to tie all these loose pieces together i 17 at just this kind of a situation or is there some flexibility ,
18 that maybe one would and one wouldn't?
19 What would be a reasonable thing to -- in other 20 words, if you were in the Control Room and said: Okay, guys, 21 we are going to core cooling, and the fellow on the primary 22 side does his thing and the other people do their thing, 23 what would you expect from the average individual?
24 MR. O'CONNOR: I guess the answer to your question, Aes-Federal Reporte,s, Inc.
25 if the decision was made to go to core cooling then the Shift
18
- 8-5-SueWalshi Supervisor or the Assistant Shift Supervisor in the control 2 Room would have directed the actions of the reactor operator 3 in telling him to open the high point vents, open the PORV, 4 open the makeup cooling valve, make sure both makeup pumps 5 are running and he would actually go through those steps of 6 Section 6 of, you know, the overheating section.
7 The specific rules that you are talking about are 8 the makeup HPI throttling rules. In other words, if we are 9 in a LOCA and we are on makeup cooling or HPI cooling you are 10 not allowed to throttle makeup or HPI until those conditions 11 are met. And they are not just for overheating conditions.
I 12 In other words, the specific rule also is this primarily for 13 a LOCA condition where that is your cooling medium.
14 And you are not allowed to throttle until you have 15 other cooling in place, whether it be low pressure injection 16 running at greater than a thousand gallons a minute and I 17 ' pressurizer level reestablished, or you are not going to 18 break the vessel in pressure temperature limits.
l 19 So those rules, those specific rules, are establish '
i 20 ed for many other things other than overcooling. The makeup 21 specific rules are addressed such that if we have one of those 22 little LOCAs that does repressurize us that we don't throttle 23 makeup; in other words, it falls under the same rules as 24 high pressure injection throttling.
w edws: nepor w s inc.
25 You have to treat the makeup pump just like a
- 1 19
- 8-6-SueWalshi high pressure injection pump for the sake of throttling 2 criteria. So the specific rule is not just for overheating 3 specifically.
4 MR. BEARD: Okay. Well, I'm not too much interest-5 ed in the throttling aspect. I'm trying to focus on the --
6 taking the makeup valve out of automatic, putting it into 7 manual and then manually open it so that your makeup flow will 8 actually flow in.
9 MR. O'CONNOR: Uh-huh.
10 MR. BEARD: And my memory was that was a part of i
11 t he specific rule dealing with the throttling and not part !
l 12 of Section 6.
13 And, therefore, I have to question where they tie 14 it all together, 15 MR. O'CONNOR: I'm not sure I can answer what 16 you mean by tie it all together. It's their training. They f i
17 know that they have to open the makeup valve and the only l 18 way to open the makeup valve is to push it into manual and 19 let it open.
20 MR. BELL: Without all three of us relying on the 21 memory, why don't we just get 1202 and look at Section 6, 22 and I think we can answer the question. Maybe it would be 23 easier than everybody trying to recall it from memory.
24 Because the operator is allowed to use that. It's Am-Federal Reporters, Inc.
25 not an immediate action; he can have that open anyhow.
o; . *-
20
- 8-7-SueWalshi (Pause.)
2 MR. ROSSI: I think we are ready to go back on the 3 record now. So, Bill has the procedures and we were trying 4 to find out-specifically what the PORV cooling procedurds 5 require with respect to the makeup: flow control valve. And 6 then I think one of the next questions, at least that I'm 7 going to have, is what is specifically required and what 8 would be done in PORV cooling with respect to piggybacking 9 the HPI and LPI pumps.
10 MR. O'CONNOR: Okay. It's Section 6 for lack of 11 heat transfer enter sub-cool or saturated where it tells 12 you, establish makeup HPI cooling. The first step says:
13 Actuate and control makeup HPI per specific Rule 1 and 2.
I4 Specific' Rule 1 is actions for loss of adequate 15 subcooling margin. Specific Rule 2 is makeup HPI flow 16 initiation, throttling and termination.
17 This would direct the operator to get his makeup 18 or HPI pumps running and open the flow control valve which 19 would say_ start the second makeup pump, fully open MU 20 makeup control valve, shift the makeup pump suction to the 21 BWST and so on.
.22 MR. BEARD: Okay. So, the opening of-the flow 23 control valve if the ICS were to close is part of Specific 24 Rule 1 --
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25 MR. O'CONNOR: Yes.
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- 8-8-SueWalsh 1 MR. BEARD: -- under the inadequate and subcooling 2 margins.
3 MR. O'CONNOR: Yes.
4 MR. BEARD: And they understand they have to follow 5 that?
6 MR. O'CONNOR: Yes.
7 MR. BEARD: Okay.
8 MR. BELL: But the ICS doesn't control the makeup 9 flow control --
10 MR. O'CONNOR: Yes, the N&I.
11 MR. BELL: The N&I, that's right. It's a separate 12 non-nuclear instrumentation.
13 MR. BEARD: It's one of the unique ones, like the 14 PORV.
15 MR. ROSSI: Okay. Now, what about operation of 16 HPI and piggyback? Is that part of PORV cooling or would 17 that not be I art of it? ,
18 MR. O'CONNOR: It is not mandated to go to piggy-19 back. The operator may go to piggyback operation.
20 The only time we restrict him in piggyback operation 21 is in the case of a large break LOCA where we don't allc,w them 22 to go to piggyback because the safety analysis does -- would 23 not protect them in piggyback.
24 In all other cases, the operator may opt to use Am-Federsi Reporters, Inc.
25 piggyback operation to maintain his pressurizer level or his
o =a 22
'# 8-9-SueWalsh] RCS pressure. And that is Specific Rule 24.
