ML20129B075
| ML20129B075 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 07/10/1985 |
| From: | NRC COMMISSION (OCM) |
| To: | |
| References | |
| NUDOCS 8507290063 | |
| Download: ML20129B075 (41) | |
Text
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P0fL O! UN11ED STATES NUCLEAR REGULATORY COMMISSION IN THE .NIATTER OF: DOCKET NO: 50' DAVIS BESSE lilCIDEitT (IllTERVIEtt 8 flEETilIG)
(CLOSED)
, SFRCS Actuated Equipment and Operations.
LOCATION: UAK HARBOR, OH PAGES: 1 thru 37 DATE: July 10, 1985 gr-o p ACE-FEDERAL REPORTERS, INC.
OfficialReporters 444 North Capitol Street Washington, b.C, 20001 8507290063 850710 (202)347-3700 (DR ADOCK 0500 6 NATIONWICE COVERACE a
e .
1 Sim -1 i UNITED STATES OF AMERICA 2 NUCLEAR REGULATORY COMMISSION 3
4 i
5 WEDNESDAY, JULY 10, 1985
-~-
6 7
8 MEETING BETWEEN Tile NRC FACT-FINDING TEAM AND TOLEDO EDISON 9 ON 10 SFRCS ACTUATED EQUIPMENT AND OPERATIONS 11 12 13 NRC FACT-FINDING MEMBERS PRESENT:
14 15 ERNEST ROSSI 16 J. T. DEARD 17 LARRY BELL 18 19 TOLEDO EDISON MEMBERS PRESENT:
20 V. MacDONALD 21 LARRY STALTER 22 SUSMIL JAIN
, 23 KENT YARGER 24 A.V.deral n.portm. inc.
25
e o l 2 l l
Sim 1-1 j PROCEEDINGS 2 (9:10 a.m.)
3 MR. BEARD: This is another meeting of the fact-4 finding team with Toledo Edison for the purpose of having 5 some technical discussions on the equipment that is actuated 6 by the steam feed rupture control system.
7 The real purpose that we are trying to accomplish 8 here is to make sure that our understanding of how the system 9 and associated equipment work is technically accurate.
10 Last night, or sometime yesterday we were given 11 copics of some drawings that related to the control schemes 121 for -- and correct me if I am wrong on this -- the main steam 13 isolation valve, and I believe we had control drawings for the 14 valve MS-107, which is the steam admission valve for the 15 No. 2 aux feedwater turbine from the No. 2 steam generator, and 16 I believe we had some motor operated valves that included for 17 Valve AF-608, which is the isolation valve between the No. I 18 steam generator and the No. I and No. 2 aux feedwaters. It 19 would isolate both.
20 MR. JAIN: Right.
21 MR. BEARD: In other words, it isolates the No. 1 22 steam generator from all aux feedwater.
, 23 MR. JAIN: Correct. I believe you also had a 24 drawing for MS-106, which is a DC motor operated valve for AceToderal Reporters, Inc.
25 the steam inlet to aux feed pump turbine one and generator 1
. o l Sim'1-2 j No. 1.
2 MR. BEARD: I think we did, but I had some problem 1
in understanding which drawings went with which valves. But 3
4 we have got 106?
5 MR. JAIN: Yes.
P.R . BEARD: Let me ask you, can you just tell me 6
7 which drawing number, that is E-46-B, sheet, whatever it is, i
8 is the appropriate one for 106?
MR. JAIN: Well now, E-46-B, Sheet 54A is for MS-106. j 9
10 MR. BEARD: MS-106.
l p MR. JAIN: And E-46-B, Sheets 46-A and 46-B ---
1 12 MR. BEARD: Are for what?
13 MR. JAIN: Arc for MS-107 and 107-A.
ja MR. BEARD: 46-A and B are 1077 15 MR. JAIN: It really is for 106-A and 107-A.
16 MR. STALTER: 106-A and 107-A.
- j7 MR. BEARD
- Wait a minute. I am confused again.
18 46-A is ---
j9 MS. MacDONALD: 106-A.
20 MR. BEARD: 46-A is MS-106-A ---
l 21 MR. JAIN: And 107-A.
22 MR. BEARD: --- and MS-107-A. Okay. That is why
, 23 I,was confused because I thought 107 was on a different
! 24 drawing.
AO7ederol Reporters, Inc.
! 25 So the total of all of the valves that we have got t
L_
. . 4 S'i 1-3 1 here would be the MSIVs, 608, 107, 106-A and 107-A?
2 MR. JAIN: And also E-46-B, Sheet 4-A and 4-B is 3 for 107, 4 MR. BEARD: That is right. 107 is Sheet 4-A and 5 B.
6 MR. JAIN: Right.
7 MR. BEARD: Now Sheet 4-C and D, that is AF-608. Is 8 it also for 5997 9 MR. JAIN: Yas. That is E-44-B.
10 MR. BEARD: E-44-B, Shee t 4-C.
11 MR. JAIN: Right.
12 MR. BEARD 5 And that is for both 608 and 5997 13 MR. JAIN: Correct.
14 MR. BEARD) All right. At 1 cast we know all the 15 valves that we have got the drawings for.
16 MR. JAIN: The way we normally do it here, JT, is 17 normally speaking, one drawing would show valves in what 18 loops. The one in parentheses would correspond to the second 19 loop.
20 MR. BEARD: What threw me for a loop was the 107 21 drawing. All right.- At least we have a good understanding 22 of it.
, 23 What I have done, and I want to give you a copy 24 right now, and I want to put it on the record also, so if Ace-Tederal Reporters, Inc.
25 I can ask that this be exhibit, whatever it is.
. . 5 Sim 1-4 (The documents referred to (three pages of diagrams) was marked Exhibit No. 1 and submitted for the record.)
