ML20009G566
| ML20009G566 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 07/24/1981 |
| From: | Mckelvey T DETROIT EDISON CO. |
| To: | |
| Shared Package | |
| ML20009G560 | List: |
| References | |
| NUDOCS 8108040430 | |
| Download: ML20009G566 (25) | |
Text
192 1
(Slide.)
2 This is one division of RHR complex.
3 3R. KERR Other questions?
4 (No response.)
i 5
Thank you, sir.
6 Nr. McKelvey.
7 ER. McKELVEY:
3y name is Terry McKelvey.
I an 8 the principal electrical engineer involved in the design of 9 Fermi 2.
And I as going to present to you the reliability l
10 of our station power, including the effects of the loss of 11 various stages of AC and DC, and get into the discussion on 12 station blackout.
13 In order to do that, I would like to give ycu a 14 f eeling f or the diversity of our offsite power source.
15 (Slide.)
j 16 Also for its independence and how we derive it 17 f rom our electrical transmission system.
First of all, the 18 offsite power source at Fermi 2 is made up of five separate t
l 19 transmission lines, two from our 345-kV system and three 20 separate lines on the 120-kV.
21 As you can see here, the 120-kV lines are from 22 three separate s' lions on our system.
1 l
23 HR. CARBON:
Could you step back and use the 24 poin ter, please.
25 BR. EcKELVEY:
DXay.
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originato 120-kV lines the three As you can see, 20-kV transmission separate locations in our 1 1
to lines coming 2 at three The 345-kV lines, transmissionBrownstown 3 syste.
4 Fermi 2, are both from our is treated as if it was t wo It station.
i ch areas is a split They come into two separate sw t 5 actually 6 separate stations.
Fermi 1 7 located on the Fermi site.120-kV switchyard was for the The existing ximately 14 has been in existence f or appro ission of 8
switchyard is for the transm It 9 plant.
The 345-kV to years.
2 11 power of f site f rom Unitcan see here, we have a ti Consumers It is It has the Whitinc power plant, As you 12 we In addition, 13 Power in the area.
the Fermi site.
from We 14 approximately 20 miles in nine different locations.
15 are tied to Consumers PowerHydro and Toledo Edison.
The 16 are also tied to Ontario facilities is 7300 to neighboring i
17 combined total of our t es ther 18 megawatts capacity.
other locations are from o Those HR. RAY 19 ints 20 points on the Yes, there are nine separate po system?
two separate MR. McKELVEY:
For example, 21 we tie to Consumers.
to separate transmission lines where 22 there 23 Ontario Hydro and three pools at 24 Toledo Edison.
Are any of these ties to other HR. R AY 4 25 C
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BR. EcKE1VEY:
Yes, they are.
The ties to Toledo 3 Edison are at 345, and also to Ontario Hydro.
4 HR. CARBON:
How widely separated are the five 5 lines coming into the plant?
6 NR. McKELVEY:
Okay.
There is a common 7 transmission corridor into Fermi 2 f or approximately five 8 miles.
That is as shown here (Indicating).
The line -- the 9 corridor is 500 feet vide.
It has been designe' is take the 10 torst failure of any structure falling over that would leave 11 enough lines -- all we need out of these five lines is one 12 separate line existing to power adequate ESF at Fermi 2.
I 13 So we have designed the spacing of the 14 transmission lines on this common corridor to accommodate l
15 the f alling over of a 345-kV tower.
16 HR. CARBON:
Each of the lines has its own --
17 ER. EcKELYEY:
Support of tower, right.
18 ER. RAY:
When you say they are designed -- the 19 f alling tower will not impact an adjacent line?
l 20 HR. McKE1VEY:
There are five separate lines.
The 21345-kV towers are on the outside of the 500-foot righ t of 22 v a y.
In the center are the three 120kV lines.
Obviously, 1
23 the largest structure is the 345-kV tower and if one of 24 those lines fell over across the other transmission lines we 25 would still have adequate transmission lines available to e
ALDERSON REPORTING CCMPANY,INC.