2 MR. ROSSI: Okay. So the makeup, flow control 3 valve is -very specifically mandated by PORV cooling.
4 MR. O'CONNOR: Yes.
5 MR. ROSSI: And the piggyback operation isn't 6 specifically mandated but it would be an option --
7 MR. O'CONNOR: Yes, sir.
8 MR. ROSSI: --
if he chose to use it. Do you 9 have anymore on that?
10 MR. BELL: I don't.
11 MR. BEARD: I guess the long and the short of it is 12 that when you go to PORV cooling, you would expect both make-13 u p pumps be running, - makeup valve open --
14 MR. O'CONNOR:- Yes, sir.
15 MR. BEARD: -- piggyback is optional.
i 16 MR. O'CONNOR: Yes, sir. !
17 MR. BEARD: But HPI, both trains would be running. {
t 18 MR. O'CONNOR: Yes, sir. i i
-19 MR. BEARD: And on the bleed side, one of the 20 things I had forgotten about is not only is the PORV -- now, 21 the PORV, is-that told to be blocked open?
22 MR. O'CONNOR: It says open the PORV. And the only l 23 .way that you can keep it open is to take the. switch all the 24 way around. 'Otherwise, you will have to hold it. If you go
' A -Federal Reporwes, Inc.
25 to the locked open position it will stay.open.
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.t 23
- 8-10-SueWals) MR. BEARD: Well, what-I'm trying to understand, 2 Bill, simply is how does the operator know he has to hold 3 it open?
4 MR. O'CONNOR: It says to open it which means make 5 sure it's open.
6 MR. BEARD: Okay.
7 MR. O'CONNOR: Their training --
8 MR. BEARD: Okay.
9 MR. O'CONNOR: -- tells them that the valve has 10 to stay open.
11 MR. BEARD: Okay. No problem.
l 12 MR. O'CONNOR:. This switch was replaced after the ;
13 TMI. accident. .The origina) PORV control switch, you could !
14 not hold it open but you had to hold it. continuously. l i
15 :MR. BEARD: Okay. i 16 MR. O'CONNOR: So, this switch was added for that 17 reason. 4 i
13 MR. BEARD: Okay.- And then on the high point vent -f i I 19 MR. O'CONNOR: Yes.
20 MR. BEARD: -- where would that steam or water go?
21 MR. O'CONNOC i ight in the containment.
22 MR. BEARtc Lt. crying to visualize the flow path, j 23 .but it's basically exhausted to' containment?
24 LMR. O'CONNOR: Yes. Off the . top of the hot. legs Am-FWwd Reorwrs, lm. I 23 we have two solenoid valves in series with iust a little tail at-
~
1 . , a 24 48-11-SueWalshi -pipe.
2 MR. BEARD: Yeah.
3 MR. O'CONNOR: And that exhausts right into the 4 containment. At the high point vents there is a -- 1 believe 5 it's a three-quarter or one inch line. I don't remember the 6 exact size, off both hot legs.
7 We also open the pressurizer vent path. So, in 8 addition'to the PORV we open the high_ point vents and the 9 pressurizer vent. So, we essentially have four holes.
10 MR. BEARD: So, _the exhaust as far as the pres-11 s urizer goes though is more than just the PORV's capacity, !
}
12 it's also the high point vent on the pressurizer. i 13 MR. O'CONNOR: And the pressurizer vent. We open i
14 four valves.
15 MR. BEARD: The pressurizer vent? l 16 MR. O'CONNOR: Yes.
1 17 MR. ROSSI: The high point vents are where? !
18 MR. O'CONNOR: ' Physically? j 19 MR. ROSSI: Yeah.
I 20 MR. O'CONNOR: ~ Right on top of the hot legs.
21 MR. ROSSI: Okay. The high point vents are on 22 top of the hot legs.
23 MR. BEARD: All right.- So, you open the PORV --
24 MR. O'CONNOR: Yes.
Amfederal Floporters, Inc.
25 MR. BEARD: And then you open three high point vents,
c' . .'
25
- 8-12-SueWalsH one on top cf each loop and one on the pressurizer?
~2 MR. O'CONNOR: Yes.
3 MR. BEARD: That's what I mean. We just tangled 4 up on the words.
5 MR. O'CONNOR: Yes.. So, there is actually four 6 outlet flow paths.
t 7 MR. BEARD: Right.
8 MR. O'CONNOR: That's just to give us more capacity .
9 going out to insure that we can put enough volume through it 10 to insure adequate-cooling.
I II MR. BEARD: I think that-the people that are doing '
12 analysis for this event have raised questions about the flow 3 1
-13 _ capacity of the PORV. So,,this is very relevant information.
I4 14R. O'CONNOR: Uh-huh.
I 15 '
MR. ROSSI: Okay. The next'-- these are all loose t
16 ends that we are -- go ahead.
17 MR. BELL: Do the makeup pumps receive an automatic i 18 start signal if engineering safety features is initiated?
19 MR. O'CONNOR: No.
i 20 MR. ROSSI: The next question is to ask'about the 21 ma'in feedwater pumps and:what, if'anything, could have been 22 done on June 9th ' to return them to service, how -long would i 23 .that take?
24 Am-Federal Reporters, Inc.
MR. O'CONNOR:. To return the main feedwater pumps 25 to service after that event' would haveLbeen a timely. affair,
+-
. ?
26
)8-13-SueWalsh i because with the main steam isolation valves closed-that shuts 2 off the main steam to auxiliary steam reducing station which 3 -shuts off the bland steam.to the' steam seals on the turbines.
4 The condensor vacuum then goes away and in order 5 to restart the main-feed pumps we have to start up the boiler, 6 reestablish steam seals, start up the air injectors and the 7 steam hoggers and draw vacuum into the condensor again.