XXXXXXXXXXX MR. BEARD: I took the drawings for MS-107 and tried 5
to simplify them to show only the active components, and by that I mean I tried to make it from a wiring diagram into 7
a schematic and eliminating where the wire went from one terminal to the next terminal to the next terminal and to the 9
next terminal. I just did not Cover that in this sketch, g this cartoon.
g What I would like to do is give you a copy of that and use that as the basis for the discussion because if the g simple schematics are correct, then I understand how this valve works.
Do you see what I.am trying to do?
16 MR. JAIN: Yes.
MR. BEARD: If that is okay with you, that is what 18 I would like to do.
39 20 Now what I have done is I have done that for the 107 valv aad I have done it for the 608 valve, but let's hold 21 22 that one for a moment..
M. AIN: Okay.
. 23 24 MR. BEARD: There is a copy we can talk from and Ace-Tederal Reporters, Inc.
I have a copy.
25
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e e
6 Sim 1-5 j Now on the 107 valve I understand that that 2 corresponds to drawings E-46-B, Sheet 4-A and 4-B; is that 3 correct?
4 MR. JAIN: Cerrect. The first one you have on top 5
here, the first one is marked 4-B.
6 MR. BEARD: That is right. The way I happened to 7 put it is page 4-B had the details that in my mind seemed to 8 cone up front rather than at the end, but six of one and half 9 a dozen of the other.
10 Now 4-B, if we start with that one, as I understand 11 it, 4-B has basically three parts. Now let me see if I can 12 tell you my part, and I am referring to my sketch here. So 13 if I am wrong, you can tell me, but the first part on the ja sketch is basically the left half of the diagram.
15 As I understand it, there is a contact to limit 16 switch, an AOS contact, which means that as soon as the valve 17 is fully opened,.I will then energize a 25 second time delay 18 relay, which is 33X.
19 MR. JAIN: Right.
20 MR. BEARD: Now once that is energized, it will then 21 apply power to four pressure,' switches, PS-107, A, B, C and D.
22 MR.'JAIN: Correct.
. 23 MR. BEARD: And thenLthose pressure switches would 24 close if I have low steam pressure, and I assume this is on Ace-Tederal Reporters, Inc. ,
25 the inlet side of-the turbine.
1 7
Sim 1-6 j MR. JAIN: Correct.
2 MR. BEARDS Okay. If the A and C contacts flows, 3
that would cause relays R-1 and R-2 to pull in. If the B and
-j D. switches close, that would cause R-3 and R-4 to pull in, c
5 and then there is a seal-in circuit that is connected up 6
through a reset switch for the relays R-1, 2, 3 and 4.
7 MR. JAIN: Right.
8 MR. STALTER: Yes, that is right.
9 MR. BEARD: So all of that has to do with low steam 10 : Pressure on the inlet to the turbine?
jj MR. JAIN: Correct.
I 12 MR. STALTER: .Right.
13 MR. BEARDr Now that is I guess functionally the
.jg first half of the~ drawing.
15 The second half is a very simple one which has a
~ 16 Pressure switch low limit switch labeled PSL-4931-A, which I j7 . understand opens if-we have-low suction' pressure on.the 18 . Pump, the aux feed pump.
19 MR.,STALTER:';That.isLlow suction pressure.
20 MR. BEARQ , Low suct' ion pressure, and when that 21 Opens that causes a-two-and-a-half.second time delay relay
. 22 s to= drop out, and apparently it is delay on. opening. In.other
- j. '
lwords; ' ;thet time ; delay would be such that. the relay would
. 23 , ,
24 change states two-and-a-half seconds afterfthe low'suct. ton
, ; Ace-Toderal Reporters, Inc. '-
- '. ..j 25 Pressurofsignal'was detected. That'is my understanding.
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---:a.._L -. a'-.. _ -..m-_.a- __ - - -
8 S hn l 1 MR. JAIN: That is correct.
2 MR. STALTER: Correct.
3 MR. BEARD: Okay. If that is correct, then I guess 4 I really only had one question. This low suction pressure 5 . switch, which pressure switch is that on the PNID type space?
6 MR. JAIN: That will be on MOO-6B on the suction 7 of the aux feed pump.
8 MR. YARGER: They are reflected in the upper right.
9 MR. BEARD: But aren't there a number of low suction 10 switches in each suction line?
Il MR. JAIN: There are two sets of low pressure switche s.
12 One will be upstream of the isolation valve from the CST, 13 the condensate storage tank, and another set is downstream 14 of the isolation valve from the CST.
15 Now these here are the ones downstream of the 16 isolation valve CST.
17 MR. BEARD: All right. Let me see if I get this 18 .right. I have got a valve that draws suction from the 19 condensate storage tank.
20 MR. JAIN: : Correct.
21 MR. BEARD: And I have got a motor operated valve 22 and it comes in, right?_
, 23 MR. JAIN: Right.
24 MR.' BEARD: And then ~ there is another motor operated Ace-Tederal Reporters, Inc.
25 valve from a different source.
, . ~. , . .-.
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9 cSim[1-8 1 MR. JAIN: From service water.
2 1HR. BEARD: All right, and it has a parallel path.
'3 Now how do these two lines join together? Aren't there
~
4 strainers and DPs and things like that?
i 5 MR.--JAIN: Yes. There is a strainer in the line.
a
) 6 MR. BEARD: Is the strainer common?
7 MR. JAIN: After the service water.
8 MR. BEARD: Right here?
i' .
9 .MR. JAIN: Well,'after the: lines join'together.---
10 MR. BEARDJ After they join together.'
l
~
11 MR. JAIN: --- there is'a' strainer before it goes-12 .to the' aux feed pump.
13 MR. BEARD: Now this is the aux feed pump suction?
14 MR. JAINi Correct.
p 15 MR.1 BEARD: Now where are these DP switches we are 16 -talking about, or. pressure-switches?
-17 MR. JAIN: .There is a set of low: pressure switches 18 right here which essentially sends a breakfin-the line from 19 the CST or.a. low level.