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195 1 shut the plant down.
2 MR. RAY:
You have not answered the question, but 3 you have given se an implied answer.
I gather from what you 4 say that if the EHF line went down it would take down one of 5 the 120-kV lines, is that what you are saying?
6 HR. McKELVEY:
Yes, it would.
7 HR. RAYS So you would have three left.
8 NR - EcKELVEY :
It might take a couple lines down.
9 Re would have at least onv transmission line a vailable to 10 the site.
11 HR. RAT:
All five lines are on the same right of 12 vay ?
13 ER. McKELYEY:
that is right.
14 MR. RAY:
The two large ones are on the outside.
15 So between the two large ones there are three o thers.
16 HR. McKELVEYs Eight.
l 17 HR. RAYa Are you saying, then, that if one of the 18 345-kV lines f ailed it vould take out three 12-kV lines with l
19 it?
It would take out three 120's?
So a falling tower on 20 the high line could leave you with one line.
21 MR. McKELVET:
That is right, in the worst 22 scenario.
23 HR. RAY:
Is the system stable under these 24 conditions?
25 MH. EcXELYEY:
Yes.
The system has been analyzed ALDERSON REPORTING COMPANY,INC, 400 VIRGINIA AVE., S.W-. WASHINGTON D C. 20024 (202) 554 2345
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196 1 with load flow and system stability programs for that kind 2 of contingency.
3 MR. RAY:
Using four lines you maintain stability 4 of the system, it does not break up on you and thereby deny 5 AC power to the system?
6 ER. EcKELVEY:
That is right.
7 ER. RAYS What kind of faults were assumed for 8 tha t stability study?
Can you tell me how comprehensive it 9 was?
10
- 53. McKELVEY:
I did not take part in that 11 stability study.
I am afraid I cannot.
I can get the 12 inf ormation for you.
13 ER. RAYa The implications here are if you take 14 out -- if there are four lines, one failure, they are all 15 poly-phase, th ree-phase f aults.
16 HR. McKELVEY:
They are all three-phase faults, 17 y e s.
l 18 ER. COLBERT:
Characteristically, all of our 19 studies take into account all kinds of f aults, that is 20 three-phased f aults, double phase to ground and single-phase l
21 f aults.
And we would take into account the various loss,of l
22 generators under certain conditions with a reduced 23 transmission system, and then see if the system remains l
24 stable and if the gene.rators go out of step.
,j 25 HR. KEBas Thank you.
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Er. Carbon?
2 HR. CARBON:
Will a typical Midwestern tornado 3 take down one of those power lines or all of them?
Will it 4 knock down some transmission lines like that?
5 HR. McKELVEY:
In the common corridor?
6 MR. CARBON:
There or anyplace, is the power line 7 susceptible to being knocked down by a typical Midwest 8 tornado.
9 HR. McKELVEY:
Yes.
to ER. RAY:
It has happened.
11 ER. McKELVEY However, I have one statistic.
In 12 the last ten years on the Detroit Edison system we have only 13 lost two towers, two 3u5-kV towers to tornadoes.
14 HR. RAYS I notice in some of the background on 15 your station -- I cannot say now where I picked it up, but is on the Fermi site you have a 165 oil-fired unit and four 17 sas11 peaking units.
Are these connected into the 120-kV 18 system at that substation?
19 ER. McKELVEY :
Yes.
We vill be gettinc into that 20 if I can continue.
21 ER. CARBON:
One more question.
The supports for 22 those transmission lines, are they designed to resist an SSE 23 earthquake?
/
24 ER. McKELVEY:
No, they are no t.
25 HR. KERR:
Please continue.
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ER. McKELVEY:
The two switchyards at Fermi 2 --
2 and this is a very brief description of them.
The 120-kV 3 switchyard is located at the Fermi 1 plant.
4 (Slide.)
5 It has three separate lines coming from the three 6 separate stations.
Two of the lines feed bus 102, with a 7 tie to our bus 101.
