ML20129B218
| ML20129B218 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 06/11/1985 |
| From: | NRC COMMISSION (OCM) |
| To: | |
| References | |
| NUDOCS 8507290106 | |
| Download: ML20129B218 (108) | |
Text
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1
.a 2
BEFORE THE PACT F I ll D I !J G TASK TORCE 3
OF THE NUCLEAR REGULATORY COMMI S SI ON 4
5 Re:
6 Davis-Besse event 7
of June '
1985 8
9 P R O C E D D I N G S 10 11 Proceedings before the Nuclear 12 Reculatory Commission Fact Finding Task Force 13 in regard to the a f o remo nt i onc e? cvent, held at 14 Conference Room 210, Davis-Besse Nuclear Plant, 15 Oak Harbor, Ohio, commencing on Tuesday, June 11, 16 1985, at 12:30 o' clock p.r.
17 10 19 20 21 22 23 8507290106 850611 24 PDR ADOCK 05000346 T
PDR ACE FEDERAL REPORTERS I fiC.
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1 PRESENT:
U 2
J.
T.
Beard (NRC) 3 E.
Rossi (NRC) 4 Wayne Lanning (NRC) 5 T.
L.
Bell (NRC) 6 W.
D.
Shafer (NRC RIII) 7 Don Kosloff (NRC RIII) 4 8
I.
N.
Jackiw (NRC RIII) 9 Stephen Burns (NRC'OELD) 10 Steve Widenan (TED-Senior L icensing 11 Specialist) 12 John K.
Wood (TED-Fac. Engrg. G en. Supr.)
13 Ted J.
Myers (TED-Nuclear Safety and 14 Licensing Director) 15
!?.
E.
O'Reilly (TED-Staff Attorney) 16 William T. O'Ccnnor (TED-Operations 17 Superintendent) 18 Jacque Lingenfelter (TED-Technical 19 Superintendant) 20 Stan Batch (TED-Technical Projects Supervisor) 21 Terry Murray (Assistant V.P.
Nuclear-22 Operations) 23 If.
C.
Rowles (TED-Assistant to the V.P.
1
(~)
24 Nuclear)
%.)
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ACE FEDERAL R EPO RT E RS INC.
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SESSIONS PAGE NO.
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4 Driefing Conference 4
5 Tutorial Session 77 6
Equipment Status Conferenco 139 7
Region III Report Conference 172 8
9 10 I
11 12 0
13 14 15 16 17 18 19 20 21 J
5 22 23 24 ACE PEDERAL REPORTERS INC.
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1 Tuesday Afternoon Session (q
_J 2
June 11, 1985 3
12:30 o' clock p.m.
4 5
P RO C E E D I N G S 6
7 (Present:
Messrs. Rossi, Bell,
Deard,
8 Lanning, Kosloff, Schafer, Rowles, Myers, O'Reilly, 9
Batch, Lingenfelter, Murray, Wideman and Wood.)
10 MR. ROSSI:
This is going to be the 11 Licensee's briefing and overview of the summary of 12 the event that occurred on Juno 9th.
And we will O(s' 13 have a record transcribed so we can review what was 14 said and it will be there for everyone to look at 15 later.
16 And I don't know that anything more needs 17 to be said on that.
We will have the Region people P
18 present to hear what is said but they will not 19 participate in the discussions.
Any member of the 20 Pact Pinding Team can ask questions at any poi nt in 21 time and get cla ri f i ca t ions or whatever, and I will 22 make sure that the things stay orderly no we don't 23 have three people asking questions all at the sano i
(]}
24 time and that any_one person who a sk s questions can ACE PEDERAL REPORTERS INC.
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kind of proceed with his train of thoucht until
-)
%/
2 that's completed.
3 So with that, we will turn it over to the 4
Licensee.
You can begin to tell us what you want 5
to tell us.
6 HR. BEARD:
Off the record.
7 (Discussion held off the record.)
8 HR. ROSSI:
Why don't you s tate you r well, he's got the neating 9
names also just so 10 chart so maybe we don't even need to do that.
11 HR. LINGENFELTER:
I want to ask a 12 question before we ntart.
The presentation we are
/')
(
13 rakina in based on our, Stan Batch's and myself's, 14 evaluation of the events as we took them off of the 15 dologging information from the plant computer 16 systems.
17 We are'not planning to cover any details 18 in terms of any specific individual actions or what 19 is behind anybody's minds.
We are dealing with the P
20 actual events as we have them recorded in terms of 21 paraneter information, what happened when, so forth.
22 I f you have got other additional 23 ouestions on that, you can ask them.
If no can
(~)
24 answer those, fine.
We are looking primarily at
'w)
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1 the very specific sequence-of equipment events is Ls 2
what we are going to deal with.
3 HR. ROSSI:
Okay.
We would appreciate it, 4
I assume in this sequence of events, you will cover 5
things like operator actions that were taken as j
6 opposed to things that occurred automatically?
7 MR. LINGENFELTER:
Certainly.
8 MR. ROSSI:
And the other thing that 9
would be of value to us is where equipment worked 10 the way it was designed to work, tell us that, and 11 if it worked in some way that you either believe it 12 not to have been designed to work that way or it O(s 13 nalfunctioned, let un know'that as nuch as you can 14 too.
15 MR. LINGENFELTER:
Okay.
16 MR. BATCH:
This is also fairly 17 paeliminary here and we have additional 18 clarifications.
As we review this data nore, it 19 may turn out some of this may ch a n ge.
But this is 20 our best understanding at this point in time.
21 HR. ROSSI:
I understand.
22 MR. BATCH:
Okay.
The plant was 23 originally at approximately 90 percent of full
(])
24 power.
No surveillance tent was in progresp.
We ACE PEDERAL REPORTERS INC.
(202) 347-3700
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were at full automatic control except for the No.
2 7
2 main feedpump which' won at manual.
We had that 3
main feed ' pumping manual due to sono problems we 4
had previously with the main feedpump.
5 At time 01:35 in the morning, 00 neconde, 6
the No.
1 main feedwater pump tripped on overspeed 7
due to a control failure.
The ICS at Davis-Besse 8
runs back at the plant at a loss of feedwater 9
automatically.
This runback was initiated by the 10 ICS.
With the No. 2 main feedpump in manual, the 11 ICS could not control the No. 2 main fecopump.
The 12 operators attempted to increase its speed.
It 13 didn't get.high enough for the plant to make the 14 runback.
15 So without adequate feedwater for the 16 runback to occur, we ended up tripping the plant 17 out on high pressure at approximately 80 percent 18 of full power when th e high pressure reactor trip 19 occurred.
And the turbine of course trips when the 20 reactor trios.
The actual reactor trip occurred at 21 1:35:29 hours, so it was about.30 seconds or so, 29 22 or 30 seconds after the main feedwater pump trip 23 that the reactor tripped on high pressure.
(])
24 At 1:35:31 hours, the Steam and Peedwater ACE PEDERAL REPORTERS INC.
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0 f
spuriou'\\
1 Rupture control System'n Channel 2 had a O
2 half trip.
This occurs at the time, essentially 3
when the reactor tripa, the secondary side prosaure j
t 4
increases nuite rapidly, and at this point in tino 5
they are get'tino the spurious half trip in one 6
Steam and Peedwater Rupture Control channel.
This 7
is sensing a low level, but it is not a desired 8
actuation and it is not a real actuation on low 9
level but it's a half trip.
i 10 MR. BEARD:
Excuse me.
Can I ask-you, 11 when you say half trip, are you talking about no 12 actuation, but one of the coincident channels has
()
13 been tripped?
14 MR. BATCH:
That's about half right.
i 15 When one coincident channel trips, it will actuate
~
t 16 the main steamline drains which are already closod, 17 it will nake sure that one stays closed and it will 10 make sure the HSIE by-pass in closed.
It actuates 19 sone equipment that really doesn't affect the plant 20 on a half trip.
21 MR. BEARD:
So mone actions do occur, but 22 the majority on the actions on this Rupture Control t
23 System doesn't really hanpen until a second channel l
24 trip?
l ACE PEDERAI, REPORTERS INC.
i (202) 347-3700 i
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9 o
1 MR. BATCit:
That's correct.
O 2
MR. BELL:
What are the input nionals 3
into this thing?
4 MR. BATCH:
It senses loss of 5
fore-reactor coolant pumps,-low stenmline pressure, 6
low steam air level.
7 MR. BELL:
Off on what channel?
Startup i
8 range or 9
MR. DATCH:
Startup range is what it l
10 sensen.
11 MR. BELL:
But at 30 secondo in the trip, i
12 you are not even
()
13 HR. BATCH:
Wo had plenty of water level 1
14 at this time.
i 15 MR. BELL:
Why doen this occur when the 4-16 plant trips?
17 HR. BATCH:
I don't think we know yet.
18 MR. BELL:
Does it happen every tino the 19 plant trips?
20 HR. DATCH:
It happened just those last
]
21 soveral trips.
l 22 HR. LINGENTELTER:
Last two times prior e
23 to this.
24 MR. BELL:
This is the third occurrence 4
ACE FEDERAL REPORTERS INC.
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of this steanline rupturo?
r
()
2 MR. LINGENFELTER:
That's correct.
In i
3 3
all three cases, the water level that was actually 4
there was substantially above normal.
i 5
MR. DELL:
You started out pumping about 6
60 percont of the operating range, somewhere around i
7 there.
And by this timo vou are not off the i
8 operating range yet.
9 HR. LINGENFELTER:
That's correct.
We 1~
10 have seen levels of 100 inches.
There appears to i
you know, this is speculation.
Some sort of 11 he 12 a response to a pressure, a rapid pressure increase
()
13 on the secondary has some effect on one channel of 14 this.
The channel itself has been tested following 15 these other events and it responds to a normal low 16 level as required..
But there is nonething about 17 that particular transient that sets that thing off.
i t
18 HR. ROSSI:
Is it one steam generator l
19 only or 20 HR. LINGENPELTER:
We believe that to be we think it in one transmitter.
21 the caso.
One r
4 22 HR. ROSSI:
Por one staan conerator?
23 HR. LINGENFELTER:
That's cor re ct.
24 HR. BELL:
And I would like t o, if it's ACE PEDERAL RFPORTERS INC.
l (202) 347-3700 s
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all right with you,- back up to your Iten No.
I here.
, O 2
You'say a runback is initiated by the ICS.
What 3
power level do you normally runback to in loss of 4
feedpump and what's the runback?
5 HR. BATCH:
50 percent level, 55 percent 6
of 50.
7 HR. nELL:
55 percent at 50 percent per i
8 minute, if I understood correctly?
9 HR. BATCH:
Yes.
10 HR. BEARD:
Is that correct?
11 HR. DATCH:
Between 55 or 60.
12 HR. ROSSI:
You mean you run it back 55
- ()
13 or 60 percent at 50 percent per minute?
14 MR. DATCH:
That is the runback rate that 15 is initiated in the ICS.
The plant can't runback 16 at 50 percent unless 17 MR. BELL:
In a percentano it could.
18 MR. LINOENFELTER:
Possibly,.It could.
19 HR. BATCH:
That's the rate it tries to l
20 runback at.
l 21 HR. DEARD:
llow much I guess you 22 runback 10 percent before you got the tript right?
23 HR. DATCII:
Roughly.
r 24 HR. DELL:
Had the other main foodpump k-]/
i ACE PEDERAL REPORTERS INC.
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1 been on automatic, w o u J. 6 you have rode the r uti b e c k
' O 2
out?
3 MR. DATCil Ouite possibly.
l l
4 MR. LINGENFELTER:
We have in the past.
1 5
MR. BELL:
It's you r experience in the 6
past you are able to run it out with loss of l
7 feedwater pumo?
7 8
MR. LINGFNPELTER:
We want to point out 9
that the punp was in manual.
He had in the past 10 had some difficulties with the main feedpumps s
11 tripping following a reactor trip, and it appeared 12 to be that that tripping following a reactor trip
(])
13 had somethina to do wi th one of the punns or having 14 to do with the pumps being on automatic.
15 And we placed, for a precautionary reason i
16 this time around, we had one in autoratic and one i
17 in nanual.
So that if we had a reactor trip, the i
j 18 one that was in manual would not be lost.
i l
19 MR. HELL:
okay.
Now, excuse me.
