ML20011A185
| ML20011A185 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 09/30/1981 |
| From: | NRC COMMISSION (OCM) |
| To: | |
| References | |
| REF-10CFR9.7 NUDOCS 8110080171 | |
| Download: ML20011A185 (46) | |
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PUBLIC MEETING BRI.EFI.NG ON...DIABLO CANYON - INCORRECT
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EISMIC. ANALYSIS h
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1 UNITED STATES OF AMERICA 2
NUCLEAR REGULATORY COMMISSION 3
4 Public Meeting
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E BRIEFING ON DIABLO CANYON - INCORRECT SFISMIC ANALYSIS 6
7 8
Room 1167, 9
1717 H Street, Northwest, 10 Washington, D.C.
11 Wednesday, 30 September 1980.
12 13 The meeting of the Commissioners was convened, f
14 pursuant to a vote to hold a short-notice meeting, at 11:05 15 a. m.
16 BEFORE 17 NUNZIO PALLADING, Chairman 18-PETER BRADFOP.D, Commissioner 19 VICIOR OILINSKY, Commissioner 20 JOHN AHEARNE, Commissioner 21 THOMAS ROBERTS, Conmissioner 22 ALSO PRESENT:
f 23 Messrs. Chilk, Bickwit, Jordan, Eisenhut, Cornell, 24 Den ton, Knight, and Scroggins.
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3 CHAIRMAN PALLADINO:
The topic of this morning's 4 meeting is a briefing on a potential problem in the analysis 5 of piping systeas contained in the annulus area of the 6 containment building for Diablo Canyon Unit 1.
We were 7 notified of this problem on September 28 by Pacific Gas E 8 Electric.
The problem was uncovered as part of a design 9 reyiew, _and it is our understanding that f uel. l.oading vill.
10 be delayed while the problem is being reviewed.
11 Before we go en with the meeting, since this is a 12 short-no tire meeting, we vill need the concurrence of the 13 Commission to proceed on that basis.
Do we have a 14 concurrence?
15 COMMISSIONER RCBERTS:
Aye.
16 COMMISSIONER BRADFORDs Aye.
17 COMMISSIGNER AHEARNEs Aye.
18 COMMISSIONER GILINSKY:
Aye.
19 CHAIP. MAN PALLADINC:
Aye.
20 I gather it is unanimous.
Before I turn the 21 mee ting over to the Staff for the briefing, General Counsel 22 has some comments he would like to make.
23 MR. BICKWIT4 Thank you.
24 I am advised that this discussion could in some.
25 way touch on contested issues before Eoards and before the ALCERSCN REPcRTING COMPANY. INC, 400 VIRGINIA AVE., S.W., WASHINGTON. O.C. 20024 (202) 554 2345
3 1 Commistion.
- 4 hat we have done in the past in this 2 proceeding is, where we felt that there was a rationale for 3 discussions with the Staff in any event -- and we do in this 4 case, and I will get into that later -- we have advised that 5 the other parties would have an opportunity to comment on 6 anything that was said with respect to those: contested 7 issues.
8 The reason we think, in spite of touching on these 9 contested issues that there is no problem with the ex parte 10 constraints of the Commission, is that the Commission is 11 antitled co near from the Staff on matters involving the 12 supervision of its licensees.
In this case, there is a 13 license that is ef fective and it seems entirely appropriate 14 for the Staf f to communicate with the Commission with 15 respect to its supervisory function regarding that 16 licensee.
17 In fact, it would our view that these 18 communications could take place in private.
Our advise 19 would be, howaver, that we proceed as we have in the past on 20 this matter; and that the communications take place in 21 public as they are doing in this meeting; and that the other 22 par ties be given a week to cocnent on any contested issues 23 t ha t may be touched upon by the Staff'c presentation.
24 CHAIRMAN PALLADINO:
All right.
Thank you.
25 Let's see.
Who is going to give the ALOERSON REPcATING COMP ANY,INC, 400 VIRGINI A AVE., S.W., W ASHINGTCN. 0.C. 20024 (202) 554 2345
.0-1 presenta tion ?
2 FR. DENTON:
Darrell Eisenhut and Ed Jordan will 3 give the briefing.
4 -
MR. JORDAN:
Okay, Mr. Chairman, you already 5 identified a part of the presentation I have regarding 6 notification.