The Fermi 2 auxiliary electrical system 8 off site power feed is developed from that bus 102.
9 In the 345-kV switchyard we have two separate 10 lines, as I said bef ore, from our Brownstown station in a l
11 breaker and I half scheme.
We also have the Fermi 2 12 generttor, which generator voltage is transformed to the 345 13 transmission network.
And also we have a tap off of bus 301 14 which feeds another system service transformer for the 15 second source of of f site power.
16 I wanted to make a note that we do not use the 17 unit ' auxiliary transformers to elimina te the switching.
18 ER. RAYS Is that bottom feed to the right that 19 goes downward -- I cannot read it.
The 120-kV, is that the 20 point of connection of these other units that are on the 21 Fermi site?
a[
22 BR. McKE1VEY:
Right.
The next slide vill shov 23 th a t.
Note that this is bus 102.
24 (Slide.)
25 The units in question, bus 102 and feed cnto the j
l ALDERSoN REPORTING COMPANY,INC, 400 VIRGIN!A AVE S W WASHINGTON. D.C. 20024 (202) 554 2345
199 1 onsite power system, goes through a transforma tion down to 2 an intermediate vcitage where the peakers -- this symbolizes 3 two peakers -- are tied into the system, two other peakers 4 on a second wing.
Those are for peaking duty.
That voltage 5 is again transf ormed through a system service transformer 6 into our plant, into our ESF buses.
7 The two switchyards, I did not mention before, are 8 located approximately a quarte'r mile apart, so they are very 9 independent.
The control power, the battery power, is also 10 derived from separate battery stations.
11 The auxiliary electrical system is divided into 12 two divisions.
Again, one di. vision is completely normal.
13 Off site power is f ed f rom -- ultimately from the 345 and 14 transformed down to two 4160-volt buses.
Inside each 15 division, each bus is backed by an emergency diesel 16 generator at 4160 volts.
17 There are also associated u80-volt buses inside 18 each division.
They are divided up into load groups 19 associated with each emergency diesel.
We have 20 intra-divisional ties between the u80-volt buses.
Should 21 either a bus or emergency diesel, for example, fail in an 22 emergency situation, we could power one of a kind loads from 23 eithe r load group from the remaining diesel inside a I
24 division.
25 Similarly, for the division one power the citimate J
ALDERSoN REPORTING COMPANY. INC.
400 VIRGINTA AVE. S.W., W ASHINGToN. D.C. 20024 (202) 554 2345 c.
200 1 power sourre is the 120-kV system.
Again there are two 2 buses inside the division, backed by esergency transmissions 3 for transmission at lower voltages.
Again, any one of a 4 kind type load could be powered from either remaining of the 5 load groups.
6 HR. RAY:
Where is the 165 megawatt oil-fired unit 7 connected?
8 HR. McKELVEY:
It was tied to the other bus, bus 9 101 in my previous slide.
10 HR. RAY:
I see it.
I am sorry, I missed it.
11 Yes, thank you.
12 (Slide.)
13 ER. McKELTEY:
Getting into --
14 ER. COLBERT:
I think that should be pointed out 15 tha t that is an oil-fired peaker.
It is an economy 16 reserve.
It is not normally running.
It has to be started 17 u p, and it can be started up in a relatively short time, 18 half-start, meaning on the order of hours.
That is, it 19 would be on the order of two to three hours to start it up.
20 HR. RAYa If you lost all other AC power off the 21 site, could you live while you were starting this unit up?
22 HR. COLBERT:
Could you repeat that?
23 HR. RAY:
If you lost all other transmission into 24 the site and you had -
" nc r.9r diesels did not respond and 25 there was an AC blac/c :::,. ac'.d you start up this -- could
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1 you survive while you started up this fossil unit?
2 ER. COLBERTs The term " survive," yes, we can 3 bla ck start that power plant.
It is equipped with diesel 4 engines to start with its own battery.
By the way, that is 5 not a suall unit.
That is 60 megawatts power.
6 MR. McKELV EY :
You are sor.t of stealing my 7 thunder.