When i
20 this pump is in manual, is there any effort to keep i
21 either pump speed matchnd or pump flow raten l
22 matched?
23 MR. LINGENFELTER:
Yes.
24 HR. ROSSI:
So at 90 percent power, you ACE FEDERAL REPORTERS INC.
(202) 347-3700
13 I
were sure it was supplying 45 percent of the
('#
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2 feedwater.
3 MR. LINGENFELTER:
That's the intent.
4 And the operator, when the transient occurred, 5
recognizing that ho had to try to take the niaco of 1
6 the automatic auy, tried to run the thina un, tried 7
to run the feedpurp. up but uns unsuccessful.
8 MR. BELL:
Okay.
Thank you.
9 MR. DEARD:
So far in the event as you i
10 have gotten
---wo haven't let you get very far --
i 11 but basically what I would like to understand is 12 that with the history of a few frequent half trips
()
13 on the Steam and Peodweter Rupture Control System 14 and the spurious tripping of the No. I feedpump, i
15 ovarything to this point han progresnod pretty much 16 an, quoto, normal, unquote.
I mean, there a re no l
17 bin surprises.
18 MR. LINGENFELTER:
That's correct.
19 MR. HEARD:
Okay.
20 MR.
3 ATCit :
The half tripping of that 21 Steam and Feedwetor Rupture Control channel doon 22 not cause any p.rticiilar problene in the plant 23 cither.
I don't know whether I made that clear, l
i 24 but it's not a clonificant problem to the plant ACE FEDERAL REPORTERS INC.
(202) 347-3700 l
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14 1
1 when that does half trip.
The tripping itself is a i
2 safe condition, so it's not like it's becoming 3
inoperabic at that point in time.
4 HR. BEARD:
I'n just trying to keep 5
separate in ny mind what is, quote, within the 6
range of normal and where do we begin to get none 7
interesting things.
8 HR. BATCH:
Okay.
We got through the 9
half trip of the SPRCS channel.
1 10 At 1:35:36 and 37, the No. I and 2 Main 11 Stean Isolation Valves closed.
I guess this is 12 deviating from what we would have expected at this
()
13 point in time.
There in no apparent reason for the 14 MSIVs to begin to close at this time.
MSIVs at 15 this plant are closed by a full Steam and Feedwater 16 Rupture control System actuation, but there should i
17 not have been one present at this time.
18 MR. ROSSI:
Is that the only signal that i
19 would automatically close.the Main Steam Isolation 20 Valves?
21 MR. BATCH:
The SPAS, Safety Ponturou t
22 Actuation Systen.
23 HR. ROSSI:
SPAS?
24 HP. HATCH:
Right.
(')g u
ACC PEDERAL REPORTERS INC.
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MR. ROSSI:
Okay.
So it's those two i
2 sionals that would normally be automatically i
I 3
closing the MSIVn?
f 4
MR. BATCH:
Right.
5 MR. BELL:
Is there any reaction betwoon 6
SPRCS Channel 2 and Channel 17 Is thoro, like in 7
Channel 2,
since it is a trip condition, does it B
let Channel I know it sensed a trip signal?
9 MR. BATCH:
Signal.
10 MR. BELL:
And is t'a e r e any way the trip 11 in one channel could isolate chose Main Stoan 12 Isolation valves, this half trip?
Is there any
()
13 reaction there that can cause these MSIVs to shut?
14 MR. BATCH:
One actuation trip of the 15 Steam and Paedwater Rupture Control Syston closes 16 both MSIVs, so it only takes one channel.
17 MR. BELL:
So Channel 2 actually could 18 have closed these MSIvo if it were a full trip?
19 MR. LINGENFELTER:
In other words, 20 actuation of either channel of SPRCS, onn or two, 21 could -- would close both MSIVs provided it waro a 22 full trip.
Now, wo don't the timing of this 23 particular closure on the Main Stnan Isolation 24 Valves would appear to be coincident with this half ACE FEDERAL REPORTURS INC.
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trip.
However, no other expected acto of equiprent
(~~')
2 occurred.
And past experience would lead us to
' ~ ~
3 believe again on this spurious trip that only a 4
half trip probably did occur.
So right now we 5
think that a half trip cccurred which may have 6
influenced the HSIVs.
It should not have.
7
!! R. DELL:
But it may have.
8 HR. LINGENPELTER:
Yes.
9 HR. DEARD:
Let me get a point of 10 clarification here.
I'm getting a bit con f us e d.
I 11 want to nake sure I don't got confused.
12 We are talking about instrument channels,
()
13 we are talking about Rupture. Control Syster 14 channoin and half trips, things of this nature.
let ne throw out what I think 15 And it noenn to no 16 it in and see if it is right.
A channel of the 17 Rupture Control System nay involve the coincident la tripping logic of two or more instrument channeln.
19 Por example, an instrument channel would be one 20 transnitter on say low prosaure, no there is 21 channels upon channels upon channels is what it 22 comes down to.
23 HR. LINGENFELTER:
Right.
The es 24 terminology is a little different, but I think you L)
ACE FEDERAL REPORTERS INC.
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got the right iden.
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2 MR. BEARD:
Yes.
But what occurred here 3
is actually one instrument channoi had tripped.
4 MR. LINGENFELTER:
Right.
5 MR. DEARD:
Ubich did a half actuation of 6
one logic channel, if you will,,in the Rupture 7
Control System.
8 MR. LINGENFELTER:
Right.
9 HR. BEARD:
And other than the minor 10 actuations you talked about earlier, you wouldn't 11 have expected full actuation of any MSIVn.
12 MR. LINGENFELTER:
That's correct.
()
13 MR. BEARD:
Thank you.
I hope I can keep 14 that straight.
15 MR. LANNING:
For this nequence of events 16 you are talking about, would you tell us what the 17 source of the information is?
18 MR. D ATCit :
This in a combination of 19 interviews with operators in a meeting we had 20 Sunday rornino, the Sequence of Evento printout, 21 the alarm type printout, the computer information 22 that we have availabic, in an effort to try to make 23 it all as understandable as possible.
You want me 24 many of these things were covered in many of those ACE FEDERAL REPORTERS INC.
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I 18 I
'l sources.
2 MR. LINGENPELTER:
Are you looking for 3
specific names of sources that you mioht want to 4
have later or what is you r direction?
5 MR. LANNING:
Obviously the tire schedule 6
is what the computer put out.
That's the alarm 7
printer.
8 MR. B ATCII :
Some of those " Approx. 1:410" 9
are approximate range of times there.
They may 10 have been a combination of ala ro printout and 11 operator interview.
12 MR. LANNING:
In there other printouts
()
13 from alarm printers?
14 MR. LINGENFELTER:
Yes.
15 MR. LANNING:
Fro m wha t source a re they?
16 MR. LINGENFELTER:
We have part of the 17 energency response network which establishes by 18 computer the system down,. the Technical Support 19 Center, which logo a great deal of analogue data at 20
~
high frequency.
We use that for looking~at how a
-21 the parnneters responded.
22 HR. DEARD:
In-this referred to as the 23 SPDS7 24 11 R. LINGENPELTER:
No.
It provides an input :
ACE PEDERAL REPORTERS INC.
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to t h e - S P D.S.
It's part of the same computer 2
network which drives the SPDS, but it's not a part 3
of it.
4 MR. BEARD:
I guess for the record I S
think SPDS means Safety Parameter Display Syston.
^
6 MR. ROSSI:
This computer system that's 7
in the Technical Support Center, what is tha t -
i 8
referred toas, it's name?
i 9
MR. LINGENFELTER:
That's Acquisition 10 Display System or ADS.
I will try to use that name.
11 MR..ROSSI:
Okay.
And that's an analoque 12 recording?
()
13 MR. LINGENPELTER:
Analooue.
It is a 14 digital synton, 1ut the major source of information l
15 wo are getting here was from analocuo-type 16 information.
There in also dioital information, 17 contact inputa and so forth.
18 MR. LANNING:
Is this a continuously 19 recorded storage of system paraneters?
20 HR. LINGENPELTER:
Yes.
Approximately 21 one hundred mnjor parametern aro' stored at a rate 22 of approximately onco a nocond, and thern is a 23 great deal of additional information that is stored 24 at lessor rates.
ACE PEDERAL REPORTERS INC.
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-.~_--.--.-;r.-
m-.-
20 a
1 HR. LANNING:
During all modes of 2
operation?
3 HR. LINGENFELTER:
power operation, ynn.
4 MR. BATCH:
It's a constantly rotating i
5 file.
6 MR. LINGENFELTER:
We keep a 24-hour file.
f 7
MR. BEARD:
Maybe we bottor let you get t
8 on with the nummary.
I think we are gettino off 9
more on details rather than the optimum use of this 10 first meeting.
11 MR. BATCH:
Okay.
From the timo then 12 1:35 until 1:40, we had fairly normal cost-trip
()
13 equipront operationa nuch as the auto transfer of j
14 housopower to the startup transforrors that occur 15 during the normal post-transient, post-trip 16 transient.
No. 2 noin foodpump continues to supply j
17 normal feedwater, and it takoa two, two and a half l
18 minutos to boil steam annerators down to low lovel t
19 limits where you actually start calling for i
20 additional fondwater, and that main foodpurp 21 supplied feedwater until approxinately 01:40 22 h ou r s when there was not enough steam in both our i
23 moisture separator rehnators storage tanke or the f-24 rain steam lines to keep the main steam punps i
ACE PEDERAI, REPORTERS INC.
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supplied.
2 So the steam generator'n water leveln i
+
i.
3 decreased at that point, approximately 1:41 hours, 4
to the Steam and Peodwater Rupturo Control System 5
low level trip setpoint, which is twenty-six and a 6
half inches at this point in the steam generator.
7 HR. ROSSI:
About twenty-six and a half 4
8 inches.
Right.
Wo can go into a lot 10 of detail at this point in the actual sequence that 11 happens in the next few secondo.
12 HR. LINGENFELTER:
Do yoit want me to t a lk
]
. ()
f 13 about thatS 14 MR. B ATCit Probably.
15 HR. LINGENFELTER:
I'll try to address 1
16 what happened with the SPRCS, Steam and Fe e dwa t e r i
17 Rupture Control System at this time because a la number of things occurred that providen some 19 confusion, and I'n sure we will have-to discuss 20 this inter in additionn1 detail.
21 Again, us ing yott r analogue or your 22 analogy of instrument channels and the actuation 23 channels, two-instrument channel of one SPPCS 24 actuation channel nenmod low level on one stnam uI ACE PEDERAL REPORTERS I tic.
(202) 347-3700
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22
(~s
~
this time.
That full trip of that 1
cenerator at
~'
2 actuation channel then initiated the start of the 3
No. 1 Aux Feedpump Turbine and a number of other 4
valve actuations.
I won't no into all of them at 5
this point.
6 The normal difference in instrurentation 7
accuracles between the steam generator level 8
sensino channels permitted a time delay between the 9
double actuation, the two-instrument channel 10 actuation in one SPRCS channel, that allowed that 11 channel to actuate before the second channel l
12 actuated by approximately ten, eleven secondn.
~
()
6 13 In between those times, the operator in 14 the control room who was concerned about SFRCS 15 actuation and what he had seen, that's all I know, 16 decided that a manual initiation of SPRCS should
-17 occur, and he attempted to manually initiato SFRCS.
i 13 lle-went to the panel where the nanual 19 actuation buttons are located and pressed two SPRCS I
20 nanual actuation buttons.
There are a total of ton.
21 There are two setn of fives, one set of fivo 22 actuation buttons for each actuation channel.
23 The buttons that he pushed, he decided to 24 pick the or he picked, I should say, the top two ACE FEDERAL REPORTERS I flC.
l (202) 347-3700
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buttons in both strings.
It turned out that those O
2 two actuation buttons were manual actuation of j
3 Channel 1,
SFRCS Channel 1,
low eteam pressure on F
4 Steam Generator 1, that's ono button, and the SFRCS Actuation Channel 5
accond one was actuation 6
2, low steam pressure on Steam Generator 2.-
7 So he had put into the system information 8
that lot the SFRCS th i n k -- one channel thoucht i
9 Steam Generator 1 had low pressure, main steamline
- I 10 rupture, which essentially tells the SPRCS that i
11 that steam cenerator is no longer available for 4
12 operation, and the other channel was told that the
()
13 other steam generator was unavailable for operation.