. 20 : MR.iBEARDif' That?is upstream'of the-isolation valve?
21 . MR. JAIN: .
Correct. Once that senses low pressure, r
l 22 you,6ransfer suc61onito se.rvice wat'er; you close this valve
.m ,
n . 23 and open.- that valve and you get" water.
1-L L 24 MR.IBEARDiRight.
L Md.d.,al it.portm, Inc.
! 25 MR. JAIN: The ones that sense the' suction pressure
- ) .
10 Si l' 9 1 at the pump, I believe they are downstream of the strainer.
2 MR. STALTER: They are downstream of the strainer.
3 MR. YARGER: Correct.
4 MR. BEARD: So here is where some pressure switches 5 are.
6 MR. STALTER: Right.
7 MR. JAIN: Those are the ones that are being torqued 8 here.
9 MR. BEARD: So this would correspond to this, 10 PSL-4931-A. Now I assume that there is probably more than that 11 one in that location, but that is where that one is.
12 MR. JAIN: Right.
13 MR. BEARD: If I lose pressure from the condensate 14 storage tank, or at least sense that I do, then I am going 15 to start these valves cycling, correct?
16 MR. JAIN: Correct.
17 MR. BEAWW Now to what extent will that low pressure 18 be sensed by the one that is right at the suction downstream 19 of the strainer?
20 MR. JAIN: Okay. The'ones from the CST are at
~
21' 2 psi.
22 MR. BEARD: 2 psi.
. 23 MR. JAIN: And the ones here near the pump are set 24 at 1 psi.
, Ac}7ederal Reporters, Inc.
l 25 MR. . BEARD: Okay. So the one right at the suction,
F 11 Sim'l-10 .)
which is on this cartoon, is-really the more sensitive, if 2
you will, in terms of setting. It will go at a lower pressure.
3 MR. STALTER: At a lower pressure.
4 MR. BEARD: Well, I guess you would have to lose 5
suction worse is really what that amounts to, doesn't it?
16 MR. JAIN: Right.
7 MR. STALTER: Yes.
8 MR. BEARD: You would have to have a worse loss of 9 suction.
10 MR. JAIN: Yes, and what it essentially does, this 11 pressure switch right at the suction, it essentially trips 12 the turbine by closing the steam inlet valve to it.
13 MR. BEARD: I understand that. Now what I am trying 14 to understand though is can I get, you know, part of the event 15 was an inadvertent switchover.
16 MR. JAIN: Correct.
17 MR. BEARD; If I sense low pressure on the condon-18 sate storage line that has gotten down to 2 psi, and it can 19 be even spurious, but assume for a moment the pressure really 20 did go low, what is the likelihood or probability that I will 21 also see it on this one psi switch right at the suction, the 22 . common point and therefore cause the turbine to get tripped?
. 23 MR. JAIN: It really depends ;cn1 so many things that 24 may have been happening at the time if it is a genuine large Ace 7ederal Reporters, Inc.
25 suction pressure dip, it may be sensed by this turbine switch
12 Sim 1-11 j here. However there is a time delay.
2 MR. BEARDI That is what I was trying to get to.
3 Does two-and-a-half seconds cover that? That I guess is 4 based on the experience, isn't it?
5 MR. JAIN: Yes. There is nothing analytical there.
6 It is basically some number.
7 MR. BEARD: I think the three dollar word is it is 8
mpirically determined.
9 MR. JAIN: Right.
10 MR. BEARD: All right. That takes care of I think ij the special features on the first page here that I tried to 12 talk to, and you are saying this agreen with your understanding:
13 MR. JAIN: Correct. Could you leave the option open 14 to look at it and if we find anything to call you?
15 MR. BEARD: Oh, absolutely. I only did these so that 16 I could try to convince myself did I understand it or not, and j7 the main purpose is to find out whether my understanding is 18 right or wrong. So,take what time you need.
19 MR. JAIN: Okay.-
end Sim 20 Sue fois 21 22
. 23
( _
24 l AceTederal Reporters, Inc.
L 25 ,
t
13
- 2-1-SueWalshi MR. DEARD: Okay. Now, the second page related 2 to MS-107 is more, as you noted earlier, related to Sheet 3 4-A, I guess it is. And what I did in the cartoon was again 4 to convert from a wiring diagram to a simplified schematic.
5 And I only included the automatic opening loop 6 and the automatic closing loop. I did not include any of 7 the indicator circuits, and I did not include any of the 8 manual operation circuits, because I wasn't that interested 9 in those. All right.
10 Now, as you are looking over, would it be helpful 11 for me to go through this? Or, how would you prefer to do 12 it?
13 MR. JAIN: I guess the manual --
14 MR. BEARD: I'm not interested in manual right 15 now.
16 MR. STALTER: Oh, okay.
17 MR. BEARD: Just the auto open and auto close.
18 Now, recognize that it was late last night when I did this.
19 And I make mistakes as much as anybody. So, if there is 20 an error that's what we want to find.
21 (Pause.)
22 Okay. Now, with your having taken a moment to 23 look at the cartoon and the drawings, what did you find 24 out?
j heiederal Reporters, Inc.
25 MR. JAIN: You just had a small typo here on the I
l 14 1
- 2-2-SueWalsh1 . torque switch on the right side. It should be 33/TC versus 2 TO.
3 MR. BEARD: This is in the auto close circuit? ,
4 MR. JAIN: Correct.
6 MR. JAIN: Right. ;
8 MR., BEARD:. Thank you. ,
9 MR. JAIN: And then --
10 MR. BEARD: I had the words right. I just left
^
11 the letter off, didn't I? Yeah.
12 MR. STALTER: You lef t out the sealing circuit 13i. on the 42 over C. Do you want to --
14 MR. BEARD: Is this -- are we talking on the '
15 closing side?