The NRC actually became aware on Sunday, 7 September 27th, when the plant superintendent called the 8 Resident Inspector and advised him Eha t there was a question
- - 9 of the seismic analysis that may affect f uel : loading, ahd.
10 that they were looking into it.
-11 COMMISSIONER GILINSKY:
I think some people are 12 having trouble hearing you back th e re.
13 MR. JORDAN:
The notification was made informally 14 to the Resident Inspector on Sunday, September 27th, by the 15 Plant Superintendent.
The notification was that there may 16 be a problem with the seismic analysis that would affect 17 Unit 1, and so the Licensee was not going to go ahead with
-18 f uel loading at that time and they would notify us further.
19 On Monday, the 29th, the Licensee reported 20 formally that incorrect values had been used for the 21 vertical component of the seismic response spectra for Unit 22 1, and that fuel loading would not be initie.ted until it was 23 resolved, a nd that the NRC concurred.
There is a written 24 report to tha t ef f ect.
25 "he error was stated to be affecting equipment ALCER$oN REPORTINo CCMPANY,INC.
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1 that is in the annulus between the crane wall -- this is an 2 intervall, and I will show you a figure in a moment -- and 3 the outer containment wall on two elevations.
4 The error var discovered by an engineer who was 5 exasining Bulletin 79-14 actions on Unit 2.
Je. understand l
6 from the utility.that this was identified asra question on 7 Frida), the 25th, and identified to raanagement.
There was a 4
8 management engineering review that was done on Saturday, and
,9 then on Sunday --
10 COMMISSICNER GILINSKY:
Could you tell us what 11 79-1u covered?
12 MR. JCRDAN.
Certainly.
The Bulletin 79-14 was a 13 bulletin.to review the as-built configuration of pipinc in 14 the reactor f acilities to compare the actual configuration 15 vith the analysis that was done for the seismic.
That 16 bulletin has been applied to all operating plants, and it is 17 continuing to be applied fo r pl ant's tha t are under 18 construction.
19 COMMISSIONER BEADFORD:
Did that come out of the 20 five-plant shutdown in '79?
Or was that e7 ether matter?
21 MR. JORDANS It was a part of the series of 22 seismic reviews.
'Je also had a Lulletin on anchor bolts and 23 base pla tes, and this particula r bulletin on as-built grew 24 directly out of the findings fron the as-built-- or I'm 25 sorry, from the anchor bolt / base plate bulletin.
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1 Ihe Licensee established on Sunday that this was a 2 nonconservative errcr.
Their Plant Review Committee was 3 reviewin; the plant status for fuel load, the Uni. 1 plant 4 status f or f uel load, and they made the determination not to 5 proceed until it was resolved.
' ~
6 I will attempt to explain the error.
The response 7 spectra are taken for segnents f rom a diagram in a 8 consultant's report.
What actually! hsppened was that the
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9' identification of the segments was inadvertently. exchange'd 10 f o r the two units.
11 Could I have tne first slide, please?
12 (Slide.)
13 MR. JORDAN:
The unit arrangements for the two 14 containments are essentially mirror images because of the 15 common auxiliary building between the two containment 16 buildings.
So that if you simply mirror-flipped the 17 aquipmen t in one rontainment, it would matrh very closely 18 the equipment in the other containment.
19 The vertical response spec tra in a given segment 20 of this annulus is dependent upon the massive cc.eponents and 21 equipment that-is in tha', particular sector, and 22 predominantly that mass is the fan roolers which are located 23 ' abo ve the eleva tions, at least the two elevations that were 24 af f ected.
25 Cotild I have the second slide, please?
AI.CERSON REPCRTif,G COMPANY,INC.
400 VIRGINIA AVE, S.W., WASHINGTON. D.C. 20024 (202) 554 2245
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2 MR. JORDANS let r.e see slide three.
3 (Slide.)
4
- !R. JORDAN 4 Ckay, the f an coolers are the dark 5 objects, the five f an coolers in the annulus.
This is the 6 Unit 1 view.
The annulus region -- maybe it would be better this (indicating) is the annulus 7 if I pointed to it 8 region.
The crane vall and the outer containment vall 9 (indicating), and the fan coolers are located here.
10 (indica ting).
11 Now could I have the slide two?
12 (Slide.)