14 MR. DCLL:
Hay I interrunt you one monent?
15 MR. LINGENPELTER:
Sure, please.
l 16 MR. DELL:
This first steamlino break f
17 protection, right?
a i
)
10 HR. LINGENFELTUR That's correct.
19 HR. DELL:
So the system looks at i f one 20 steam gonorator pressure is lower than the other.
21 It doesn't look at a differential between the stean 22 generatore.
It's strictly a pressure-based synter.
23 MR. L1NGENFELTER:
- Pight, r^
24 MP. BELL:
Then there are no provinions
(>)
ACE PEDERAL REPORTERS INC.
(202) 347-3700
24 1
for a downstrean break in this nystem or a break on 2
any conmon line anywhere where both steam 3
generators vould be low to allow emergency steam 4
provisions, if I understand what you are telling me 5
correctly.
If I had a largo downstrean break, both 6
stean generator pressuren would be low and equal, 7
richt?
8 MR. LINGENPELTER:
Right.
9 HR. BELL:
But yet I could feed neither i
10 steam oenerator because this SPRCS systen would 11 prevent the addition of auxiliary feedwater.
12 HR. LINGENFELTER:
That is correct.
()
13 HR. B ATCil The one generator would be 14 pressurized.
15 HR. ROSSI:
Or both, if both MSIVs worked, 16 then both generatorn would be pressurized.
J 17 HR. MYERS:
If you ont one to gene ra te, i
la it clears itself.
19 HR. LINGENFELTER:
It clears itself.
i 20 HR. BELL:
Dut if both prosaures are low 21 and stay low, then it is not permitted to generate.
22 HR. Li tt0 Et!P ELTE R :
That's corrnet.
23 HR. DEARD:
Until there is none overrion gm 24 type action, if that's possible?
d ACE PEDERAL PEPORTERS INC.
(202) 347-3700
25 l
That le possible.
2 MR.-BEARD:
Lot me back up one more step 3
and make sure I understand it.
The low pressure j
4 senses what it thinks is maybe a rupture of the
.5 steam generator and therefore, to avoid feeding it, 6
it isolates basically that steam generator.
7 MR. LINGENFELTER:
Uh-huh.
8 MR. BEARD:
So is it roughly analogoun to 9
a feed-only-good-generator systen that was 10 energized for both of the only two steam generators 11 in th e plant, so that basically whether it is right i
12 or wrong, the buttons in effect actuated this
()
13 nystem which caused both atons generators to be 14 fully isolatod?
Yes.
Yes.
Now, there 16 is a slight difference in that now where i f you had 17 actuelly had ron11y both stear generators with n 10 low condition, low pronsure condition, both sonning
~~
19 both actuation channoin would sense low pressure on l
20 both generatora.
21 linre we had a condition where on,1y one l
22 channel, one channel saw one 9encretor, the other 23 channel saw the other generator.
So this channel, t
g 24 Channel 2,
thought Channel I was still good, and i
7J
(
ACE PEDERAL REPORTERS I !!C.
l (202) 347-3700 t
E' 26 1
1 Channel 1 th ou gh t Steam Generator 2 was still goo *.
)
2 MR. DEARD:
Now are you t a lk i ng in terms 1
3 of the instruments that it saw or the input it l
4 received via the operator pushing the manual 5
actuation buttons?
6 HR. LINGENFELTER:
The buttons that the 7
operator pushed made the SPRCS think that.
There 8
is no instrumentation.
There is no real low 9
pressure at this point.
10 MR. BEARD:
Okay.
Maybe I'm getting 11 confused again, but it seems to me that the 12 instruments fed in a signal that spuriously said
()
13 low level in one of them, I holieve, if I haven't 14 got that part confused.
15 HR. LINGENFELTER:
That's correct.
16 HR. DEARD:
Then the operator inputted to 17 the system low pressure signals, one for each stean 18 generator.
So the synten as a whole, the Rupture 19 Control Sys ten I mean, believed that there was low 20 pressure in one staan generator, and low pressure 21 in that name steam generator plus in the other 22 eteam generator.
It thought it had inputs that 23 said low pressure.
24 HR. BATCH:
Yes, and low pressure has
)
ACE FEDERAL REPORTERS INC.
(202) 347-3700 b
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2 HR. BEARD:
Same thing for both, pressure 3
level low on one, pressure low on the second.
4 HR. LINGENFELTER:
Right.
5 HR. BEARD:
And it bottled up both steam 6
generators.
7 MR. LINGEtiFELTER:
That's correct.
8 MR. ROSSI:
It does that by closing 9
valves in the auxiliary feedwater lines.
Is that 10 how it bottles'them up?
Main steam water, Main 12 Steam Isolation Valves.
()
13 MR. ROSSI:
So it bottled the Aux Feed 14 and enin steam from both generators?
15 MR. LINGENFELTER:
Now, Aux Fced is only 16 isolated when the system senses low pressure, and 17 low level isn't a problem.
18 MR. BELL:
But had it been an OSGTA, a 19 generator at normal pressure and the other steam 20 generator at low pressure, would it feed the ateam 21 generator with low pre s su re had it been an actual 22 actuation rather than a manuni initiation?
23 it R. L I N G E!! F E L T E R :
That's correct.
And r
24 in fact, what the systens attempt to do is to take C
ACE FEDERAL REPORTERS I llc.
(202) 347-3700
28 i
I
. 1 both auxiliary feedpunps and feed the good steam 2
generator.
So what you will find when you review i
4 if 3
the events, using again your example, if one if there was an actual low pressure 4
the actual 4
5
'in one generator.and the other steam generator saw 6
a normal pressure, the auxiliary feedwater pump i
+
7 associated with the bad steam generator would be f
8 lined up to draw steam from the good steam l
9 generator and provide water to the good steam j
r 10 generator.
So you.have two pumps supplying i t.
11 MR. BELL:
Okay.
1 12 MR. LINGENFELTER:
Now, we are in a h
-situation where the'SPRCS channels-again, one 13 14 channel sees one steam generator badLbut thinks the i
other actuation channel
- 15 other one is good.
.The t
16 sees the~ opposite steam generator bad or sees its i
17 own steam; generator s~ bad and says the opposite one 18 is - good.
. So they attempt to try-to take their'own
~ 19 pumpsiand-where7possible cross-feed one a n o t h e r..
~20 All right?
l 21 The. valves.that: should ve moved.to do
. did-indeed do. tha t'.
They_ functioned.theEway 22 that l
23 they; should'.have.
However, with~the individual'
- 2;4
-channels sensingLthat~its own steam generator was JACE PEDERAL' REPORTERS INC.
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29 1
bad, it shut the steam generator isolation valve, h')
2 the Aux Feed Isolation Valve just upstream of the 3
steam generator to prevent any water from either 4
pump entering.
5 So that effectively cut off all feedwater 6
to both generators in that situation, although the 7
two Aux Feed puros are now still trying to food the 8
opposite.aeneratorn.
9 HR. BELL:
Now, you have got may we call 10 them A and B steam heaters.
Is that a fair 11 terminology?
Now, the one channel will try to open 12 the steam supply to the auxiliary feedwater pump
()
13 turbine from the steam cenerator that it thinks is 14 good, is that what you said, and close the steam 15 supply to tha auxiliary feedwater pump turbine on 16 the steam generator it says is bad?
So in that 17 case those valves had two conflicting signals, one 18 to. shut, one to open?
4 19 MR. LINGENFELTER:
That's right.
20 HR. BELL:
Which took priority?
'21 MR. LINGENFELTER:
Whatever happened 22 first.
23 MR. BELL:
It's a relay' race then.
f3 24 MR. LINGENFELTER:
Right.
In the case of L)
ACE FEDERAb REPORTERS INC.
(202) 347-3700
30 4
well, wait a second.
You are 1
the No. 1 Channel 2
talking about you were talking about the valves 3
having conflicting signals.
There were no conflictinc 4
signals from the low pressure signals.
Those 5
things are covered by different, what do I want to 6
say, different actuation channels.
7 MR. BELL:
tiow about the water valves 8
then, the supply valves on the feedpump discharge?
9 Are we in a situation where, for example, the Aux 10 Feedpunn supplies to a steam genenerator without it 11
.being cpened and closed?
12 MR. LINGENFELTER:
Let me back up and say p) 13 go through the sequence again.
The first thing
(,
14 that happened on SFRCS Channel I was that it sensed 15 a low level, and certain' valves started to nove on 16 that actuation.
The only place where there was a 17 conflict was when the operator pushed the buttons 18 for low pressure.
19 Low pressure having priority, it now gave 20 signals to some of th os e same valves to close.
And 21 so what-happened is and that occurred four 22 seconds after that low level.
So for four seconds, 23 those valves were on their way opened or closed, ex 24 and then a couple-of them turned around as soon as (Y
I ACE FEDERAL REPORTERS INC.
(202) 347-3700
I l
31 j
1 they were all the way open, turned around and went l
2 hack to match the demands of the low pressure.
3 okay?
4 There are no conflicts that I an aware of.
5 When the guy pushed the two buttons, there should 6
be no relay racing going on with respect to the low 7
pressure.
Okay?
8 MR. BELL:
Okay.
9 MR. ROSSI:
Low pressure just takes 10 precedence over low' level?
11 MR. LINGENFELTER:
That's correct.
12 MR.. BEARD:
Are the actuation channels,
()
13 are we talking about Channel 1 and Channel 2,
are 14 they in direct correspondence to the two steam 15 generators?
In other words, earlier you indicated 16 something about Channel 1 senses low level on Steam 17 Generator No.
1.
I'm trying to associate
-6 I
18 think-what we are saying is Channel I had low level 19 and ranually inputted low pressure.
Channel 2 had 20 only nanually inputted low pressure.
21 MR. ROSSI:
No, I think by this time they T
22 had low level on both because you had real low
[
23 levels.
24 MR. LINGENPELTER:
That's six seconds ACE FEDERAL-REPORTERS INC.
(202) 347-3700
l 32 i
l l-I later.
l
- ();
2 MR. ROSSI:
You havon't got there yet.
L l
l 3
HR. LINGENFELTER:
But we.are close.
You l
4 are very close.
A quick rundown on the actuation
~
S channels themselves:
The instrumentation that i
16
. feeds into'the actuation channel logic comes from i-7 both sides.
It's not an Actuation channel 1 is for f
8 Steam Generator 1 and associated loops.
It looks 1
9 at both sideo of the systems, both actuation I
10
' channels look at both sides of the system.
I 11 MR. BEARD:
Are they fully redundant i !)
r 12 that. sense?
t
- ()
- 13 MR. LINGENPELTER:
In a sense, yes.
In i
~
14 terms of what.the.y actuate, no, with the exception 15
-of certain valves, of course.
You can't make it 16 easy.
i
-17 The Main Steam Isolation valves a r'e' b o th 18 closed fron both channels.
Startup feedwater
~ 19 control velves and I.think -- anything'else?
In 20 general, though, the-actuation. channels themselves
- 21 actuate the associated loop, if you will.
In i
22 general that's a true' statement.
Okay.
Now 23 HR. BEARD:
.Before you go on to the next 4
24 step, j u s t..to d e t a i l, - y ou said the operator went ACE FEDERAL REPORTERS ~INC.
(202) 347-3700 4-
..c a - -
33 1
over and intended to actuate the Rupture Control p~'
2 System.
I'm not sure whether I am reading into it 3
nore than what you said or not, but I think you 4
were implying that he intended to do it on low 5
level but at any rate he did it on low pressure.
6 MR. LINGENFELTER:
That's correct.
7 HR. BEARD:
And you say the low pressure 8
actuation buttons are the top two in two rows of 9
five buttons each.
Could you toll me where the two 10 buttons are that he intended to use,_the low level 1
11 buttons?
12 MR. LINGENFELTER:
Fourth down I think.
()
13 MR. BEARD:
Forth down?
14 HR. LINGENFELTER:
On both.
15 MR. LANNING:
Was the operator's actions l
16 confirmatory in nature or anticipatory in nature?
17 MR. BATCH:
He thought they were 18 anticipatory.
It ended up they were actually by 19 four seconds.
20 MR. LINGENFELTER:
Afterwards.