16 MR. STALTER: Yeah, the closing side.
17 MR. BEARD: There is a seal in there?
18 MR. STALTER: Yes.
19 '
MR. JAIN: Right. 42AC.
20 MR. BEARD: All right. My understanding was that 21 did not affect automatic at all? -
22 MR. STALTER: Well, it seals in. When it' closes !
23 up it seals in. ;
24 MR. DEARD: Well, let me ask you. Do you see the Actr.d.coi n.p.,,.,i, rac.
25 line that I was tracing down through? I l
15
_#2-3-SueWalshi MR. STALTER: Yeah. It goes through the stop --
2 MR. BEARD: Wait a minute. See, what I was tracing 3 dbwn was through this way. Yeah. Okay. And it looked like 4
that this scaled in around here but didn't around here.
5 MR. STALTER: It seals in. As soon as this picks 6 up it seals it in through here.
7 MR. BEARD: Oh, I see. So, that what we need to 8 s how on here 'is I guess a seal in from this point --
9 MR. STALTER: From right here to here.
1 10 MR. BEARD: Right. And the only thing that is in 11 there that is of any significance is the stop and the open 12 switch, right? So, if I come across here there is your stop 13 and then there is an open contact, the control switch I guess 14 they call it.
1 15 MR. STALTER: Right.
16 MR. BEARD: All right. Now, does that make it 17 accurate?
18 MR. STALTER: Yeah. 42A over C.
19 MR. BEARD: Wait a minute. I copied that the wrong --
20 MR. STALTER: You've got it on the wrong one.
21 MR. BFARD: This is on the closed side, not the 22 open side.
23 MR. STALTER: You've got it over here on the open 24 side.
Ac$ Federal Reporters, Inc.
25 MR. DEARD: This one I missed, because it went up
16
- 2-4-SueWalsh the wrong place. If it had tied back here, I would have picked 2 it up.
3 MR. STALTER: Yeah.
4 MR. BEARD: But this is not the open switch; it's 5 the closed.
6 MR. STALTER: Right here.
{
l 7 MR. BEARD: Right there, right?
8 MR. STALTER: No, you've got it --
9 MR. BEARD: Wait a .ninute.
10 MR. STALTER: This one here you want.
11 MR. BEARD: You are right. I'm sorry. 42A over C.
12 MR. STALTER: Right.
13 MR. BEARD: And the closed switch is really the 14 parallel --
15 MR. STALTER: It's in parallel. Do you want to leave 16 that out?
17 MR. BEARD: Yeah. So, the only thing that would stop 18 it is the stop switch itself?
19 MR. STALTER: Right.
20 MR. BEARD: Okay. Very good. So we are all in 21 agreement with this typo,'if you could call it that, and the 22 seal in circuit which I have now added, that we are right?
23 MR. JAIN: Okay.
24 MR. BEARD: Okay. Now, let me then discuss it. If AcdFederal Reporters, Inc.
25 t neglect the limit switches at the top and the torque switches l
l l
17
- 2-5-SueWalsh and their by-pass contacts, it seems like that to open the 2
. valve what I have to do is not have any low suction at the 3
pressure, or low pressure at the auction.
I have to have 4 appropriate steam pressure coming into the valve -- well, initially I don't.
5 6
MR. JAIN: Twenty-five seconds.
7 MR. BEARD: Right. Because the time doesn't start g until after I got it open.
9 MR. JAIN: Correct.
10 MR. BEARD: So that really doesn't have a play
- on the initial opening in the valve. Okay.
12 And, then I get' basically two safety-related 13 inputs and those are both' from actuation of channel 2 of 34 the SPRCS.
15 MR. JAIN: That's correct.
16 MR. BEARD: K-302 and K-304. My understanding j7 is that those contacts would be activated in the case of
-18 low level n steam generator Number 1 or Number 2, or if 39 I have low pressure in steam generator Number 1 but not low 20 pressure in steam generator Number 2.
21 MR. JAIN: Correct.
22 MR. BEARD: And the two train -- logic channels, 23 if you will, Number 2 which is K-302 and Number 4 which in 24 K-304, are configured in an' And circuit so that both of Aed.dwol s porows. Inc.
25 those have to be tripped'in order.to get this valve to 1
w__.--.--_.----__~'
l 18
)2-6-Suekvalsh1 open.
2 MR. JAIN: Correct.
3 MR. BEARD: And that's where this And is in the 4 carlier --
5 MR. JAIN: Correct.
6 MR. BEARD: -- cartoons that we have talked about, 7 and this is the field wiring.
8 MR. JAIN: Correct.
9 MR. BEARD: Okay. So, that is the And configura-10 tion. And then you get a seal in on that once you pull it 11 all together. Okay.
12 Now, on the closing side, here again you have an i
13! And configuration for the safety-related inputs. They are 14 both from actuation of Channel Number 2, logics 2 and 4 15 again. And as I understand it, the only thing that would 16 cause those two to close would be low pressure in steam 17 generator Number 2, because they come from K-202 and L-204.
18 MR. JAIN: That's correct.
19 MR. BEARD: Okay. I think I understand the 20 circuit.
21 Now, let's go from here and say during the event, 22 MS-107, now that we understand how thin valvo control scheme 23 works; all right, during the event -- let me refer back to 24 the sequence of events so I don't screw this up.
' AceI ederal F Reporters. IM.
25 I don't think I brought my copy with me. Do we h
[
19
- 2-7-SueWalshi have a copy of the sequence of events handy?
2 MS. MAC DONALD: Iloro they are.
3 MR. BEARD: All right. Good. All I want to do is 4 refer to it for a minuto.
5 Okay. Referring to the sequence of events -- and 6 the one I'm referring to is the one the Team put out, Revision 7 2 -- the first thing that happened that I understand would 8 have involved this would have boon the start signals for the 9 aux feodwater, bo it for lovel or pressure, because both of 10 them would have wanted to start one or the other of the 11 pumps, aux food pumps.