8 ER. RAYS I was talking about the one big unit 9 first.
10 ER. COLBERTs At the present acaent that is an 11 economy reserve and I was mistaken when I said it could be 12 started in two to three hours.
That would be if we were 13 operational.
But right now th a t plant is not manned.
We 14 have to make a conscious decision to send the peuple down 15 there to man that p.'.a n t '.
16 HR. RAY:
So you have your eye on --
17 ER. COLBERT:
That is correct.
18 HR. RAY.
How fast can they start?
19 HR. McKELVEY:
Ten minutes.
20 ER. BAY:
Are they gas turbines?
21 ER. McKELVEY:
Yes.
22 ER. BAY:
Good.
23 Excuse me.
One last question.
Somebody said 60 24 accavatts.
Are there four 60's?
25 ER. EcKELVEY:
480 megawatt units.
ALDER $oN REPOR9NG COMPANY,INC.
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1 ER. RAY:
What do you need to start the plant 2 to shut down the plant safely?
Do you have any idea?
3 MR. McKELVEI Yes.
All ve need is one division 4 power.
5 ER. BAI How many secavatts is that?
6 BB. McKELVEY:
That is approxiaately five 7 segawatts.
So we are well within the rating of one.
8 HR. ZUDANS:
Onit one of those four is a black 9 sta rt..
10 ER. LUSIS:
A small addition.
If we start one 11 Unit we can pick up the other three.
12 MB. McKELVEY:
But there is real.y no need to do 13 tha t.
14 EE. KEBB:
Please continue, Mr. McKelvey.
15 HB. McKELVEY:
Getting into a failure analysis, 16 for long-ters cooling we need one of our two divisions to 17 rem ain intact power supply-wise, and the loss of either 18 division, a s you ca n see, will be backed up by the second 19 division.
Loss of either division vill result in the loss 20 of that division's emergency core cooli:g.
21 (Slide.)
22 Loss of division one vill also result in the loss 23 of all power to the inboard isolation valves.
However, in 24 both cases we have divisional -- division two redundant 25 equipment which can act to mitigate the accident.
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Incidentally, the ECCS is share ray pump one HHR pump and one core sp 1
For example, d its associated 2 buses.
each of the four buses an with that 3 are f ed froT u80 volt bus associated 4 valves are f ed from the xiliaries are on The energency diesel generator au 5 load group.
power They are also fed from that 6
I own load gro'up.
I 7 their Okay.
8 train.
(Slide.)
into the DC system.
rush you 9
Now, moving I do not want to 10 M r. M cK elv ey,
s and my HR. KEREs allocation shows 20 minute 11 want 12 very much, but your time So we of that.
l eady spent most 13 vstch shows you have a rlk a little faster.
14 the information, but ta Will do.
HR. McKELVET :
of fiva batteries.
The Fermi DC system consists graded at 15 260 l
16 Three are at ign.
17 They are of similar des All five batteries are 48 volts.
Three
- one 18 volts, two at ol at the half-voltage.
[
19 center-tapped f or contr ries run non-ESF and the two 48-volt batte 20 260-volt now shows you a ight 21 equipmen t. The overhead I have up here r The batteries are of the two divisions.
22 23 typical for either case design basis worst d on a were 24 sized f or four hours base The battery chargers chargers.
battery 25 event without 1
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i 204 1 sized for being able to carry the continuous load while 2 simultaneously recharging the battery within 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br />.
3 In addition --
4 HR..ZUDANS:
Can I ask a quick -- if you would not 5 have batteries, just a charger by itself, could you use it?
6 RR. McKELVEY:
Definitely.
7 HR. ZUDANS4 How do you maintain the voltages?
8 ER. McKELVEY:
The chargers have their own 9 automa tic voltage regulation.
10 ER. BAY:
I presume you could carry such loads on 11 the chargers indefinitely.
12 BB. McKELVEY:
Yes, as long as the AC system 13 remains intact.