He
-21 thought he was doing it himself, but it would not 22 have been required had he not touched the huttons.
23 Everything would have_ worked as required.
.But he e
24 thought it was necessary to do.that, so he did it.
b)
ACE PEDERAL REPORTERS INC.
(202) 347-3700
(
34 1
MR. LANNING:
Based on the level.
/'"'J r
i
\\
2 f tR. BATCH:
I think the MSIV being closed 3
- also, t
4 MR. LINGENFELTER:
You have to ask him 5
what their thoughts were.
There are a lot of 6
confusing aspects.
The MSIVs being closed, which 7
would be a normally expected SFRCS occurrence.
8 There was considerable confusion.
9 MR. BATCH:
If you really want to 10 understand SPRCS, it probably would be worthwhile 11 to have a regular lecture.
12 MR. BEARD:
It's very complicated.
I
((()
13 looked at it several times over the years and a 14 week after I cot myself up to speed on it, it's 15 sufficiently complicated that unlese you use it 16 almost daily, you can get it mixed up very quickly.
17 But I have used it daily and got mixed up.
It'a a 18 very complicated system.
19 HR. B A T Cil :
There was one more ingut 20 I didn't finish my statenent.
There was 177 pound 21 DPE input that also feeds in-SPRCS.
I stopped 22 describing SPRCS before.
But there is a 23 differential steam pressure that's also input to I
24 the SPRCS, a r.d SPRCS channels do get both steam s
\\
ACE PEDERAL R E PO RT Ells INC.
(202) 347-3700
____._y 35 i
4[]
. generators inputtingito the channels but they 1
2 basically control their.own Aux Feedpumps.
3 MR.' BELL:
DidfI hear you correctly, had
{
4 the operator either pushed the low level buttons or
+
ij 5
not pushed a n y. b'u t t o n s, all the rest of this would 6
he a blank sheet of paper?
j 7
MR. LINGENPELTERs,That's uncertain..
8 That's uncertain..
4
)
9 MR..MYERS:
The plant should have l
s J
r l
10 proceeded.
t j
11 JMR. LINGENFELTER:
It should.have i
's. uncertain.
We.believe there 12 proceeded, and it i
()
13 is a probability 7that-that is the' case-had ho not
}
i'
. those buttons..
I am going to get into that i
14 pushed i
i 1
j-15 a little bit further here.
-Okay?
1 16 Now we have had one channe l with low I
both channels with a low 17 level actuation and 4'
t 18 pressure. actuation.
The No. I actuation channel 19 tried to start or started the auxiliary-feedwater i
f~
20 pump on th a t-low level signal.
The No. 2 actuation 21 channel, still again sensing that only.one steam i
l 22 generator.was1had, thought that the No. I steam'
[
i 23 generator was good and in. turn started the No. 2 i
i l
l 24 action feedwate r. pump.to try to feed the No. I h
i l
4
' ACE FEDERAL REPORTERS INC.
(202).347-3700 i
1 I
h
36 1
generator.
/~T 2
So the second Aux Feedpump was started by 3
the low pressure manual actuation.
In either case, 4
about, I think it's what, six seconda lator, the 5
second channel of low pressure, the second 6
actuation channel was received.
The SPRCS channel excuse me, saw the low 7
showed the low level 8
level on the second actuation channel, that came in, 9
it registered as an alarm, it did nothing again 10 since it doesn't have the priority.
11 All indications that we can tell up to 12 now are that all the valves actuated as required.
()
13 Everything moved in the direction it's supposed to.
14 HR. BEARDr Before you get to the second l
15 page I have a question.
Are you thereS i
16 HR. LINGENFELTER:
Yeah.
17 HR. DEARD:
Okay.
You mentioned several 18 times that when an actuation channel senses low 19 pressure on a given steam generator, it apparently 20 is configured in some logical nanner that it 21 convinces itself that that steam generator is bad 22 and it figures that the other steam generator is 23 good.
24 What I'm trying to understand is donn it (3
r
/
ACE PEDERAL REPORTERS INC.
(202) 347-3700 l
37 1
actually have some input that tells it the other
'-)
2 one is good or does it just switch away from the 3
bad one?
4 MR. LINGENFELTER:
Until it is told that 5
the other generator is bad via a low pressure 6
signal, it assures it is good.
7 HR. DEARD:
But it is an assumption.
8 There is no input to it that tells it the other one 9
is good.
It's switches to the good one as well an 10 it avoids the had one.
11 HR.
ROSSI:
But it gets pressure 12 information from the so-called good one.
()
13 MR. LINGENPELTER:
It still gets pressure 14 information from the good generator.
15 MR. ROSSI:
And because of the lack of a 16 low pressure steam generator, that's what it uses 17 to make the assumption it is a good steam generator.
18 MR. LINGENFELTER:
That's true.
19 MR. BEARD:
In this case, the operator 20 simultaneously pushed the two low pressure 21 actuation buttons.
22 HR. LINGENPELTER:
Let me describe it.
23 He pushed the top two.
The next two down a re No. 1 l
24 actuation channel, low pressure on Steam Generator i
ACE PEDERAL REPORTERS INC.
l (202) 347-3700 i
e I
L 38 1
2, and No. 2 actuation channel, low stean pressure
()
l 2
on No. I generator.
So to get both generators to 3
be recognized as bad, the operator would have had 4
to push the ton two and the next two down.
5 MR. BEARD:
So the two he did push were I.
6 related to one steam generator?
7 MR. LINGENPELTER:
No.
The two he did 8
push were related to opponito steem generators.
So 9
again one actuation channel thinks the one is good, 10 the other actuation channel thinks the other in I
11 good, considerably different than a real there 12 you ge.
This, by the way, is not the first hunan
()
13 engineering discrepancy we found in our control 14 room design.
15 MR. BELL:
That went on prior to this 16 incident?
6 17 HR. LINGENPELTER:
Yes, scheduled to be 18 changed.
19 MR. MYERS:
I'm not sure if I haven't got i
20 then 21 HR. LINGENFELTER:
You have done them i
22 backwards, but the idea is good.
23 HR. MYERS:
Low pressure 2 for 24 HR. LINGENFELTER:
The top one would ho 2 ACE PEDERAL REPORTERS INC.
(202) 347-3700
39 l
1 in that case.
It's the same numbers.
That's for 2
Channel 1.
You have got Actuation Channel 2 now on 4
I 3
the left and Actuation Channel 1 on the right.
t l
4 MR. ROSSI:
If we are going to talk about 5
what's on the board 6
MR. LINGENPCLTER:
That's why I haven't 7
drawn anything.
we have to have something.
8 MR. ROSSI:
9 One possibility is you draw it on a piece of paper.
10 HR. LINGENPELTER:
We can give vou a 1
11 drawing of it.
i 12 MR. ROSSI:
Put it on here.
Then we have 0
13 it.
14 M P.. B A T CII:
Why don't we got the records 15 here.
We may and up with it labeled wrong.
16 Let's-get the FCR view of those buttons.
it's later than 17 MR. LINGENFELTER:
'84 18 that.
l 19 MR. B A T CIl s We will supply those to you.
20 MR. DEARD:
I think the thrust of what I l
21 was trying to understand is that the buttons that 22 were pushed, one was a redundant actuation.
One 23 channel thought one steam generator was at low 24 pressure, a dif fe rent actuation channel thought the ACE PEDERAL REPORTERS INC.
(202) 347-3700 l
40 t
1 other steam generator had low pressure.
2 MR. LINGENPELTER:
That's correct.
okay.
So now one 3
HR. BEARD:
But 4
channel wants to switch away from what it thinks is i
5 the bad steam generator, and the other channel i
6 wants to switch away from what it thinks is the bad 7
So in the switching processes, 8
they block each other out.
l 9
MR. LINGENPELTER:
Essentially, yes.
10 MR. BEARD:
Okay.
11 MR. BELL:
Has there been any discussions 12 of perhaps putting a steam pressure differential of
()
13 steam generator pressures into this logic?
14 MR.
ROSSI:
I really think we ought to 15 refrain from directing that question now.
We are 16 here for information on what happened.
j 17 MR. DEARD:
It's hard e nou gh to
'i 18 understand what really happened.
I f you get me one 19 step beyond, it's 20 MR. ROSSI:
We have to refrain from that.
21 MR. BATCH:
Are we on pago two?
22 MR. BEARD:
You are right, that 01:41 f
23 time was a killer.
It took a long tima to get 24 through.
gg V
ACE FEDERAL REPORTERS INC.
(202) 347-3700
.m 41 1
MR. ROSSI:
I don't know whether you can c.b 2
clarify.
I think we skirted around the question 3
and you may have even answered it a couple of timou 4
on where you are getting two signals telling a I
5 valve to do the opposite th i n g s, which of these 6
valves will do whatever cones first and which of 7
them have a different action regarding which comes 8
first, you know, where it is overridden.
I gather 9
when you a re t alk in g about shutting off the i
10 auxiliary feed to the steam generators, if you have 11 low. pressure in the steam generators, regardless of 12 what other valves I have, I shut off the auliliary
-()
13 feed by shutting the valve in the auxiliary food 14 line into the generator.
15 MR. LINGENFELTER:
Right.
i i
16 HR. ROSSI:
But I gather when you ero l
I i
17 talkina about valves that feed steam to an
]
18 auliliary feedwater pump, that there what the valvo 19 doec may depend on what signal gets there first?
l I
20 MR. LINGENFELTER:
Well, actually there 21 are four steam valves, okay, the way it is set up?
j 22 MR. LANNING:
These are steam emission j
23 va l ve s of the Aux Feedwater Pump.
4 24 HR. LINGENFELTER:
Correct.
Off of each ACE PEDERAL REPORTERS INC.
(202) 347-3700 I
42 1
steam generator is one valve to each Aux feedpumn V
2 turbiner okay?
When the low level actuation 3
occurred, the steam cenerator supply valve from No.
i 4
1 generator to No. 1 turbine opened, as it should 5
have.
6 When the low pressure signal induced by 7
the operator was input to Channel 1,
the signal to l
8 close thet valve was given.
It was already on its 9
path open, it went all the way open and had goni t
10 all the way shut.
At the same time that channel I think that's right -- d i d that 11 opened the 12 channel do it or the other channel did it?
That l
()
13 channel did it.
Opened the supply valve from the i
14 other steam cenerator to the No. I turbine.
Okay?
15 MR. ROSSI:
So the pressure really took 16 precedence, the fact that the guy even opened the 17 steam valve lines up, the pressure took precedence 18 over the level and told the steam valves to do what 19 they unuld always do for that pronoure signal.
20 MR. LINGENPELTER:
That'n correct.
21 HR. ROSSI:
Regardlemn of what kind of 22 levels you get.
23 HR. LINGENFELTER:
That's correct.
24 HR. ROSSI:
So the pressure really took ACE PEDERAL REPORTERS INC.
(202) 347-3700
43 1
precedence.
It always takes precedence.
3 MR. ROSSI:
So there wasn't a race here.
4 The pressure just took precedence.
5 MR. LINGENFELTER:
That's correct 6
MR. BATCH:
Except some of those valves 7
have to stroke completely full open before they 8
will be allowed to stroke closed through the 9
circuitry.
10 MR. ROSSI:
Other than that, the pressure l
I 11 took definite procedence and set the valves up to 12 do what they would always do with the pressure
()
13 signals.
14 MR. B ATCII:
Right.
15 MR. DEARD:
Some valves have to complete 16 their initial motion before they turn around on the 17 priority systen..
18 MR. B A T C II :
That's right 19 MR. DEARD:
Does that inply that some 20 other valves reverse in midstream?
21 MR. B ATCil Some of then didn't have 22 signals.
23 MR. BEARD:
I see.
In nunmary, where 24 we are in you have got the two Aux Feedwaters ACE PEDERAL REPORTERS INC.
(202) 347-3700
44 i
1 cross-blocked each other, so to speak, if I can 2
make up that term, and where do we go f rom here?
3 MR. LINGENFELTER:
Okay.
This prevents 4
any kind of feed to either steam generator.
Both 5
Au x Feedpumps are attempting to come up to speed to 6
provide flow, if they can.
Steam is provided.
7 I'm not sure.
I would have to go back 8
and think about it.