12 Now, the first thing that happens is I got at 13 014104 an SPRCS actuation of' Channel 1, which would-be 14 associated with aux food train Number 1. And this is not 15 in that train. So, nothing would have happened for 107 at 16 that point,' correct?
17 MR. JAIN: Is that'the one low levol?
18 MR. BEARD:- That was tho i low level, right.
19 MR. JAIN: Okay.
20 MR.DEARD: That was the low levol on Channel 1.
21 And the sequence of ovents also says this actuation causes 22 aux food pump Number 1 to 1x) aligned to food steam generator
23 Number l'.
24 MR. JAIN: Correct.
Ac. r.d r.1 a. porters, Inc.
25 MR. BEARD: So that would not be related to this 4
I i
__.____-_-._m ._. m__ - _ _ _ _ _ _ _ _ _ _ _ - . _ _ - _ _ _ . . _ _ . _ - _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ _ _ _ _ _ _ _ _ . . _ _ _ . _ _ _ . . . _ . _ _ _ - _ _ . . _ _ _ _ . . . . . . _ ___. _.m_.m . . .
i 20 !
J2-8-SuoWalsh I valve? ?
2 MR. JAIN: Not to MS-107. !
3 MR. BEARD: Right. Now, the second actuation was 4 the manual actuation on low pressure. So, now on manual 5 actuation on low pressure, referring back to what this valvo .
6 would have done, it looks like that it would have gotton --
7 here is where I get questions.
8 MR. JAIN: Yeah. j 9 MR. BE*RD: Whether I would have gotton both of i
10 thoso auto close signals or one of them. I don't know.
11 MR. JAIN: The 202s? !
12 MR. BEARD: 202 and 204. If you pushed the top '
13 right button in the column of the two fives.
14 MR. JAIN: Okay. Pushing the top right button in l
15 that column tells the SFRCS that it has got a Number 2 16 generator that is bad on actuation Channel 2.
17 MR.. BEARD: That would, thorofore, be logic 18 Channels 2 and 47 i 19 MR. JAIN: Correct. ,
20 MR. BEARD: So manual goes to both? I 21 MR. JAIN: Co rrect . And that would have told this ,
22 valvo to go closed.
23 MR. DEARD: Okay. So, the first thing is that -- I
,i 24 Ace 4ederd) Reporters, lat.
I will call it the inadvertent actuation causos MS-107 to 25 closo. >
b I ..
21
- 2-9-SueWalsh1 MR. JAIN: Correct.
2 MR. BEARD: Okay.
3 MR. JAIN: At the same time -- you may not want to 4 ciscuss it right now - but MS-106 would have got a closed 5 s ignal, too.
6 MR. BEARD: Yeah. Okay. Now, the timo on that was 7 014108. Okay.
8 Now, the next thing that would have happened, 9 as I understand it, -would have boon some five seconds lator .
10, at 014113 -- now, this is when we got that second low lovel 11 . actuation --
12 MR JAIN: Uh-huh.
i 13 MR. BEARD: -- and this was Channel'2, actuation I4 Channel 2. I 1
15 MR. JAIN: Uh-huh. ,
16 MR. BEARD: So, now at this ono I got, let's soo, 17 Channel 2 low level. Now, on low.lovel, does that than toll 18 K-302 and K-304 that'they are to trip and, thorofore, I would l 19 now try to open the valve? l 20 MR. JAIN: No. It wouldn't havo happened becauso -- r 2I MR. BEARD: Now,.noglecting the interlock about .
22 full stroke.
- 23 MR. JAIN
- Yeah.
I 24 MR. DEARD: Okay. ,
Ace Federel Reporters, lac.
25 MR. JAlff . Yeah. I'm assuming here that he had not
7 t
22 e
- 2-10-SueWalsh yet reset the spurious manual actuation.
2 MR. BEARD: He had not reset yet.
3 MR. JAIN: So, the low pressure on Number 2 4 generator, on actuation Channel 2 was still in place. That 5 would have overridden in the SPRCS logic. It would have pre-6 vented the 302 signal to come on.
7 MR. BEARD: I hear what you are saying, and I 8 think you are right. I hope you are right.
9 But what I'm trying to find is the drawing that 10 shows where that takes place.
11 MR. JAIN: That would be kind of shown on E-18.
12 That's the logic drawing.
MR. BEARD: E-18. That's the one you've got 13l 14 here?
15 MR. JAIN: Yeah. And if you want to go in detail 16 that would be Instrument and Control analog for the logic 17 drawings which shows all the inputs and And gates and overy-18 thing.
19 Those are CCC drawings.
- nd #2 20 s o;Wal flws 21 22 23 i l
24 Acehderal Reporters, Inc.
25 l n
3-li Joe Wal 23
. 1 MR. BEARD: All right. I nood sono CCC
, 2 drawings.
c 3 But -- lot no ask it this way. What you aro
- 4 saying is the contacts on the open circuit that are on this j 5 cartoon that I developed last night would not be tripped 4
- 6 because of some intermediate relays and logics that, in J
7 o f fect , implomont the prioritization of low pressuro l
]
8 actuation over low lovel actuation?
] 9 MR. JAIN:
l' That is correct. The philosophy 10 of the SFRCS is that the prioritization of -low pressuro
! 11 overriding is conducted all' within the SPRCS logic.
4 12 l MR. DEARD: All within the SPRCS logic. So, j 13 it would all be on E-18 then?
i
- 14 MR. JAIN: E-18 is oversimpliflod logic i
15 diagram.
- 16 MR. DEARD
- E-18-is a simple version.
17 MR. JAIN: Wo have another not of CCC drawings t
18 which show And Gates, and And Gatos and amplifiers, and 19 all those things.
1 20 MR. BEARD:
i All right. Low pressure priority --
21 so, no action for 107, that is what you are saying?
1 22 MR. JAIN: Correct.
j 23 MR. DEARD: And this short story vorsion is 4
24 K-302-C and 304-C do not trip?-
A,.'p.d.r.: wi, lac.