14 NR. BAYS Yes, yes.
15 NR. McKELVEY:
In addition, we have an installed 16 spare ba ttery charger which 1.7 able to be connected to 17 either side of the battery to replace either of the two 18 normally installed chargers, normally operating chargers.
19 Now, getting into a loss of DC, if we lost the 20 division one 260-volt battery we would lose the function of 21 the RCIC system, we would lose the ability to depressurize 22 using the auto safety relief valves.
We wculd also lose the 23 control to division one ECCS, the division one switch gear 24 and also the energency diesels.
However, the loss of this 25 battery can be covered by the existence of the division two s
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205 1 battery and any AC that is available in the division two 2 side.
3 Similarly, for a loss of the division two battery, 4 ve would lose the function of the HPCI systen, the outboard 5 isolation valves that are DC-powered, the control of 6 division two ECCS, the switch gear and the diesels.
7 Similarly, again, it can be covered by the remaining 8 division one battery and AC sources for the redundant 9 loads.
10
- 58. RAY:
A quickie.
You said should you lose one 11 division DC supply -- maybe I am interpreting this too 12 broadly -- you could back up those loads from the other 13 division.
14 ER. McKELVET :
Right.
15 ER. RAY This says you have ties between the two 16 divisions, 17 ER. McKELVEY:
No, not the same loads.
Redundant 18 loads.
19 HR. RAYa Okay.
So therefore you do not have 20 communication between the two DC systems.
21 HR. McKELVEY:
No, they are fully independent.
22 BB. RAY:
Thank you.
23 HR. ZUDANS:
If you lose division numbe:; one, you 24 lose RCIC and that is not recoverable by any redundant 25 n e a ns.
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1 HR. McKELVEY:
The HPSI system along with the ADS 2 --
3 ER. ZUDANS:
But not the RCIC.
If you loss the 4 other division, you lose division two and you have RCIC.
5 ER. McKELVEY:
Right, right.
6 NR. ZUDANS:
Okay.
One is ECCS and the other is 7 not.
8 HE. KERRa Any time Mr. Zudans hesitates, you 9 start talking.
10 (Laughter.)
11 ER. McKELVEY:
I guess, moving to the last of the 12 station blackout, we feel that there is no single equipnent 13 f ailure on our site that can get us into a loss of both
' 14 off site power sources.
Beyond that, we do not believe it is 15 credible to lose both offsite power sources and also to simultaneously lose four emergency diesel generators.
17 However, if such a highly unlikely event were 18 posed, we could through the use of the black start peaker l
19 which was previously mentioned power one entire division.
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20 It is easily sized, as we sentioned before, to do so.
21 That was the conclusion of my presentation, unless 22 you have some other questions.
23 ER. KERE Are there other questions?
24 (No response.)
25 Mr. McKelvey, can you tell me if you have ALDERSoN REPORT;NG COMPANY. INC, tCO VIRGINIA AVE. S.W WASHINGTOd. O C. 20024 (202) 554 2345 p-
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207 1 calculated what is the probability that you will be without 2 off site power f or two hours?
3 HR. McKELVEY:
Our system planning departnent has 4 done such a calculation.
However, it does not take into 5 account all potential offsj te power losses, such as a 6 tornado.
It does take into account storm-related onec. fee, 7 wind.
8 HR. CARBON:
Sabotage?
9 ER. McKELVEY:
Sabotage was not included, either.
-5 10 But we came up with a 10
-5 11 HR. CARBON:
This is 10 fer the life of the 12 plant or per year?
13 HR. McKELVEYa Per year.
14 ER. KERRa You did not take into account 15 tornadoes?
16 HR. McK*LVEY:
We did not.
17 HR. KERRa Is tha t because you did not know how or 18 you did not think a tornado was likely to occur?
19 HR. McKELVEY:
We did not exactly know how.
We 20 are working on that, by the way, and plan to revise it.
21 ER. KERR:
If you cannot do anything else, you 22 vill have to gin up a tornado.
23 HR. McKELVEY :
Right.