I think you would find if you 9
had an actual low nrossure on both steam generators, 10 I would think you supply steam to but in this 11 particular case, there was steam going to both 12 turbines.
They cane up to speed and went out on
(')
13 overspeed, both turbines.
14 MR. REARD:
Now, this going out on 15 overspeed is an'off-normal situation.
I 16 MR. LINGENFELTER:
Absolutely.
17 MR. BEARD:
Just to set the record 18 straight on events.
This is off normal.
19 MR. LINGENFELTER:
Absolutely off normal.
20 MR. ROSSI:
Even for the case when their feed discharge valves are closed and 21 discharge 22 they are pumping against closed valves and they 23 have steam and are being told to cone up to speed,
[
,cx 24 is it abnormal for that, or do you know?
\\_]
i ACE PEDERAL REPORTERS INC.
(202) 347-3700
. _ ~
45 1
HR. LINGENFELTER:
We are not sure.
We 2
feel it should he, but I quite f ra nk ly -- we are 3
not certain that we have ever been in this precise 4
situation.
It's very confusing.
5 The testing we normally provide or run on 6
these things sets up a sequence, but it doesn't 7
produce these results, obviously.
We are trying to 8
understand.
We don't understand enouah about how 9
the governors on the turbines function.
I don't 10 know I can explain what this is.
We simply don't i
11 understand it vet.
We need a lot more information.
12 HR. DEARD:
Would it be your best
- ()
13 judgment that you would not have expected thin 14 overspeed tripping even for this configuration?
15 HR. LINGENPELTER:
That's correct.
16 HR. BEARD:
Even though it is not backed 17 up by testing?
18 HR. LINGENPELTER:
That's correct.
We
{
l 19 don't think it should have happened at all.
20 HR. BELL:
When you start this punn, like 21 if you are doing surveillance on either one of 22 these pumps to power, the valves you are talking i
23 about are norrally closed valves, aren't they?
24 HR. LINGENFELTER:
Yes.
g-V)
ACE FEDERAL REPORTERS INC.
(202) 347-3700' 4
+_.
46 1
MR. BELL:
And yet when you do the O
2 surveillance midstream to the turbine, it doesn't 3
overspeedt is that correct?
4 MR. LINGENPELTER:
That's correct.
5 HR. BELL:
Is not the same recire path 6
available in this condition as the pump recirc path?
7 MR. LINGENFELTER:
That's correct.
8 MR.
ROSSI:
So the operation of the pump 9
during the event is not known to be different than 10 the oper 4on that may occur during surveillance 11 tests with respect to having no auxiliary feed flow, 12 but having feed flow and a signal to crank it up to O
13 need7 4
14 MR. LINGENFELTER:
That's correct.
At 15 this point, it is pure speculation in regards to l
16 some potential difference that may exist in the 17 fine detail of how the go ve r no r wo rk.s that might 18 possibly explain it.
I can't say anything more 19 than that.
We need to do a lot of looking.
That's 20 the major area of concern.
i 21 MR. BEARD:
Just to make sure I 22 understand the plant status, do both of these punpa 23 correct me if I'm wrong here both of the pumps 24 were considered operable at the time of the event ACE PEDERAL REPORTERS INC.
(202) 347-3700
47 1
and'have passed their most recent surveillances, et O
2 cetera, et cetera?
3 MR. LINGENFELTER:
Yes.
4 MR. BEARD:
And on Aux Feodpump, how 5
frequently do you typically start it up?
In that a 6
monthly thing?
7 MR. BATCH:
Both these have been started 8
a week before.
9 MR. DEARD:
So they did the week 10 MR. BATCH:
They were tripped the week 11 before.
12 MR. LINGENFELTER:
Tripped the week
()
13 before, and we had testing subsequent to that.
14 MR. BEARD:
But banically the equipment 15 was operabic.
16 MR. LINGENFELTER:
Yes.
17 So given the events that have occurred up 18 to this point, up to where the pumps have oversped, 19 we have not uncovered any peculiarities in the 20 response of the SFRCS, in response of any of the 21 valves, other than the overspeed tripping of the 22 pumps.
That's the only thing we have identified at 23 this point is a concern.
24 HR. ROSSI:
You've had two equipment ACE FEDERAL REPORTERS INC.
(202) 347-3700 l.
48 1
things that apparently either were not at the time
()
2 or maybe still are not understood.
One of them is 3
this spurious half trip thing of Channel 2,
and the i
4 other one is the tripping on overspeed of the 5
auxiliary feedwater pumps.
The rest of this stuff 6
in here all workod the way you would expect it to 7
work for the signals that 8
HR. BEARD:
I don't think s o.
+
9 MR. ROSSI:
What else do you think?
10 HR. BEARD:
I thought we talked about 11 ca rli e r closing the MSIVs were not proper.
12 HR. ROSSI:
That's right.
()
13 HR. LINGENFELTER:
Those items I
14 should rephrase what I saidt it was a bad choice of 15 words.
With regards to the events from the time of 1
16 about 01:41 there, overything that happened in 17 regards to the expected SPRCS response given what 18 happened up at 1:3 5 appea red to be norral.
19 MR. BEARD:
I think in that context, you 20 are richt.
21 MR. LINGENPELTER:
Okay.
There we no.
22 At 1:42, I helieve it's 1:42 oven, the operator or 23 maybe an operator corrected the input error by I
24 resetting the trips, the low pressure trips.
In ACE PEDERAL PEPORTERS INC.
(202) 347-3700
i 49 1
other words, they figured out what the problem, 1
i 2
what they had done was incorrect and reset at the 3
same switches those trips, which basically takes 4
the low pressure trip out of the SFRCS, it clears 5
it.
Just like, you know, in a real event, had the 6
pressure dropped down and then come back up again, 7
the pressure switches would be set.
SFRCS now 8
thinks that both steam aenerators are indeed good.
I l
9 HR. ROSSI:
Okay.
That's one minute j
i 10 basically after he pushed the switches in the first t
I 11 place.
12 MR. LINGENFELTER:
Yeah.
Right.
l ()
3 13 HR. ROSSI:
The low pressure problem.
.i 14 HR. LINGENFELTER:
That's right.
i 15 MR. BELL:
Only auxiliary feedwater 16 valves are in position, right?
(
l 17 MR. LINGENFELTER:
Right.
[
18 HR. BELL:
The Main Steam Ieolation 19 Valves would not reopen.
1 20 MR. LINGENFELTER:
Would not reonen,
[
21 that's correct.
And to the best of our knowledge 1
22 all the valves required to realign to go t o the f
23 n o r ma l feed situation did move with the exception j
4 e
l 24 of two valves, the stean generntor isolation valves i
- ()
ACE FEDERAL HEPORTERS INC.
(202) 347-3700 i
r
. -... ~ -
i i
50 i
1 AP-599 and AP-608.
Those were the last two valves
)
2 on the Aux Peod lino into the steam cenerators.
4 3
They did not reopen.
They stayed in the closed i
4 position.
~
4 5
MR. ROSSI:
The namos of those valves the Aux Feed, what are the names of tho 6
are 7
valves or what are their numbers then?
~8 MR. KOSLOPP:
AP-599.
4 9
MR. LINGENPELTER:
And AP-608.
I i
j 10 MR. ROSSI:
AP-599 a n d A P-6 08.
And are i
11 they in an auxiliary feedwater line?
l i,
i 12 MR. LINGENPELTER:
They are in the f
(])
13 auxiliary feedwater linen, the last valvon up to 1
L I
14 the steam generator.
f I
j 15 MR. DEARD:
And the expected responso is i
16 these valves should have reopened when the 17 actuation signal was reset and the abnormality was 1
18 they stayed closed.
r 19 MR. LINGENPELTER:
That's correct.
I 20 MR. DEARD:
Did the operator have va l ve
?
l 21 position indication in the control room on those I
r 22 two valves?
In other words, did he know these two 4
i 23 valves had not responded properly?
24 MR. LINGENFELTER:
At sono time he did.
ACE PEDERAL REPORTERS INC.
(202) 347-3700
._m 51 I
1 HR. BEARD:
I d o n t moan did he look, but
[
O f
2 was the information available?
3 HR. LINGENFELTER:
It's availablo.
It's
[
4 available.
Some tine he figured it out because 5
th ey ended up both being opened.
{
6 HR. BELL:
Okay.
One more question.
Are 7
alarms supplied in the control room that the 8
operator does know these two auxiliary feedwater i
9 pumps are tripped?
r 10 MR. BATCH:
Yes.
1 11 MR. BELL:
So he knows from his i
f 12 enumerators, realizing there are two hundred of
()
13 then in alarm right now, but these are availabin?
14 HR. BATCll Yes.
That's correct.
i r
15 MR. BELL:
And has anyone been dispatched
{
j 16 down to the room yet to reset the trips at this i
17 point in time, 1:41, 1:427 I
18 MR. BATCII:
It wan dispatched quickly.
19 You would have to ask the operators that.
20 MR. LINGENPELTER:
We know what time they 1
t i
21 started rollino again, but I can't tell you that.
22 There is npeed indication and obviously flow..
i 23 HR. DEARD:
Going back, since we were 24 interrupted anyway, did the operator ever attempt ACE FEDERAL REPORTERS INC.
(202) 347-3700
52 1
up to this point to push some nort of a reset that l'
^^
2 would.have caused the spurious closure of the HSIVs 3
to be overridden and therefore reopen those?
Was 4
that ever in the ballgame?
5 MR. LINGENFELTER:
No.
You can't do that, 6
no.
4 7
HR. BELL:
So now we are up to four 8
different discrepancies, four things happened that 9
you wouldn't expect to have happened:
The spurious 10 trip, the two MSIVs closino, and two Aux feedpumps 11 tripping, and the final thing I have here is the 12 599 and 608 not repositioning.
(])
13 MR. LINGENPELTER:
That's probably a good 14 count, yes.
15 MR. BELL:
Okay.
16 MR. HEARD:
We are up to five, is that 17 what you said?
18 HR. DATCH:
At this point'in tire.
You 19 will have to discuss with the operators where they 20 were sending people, but they tried to reestablish 21 a Startup Paedpump and an auxiliary feedpump and 22 without main or auxiliary feedwater.
They are 23 still cooling the RCS, and at 1:45 the RCS was 24 starting to feed up to 562 up to that point at 1:45.
ACE PEDERAL REPORTERS INC.
(202) 347-3700
53 1
The operators' action at this point in time, I
()
2 would rather you t a lk with them directly.
3 MR. BEARD:
I wouldn't try to probe that 4
area.
I just thought, you know, the operator did 5
go to a panel and do something.
I was trying to 6
establish it was something unrelated to the HSIVs.
7 MR. ROSSI:
Okay.
What can he do from 8
the control room?
Can he at this point from the 9
control room reset the auxiliary feedwater pump 10 trip on overspeed?
11 MR. B ATCit That'a done locally.
12
!!R. ROSSI:
That has to be done locally.
()
13 It ow about opening these auxiliary feedwater 14 isolation valves?
Does he have a switch that can 15 do that from the control room?
16 HR. DATCil:
They weren't working with the 17 motor operator, but he has a switch.
18 HR. ROSSI:
lie has a switch, and you 19 don't know-whether he tried to use it or not?
20 In any event, they didn't open, either at 21 least automatically and naybe not manually either, 22 but you don't know about the ranual.
They did crank them off the 24 seat.
ACE PEDERAL REPORTERS I !!C.
(202) 347-3700
54 1
MR. LINGENFELTER:
Manually with a switch
(
')
2 he means.
Manually with a switch.
From the 3
control room they did not open, if they tried it.
4 MR. ROSSI:
If they tried it.
5 MR. LINGENFELTER:
We don't know that.
6 MR. ROSSI:
Okay, fine.
7 MR. BELL:
01:45, it says there are 12 or 8
13 inches of indicated level in the stean 9
generators.
When do you people consider the steam 10 generators to be dry?
11 MR. BATCH:
There are several things in 12 the nature'of the generator.
If it loses steam
()
13 pressure, i f you lost all-your feedwater and your 14 steam pressure is down, it's 960 or eight inches 15 MR. BELL:
Or steam pressure is dropped?
16 MR. BATCH:
960 and a 'oss of all steam 17 water.
I f you go dry, you will be depressurized' 18 soon, so it gives you a choice there.
19 MR. BELL:
Does this cone from B & W or 20 is that Toledo Edison's?