8 MR. ROSSI: So, you can't run the main feedwater ,
i i
9 -pumps without again establishing vacuum? )
10 MR. O'CONNOR: We cannot run the main feed pumps f I
11 'without vacuum.
12 MR. ROSSI: How. long would you think that would j i
e 13 have taken?
14 MR. O'CONNOR: We could have gotten back into the i
15 point where we could run a main feed pump in probably forty- i 16 five minutes to an hour. That would not be normal full l 17 vacuum of the condensor but I don't need normal full vacuum 18 to run the main feed pumps. I only need twelve and a half 19 inches.
20 So, to get to that point we probably~could have 21 made it in,-my guess, forty-five minutes to an hour.
22 MR. BEARD: Bill, when you.say-forty-five minutes 23 to an hour, are you saying that on a routine-plant situation 24 that operation normally would take forty-five minutes to an Ass-Federe! Reporters, Inc.
- 25 hour or during an emergency the expedited ' version. of that
- . ?
l i
27
- 8-14-SueWalsh time would be forty-five minutes?
2 MR. O'CONNOR: Routinely we would draw the 3
condensor down to a couple of inches before we roll anything.
4 I'm saying I could draw it down to just the twelve and a 5 h alf inches that I need to reset the feed pumps and roll.
6 And, you know, maybe in even a little less time 7 than the forty-five minutes. !
l 8 MR. BEARD: Okay. !
9 MR. O'CONNOR: But to get to that point it takes l 10 about that long just to get vacuum to that point.
11 MR. ROSSI: Would you have had to open the main i 12 steam line isolation valves to do that, or would you have '
13 gone to bypass valves? i Id MR. O'CONNOR: I could have run the boiler onto !
1 15 the main feed pump.
i 16 MR. ROSSI: The auxiliary boiler?
17 MR. O'CONNOR: Yes, sir.
18 MR. ROSSI: Okay. So, your forty-five minutes to 19 an hour assumes the use of the auxiliary boiler?
20 MR. O'CONNOR: Yes, sir.
21 MR. ROSSI: What was the status of it?
22 MR. O'CONNOR: It was running within five or six 23 minutes of the reactor trip.
24 we. der : seponers, Inc.
MR. ROSSI: Was it running before the reactor trip, 25 too?
28 148-15-SueWalsh MR. O'CONNOR: No, sir.
2 MR. ROSSI: Okay. So, it can be started up very 3 quickly?
4 MR. O'CONNOR: That is-one of the actions in the 5 post-trip procedure, to get the boiler running, to get steam 6 seals on as soon as you can.
t 7 MR. BEARD: Do you know if it was performing 2
!1 8 reasonably normally during the event, or whether they had 9 difficulties with it?
10 MR. O'CONNOR: They had some difficulty with it 11 in that -- I don't remember whether it was the feed flow 12 controller or the steam flow controller. One of the two i
13 inputs to the feed valve, they had to run the feed valve in 1
! 14 manual . - But that's not any big deal 15 But other than that, the boiler was operating.
16 MR. ROSSI: Okay. But before the trip it was t
17 not in operation?
I 18 MR. O'CONNOR: It was in its normal stand-by l t
19 condition which the boiler is hot but it has anywhere between 20 50 and 200 pounds pressure, and what we do is firo up'the 21 boiler in the morning and take it up to 235 pounds, its 22 normal pressure, shut the boiler down, then over the day it 23 just tends to drift down to 50 or 60 pounds, then we fire it 24 back up again.
! Ass-Federal Reporiets, Inc.
25 So, we keep the boiler hot, ready to go.- And to get
r L
e- ,1 29
- 8-16-SueWalsh from 50 pounds to 235' pounds is only a matter of a couple 2 of minutes. Once you have got a fire in the boiler you just 3 rtm the _ oil valve and air controllers open and you will re-4 pressurize it in just. a matter. of minutes.
5 MR.-BELL: May I'see if I've got these steps listed 6 correctly?. First, you fire your auxiliary boiler, then you 7 establish sealing steam to the main turbine and the feed pump 8 turbines, then you start 'your mechanical hoggers --
9 MR. O'CONNOR: And steam hogger and air injectors. I l
-10 MR. BELL: And steam hogger and air injectors and I i
11 then when the vacuum gets down to twelve --
12 MR. O'CONNOR: Twelve and a half inches is what i
I 13 I --
! 14 MR. BELL: Absolute? ;
i 15 MR. O'CONNOR: Yes.
' I6 MR. BELL: .Okay.- Eighteen inches of vacuum.
! 17 MR. O'CONNOR: It was hard for me to get out of 18 that mode, too, f
19 - (Laughte r . ) ;
20 Then, that's where the feed pump trip clears on 21 vacuum.
i 22 MR. BELL: Then, you would have to roll a turbine 23 ,and that's going to take you --
24
! Asessesres neporters, Inc.
MR. O'CONNOR: No_ time at all. Reset, roll. The 25 GEiturbine'doesn't= require warm-up. They can-roll it right to l
l
,, - t , ,r--e- , . -
30
- 8-17-SueWalshi . full speed. Now, in a. dire emergency I could have reset 2 - that feed pump before the twelve and a half inches. There 3
is a- vacuum override on that feed pump so that I- could have :
4 reset it with even less vacuum than-the twelve and a half-5 and run it to the condensor.
- 6
-Obviously it's not as efficient as when you have 7 full vacuum, but the feed pump could have been rolled before 8
even clearing the trip.
9 MR. ROSSI: 'How fast could you have done that? I 10 mean, if you had done that how fast could they have_ gotten ,
11 '
the main feed pump back if you-had -- l 12 MR. O'CONNOR: It's hard to guess. I would say is
- ~
naybe a half an hour.
14 15 I0
. END #8 Simons f1ws 37 18 19 20 21 l
9 23 i
! 24 m neporiers, Inc.