There are contingencies, b y 24 the way, for replacing poles in a rapid as possible 25 situation to restore one line to the site should a tornado ALDERSoN REPORTING COMPANY. INC.
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HR. KERR The 10 does take into account ice, 3 I assume?
4 H3. McKELVEY:
Yes.
5 HR. KERR4 Any other questions?
Er. Carbon?
6 HR. CARBON:
Is it impractical to design tower 7 power lines against tornadoes or does it become just 8
ER. McKELVEY:
To the best of my knowledge, it.is 9 darn near impossible.
10 ER. CARBON:
Okay.
11 HR. KERRs Max, there is a slight variation of 12 that which no utility in its right mind would mention, but I 13 vill men tion, and that is you put them on the ground.
But 14 --
t 15 (Laughter.)
16 HR. ZUDANSs And saying everything is possible 17 I have a question, a basic question.
Why are the 18 RCIC and the HPSI systems classified differently?
l 19 HR. McKELVEYa Classified diff erently ?
l 20 HR. ZUDAWS In terms of safety grade.
21 ER. KERRa Er. Colbert.
22 HR. COLBERT:
Bill Colbert, technical director.
23 The RPSI is classified as class 1.
It is class 1 24 backup, and the other division is actually the automatic 25 ADS.
Th e R-C-I-C is -- let 's see, it is the reactor core ALDERSON REPORTING COMPANY,INC, 400 VI AGlNIA AVE S.W., WASHINO JN. O C. 20024 (202) 554 2345 m - -
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209 1 isolation cooling, and it was not designed originally to 2 recover from an emergency, an accident, but an operating 3 emergency.
Why, way back 20 years ago, 10 years ago, that 4 decision was made, I do not know.
But the class 1-ness of 5 the other division is the ADS valves.
So you operate the 6 ADS valves and you go back to your --
7 MR. ZUDANS:
You lose one of your electric 8 systems, you lose a HPSI with it, and you have no way of 9 having high pressure injection.
You have to depressurize.
10 Tha t is the normal procedure.
11 MR. COLBERTs You said if you lose HPSI.
That is 12 not true.
You do have RCIC.
13 ER. ZUDANS:
No, I think RCIC is not in the same 14 category.
It does not have to be there.
It does not have 15 to survive.
In othe r words, it is a lower quality type of 16 device and therefore in the case of some postulated 17 situation it does not have to be there.
It cannot be 18 counted as a backup in your ECCS calculation.
19 ER. COLBERT:
Tha t is correct.
20 HR. ZUDANS:
Therefore it is not there.
21 ER. KERR4 But in real life it is there.
ER. ZUDANS:
That is right.
22 23 Nov -- and it is a very nice thing to have.
I am 24 vondering, what is the philosophy?
Actually, not the 25 utility, th( NRC should tell us why they do not put this in ALDERSON REPORTING COMPANY,INC.
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2 HR. KERR4 Tomorrow morning at 8:00 o' clock.
3 (Laughter.)
4 HR. KERRs Okay.
Any other questions of Mr.
5 EcKelvey?
6 (No response.)
7 Thank you, sir.
8 HR. LEHNERT:
My name is Dan Lehnert, system 9 engineer, Detroit Edison.
And the topic is the Mark I 10 containment issue.
And what I would like to do is briefly 11 describe the nature of the containment, primary containment 12 design at F ermi 2, the plant-unique program for resolving 13 the Mark I containment issue, and identif y f or you the 14 results of our implementation efforts.
15 (Slide.)
16 The primary containmen t at Fermi 2 is a steel 17 sha ped structure designated by GE to be a Mark I 18 con tainment.
This slide shows the primary containt.ent in an 19 elevated sectional diagram.
As you see here, it being the 20 drivell, it is an inverted lightbulb shape connected to a 21 torus-shaped vetvell or supprescion pool, and it is 22 interconnected with the drivell in the " suppression pool l
23 between th e vent line, vent header, and the downconers.
s, 24 The original design -- the primary containment was 25 designed, erected f or the ASME section 3 during the early 1
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