21 HR. BATCH:
It's our log pressure.
I 22 think eight inches may be from B & W.
I'm not sure 23 the 960 was our choice or-theirn.
,e 3 24 MR. LINGENFELTER:
I believe it's a
\\ )
ACE FEDERAL REPORTERS INC.
(202) 347-3700
55 I
combination, but it's a major variance.
()
2 HR. BEARD:
Point of clarification.
When 3
the operator reached the manually inputted low 4
pressure signals and caused the f eedwa te r isolation, 4
5 the Aux Feedwater Valve should have reopened and 6
apparently did not.
What about the main f o odwa t er 7
valves?
Should they have reopened?
8 HR. BATCH:
No.
9 MR. BEARD:
They were intended to stay 10 closed, and they did stay closed?
11 MR. LINGENFELTER:
Yes.
The low level 12 trip is still int that continues.
In other words,
()
13 the low level trip that had initially occurred.on 14 No. I generator or Fo. I actuation channel and then 15 followed up on No.
2, those were still in.
Him 16 resetting those low pressure trips did not affect 17 the low level trips.
Okay.
Then from time 1:45 to 19 1:51 we had RCS Tave increasino due to lack of 20 primary and necondary heat transfer.
RCS pressure 21 was-increasing due to this and heating up of the 22 p rirary water.
RCS pressure increased, due to the 23 water we were putting in the pressurizer, went up 24 to the Power Operated Relief Valve setpoint, 2425
}
f r
ACE FEDERAL REPORTERS INC.
(202) 347-3700-1
56 1
poundo, and the power Operated Relie f Val ve cycled 2
a total of three times, relieving p re s s u r i z e r 3
prossure to the Quench Tank.
And the Quench Tank 4
did accept all the relief off the Power Operated 5
Relief Valve.
The rupture disk, we did not cet up 6
to the rupture disk setroint.
7 MR. BEARD:
What was the capability to 8
nakeup the primary system at that point?
You said 9
you had two makeup pumpe.
10 MR. BATCH:
Both nakeup pumps.
We have 11 pressurizer level at this time, so it would have 12 been shut off.
13 The third time the Power Ope rated Relief 14 Valve opened, it didn't appear to reset at th e 15 proper pressure and the operator closed the block 16 valve.
Later they opened the block va l ve and the 17 power wan received.
An a precautionary measure he 10 closed it.
19 At 1:51 hours, the operators placed the L
20 Startup Peedpump in operation, and we ar7 aupplying 21 the No.
1 steam aenerator with it.
This steam 22 generator presenre had reached a minimum of about 23 750 pounds at the time he started feeding it, and f,
24 repressurir.ed to approxinately 900 pounda from the ACE FEDERAL REPORTERS INC.
(202) 347-3700
57 1
startup foodpump.
f) k/
2 MR. ROSSI:
Now, the 750 pounds in onn of l
3 the criteria _for saying that under these 4
circumstances you have an empty steam generatort is 5
.that correct?
6 MR. BATCH:
Anything less than 960.
-7 MR. ROSSI:
So that would tell you this 8
steam generator was empty at that point?
9 MR. BATCH:
Yes.
10 MR. LANNING:
What's the difference 11 between a startup feedwater punp and an auxiliary 12
.feedpump?
e
()
13 MR. BATCH:
Our startup feedpunn is a 14 electric motor driven pump, which is in the 15 auxiliary feedpurp room.
It does not have nn 16 automatic signal fron our Steam and Feedwater 17 Rupture Control System.
It's used mainly for 18 startups and shutdowns after our main'feedpumps are 19 not being used up to about one percent power is all 20 we use them for.
21 MR. LANNING:
So it's normally not used 22 in a safety capacity?
23
.MR.
BATCH:
It is capable of being used rw 24 in a safety capacity.
(-)
ACE PEDERAL REPORTERS INC.
(202) 347-3700
~.. ~
58 i
1 MR. LINGENPELTER:
The operator had 2
quidance in the emergency procedures to use the i
3 Startup Feodpump in this capacity at that point.
4 MR. LANNING:
Do you take credit in your 5
analysis for this startup feedwater punp?
6 MR. MYERS:
I can answer th a t.
In the 7
post-THI loss of all feedwater conditions for D & W 8
power plants, we take credit for the electric 9
nonsafety-related Startup Poedpump and it is 10 provided with capability to operate without off-site 11 power availabic.
It le not in the oricinal design i
12 of the system in the PSAR stage taking credit for
()
13 the original design analysis.
14 MR. ROSSI:
Dut it can be operated 15 without any off-site power.
16 MR. MYERS:
That's correct.
It's 17 proceduralized as a result and accepted under the 10 post-THI D & W loss of all feedwater conditions.
j 19 HR. LANNING:
Is this pump added as pnrt i
20 of the first THI requirement?
21 HR. IfYE RS :
No.
It was an installed pump.
22 It was modified, power supplies were modified as a 23 result, being nble to be fed from on-site power.
i 2 <4 HR. ROSSI Is it covered by requiroments ACE FEDERAL REPORTERS INC.
(202) 347-3700 1
.e
,n--
59 1
in your technical specifications?
Are there LCOs
(~)#
'~
2 and that kind of thing on this.punp?
i 3
HR. MYERS:
I don't believe it is.
I 4
HR. ROSSI:
It's not included in the 1
5 technical specifications.
6 HR. BEARD:
Do you consider it to bn a 1
7 safety-related piece of equiprent?
8 MR. MYERS:
It's not designed for that.
9 HR. BELL:
That startup feedwater pump,
^
10 is it powered from noavital AC or fron vital AC7 11 MR. MYERS:
Non that can be fed back from 12 vital AC.
i
(])
13 MR. DELL:
So ifa real loss of off-sito l
14 power occurred, the operator would have to 15 interrupt the bust thin was supplied f rom and 16 supply the bust from the DC7 17 MR. MYERS:
I'm not surn of the proceduro.
la MR. LINGENFELTER:
That's correct.
l 19 HR. DELL:
And that's why it was backfitted, l
20 It was just a procedural change?
21 MR. MYERS:
That's correct.
l 22 HR. LINGENFELTER:
Another problem that i
23 occurred prior to this, I believe, just nequential
)
24 point, SP7A, the startup feodwater valve on the ACE PEDERAL REPORTERS INC.
(202) 347-3700 s
1 60 l
1 for the No. 2 generator would not open or could not O
S~'
2 be blocked, is that right?
They had trouble 3
they had tried, the operators had tried to open the j
4 startup feedwater valve to the No. 2 steam i
5 generator to use the Startup Feedpump to supply No.
l 6
2 generator, and the valve either could not be 7
blocked or wouldn't open.
But in any caso it 8
wouldn't open and so they decided to feed No. I t
9 generator.
That in also something we are wo rk i ng 10 on.
11 MR. BEARD:
So that's another equipment 12 probler you are working on.
()
13 MR. LINGENFELTER:
Right.
14 MR. DEARD:
While we are at this point, 15 about the timo you get the start feedpump running, 16
<I would like to got to the position where you have 17 heat removal capability.
Can you back up just a i
18 bit and tell us what the conditions were in tho 19 rrimary systen in terms of heat temperaturos and i
I 20 saturation or margin to saturation or anything 21 along that line?
22 HR. BATCH:
Max Th we had noen was 23 approximately 593 degrees, in that neighborhood.
24 Primary pressures got up to tie PORV netpoint, O
l I
ACE FEDERAI. REPORTERS INC.
l (202) 347-3700
. _ _ ~ _ _
G1 1
which was around 2425 pounds.
All four reactor
/'T
~'
2 coolant punpa were on at high RCS, but with the l
3 subcool margin, we didn't have to shut off our
.i i
)
4 reactor coolant pumps.
The Th's and TDs should I
i l
5 have been roughly the same at 592.
6 MR. LINGENFELTER:
The thermal couple i
t 7
registered six hundred.
t O
MR. BATCH:
Their accuracy was probably 4
9 loss.
t
?
10 HR. DEARD:
Would you any the core 11 cooling condition was such you had a substantial 12 margin before you not naturation?
()
13 MR. LINGENPELTER:
Yos.
14 HR. DATCit:
At 1:52, the No. 2 auxiliary 15 f oodpuen was returned to operation, fed th e No. 2 16 steam generator with that.
17 HR. BEARD:
Excuno no.
What was involved i
18 in getting the No. 2 feedpump into operation?
It 19 seemed like, as I remember you saying, it earlier i
!=
20 tripped out on overspeed and people were dispatched
[
21 to the area.
22 MR. D A T Cil s Local resetting of the i
i 23 auxiliary speed pump had to be dono, and you should I
+
i 24 probably talk to the operators that were in the O
ACE FEDERAL REPORTERS INC.
I (202) 347-3700 I
r
t L
62 I
room to got exactly what steps they took.
There is 2
a valve and it has to be manually cranked down and i
3 a trip mechanism reset and cranked back open.
4 HR. BEARD:
Okay, but basically would it 1
5 be a fair description to say that the procedure
}
6 that was followed was if the trip had been spurious 7
and the system was basically reconfigured to a 8
normal configurrition following a spurious trip and 4
9 then a start was attempted and then this start was 10 successful in the sense it did not trip out an i
11 overspeed again, or am I nischaracteriring it?
[
12 HR. D ATCII :
They had some problems f
()
13 getting it back right away.
I don't know.
14 MR. L Ill0 E N P ELT E R :
Maybe I think I can 15 touch on your question.
To get the pump restarted 16 again, the stean valves which were confioured by 17 the SPRCS were ntill in the opened position.
The 18 only probler with the turbinos, the reason they 19 weren't running was that this trip throttle valvo 20 richt at the turbine itself, which is not actuated 21 by SPRCS, it tripped tonclose on overspood.
Sn 22 what they had to do was go down and manually crank 23 that thing open.
Since ovarything else was already 24 lined up, their act of cranking it open then O,
p ACE FEDERAL REPORTERS INC.
I (202) 347-3700 i
I
i 63 1
induces steam into the turbino.
It's not like they
()
i 2
put it all the way back and pushed the button.
I 3
MR. DEARD:
I son.
t 4
HR. BELL In this No. 2 action turbine 6
I l
I
(
5 returned under operator control or under automatic l
6 Control?
7 MR. DATCH:
It was manual control.
L 8
MR. BELLS Manual control.
And that's 9
another thing that wouldn't have been done normally.
10 HR. I.INGENFELTER:
Let's back up.
No. 1 11 Aux Feodpurp turbino, both of them went otit on 12 overspeed trip.
The operatorn attempted to remet
! ()
13 both of then locally, and again the exact nequence l
14 you are going to havn to talk to them about.
nut 15 they had some troubles resetting I believe it was 16 the No. 2 l
l 17 MR. D A T Cft :
I'm not sure.
turbine.
I'm guessinq la MR. LINGENPELTMR:
19 now, but they had some troubles resetting at least 20 one of the turbiner.
When they finally got them 21 back up and running, the No. 2 turbine was being 22 controlled from the control room in nanual, which f
23 is a normal activity, the ruanon being that on n 24 nornal actuation of the pumps and an autonatic
)
l ACE PEDERAI, REPORTERS INC.
(202) 347-3700
{
l h
{
64 1
control, the control is a cyclic level control, on/off O
2 strictly, and that is not a desirable. docan't have 3
a desirable impact on the operation of a steam 4
generator.
So they are used to, once the thing 5
comes up to its normal feedwater level, taking 6
manual control of the pump and controlling it.
In 7
this particular caso, they took manual control from 8
the control room of the No. 2 feedpumn and dealt 9
with it at that time.
10 HR. BELL:
But before the stean generator 11 was at i ts normal level.
12 HR. LINGENFELTER:
That's correct.
In
-( )
13 that sonne it's unusual.
14 MR. BELL:
So in that sense it's unusual.
15 HR. LINGENPCLTER:
That's correct.
The 16 No. 1 pump could not he controlled for nome reason 17 from the control room, either automatically or 18 nanually, and they ended up controlling it at the j
10 local station with a throttle valve controlling the
[
20 speed with communications to the control room.
21 HR. RELL:
Who makes these auxiliary i
22 feedwater purp turbines?
f f
23 HR. D ATCtl e Terry Turbine Company.
l 24 MR. HYERS:
Do you want to montion the O
ACE PEDERAL REPORTERG INC.