25 I
{
l
31 Sim 9 j but..ROSSJr But even a half an hour you think to 2 do that?
7 3 MR. O'CONNOR: Yes.
4 :MRI BELL:, But, again, this'is something that is 4
5 not directed in the procedures. This is something that you 6 know because of your training and experience at Davis-Besse.
, 7 MR. O'CONNOR: Yes.
g MR.. BEARD: -And other places.
9 MR. ' O' CONNOR $ Yes.
?
10 .
MR. BEARD: Bill, there has been some discussion 11 about the possibility of reopening the main steam valves and 12 using some.of that steam to get the main feed pumps running.
13 Could you talk a little bit about that approach to getting 1
-14 the main feed- pumps back and maybe compare the two?
15 MR. O' CONNOR: In parallel with starting up the 16 boiler and getting. vacuum back in the condenser,.t.he main
- 17 steam isolation valve bypasses would be opened and start 18 warming up the steam lines. You have to get less than a
! -19 250 pound differential pressure across the MSIVs to open them 20 by procedures. So the~ operators would have been also in 21 -parallel to starting up the boiler, you know, had they needed t
.22 it, and gone to warming.up the steam lines to be able to run 23 the feed pumps also.
24 LI would have said they would have reached the two I ' Ac r.d.ros n. porters, tw , ..
! ~25 points at about the . same time, and it takes usually about
s?l.- .
i
, 32
.: Sim9-2 j a half an hour or so to, warm up the downstream' side of the 2 [ steam' lines to get them pressurized up to allow the MSIV to ,
3 . pen, in other words,'to get that DP within the specification.
4 MR. BEARD: So'you have'to be concerned about.the 5 DP across the isolation valve:ande.you have to beJconcerned..abou t 6 -warming and pressurizing the pipes so you: don't straighten 7 it out.
. 8 10R. O'CONNOR: -Yes.
9 MR. BEARD: And what about exhaust on the steam?
10 Do you'have-to have any. vacuum source associated with that?.
ij ;MR. O'CONNOR: You cannnot start warming up.the
! 12 steam line until you have some vacuum in the condenser because-13 the traps that come off of the steam line' stub header drains-14 .go to the condenser. So if you would try and warm it up I '15 before you had some. vacuum, you'know, it would just cause 16 . severe water hammer.
17 MR. BEARD: So since these-parallel paths sort of i 18 overlap and intermingle with each other, don't they, in 19 terms of re-establishing vacuum?
20 .MR. O'CONNOR: -Yes. -You have to have-vacuum, in.
2 21 'other-words,.to' allow the traps,'youchavebto dumpztheir 22 water back'to the condenser.
23 MR. BEARD: Okay. But Ifthink you would end up i'
J24 at1 basically ~ the same point with two essentially parallel'.
. Ac.F.d.r.1 n. port.r , sac.
I;. 25 . paths.
~
4 l-l l ?i '
- 33 i
Sim9-3 )
MR. O'CONNOR: Yes. I 2
MR. ROSSI: If you were'to use the vacuum override 3
n the main feed pump to get it back in service, you indicated 4 that even that would take a half an hour. What would be 5
the limiting thing in terms of time if that were done?
6 MR. O'CONNOR: You would still have to have enough 7 vacuum to exhaust the feed pump to a vacuum, and I am not 8 Positive what that actual number is.or whether I could have 9 gotten enough capacity out of that feed pump turbine with 10 vacuum being very, very low. To get the capacity or 11 efficiency I need to pump enough water with the boilder. In 12 ther words, the boiler is only rated at 175,000 pounds per 13 hour and with the back pressure on that turbine high enough, ja I might not have been able to get enough out of the main 15 feed pump to even pump any water until I got, you know, a 16 decent vacuum. And, like I say, I have never done it.
j7 MR. RCSSI: And you have no procedure.
18 MR. O'CONNOR: And I have no procedure for that.
j9 We are required to have a name plate vacuum by the outbreak 20 procedure.
21 MR. BELL: Even had you been able to open the 22 main steam isolation valves,,do you think you would have 23 enough decay heat and pump heat to run that main feed pump 24 for any significant_ period of time?
Ace-Federal Reporters, lac.
25 MR. O'CONNOR: Not if we had not put any water in
F 34 Sim 9-4 it there wasn't enough.
1 2 MR. BELL: You mean there was not enough steam in 3 the steam generators even-if'you could have equalized across 4 the MSIVs.
5 MR. O'CONNOR: There would have had to have been 6 some water in there and enough to get it going.
7 MR. BELL: That is right.
8 MR. BEARD: Do you think there would be enough to 9 even start it? You know, the question has come up ofecould-10 you restart an aux feed from a bottled up condition in a dried 11 out steam . generator. And the answer to that, as I understand 12 it, was there probably a gracious plenty for an aux feed pump, 13 but is there anywhere near enough for the main feed?
14 MR. O' CONNOR: My personal opinion is that in a 15 dried out condition I rather doubt that there would be enough 16 there to get a main feed pump up to speed, but that is just 17 an opinion, you know, not having ever tried it.
18 MR. ROSSI: What about the condensate pumps, could 19 they have beca used in any way to pump through'the main feed 20 pumps?
21 MR. O'CONNOR: We do not have a line up to take our 22 condensate pumps through our main feed pumps. Some plants have 23 a direct discharge of their pumps into the main feed pumps.
24 Ours go to aerator. .
Ace-Federal Reporters, Inc.
25 MR. ROSSIs And there is no way to bypass the l
L___.
35 Sim 9-5 1 aerator?
2 MR. O'CONNOR: No, sir.
3 MR. BELL: I am'through on the main feed pumps.
4 What is your next category, or is that the completion of the 5 category?
6 Oh, I wanted to ask another ,ast general question 7 if we are through with the items on the agenda while Bill 8 is here. He is a valuable resource.