25 MR. JAIN: Correct.
l
3-2-Whl, Joe 24 e
1 MR. DEARD: Okay. Do you remember offhand 2 whether we over got a copy of those CCC drawings, consolidated 3 control drawings that you are talking about?
4 MR. JAIN: Whether the NRC got it?
5 MR. DEARD: Yeah.
6 MR. JAIN: I don't believe so.
7 MR. DEARD: I know wo got some consolidated 8 drawings, but I don' t know if wo got the one that you are 9 referring to.
10 MR. GTALTER: Recently? Since this event?
11 MR. DEARD: Since the ovent, yes.
12 MR. JAIN: We did send you some CCC drawings.
13 HR. YARGER: The only drawing that I provided 14 was the stoam generator low instrumentation.
15 MR. DEARD : Yes, that is right. I remembe r 16 scoing that one.
17 110w much trouble would it bo to got a copy of 18 that? Deforo I say do it, I am trying to say what would be 19 the impact of asking you?
20 MR. YARGER: No problom.
21 MR. DEARD: Why don' t we do it tl is way, then.
22 If it is okay with you throo -- you four, if wo can just tako 23 your word for it that that is the way it is, and then go on 24 Ace'Fede,ol Reporters, lat.
with the understanding you would tot us a drawing, nay, 25 some timo today? In that reasonablo?
53 3-Wcl, Joo 25 1
MR. JAIN: If you wish, I could also show 2 it to you on U-18.
3 MR. DEARD: It in on E-187 Yon, if it in on 4
E-18, I would like to understand it thoro, but I would still 5 like to got the other drawing.
6 Why don't we como back and do that?
7 MR. JAIN: Okay.
8 MR. DEARD: Okay. tiow , that taken un through 9
the first throo actuations. In other words, thoro was a 10 low lovel on Channol 1. Thoro was the raanual pronsure, 11 and than thoro was a low level on Channel 2.
12
. MR. JAtti: Correct.
13 MR. DEARD: Okaj. flow , I think the next thing e
14 that happenn in wo got an overnpood trip on the two aux 15
. food pumps, or pump turbinon, and I don' t neo anything in 16 the control circuits that would cauno thin to be changed, 17 do you?
18 MR. JAIti: 13 0 19 MR. DEARD: Okay. So, the next thing that 20 in really rolovant would bo the renot of that low pronuuro 21 tank. flow, that would bo 0142, and thin in the low pronauro 22 in renot.
- 23 flow, I annumo if that taken placo, now the 24 ud.d.,.I a. poet.<i, =. priority that wo woro junt discunning la cancolled, and now 25 we would got what I thought we might got earlier. .
3-4-Jho Wal 26 1 MR. JAIN: Yes.
2 MR. DEARD: Okay. So, K 302C and K 304C tripped, 3 okay? Now, we have boon 52 acconds into this game, so the 4 ;
valvo has strokod, has it not, or do you know roughly what 5 the stroke time is on this valve?
6 MR. JAIN: It is about 30 seconda.
7 MR. DEARD: 30 second stroko? It seems liko :
8 I renomber a 25 number, but I got those valves all mixed up, ,
9 but the point in it has had enough time to completo ita 10 stroke.
Il MR. JAIN: Right.
12
, MR. DEARD: Okay. So, now at this point the 13 valvo in closed, and we now got the signal to opon it over 14 hero, and I guess basically it opens, and that in it, right?
15 MR. JAIN: Right.
16 MR. DEARD: So 107 openn -- or reopens. Now, ,
17 in there anything olno that should have haprened to that 18 valve?
19 MR. JAIN: We didn't have any indication of 20 nuction pronsure or low steam pronnure.
21 MR. DCARD: To my knowledge, thoro wan no 22 information on low prosauro to tho aux food turbinen. Thoro 23 was some indication lator that there wan low pronouro on the 24 pump suctionn.
- u. r.s...u por, sm.
25 MR. JAIN: I think it wan No. 1.
3-5-Joe Wal 1 MR. BEARD: Yeah, I believo you are right. That 2 was all related to !!o. 1.
3 okay. So, MS 107 would not be affected?
4 MR. JAIN: Right.
5 REPORTER: Mr. Jain, could you koop your voico 6 up, pleaso?
7 MR. JAIN: Okay, I will do that.
8 MR. BEARD: Could we put the microphone clonor?
9 Would that help.
10 REPORTER: That is fino, sir.
i It la just that 11 ho loworod his voico, that is all.
12 MR. DEARD: Okay. I think that takes care of 13 that one , don' t you?
s 14 ' MR. JAIrl: Yeah, I think so.
15 1
MR. DEARD: Let me ask you, in that a pretty 16 completo rundown of how this valve works, and how it wan involved 17 in the ovent?
18 MR. JAIti: The only thing that wo may havo -- I am 19 not saying wo missed it, but thoro in another feature to MS 20 106 and 107, in that they are interlocked with dedicated t
21 drop lino valvon. D11-11 and 12.
22 The purpose of that interlock is that onco you aro 23 going to nhutdown condition, and you want to trip all your 24 he Pederal Reporters, 9%
RCPn, you don't want to utart the aux food pumpn becauno lonn 25 of four RCPn trips SPRCS, and interlock in there which
'3-6-Joe Wal 28 1 provents the opening of its 106 and 107 once the D11-11 or 12 2 are opened.
3 MR. BEARD: All right. And the valvos that 4 we are talking about aro DII-11 and 127 5 MR. JAI!!: Right.
6 MR. BCARD: So what you xo saying is that if 7 they are open, that blocks the actuation related to four 8 RCPs tripping?
9 MR. JAIN: That blocks the opening of steam 10 undercuts.
11 f4R. DEARD: Por this one? Por this valvo?