(202) 347-3700 i
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65 1
governors systems are different as insta11od'
[
2 HR. ROSSI:
You mean the governors 3
systems for the two pumps are different?
4 HR. LINGENPELTER:
That's correct.
Wo 5
are in the process of trying out one pump on an 6
electronically controlled governor.
I don't know
(
7 enough of the details about it.
8 MR. DEARD:
Why are you in the process of f
I 9
trying a new governor?
10 HR. nATCH:
Increased rollability.
}
11 HR. DEARD:
Is it because you experienced 12 governor problems in the paet?
f
()
13 MR. LINGENTELTEA:
Some types, yes.
14 Nothing quito like this.
[
1 15 HR. nEARD:
I don't nean related to this f
16 event.
I was trying to get the background of why j
17 you have a different novernor act up.
1 10 HR. NURRAY:
I, e t me add a little to that.
i P
r 19 Wo had some probices.
The vendor had said they 20 would not a now improved version, suggested this 21 use, and in light of past problems in support of I l
22 think it was even being phased out as not beino n 23 current model, obsolescence, various reasonn there, i
24 we decided to go to a newer version of the lloodward Os ACE PEDERAL REPORTERS I llc.
(202) 347-3700 i
--,.---_--.-u-------x--.
a
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66 i
I governor.
And that's why -- and before we jus t put
()
l 2
them on both machines. we thought we will put one
)
l 3
on now and run through one cycle and then replace f
)
i 4
the second one.
So we are in that intermediato i
i 5
area right now.
So we have a new one on No. 2 and i
6 an old one on No.
1.
l 7
HR. DEARD:
In the application of this t
I G
governor. this new one, something I think you nald i
l 9
was in at the suggestion and certainly with I
10 concurrence with the vendor?
1 I
11 HR. HURRAY:
Yes.
l i
12 MR. BEARD:
Okay.
(])
13 HR. HYERS:
A special testinn progran and I
14 everything was developed.
I i
i 15 HR. DEARD Are we drawing to the end of 1
1 16 this event?
17 HR. ROSS!:
There is another l
i i
10 HR. BEARD:
At a rapid pace hero.
f f
19 HR. ROSSI:
I think we have noen i
20 questions on subcool margin, i f you happen to know l
t i'
21 what they were using to got that.
Maybe that's
[
j 22 more appropriately addressed to the operators as to j
23 how they --
i 24 HR. DATCit They have redundant TSAT O
i ACE PEDERA!. REPORTEHG INC.
(202) 347-3700
i 67 l
l t
f 1
meters in the control room.
()
i 2
MR. HOSSI And they were usino those l
?
l 3
throughout this?
[
4 HR. BATCH:
You can ask the operator what i
5 they were using, but they knew they had adequato l
6 subcool margin.
The pressure up an high it was.
[
7 that really wasn't a concern.
8 HR. HEARD:
I f we a re at the and of it. !
9 think for me personally, I would be very interested f
i 10 in just reviewing this thing and going through it l
11 and gettino a count that we can agree to no to the 12 initiator of the transient and the nurbor of f
()
13 equipnent anomalion and the numbe r o f peonin
{
14 anomalies we can all anroe to as a count.
l 15 HR. ROSSI:
Yeah, I think that would be I
{
l 16 useful.
{
i 17 HR. HMARD:
And if nobody objects, it i
18 would saem like the tripping of t h e !! o. 1 main L
r 19 feedpuro due to a control failure at 1:35:00 in the
[
t 20 morning in I would prefer to en11 the initiator of j
l 21 the transient on the plant and count subsenuent t
i 22 things as other failures and other anomalies or 23 other assunntions.
Haybe we could just go down 24 through it and count them as we 90.
O.
f ACM PMDER A!, D EPORTEHD ' !!!C.
(202) 347-3700 i
f f
._ -._~...- -
. ~.
68 h
1 Seems like spurious half trip on the
. ()
l 2
Rupture Control System Channel No. 2 at 01:35:31 la 3
an anomalous situation.
It may not be of great 4
significance, but that is an equipront miedohavior, 5
failure, if I may use that term.
i 6
MR. LINGENFELTER:
Yes.
7 MR. DEARD:
And the spurious closure of 8
two MSIVe seems to be either Item No.
2, or No. 2 i
9 and 3 depending on how you want to count it.
f 10 Maybe you can giva um a feel an to I
i 11 whether or not the controln and actuatic.n of the 12 MSIV at this plant are such that you would considor
(])
13 this one avnnt or two separate ovents' i
(
14 HR. LINGENPELTER:
I think we think it f
i 15 was two, two separates.
I I
16 MR. DEARD:
Two neparates, okay.
17 And then 1 guess the way I see it, the l
18 nort thing I see on the paper here was the operator l
f i
19 action which manually inputted low steam pressuro i
20 into the pupture Control System as I don't want to 21 call it a failure but an item of interest.
i 22 HR. LANNING:
So that's four.
t i
1 23 HR. DMARD:
According to my count it's t
i 24 four subnequent to the initiator problem.
ACM FEDERAL rep 0RTER8 INC.
(202) 347-3700 l
i
69 1
And then I guess five and six becono each O
the Aux Feedwater Punp trips.
2 of 3
MR. ROSSI:
Wait a second.
The valve not 4
opening came first, Qidn't it, or did it?
5 MR. DEARD:
No.
I think tha valvos not 6
opening is at 01:42, and what I'm talking about is 7
01: 41.
8 MR. LINGENFELTER:
That's correct.
9 MR. BEARD:
So the way I count it, i f we 10 are up to the point where both Aux Feed Punpa are 11 trippnd, we count six7 There is six interesting 12 things so far.
13 The two Aux Feed valves failing 9o roonon
()
14 appear to be seven and eight.
15 The P0HV appearing to reset I think nny 16 bo one, nay not be one.
I don't know at this time.
17 Maybe we should count it an one right now, just to 18 nake sure it gets adequate attention later and if 19 it turns out to be appropriate, take it off the 20 list.
let na finish the 21 Do you have any feel 22 count.
23 I think the next iten would ho I think 24 you said a valve from the startup feed pump to the
)
ACE PEDERAL REPORTERS INC.
(202) 347-3700
70 i
1 No. 2 steam generator experienced some type of
()
i 2
problem, SP-7A?
i 3
MR. LINGENFELTER:
SP-7A, yes.
4 HR. DELL:
That's alpha, 7-alpha or 77 i
7-A.
l
{
6 MR. ROSSI:
SP-7A, right7
[
i 7
MR. LINGENFELTER:
Yes.
j l
8 HR. REARD:
The next one according to my l
j i
9 count was at 01:55 when I believo you indicated 10 that for the No. 1 Aux Peadpump, that either an i
i 11 automatic or control room manual of the Aux 1
12 Feedpunp could not be controlled and had to be donn 1
O la locatly, tocar to the enuinmene.
That would ie the l
14 next one.
Is that the end?
15 HR. HELL No.
I have not one more, and j
16 that's that Manual Aux readwater control of tio. 2 i
17 Aux Feedwater Pump Turbine was initiated beforn it l
t la would normally have been initiated.
It was i
19 initiated before the staan generatorn we re at the 20 correct level, if I hoard you richt?
21 MR. L!!!G EtlP ELTE R :
Yes.
I 1
t 22 HR. D ATCli s That's a separate item.
[
23 HH. L ! tl0 M N F E L T E R :
That's a separate it<tm 24 from what you said.
That's nn additional one.
f
. O p
{
ACE FEDERAL Rt:PORTERM INC.
j (202) 347-3700 l
I r
l f
I i
[
P 71 1
1 There may have been l
2 MR. BELL:
So number eleven by my count i
3 is that No. 1 APW pump turbino did not operato 4
correctly, had to be controlled manually with a 5
trip throttle valve which is different from the i
i
't 1
6 nanual control room.
i 7
HR. LINGENFELTER:
That's correct.
And O
your item was No. 2 Aux Feedpump was manually --
4 9
controlled manually instead of nutomatien11y, that I
i l
10 was i
i 11 HR. BELL:
At a point where it would not t
i t
i 12 have normally buon in manual.
I f
()
4 13 HR. LINGENFELTER:
That's correct.
14 MR. ROSS!:
That was from the control l
f l
15 room.
i 16 HR. b!NGENFELTER:
It was from the 1
17 control room is whnre they controlled it.
I'n not i
i t
16 elear on that point, there may have been some i
lo prob 1nns with the automatic control.
I don't 20 recall.
i-21 HR. nEAMD:
!. e t me count them up here.
l I
22 havn ont the initiator plus one, two, three, four, 23 five, mix, anven, nicht, nine, ten, clavan, twelve j
i p
24 question nrons.
f s_)
[
ACE PMDERAL REPORTEMG IHC.
(202) 347-3700 i
8 F
I L
.~ -
i I
72 i
t i
1 HR. L I ll G E N F E L T E R :
That we have discuaned i
I) 2 right now.
i 4
i l
3 HR. BEARD:
That we have discuened right t
i i
4 now.
4 i
l l
5 HR. LINGENPELTER:
Now, there are other i
6 things additional to thin that were other odds i
I 7
and ends.
Do you want to no through all of our
[
a list or --
l 1
9 HR. HEARD:
I don't think so.
I'm not l
1 l
i 10 sure I'm up to it.
I think just a summary of it is l
{
j 11 that in this event, there was a plant initiator and j
I 12 twelve interesting anpoets if someone asked me to l
(])
13 s u mma r i r.o it, and there probably are others but !
i i
14 p reit ure those are more minor in nature.
d i
j 15 it R. f,1 NG E N F E LTE R :
Relatively rinor.
I j
16 MR. nHARD:
I would ste nge s t a break.
i f
17 Ita ve we finished?
't 18 HR. DATClis Would you like a copy of the 19 transient traces?
i i
4 20 HR. REARD:
Yes, very ruch.
21 it R. DATCit We have two. copies available j
22 for you.
I f you have any. questions or need an
[
i i
23 explanation, please come see me.
Thny are not 24 totally self-explanatory but with a few minutes of --
ACM FEDE R A! R EPO R*.'M RH I llc.
(202) 347-3700 t
1 i
73 i
1 HR. DEARD:
Could you tell us from the i
j 2
record where these came from?
There are generated 3
from the analogue-type comnuters where it koops a 4
t 4
24-hour record?
l r
HR. LINGENFELTER:
Correct.
l 6
HR. HELL:
It's not an analooue computer.
j f,
l 7
HR. ROSSI:
With analogue inputs.
i 0
HR. LINGENFELTER:
Correct.
[
l 9
HR. LANNING:
In it possible to not the
[
i t
10 data that goes with these plots?
7 t
i 11 MR. L I t!O EN PELTE R :
Yeah.
i i
l 12 HR. L AN!!! NO :
Can we get a copy of that?
i
! ()
13 HR. L I NG EN PH!.T E R :
If you need two
== we 14 can ont you one.
15 ff R.
L Atl N I N G :
Let's discuss it.
f 16 HR. DATCH:
One-second data for a half I
17 hou r i s that thick.
We have it, but t
18 HR. POWLMS:
You also want the alarn
[
19 printouts.
I 20 HR. ! !!!OENFMLTER:
You are going to enke i
21 up a list of thoso.
[
i i
22 HR. BEARD:
We hava l'enn work i ng with i
i 23 nill on things.
i
]
24 HR. RELLe Hay I ask one more question?
I ACM FMDMRAL REPORTERD f ilC.
I (702) 347-3700
[
I L
i i
74 L
1 You had a trip last week?
O 2
HR. LINGENFELTER:
Ui-hub.
h 3
MR. HELL What, can you nive me a date?
i 4
HR. LINGENFELTER:
The 2nd.
t i
1 5
HR. DELL:
So you tripped 6-2-05.
And 6
when did you restart after that trips The sann day?
I 7
HR. LINGENFELTMR I forg3t.
l 8
!!!1. MURRAY:
Tuesday I believe.
I l
l 9
believe it was Tuesday.
j 10 HR. KOSLOPF It would have been the 4th.
11 Tuonday is the 4th.
i 12 HR. HURRAY:
Let no look it up.
On the O
is 4ew.
I 14 HR. RELL The roanon ! ask, it affects
[
I 15 the KE level.