9 MR. ROSSI= Go nhead.
10 MR. BELL: Bill, I am curious of your knowledge 11 and experience on the MSIVs in terms of the automatic safety 12 signals that they get.
13 Do you remember, neglecting-the safety features 14 actuation system, neglect that one for a moment and talk 15 only about the SFRCS~ and what combination of signals it 16 takes to close one of those valves. Do you happen to remember?
17 MR. O ' CONNOR: I will draw a little picture.
18 MR. BELL: I understand there is something like 19 three solenoids and it is a little complicated.
20 MR. O'CONNOR: There are five. If you want, :I can 21 go and get an official drawing.- ..
22 MR. BELL: No, no. We.have got some of the technical 23 people looking at the details and I am really asking you 24 from an operational experience.
Ace-Federal Reporters, Inc.
25 (Mr. O'Connor proceeds to draw.)
36 MR.;O'CONNOR: There are five solenoid valves associated with the main steam isolation valves. They are 2 >
labeled A, B, C, D and E.
3 Let's talk about the main steam isolation valve 4
on line one, and that way we can talk about which specific 5
channels go to which.
6 The A and the B solenoids come from the SFRCS 7
channel one and,SFRCS channel 3.
8 MR. BELL: All right. So the A selenoid is the 9
channel one SFRCS No. 1, and the B selenoid is SFRCS No. 3?
10 MR. O'CONNOR: Yes. The A is also S-FASS one and 11 the B is S-FASS 3. Two contacts will pick up the relay for 12 the A solenoid, and two will also get the B.
13 The C, D and E, and I don't remember whether the 14' C and D are lumped together, or the D and E, but ---
15 MR. BEARD: I think maybe C and D are together.
16 MR. ROSSI: Yes,-we were told that this morning.
17 MR. O'CONNOR: This would be SFRCS channel two and 18 this would be ---
19 MR. BEARD: The two that are left togeth're would 20 be channel two.
21 MR. O'CONNOR: Yes. And SFRCS channel four for this 22 one.
23 Now you have to look at the solenoids go to air 24 Ac+ Federal Repor'ers, lac. operated valaves. In other words, these solenoids actually 25
. 37 Sim 9-7 1 line up air to air operated valves, and by porting the air 2 through different paths, you either line it up to the top or 3 the bottom of the operating piston. Obviously if you line 4 it up to the bottom it opens the valve is all of the solenoids 5 are energized, and if you line it up to the bottom of the 6 valve, or the top of the valve, it would shut it in addition 7 to venting the bottom.
8 Now if A and B de-energize, that alone will close 9 the MSIF.
10 MR. BEARD: A and B would be SFRCS channels one 11 and three?
12 MR. O'CONNOR: One and three would close main 13 steam line one MSIF.
14 MR. ROSSI: That is logic channels one and three.
15 MR. BEARD: Logic channels one and three would 16 constitute actuation channel No. 1.
17 MR. O'CONNOR: Yes.
18 MR. BEARD: So if that goes right there, that is 19 sufficient to close the valve?
20 MR. O'CONNOR: To close that valve, yes. Channel 21 two gets the C and D selenoids and channel four gets the E.
22 So the opposite side SPRCS channels will also close the 23 No. I side MSIV.
24 MR. BEARD: Okay. So I assume what you are saying AoFederal Reporters, Inc.
25 is that neglecting A and B for a minute, which by themselves
- . . _. _ , , . . . ~ __ _ . - _-
q ,
4
=
- ^
- - , 38
- Sim 9 1 .are sufficient to close it.
2 MR. O'CONNOR: Yes, 3 .MR. BEARD: And if C, D and E are all three f
4 de-energized, then that'isJalso.cufficient to close it.
5 MR. O'CONNOR: Yes.
0 . MR. BEARD: And that would be~ actuation ofichannel'.
7 two, the SFRCS.
8 'MR. BELL: -How about_just SPRCS logic channel two, 9 will- it shut it?
j 10 MR. O'CONNOR:- Just. channel two, no. If all I did i
! II was these tan) solenoids, nothing would happen.
I2 MR. BELL: These two, C and D.
] [
13 MR. O'CONNOR: I would have a half trip present.
I4 Now for the sake of discussion, let's Ljust say 15 . that the'only thin 9 that picked up was actuation : channel one.
i l 16 It would get the-A and B solenoid- for the No. 1 side MSIV,and II it would get the C,-D and E solenoid for the No. 2.
,' So both
) 18 MSIVs would shut on:a single actuation channel.
IE f -MR. ROSSI:- And actuation channel would do the same 20 . thing?
21 l; LMR. O'CONNOR: Yes. It would'get-the C, D and E 22 solenoids .on that main steam-line'onc and the A and B solenoids 23
.on:the other side. So the only thing it had to pick up to 24 shut both MSIVs is one actuation channel.
- . 43F.dwor m,or+m, W. l 25 MR. BEARDS. There wasca lot of confusion about this.
I 8
h l
29 Sim 9-9 I thing, and it was obvious with five different ones and two 2 getting together. It is very complicated. So we are trying 3 to sort it out, but I was generally trying to get from you 4 not the engineering details, but your own operational 5 experience that this is what it takes.
6 MR. O'CONNOR: That is what it takes. I have a 7 very good, little, simplified training drawing of this if 8 you guys would like it and I will go get it for you. It has 9 got actually the air valves and everything.
10 MR. BEARD: It would be handy, but we can do that 11 after the meeting.
12 I am not certain. Ernie, is it necessary to put 13 a training drawing like that on the record?
14 MR. ROSSI I don't believe so, no.
15 MR. BEARD: It wouldn't hurt. Why don't we just 16 show that it will be on the record.and that way you don't have 17 to worry about it.