12 MR. JAIN: (Nods head af fi rmatively. )
13 MR. DUARD: Okay. That apparently was not 4
14 involved in the event at all. I didn't soo where that 15 happens in terms of the actual valvo control scheme.
16', That must be in the logic, or on the 17 consolidated drawinon that you referred to earlier.
18 f tR. JAIN: Tho 33 AC contact in norica would 19 bo 302, 304 --
20 f1R. DEARD: Wait a minuto. Are wo in the 21 opening --
22 MR. JAlti: On the open circuit, on pago 2 of 23 thin drawing.
24 l !!R . 11EARD : Right.
- A,.berel reporters, N.
25 MR. JAIll: Tho 33 AC -- you noe tho two dotn i
'3-7-Joe Wsl 29 I around 33 AC contact on tho bigger drawing.
2 MR. DEARD: You are on what page, 4-A?
3 MR. JAIN: Shoot 4-A, in the open circuitry.
4 MR. BEARD: Yes.
5 MR. JAI?lt The 33 AC contact in nerlos with the 6 SFRCS contacts?
7 MR. BEARD: Yus.
8 ME. JAIN: It says MX, MX?
) 9 MR. DEARD: Yes.
i 10 MR. JAIrl: Okay. Shoot 4-a, if you look at 11 the legend, MX is related to Dil-11 valvo, at the very top.
12 On tho tablo hora.
13 MR. DEARD: Oh, in the table. Dil-11, right.
6 14 I got it now.
15 All right. So that says that really my noto 16 over hero for this 33 AC contact in that this is cloned when 17 D!! 11 is closed.
18 MR. JAI!!: Correct.
19 MR. BCARD: Okay. I didn't pick up that 20 subtlety. I thought it wan on the valvo wo woro working on.
21 I am glad you pointed that out.
22 Okay, very good. Okay. In that protty much 23 it?
24 MR. JAI!!: Thin in the only thing I can think A. rea.r.l s. porters, lac.
25 of right now.
3-8-Joe W21 30
] !!R. BCARD: Okay. I think thin in a good 2 logical stopping point, since we are here. Could we take 3 like a two oc five minuto break and come back?
4 ? !R . JAIN: Okay. Or we could go on.
5 MR BCARD: I would like to take a very brief 6 break, and then leave at ten after, if that in all right with 7 you?
8 MR. CAIN: That in fino.
9 (Briof recess taken.)
10 f1R. BCARD: Okay. What I would like to do, 11 if it in okay with you gentlemen, in jump and talk about the 12 control circuits for Valvo AP-600, which in the isolation 13 valvo betwoon Steam Generator No. 1 and the aux food water 14 trains.
15 Now, my undorntanding in that in on drawing 16 44-B, E-44-B, Shoot 4-C.
17 MR. JAIN: 4C and D.
18 MR. BCARD: 4C and D. I got more out of C than 19 I did out D, though. Just no we can dinponna with it 20 canlly, 4-D neemn to bo the opon/ clone indicator circuito, 21 and nomo of the other wiring layoutn, and not really of 22 functional importanco to ma right now, in that right?
23 Let'n dinponno with that drawing then.
Cnd 3, 24 A,.b.de.g.,,.,i,:=.
Mary G foln25
31 Sim 4-1 1 MR. DEARD: Now again, this is the third page of the 2 exhibit. What I did was to try to draw in a schematic 3 simplified form the automatic open loop and the automatic 4 closed loop for this one as I understood it.
5 Now let me ask you, is this an AC valve?
6 MR. JAIN: Yes.
7 MR. DEARD: And you have two operators on it, two 8 open coils and two closed coils?
9 MR. JAIN: Correct.
10 MR. DEARD: And they both have to bo onorgized to 11 make the coil movo, or make the valvo movo?
12 MR. JAIN: Correct.
13 MR. DEARD: So wo end up with four operating coils.
14 MR. JAIN: Right.
15 MR. DEARD: So in this senso this valvo is unique 16 from a lot of them.
17 MR. JAIN: That is very true.
18 MR. DEARD: All right. Now did you want to take 19 a minuto and saa if this cartoon accurately reficcts the 20 drawing?
21 MR. JAIN: Okay. Lot's do that.
22 (Pauso while the parties examino the drawings.)
23 MR. DEARD: Okay. Now that you havo had a chance 24 to look at it, what did we find out?
A.t.d.r1a.,.nm, W.
25 MR. STALTER: Danically the only thing we found out
32 Sim 4a2 which we missed was the scalwin circuits.,
1 2 MR. BEARD: Have you sketched those on yours?
3 MR. STALTER: Yes, I have sketched them on here.
4 MR. BEARD: Let me just make a copy of it then.
5 (Pause.)
6 MR. STALTER: Basically this contactor has a contact 7 over hero. and it also has a contact here, and then this 8 contactor has a contact there and one over there.
9 MR. BEARD: Okay. So lot me do this with arrows.
10 This one goes to this one or here? It doesn' t make any. i 11 difference I guess.
12 MR. STALTER: It doesn't make any difference.
i 13 MR. DEARD: Then the other one is like that.
. 14 MR. STALTER: Right.
15 MR. DEARD: So that in the closed holding circuit 16 you have got contacts from both of the control relay coils?
17 MR. STALTER: Right.
18 MR. DEARD: And once this thing gets pulled in, both 19 of them get pulled in, both sets are in series so they will 20 close up and the only thing that would interrupt the scal-in 21 would be the stop switch around both sides.
22 MR. STALTER: The key to this one is that you have 23 to have both of them pull up and seal in to get either one 24 to sea.1 in.
AoM.,d n.p.n.c.. w.
25 MR. DEARD: To seal, but these signals should persist
33 Sim 4-3 1 long enough for that to take place, shouldn't they?
2 MR. STALTER: Right.
3 MR. BEARD: Now on the opening side you are saying --
4 I guess you have got it a little differently because I 5 assume that this scal-in is this one and this one i .- that 6 one, right?