?
16 MR. HOPRAY:
On the 4th we were critica!
f 17 at 02:47 on the 4th.
18 HR. IIELL :
Why weren't you at 100 perennt i
19 power.
Why 90?
[
t do you havn i
20 HR. ROCGIe The 90 percent 21 a limited 90 percent r i tt h t now for nome reason?
22 HR. HURRAY:
We are holding to not r
23 greater than 90 percent because of some noiso l
l 24 mirJnal
- some noise on our HC8 flow alonal which i
./
i s
A C11 P t:D f;IT AL R UPO RT P'H 8 I IIC.
(
(202) 347-3700 i
i i
J
75 1
will pick up the trip in the flux, delta flux flow
'()
l 2
portion of our delta PS.
So until we get the noise 3
filtered out, we are staying down low enough no the 4
peaks don't hit the trip point.
5 HR. BEARD:
Personally I would like to t
6 say this break, if we can call it that, thin 7
discussion has been extremely onlightening.
I know 8
there have been some hard spots because it's 9
difficult because equipment is very complex to not 10 through it, but I have learned a lot and feel like 11 I have at least a good authoritative feel for what I
I l
12 happened.
l
()
13 We had some information before we left 14 D.C.,
and ! feel like now we not very authoritative
(
4 15 information as to what took place.
l l
l 16 HR. MllRHAY It's our plan to continun j
17 providing information and hoino 100 percent in cooperativo in your inventination.
j 19 HR. ROSSIe
!.ot's see.
We are goino to j
20 break now.
Why don't we discusa a little hit after l
21 the break whether we want to ask them any more t
22 nuentions that we think about before we no on to l
t 23 the next iten, t*ecause we eny think of something.
t 24 Presunably we ray not went to talk to you.
If e May
)
ACK PEDMRAr nMpoMTERn Illc, I
(202) 347-3700
76 1
want to come back to you later on, but we will talk O
2 during the break and nee if there is anything more 3
wo want to ask right now.
4 MR. HURRAY:
Okay.
5 MR. RossI:
If not, wo will go on to the 6
next item in our agenda.
Thank you.
7 (Thornupon, a recess was taken at 2:05 8
o' clock r.m.)
I 9
10 11 12
()
I3 14 15 16 f.
17 10 19 20 21 22 l
23 I
()
ACM PRDMRA!, REPORTMR8 INC.
(202) 347-3700
)
l
s.
o SEQUENCE OF EVENTS SCMMARY June 9. 1985 t
The following is a summary of the Sequence of Events that occurred at Davis-Besse on June 9. 1985. The plant was originally at approximately 907. of full power.
No surveillance testing was in progress. The plant was in full automatic control except for the #2 Main Feedpump which was in manual, Ties Event 1
01:35:00 The #1 Main Feedwater Pump (HFP) tripped on overspeed due to a control f ailure. Automatic plant runback initiated.
Due to the reduced feedwater flow available. Reactor Coolant System (RCS) tempe,rature and pressure increasing.
Plant ran back to approximately 80% of full power.
01:35:29 Reactor tripped on high RCS pressure (2300 psig).
Turbine trip f rom reactor trip.
01:35:31 The Steam & Teodwater Rupture Control System (SFRCS). Channel 2. spuriously half tripped.
01:35:36 Main Steam Isolation Valve (HSIV) #1 closed.
01:35:37 HSIV #2 closed.
01:35 to Normal post trip equipment operation. such as 01:40 the auto transfer of housepower to the startup transformers, etc.
The #2 HTP continued to supply normal feedwater until approXim4tely 0140 hours0.00162 days <br />0.0389 hours <br />2.314815e-4 weeks <br />5.327e-5 months <br />, when there was not adequate steam to operate the HFP turbine due to the closure of the HSIV's.
Approc. 01:41 Steam Generator water levels decreased to the SFRCS low level trip setpoint. The STRCS actu-ated. The Control Room Operator at this time also actuated the SFRCS manually, however, he incorrectly actuated the STRCS on low steam pressure instead of the desired 109 steam generator level.
, 'Segt:cce cf Ev::cs Summary - 6/9/85-
=
Paga 2 x.
01:41:31 The #1 Auxiliary Feedpump (AFP) tripped on overspeed.
01:41:44 The #2 AFP tripped on overspeed.
01:42 The operator corrected his error by clearing the manual STRCS actuation on low steam pressure.
However. since the AFP's were tripped. no feed-water was supplied by the ATP's.
01:45 Both Steam Cenerators had stessed down to approximately 12-13 inches of indicated level.
i RCS Tave approximately 562*F.
01:45 - 01:51 RCS Tave increasing due to lack of primary to secondary heat transfer.
RCS pressure increasing due to decreasing density in RCS water and in-creasing pressuriser level.
RCS pressure in-creased to the Power Operated Relief Valve (PORV) setpoint (2425 pois).
PORV cycled a total 4
of three (3) times, relieving pressuriser pres-sure to the Quench Tank.
01:51 Operators placed the Startup Feedpump (SUFP) in operation to supply the #1 Steam Generator. The
- 1 Steas Generator pressure had reached a minimum of approximately 750 peig. The #1 Steam Generator
{
repressurized to approximately 900 peig from the startup feedpump.
i 01:52
- 2 ATP returned to operation by operators to supply the #2 Steam Ce'. orator. Maximum RCS temperature had reached approximately 592'I.
Steam Generator #2 level restored. The #2 1
Steam Generator had reached a minimum of 920 psig.
01:55
- 1 ATP returned to operation by operators to supply the #1 Steam Generator.
Stone Generator
- 1 level restored.
01:$8 Tave restored to normal post trip temperatute.
s
/
', ' '
- S:qu:nco cf Ev::ts Summary - 6/9/85 Paga 3 Additional Notest Adequate subcooled margin was available throughout the transient.
The Reactor Coolant Pumps remained in operation.
The Quench Tank contained the discharges f rom the PORV. Makeup /Iligh Pressure Injection cooling of the RCS was available as a method of core cooling at all times.
This data is preliminary and additional clarifications or correc-tions may be necessary after a detailed analysis of the event.
SNB nif 6/10/85 d
5
I E,.
e'.,
CHRQ;10L0titCAL GECUENCE OF EVENTS LLI EMI 1:04:21 MAIN FEEDWATER (FW), FLOW INCREASES j
1:04:28 REACTOR POWER BEGINS TO INCREASE DUE TO COOLING OF 1
REACTOR COOLANT SYSTCM (RCS) BY INCREASED FW FLOW 1:05: 0:!!5 MAIN FEEDWATER PUMP (MFP) TURDINE #1 TRIP 1:!5:01 UN!T DEGIN5 RUNBACK TO 55% FouER 1:!5 ::
LOW FEEDWATER (FW) FLOW ALARM (TRSL) 1:05:07:975 RPS CH : REACTOR COOLANT SYSTEM HIGH FRES3URE TRIP 1:05:00:145 REACTOR TRIP CONFIRMED 1:05:00:010 MAIN TURBINE TRIP 1:05171 STEAM AND FEEDWATER RUPTURE CONTROL SYSTEM (SFRCS)
STEAM GENERATOR (SG) LOW LEVEL HALF TPIP (SOE RECORDER SHOWS THIS AS A FULL TRIP AT 1:05:00:905) 1:05:00 SFRCS SG LOW LEVEL HALF TRIP CLEARS (SOE SHOWS THIS AS AN SFRCS FULL TRIP CLEARING AT 1:05:04 70) 1:05:06 MAIN GTEAM ISOLATION VALVE (MSIV) #2 CLOSES 1:05:37 NGIV #1 CLOSES 1:40:00 LOW FW FLOW ALARM 1:41:00 SFRCS SG LOW LEVEL TRIP. CHANNEL 1 (SEE 1:41:04:345) 1: 41:04:045 SFRCG FULL TRIP (SAME AS 1:41:00) 1: 41:00 MANUAL SFRCS TR!P LOW STEAM PREGSURE, BOTH CHANNELS 1:41:10 AFW TO SO ISCLATION VALVES START TO CLOSE 1:41:10 GFRCS 50 LOW LEVEL TRIP, CHANNEL 2 1:41:01 AUX!LIARY FW (AFW) PUMP TURDINE #1 DVERSFEED TRIP 1: 41:44
~AFW PUMP TURDINE #2 OVERGPEED TRIP 1:4:300 MANUAL GFRCG TRIP, LOW STEAM PRESGURE. RESET 1:45:50 AFW PUMP TURDINE #2 OVERSFEED TRIP RCGET 1: 46:00
- 1 AFW PUMP GTARTG 1:47: 40 AFW TO #2 00 ISOLAT!ON VALVE OPCN 1:40:49 PORV CTCN (04;;.0 PS! ACTUAL, 04 5 PS! SCTPOINT) 1:40:50 PORV CLOGED (0076.7 PS! ACTUAL. 2075 FS! GETPOINT) 1:49:00 AFW 70 #1 CO !GOLATION VALVC OPEN 1:50:09 PORV 0 FEN (04:4.1 PG! ACTUAL) 1:50:10 PORV CLOGED (2769.4 PS! ACTUAL) 1:51:10 PORV OPEN (04:5.0 PG! ACTUAL) 1:51:01
- 1 GO LEVEL DROPG DELOW 0" d
1:51 00 GTARTUP FW FUMP ON TO FEED #1 00 FROM DEARATOR 1: 51: 40 FORV ISOLAT!ON VALVE CLOGED DY OPERATOR AT 0141.0 PS!
1:51: 4;
- 50 LCVEL STOFG DROPP!NO AT 9.0" 1:51: 44
- 1 00 LEVEL GTOF3 DROFP!NG AT 7.0" 1:51:47 PORV CLOSED (2110.9 PG! ACTUAL) 1:51:54
- 1 CO PRCGGURC GTOPG DROPP!NO AT 749.6 PG!
1:51:57
- 1 GO LCVEL GTARTG INCREAGING 1:52:00
- 2 GO F6ECCURC STOP3 060PP!NO AT 910.0 PGI 1:50 06
- 2 00 LEVEL GTARTG !NCAEAGING 1850s:1
- 2 AFW FUMP PUMP GTARTG 1:52:25
- 1 00 LEVEL RA!CED ADOVE 0" 1:50:20 MAX! MUM INCORE TCMFCRTURE REACHED, 601.5 F 1:53:05 AFW FLOW GTARTG TO #2 00 1:50:01 MAX! MUM Tavo REACHED, 592.5 F 1:50:05 MAX! MUM Th RCACHED, 595.5 F t
u.--
f.~
s
.e g
i..
1:53:56 PORV ISOLATION VALVE OPENED BY OPERATOR is54:03 AFW FLOW STARTS TO #1 SG 1:58:21 HPI PUMP M1 ON.
1:58:00 LPI PUMP #1 ON 1:58:37 HPI FLOW BEGINS 1:58: 40
- 1 AFW PUMP SUCTION TRANSFERS TO SERVICE WATER 1:59: 06 HPI FLOW STOPS 0:00:07
\\
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4 I
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e
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h Maia feed "1
Main feed imlation valv) contril valve FW 612
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PDS 2686 A D g gg.,pa, g
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Auxiliary AF 3869 e
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o
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AF 3872 f
AF 599 W-Main feed control valve PDS 26 55 A D LSLL-SP FV SP 6A OTSG 9A69A9 j
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g Main Feedwater Main Feed Isolation Valve Tra nsmitt...
FV SP 7A Startup Control Valve
~.,
's 3689A heYt 8
PV ICS 11B 3689L Main Steam laolation 3687G ~
NRV Valve MS 101 3687H Drain to 3689E A
M M
S 106 Condenser 3689F Li MS 394 OTSG 3689M ~
11 3680N 1$11 f,",j' Auxiliary 3687C {
Governor um 11 3687E f
MS 107A M
Auxiliary I
d Governor 4e"f-g1 Q Ctospherie ump 12 l
yPVICS pg MS 107 IIA 3689C E'I O
3689h Main Steam Isolation 3687A d -NR g Valva 115 100 3687B 7
m 3687K l Drain to OTSG 3687L
.f k
ndengn g gq 12 3689C 4
Bypass 3689C 8
MS 1001 3
f 3
=
. 3 3 6...
1 Figure 41, SFRCS Components 4 100
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