18 MR. ROSSI: Fine.
19 MR. BEARD = We can get that after we finish this.
20 discussion.
21 MR. ROSSI:s The only other thing is I had a 22 question that I guess Wayne Lanning wanted the answer to, or 23 maybe it was somebody here. There was a question on how sure 24 are you that you didn' t get water through the PORV during Ace-Federal Reporters, Inc.
25 the event?
. o 40 Sim 9-10 1 MR. O'CONNORr This is just pure conjecture on my 2 part, but based on the pressurizer level that was indicated, 3 it doesn't appear that we were solid in the pressurizer.
4 However, you can't always be positive with the pressure 5 changes and the insurging that was going on that the indicated 6 pressurizer level was necessarily accurate, especially since 7 we had been venting out through the PORV.
8 So I would say there is probably a 50/50 chance that 9 maybe we did have some, you ' mow, either real wet steam or 10 water leave the PORV, but I am sure engineering will have to 11 get into that and tell us for sure.
12 MR. BEARD: I remember a question that came up 13 in some of Wayne's other material that we might get clarified 14 if you want, Ernie, having to do with the runback on the loss 15 of one main feed pump.
16 Bill had talked in an earlier interview about how 17 successful that is likely to be and that kind of thing. Do 18 you know what I am thinking of?
19 What I was trying to get at, Bill, is if you were 20' at say 90 percent power and you lose one main feed pump, what 21 is the likelihood of, and!ho other problems, of: the runback bein ig 22 succesful under the assumption that (a) the other pump is also 23 an automatic and (b) the second pump is in manual?
24 MR. O'CONNOR: In other words, the conditions we-AOFederal Reporters, Inc.
25 were in that night.
- 4 ,
i- -
1 >
41
'Sim 9-11 j MR. BEARD:_ And the alternate, which would be that the second' purnp was in automatic. l 2
MR. O'CONNOR: In other words, both pumps were in 3
- L automatic?
4 MR. BEARD = Yes.
MR. O'CONNOR: If~both pumps were in automatic ---
MR. BEARD = And then you lose one.
7 MR. O'CONNOR: --- and we lose one, we would have 8
i j I feel a better chance of making it than having the one in 9
manual because the ICS immediately sees the loss of feed pump 10
~
]_ jj and runs it right up to the high-speed stop,twhere it:took i
12 several seconus, probably 10 or 15, before theroperator actually i
13 g tuthere and ran the~ pump up.
l ,
So I feel that our odds would have been better had j4 i
b th pumps been in ~ automatic to make the runback. But it is
- 15 still, touch and.go whether high pressure will get you since
{ 16 l 37 you still~have a not underfeed condition for the power IcVel.
1 18 Y u can' t pump 90 percent power with one feed pump. You can 3
39 only pump 60 to 65 percent power.
l 20 MR. BELL: But isn't the limiting thing the inability 21 to turn reactor power very quickly in this situation? You were l at y ur ind x limit, which says the bite on the control rods 22 was very,,very:small. So they get a signal to start moving in 23 [
l 24 and they move in at 30-inches a minuto and almost a negligible u r.d.r.: n.p.m., Inc.
f 25 amount of reactivity is added d'uring the first part of the 4
- 5 m L I
I
? r
_i_ m.__ _ _ _ii ______ _ _ _ _ _ _ _ ___
42 Sim 9-12 y runback?
MR. O'CONNOR: It does not move power very fast 2
initially. Well, w g t down to 80 percent where we tripped.
3 4
So it was moving not too slow, but, you are right, Larry, that the rods are not worth a lot at 92 or 93 percent 5
withdrawal. But I still think that had both pumps been in 6
auto we would have had a better chance than we did with one 7
'" " """I*
8:
9 MR. BEARD: Well, just ball parking it, would you 10 say that if they were both in automatic you would have a ji 50 percent chance or 80 percent chance?
12 MR. O'CONNOR: I would say 50/50 for that and 13 pr bably less than a 30 percent chance with one in manual y from 90 percent power.
15 MR. BELL: Let's take the same situation in group 16 7 at 75 percent.
j7 MR. O'CONNOR: We can't run that way.
18 MR. BELL: Well, I know.
19 (Laughter.)
20 I know that there are other limits.
21 MR. O'CONNOR: You would probably make it every 22 DI"C*
23 MR. BELL: That is what I thoaght.
24 MR. ROSSI: Do you have anything more?
i AoFederal Reporters, Inc.
25 MR. BEARD: No, sir..
(
_- d.
43 Sim 9-13 1 MR. BELL: No.
2 MR. ROSSI: Okay. Why don't we go off the record 3 then and finish this.
4 (Whereupon, at 2:12 p.m., the meeting concluded. )
5 6
cnd Sim 7 Sim fois 8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Ace Federal Reporters, Inc.
25 v
i CERTIFICATE OF OFFICIAL REPORTER j
This is to certify that the attached proceedings before the UNITED STATES NUCLEAR REGULATORY COMMISSION in the t
- matter of
I j NAME OF PROCEEDING: DAVIS DESSE INCIDENT j (Interview & Meeting)
I
[ (CLOSED) f k
DOCKET NO.: --
. PLACE: OAK HARBOR, OH !
l DATE: TUESDAY, JULY 9, 1985 .
l l were held as herein appears, and that this is the original
! transcript thereof for the file of the United States Nuclear f I Regulatory Commission.
i 4
(sigt) J D ,_ f,T/c _
4/. [/2fdh/h (sigt fM [ ,
j i 6 (TYPED) GARRETT J. WALSH, J j (Typed) MYRTLE 1,
H. WALSH Official Reporter ACE Federal Reporters. Official Reporter i Reporter's Affiliation
- ACE Federal Reporters l
1 i
(sigt) % %
l (Typed) MARY 9f'ONSfM
[ Of ficial Reporter ACE Federal Reporter.