7 MR. STALTER: Let me verify that. I think that 8 is the case. It almost has to be the case.
9 MR. BEARD: So the opening is a little different.
10 MR. STALTERr This seal-in is with that one. That 11 is correct. Yes, that is right.
12 MR. BEARD: Okay. So it is more associated rather 13 than criss-cross like in the closing circuit.
i 14 Can I keep this one or do I need to redraw it?
15 MR. JAIN: Well, I guess ---
16 MR. BEARD: Do you have a copy?
17 MR. JAIN: No, I ---
t 18 MR. BEARD: llow about if I swap copies with you?
19 MR. JAIN: Okay. That is fine.
20 MR. BEARD: If we generally agree that this is 21 accurate with the corrections that you have pointed out, then 22 what I would like to do is discuss for a moment how it 23 functionally works, and it seems like if you talk about --
24 le t's see now, this is the isolation valvo. Let's talk about Aotederal Reporters, Inc.
25 the opening side first because that is simpler.
34 Sim4-4 I If K-303 and 301-A both are tripped, then the valve 2 will be told to open?
3 MR. JAIN: Correct.
4 MR. DEARD: Now functionally to get those two, what 5 I have written down at the bottom of the page in I have to 6 have not low pressure in steam generator No. 1 and I have to 7 have either low level in either steam generator or low pressuri -
8 in No. 2.
9 MR. JAIN: Correct. To get the intent clear there, 10 a low pressure in No. 2 would close it.
II MR. DEARD: So the primary purpose of this is for 12 that to cause it to interrupt the opening?
13 MR. JAIN: I don't see --
I4 MR. DEARD: I am only talking now about the auto 15 open circuit.
IO MR. JAIN: I wasn' t sure where you were putting 17 your "or". Was the "or" between the low level ---
I8 MR. DEARD: All right. Look at the way it is I9 written.
O MR. JAIN: Okay.
2I MR. BEARD: At the bottom of the page the way I have 22 got it written is I have put brackets between the "and" 23 because that is the major subdivision, and then on the 24 Acolederal Reporters, Inc.
second part of the "and" there is an "or." I think that 25 is correct. I spent a lot of time trying to get it correct.
35 Sim 4-5 j MR. JAIN: Let me think for just a second.
2 (Pause.)
3 That is correct.
4 MR. BEARD: Okay. So what it really says that 5
if I have got low level any place, and I don't have low 6 pressure on No. 1, that will open this valve.
7 MR. JAIN: Yes.
8 MR. BEARD:s And the contacts are "and'ed" together 9 in the sense that of actuation of channel one, I take logic 10 one and logic three sort of "and'ed" together. So that ij is the field wiring we talked about yesterday.
12 MR. JAIN: Right.
13 MR. BEARD: Now the closing circuit. Okay. This 14 one is a little bit more complicated. Let's talk about just 15 one of the closing coils.
16 MR. JAIN: Okay.
37 MR. BEARD: And to get one of the closing coils 18 to close, I need to, I think, trip K-201-C, and I am right 19 . hand, K-201-C and do something on K-301-B, and that will 20 make up the closing circuit to at least one of those closing 21 coils.
22 MR. JAIN:- Right.
. 23 MR. BEARD: Now K-201-C I believe would be 24 tripped if I have low pressure in steam generator No. 1.
Acelederal Reporters, Inc.
25 MR. JAIN: Correct.
36
- ~
p MR.. BEARD: Now where I get in real trouble is-2 K-301-B because I got very confused last night, this close 3
inhibit circuit.
4 Now maybe rather than my trying to tell you all 5
the agony lI.went through last night, it would be easier 6 if y u tell me how it works.
7 SMR. JAIN: I will give it an atternpt. I was going 8
through.it,.too, last night because-of the other thing I 9 was working on. Is it possible to defer that for a while 10 and when we come back we could give you ---
~
11 MR. BEARD: It is all right if we defer it, and then 12 what couldtwe cover in the next three minutes. I mean I have 13 seven minutes after the hour and you said you had to leave ja .at ten after. You know,' if you want.to'just recess now,
.15 that is-fine, too, because this is-a big' complex subject, 16 asIunderstandit;'is(thatcright?'
j7 MR.'JAIN:- That.is true.
18 MR. STALTER: That'is.true.
19 MR. ~ BEARD:' And it i an important,one because ,
of our discussion yesterday of the potentiN1 for single
^
.20 21 failureprobl} ems.
22 MR. JAIN: Certainly.
~
. 23 MR. BEARD: So maybe.it would beiprudent.to recess 24 at this point and try to get together later today.
ice-tederal Reporters, .inc.
25 MR..JAIN: .That is what.I was..asking for.
b
1
, g.. . .
37
' MR. BEARD: All right. Then why don't we consider
/ S'im 'Sim .-'4-/
this meeting. recessed.
2 (Whereupon, the. meeting recessed at 10:10 a.m. )
3
~
fend Sim 4 i
5
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. ' 23 24 Ace-Federal Reporters, Inc.
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CERTIFICATE OF OFFICIAL REPORTER This is to certify that the attached proceedings before the UNITED ST TES NUCLEAR REGULATORY COMMISSION in the matter of:
NAME OF PROCEEDING: DAVIS BESSE INCIDENT (Interview & Meeting)
(CLOSED)
DOCKET NO.:
PLACE: OAK HARBOR, OII DATE: ,
WEDNESDAY, JULY 10, 1985 were held as herein appears, and that this is the original transcript thereof for the file of the United States Nuclear Regulatory-Commission.
(sigt . ,
An m . 7/f .//. NM/>$:;f/ (TYPED) GARRETTh WALSH, JR.
MYRTLt H. WALSH Offidial-Reporter Ace Federal Reporters Official Reporter Reporter's Affiliation Ace Federal Reporters
. b MARY f. SIMONS Official Reporter-Ace Federal Reporters
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