L frdf*g (o'aece)
Alarm Setpoint Location Ma.'Stm Line 2 Lo Press Less Panel 12 Row 5 Press. Trip Than 600 psia Column 4 Mn. Sta Line 1 10 x Background Panel 12 Row 6 Rad. Hi Column 3 Hn. Sta Line 2 10 x Background Panel 12 Row 6 Rad. Hi Column 4 l MPT Mn Stm Press High 935 psig Panel 15 Row 1 '
Low 835 psis Column 3 MSR l'Ist Stg 17.5 in Above C/L Panel 15 DT LVL 17.5 in Below C/L Row 2 Column 4 ,
1SR 21st Stg 17.5 in Above C/L Panel 15 DT LVL 17.5 in Below C/L Row 2 Column 5 MSR 12nd Sta 17.5 in Above C/L Panel 15 DT LVL 17.5 in Below C/L Row 3 Column 4 MSR 2 2nd Stg 17.5 in Above C/L Panel 15 DT LVL 17.5 in Below C/L Row 3 Column 5 MSR 1 MOIS SEP 17.5 in Above C/L Panel 15 DT LVL Hi Row 4 Column 4 MSR 2 MOIS SEP 17.5 in Above C/L Panel 15 DT LVL Hi Row 4 Column 5 MSR 1 MOIS SEP 17.5 in Below C/L Panel 15 DT LVL Lo Row 5 Column 4 1SR 2 MOIS SEP 17.5 in Below C/L Panel 15 DT LVL Lo Row 5 Column 5 1SR 1 HI LVL 3 in. Below Panel 15 TURB TRIP Bottom of Vessel Row 6 Column 4 NSR 2 HI LVL 3 in. Below Panel 15 TURB TRIP Bottom of Vessel Row 6 Column 5 C. Control Functions And Interlocks
- 1. MSIV Control Refer to Figure A-9 for MSIV operation. The MSIV's are controlled using three main air operated three-way valves, number 10, 11, and 12. Solenoid actuated air operated three l
way valve #15 is a MSIV test valve. As shown valve #15 is '
de-energized admitting air through valve #11 to the underside of the MSIV piston. Valve number 12 is venting the top of the ;
piston allowing air pressure to overcome the spring pressure i on top of the piston to open the MSIV. Valves 10, 11, and 12 are shown with control air admitted to them, to open the ,
MSIV. Removing control air from valve 10, 11, and 12' causing i valve 10 and 11 to align to the exhaust port to vent the '
underside of the MSIV piston and aligning valve 12 to admit air to the top of the piston will cause the MSIV to close
, with an ,ir assist to the spring pressure, i Valve #15 when energized to test the MSIV positions to vent air from the underside'of the piston through valve #11. The throt'.le valve #16 ' slowly exhausts the air and the MSIV will 18-A
m*.wamad MSIV CONTROL AIR DIACRAM -
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( Shown with solenoids 101A thru E energized and MSIV open 4 s Figure A-9
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l slowly close due to the spring pressure. At 90% open posi-tion a switch is actuated de-energizing the solenoid on valve ,
15 to position 15 to align air to the underside of the piston reopening the MSIV (refer to Figure A-10 for the electrical diagram).
A failure of valve 10,11, or 12 which causes only one of the valves to reposition with the MSIV open will cause the MSIV to slowly close due to spring pressure. If valve 12 reposi-tions air would be admitted to the top of the piston and air pressure would be equal on both sides of the piston with Spring pressure acting to close the valve. If valve 10 or 11 repositions air would be vented from under the piston and both sides of the piston would be vented and the MSIV would "
slowly close due to spring pressure. A break in the control air line to valves 10, 11, and 12 would cause all three valves to reposition to close the MSIV with air assisted spring pressure, the same as the normal closure operation.
Solenoid operated three way valves 14A thru 14E control air to air operated valves 13A thru 13E. Solenoid valves 14A thru 14E are shown energized admitting control air to air operated valves 13A thru 13E, which positions 13A thru 13E to open the MSIV.
13A and 138 are the primary control valves. If 13A reposi-tions to its exhaust port 13B supplies air to 13A to hold the MSIV open. If 13B repositions to the exhaust port it aligns 13A's exhaust port to be vented, however 13A still supplies pressure to the three main MSIV control valves to hold the MSIV open. If 13A and 13B repositions 13A aligns to air out of 13B and 13B aligns to its exhaust port venting air from the main MSIV control valves and they will reposition to close the MSIV.
13C, 13D, sad 13E supply air to 13A and 13B. 13C and 13D work as a pair. If 13C and 13D reposition 13C aligns to receive air from 13D and 13D aligns to receive air from 13E, so that 13E is supplying all air. 13C supplies 13A and 13D supplies 13B, so that both primary valves still have air at there inlets and unless both 13A and 13B are repositioned as above the MSIV remains open. If only 13E repositions the only thing that happens is that 13D exhaust port is vented, and the MSIV will remain open. If 13C, D, and E reposition then valve 13A is vented through valve 13C to 13D to 13E and valve 13B is vented through 13D to 13E which will remove air pressure from the main control valves causing the MSIV to close regardless of the position of 13A or 13B.
As discussed above te close the MSIV both 13A and 13B must reposition or 13C, 13D, and 13E must reposition. Refer to Figure A-10 for control logic of solenoid valves 14A thru 14E which operate air valves 13A thru 13E.
20-A
n e '
MSIV SIMPLIFIED ELECTRICAL LOGIC I
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STAS legte sa C3(elete) 1101A X
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JdE11 SV101A l Shown with solenoids 101A thru E energized sv101: O
__ 8V101C AND TIREW OpBN PERMISSIVE MB 101 SV101D O D Figure A-10
.__ sV101t 21-A
I o i' l Primary control valves 13A and _138 are controlled _ thru 14A l and 148 which are controlled by solenoids SV101A and SV101B, i
respectfully. Solenoid SV101A is controlled by relay KB and solenoid SV1018 is controlled by relay KA. The Control Switch to open and close the MSIV is on the SFAS Panel Level
- 4. The diagrams show relays KA and KB energized with no SFAS or SFRCS trips. The open and close contacts are con-trolled by pushbuttons that return to normal which is the i
position shown in the diagram. Pushing the close switch ,
breaks the CS (close) contacts de-energizing KA and KB which in turn open the KA and KB contacts which de-energize the SV101B and SV101A solenoids which cause the MSIV to close as described earlier.
With the MSIV closed and KA and KB de-e:nergized the KA and KB contacts are open. Pushing the open switch completes the circuit to energize KA and KB contacts in parallel with the CS (open) contacts so that when the switch is released the relays remain energized. A KA contact also closes that ener-gizes solenoid SV101B and a KB contact closes that energizes solenoid SV101A to operate 148 and 14A respectfully to admit !
air to 138 and 13A to open the NSIV as long as 13 C, D, and E are aligned. A level 4 SFAS Channel 1 trip or a SFRCS Channel 1 trip will de-energize the KA relay causing 138 to ;
reposition. A level 4 SFAS channel 3 trip or a SFRCS Channel 3 trip will de-energize the KB relay causing 13A to reposi-tion. Therefore, either a SFAS Channel 1 or a SFRCS Channel 1 trip plus either a SFAS Channel 3 or a SFRCS Channel-3 trip ,
will de-energize both KA and KB causing 138 and 13A respect-fully to reposition causing the closure of the MSIV.
Control valves 13C, D, and E are controlled thru 14 C, D, and E which are controlled by solenoids SV101C, D, and E. Sole-noids SV101C and SV101D are in parallel and an SFRCS Channel 4 trip will de-energize SV101C and SV101D which in tura causes 13C and 13D to reposition. Solenoid SV101E will
- de-energize on a SFRCS Channel 2 trip. Therefore, a SFRCS Channel 4 and Channel 2 trip _will cause SV101C, D, and E to :
de-energize which will cause 13C, D, and E to' reposition and close the MSIV as described earlier. Note that if only solenoids SV101C, D, and E tripped due to an SFRCS Channel 4 and Chsanel 2 trip that 13A and 13B are not affected and '
should the trips be reset then SV101C, D, and E would ener-gize causing 13C, D, and E to realign to the position shown ,
on the diagram and open the NSIV. If this is the case and the MSIV's should remain closed the close switch on SFAS ,
Panel Level 4 must be pressed to de-energize KA'and KB relays which in turn will realign 13A and 138 to the close position, preventing opening of the MSIV upon resetting the SFRCS' trips.
A level 4 SFAS trip will open the SFAS contacts and any one of the following will open the SFRCS contacts:
i 22-A 1
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a
- a. SG pressure >FW prersure by 177 paid.
I b.
c.
Main steam line pressure drops below 612 psig.
S/G level decreases to 25.6 inches on S/G startup range instrumentation.
Operation below 612 psig main steam line pressure is accomp-lished by depressing both " BLOCK" swiches HIS 100B and HIS 100C (for MS 100) and HIS 101B and HIS 101C (for MS 101) between 650 and 612 psig to defeat the SFRCS trip of the MSIV's.
- 2. Other System Interlocks There is a pressure switch on L.P. Turbine 1-1 which actuates I at 10% steam load. Below 10% load this switch causes the RSSV's to auto close, holds open the first stage drains to the condenser, and holds open the moisture separator drains l
to the condenser. Above 10% load this switch allows the I RSSV's to be opened, transfers the first stage drains to level control mode, and transfers the moisture separator drains to level control mode.
There is a pressure switch on L.P. Turbine 1-1 which actuates at 20% steam load. Below 20% load this switch holds open the I second stage drains to the condenser. Above 20% load this switch places the second stage drains on level control mode.
There is a pressure switch on the H.P. Turbine exhaust to the MSR which actuates at 65% steam load. At 65% load increasing this switch opens the RSHLV. At 65% load decreasing this switch closes the RSHVL.
The ICS has interlocks which prevent the turbine bypass valves from passing flow to the condenser when condenser pressure is greater than.10 inches HgA and/or total circulat-I ing water flow is less than 210 KGPM.
Moisture Separator Drain Tank level is interlocked with the i
turbine. When Drain Tank Level reaches 3 inches from the bottom of the MSR vessel the turbine will trip.
I The ICS controls the TBV and the Atmospheric Vent Valves.
The TBV pressure setpoint is set by the operator. The TBV pressure setpoint is normally set at 870 psig. The Atmos-pheric Vent Valves are set at 1025 psig.
I D. Inputs To The RPS/SFAS/SFRCS There are no inputs to the RPS or SFAS from the Main Steam System.
There are 12 pressure switches upstream of each MSIV that provide I control signals to the SFRCS. 4 pressure switches p?r header actuate at 650 psig decreasing to provide a " BLOCK" permissive I
23-A
.~ . - . - - . . . _ - . . _ _ _ - - _ _ - - _ _ . . = _ - . - - _ _ . - - . .
1 0 .
- signal. The other 8 pressure switches per header actuate at 612 -
j psig with 2 pressure switches per SFRCS channel to provide a trip :
' signal. See the SFRCS Study Guide for SFRCS logic.
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I 24-A L.