13 MR. EISENHUT I guess you should note also that 14 this is perf ectly symetrical.
So the crane vall literally 15 goes essentially f ron the base slab tC the higher elevations 16 in the plant, so there is actually an annulus that goes 17 completely around the containment, and what we vill be 18 talking about here is the structures in that annulus and 19 their vertical height.
20 OHAIRMAN PALLADINO:
Are these f an coolers located 21 in a mirror image on the other plant?
22 X3. JORDAN:
That is correct; precisely true.
23 The only reason for showing this diagram is this 24 is the dia;ran from the nosgri Report which shows the frame 25 numbers and the angles.
This is is the upper lefthand ALCERSON REPORTING CCMPANY,INC.
40C Y!RGINi A AVE., S.W., WASMNGTON, O C. 20024 (202) 554 2345
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.e I corner of the drawing and are supposed to correspond with 2 the locations of the f an coolers en Unit 1.
3 This is for Unit 1.
The label ir obscured at the 4 bottom, but the object is that those lines then precisely 5 correspond to the location of the f an coolers.
6-Now could I have slide 7
JR. EISENHUTa If I could interrupt for a second?
8 You see the little diagram at the top.
This is just simply
.9 a mathematical model.
The inside of the crane va11 is 10 modeled as a point on here, and this is actus11y just a 11 modeling, a mathematical model of the outer annulus.
It is 12 broken into five sectors, so to speak, corresponding to five
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13 steel - f rames.
These are actual structural, interior a
14 structures in this area that actually support the piping.
15 5o don 't be mislead by the little diagram at the top; it is 16 actually just a configuration.
It is modeling into 17 nonsymetriral, nonuniform sort of mass areas in the annulus,
'E 18 and that is what the little configuration is we're talking 19 about.
20
?.R. JORDAN:
That is good.
So the calculations 21' tha t are done by this modeling are then to provide for the
' 22 piping analyst the forcing function, the spectral components 23 a t those locations; and then at each one of those fra=es, 24 then tite highest value is what is applied to the aquipment 25 within that sector.
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400 VIRGINIA AVE., S.W., WASHINGTON, D.C, 20024 (202) $54 2345
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1 Could I ha"e the third slide with the overlay, 2 then?
3; (Slide.)
4 3R. JORDAN:
This is back to Unit 1.
Then this is 5 the overlay of the figure that was taken f rom the Hosgri 6 Report, which would be north-arrovs' oriented.
You will 1
L 7 note that the frame lines do not coincide with the locations 8 of the f an coolers.
9 (Slide.)
10
%B. JOFDAN If you vill interchange nov the 11 figure for Unit 2, nov the frame lines correspond precisely 12 with the fan coolers.
13 COMMISSICNER GILINSKY:
!s the problem that they 14 did no t take the mirror image of the diagrar?
15 MR. JORDAN:
There was a mirror image 18 transformation so that both units were incorrect.
17 CHAIRMAN PALLADINO:
Both units vere incorrect?
18 MR. JORDAN:
Both units.
19 COMMISSIONER BRADFO?D So they used Unit 1 and 20 Unit 2, as well?
21
$R. JOSDAN:
Yes.
That is.ty understan-ding.
22 There is goin7 to be, then, a 50.55(e) report for Unit 2, as 23 v ell.
24 XP. EISENHUT4 It is certainly a questien tha t is 25 still open, tha t certainly we know that EGCE has inforned us ALCEASON REPCRTING CCMP ANY. INC, 400 VIRGINIA AVE.,3.#, WASHINGTON. D.C. 20024 '.202) 554 2345
10 h a 1 that on Uni t 1 they used the breakdown and the layout for 2 Unit 2.
They have yet to inform us officially v'n+ther or 3 not the Unit 2 was done right, or whether they actually had a reversed then and what they used on Unit 2.
5 MR. JORDAN 4 Right.
Since Unit 2 doesn't have an 6 operating license, the reporting time interval that is 7 allowed is longer.
6 MR. DENTON:
So what they take, then, is for the 9 design of the supports for the equipment sector is the-
~
10 maximum vibration of either of the two adjacent frames.
So 11 they will have to go back and recalculate then with_the 12 right geometry for each one to see if the supports for the 13 equipments are properly designed, and the equipment is 14 properly designed.
15 COMMISSIONER BRADFORD:
I need to have you tell me 16 in the simplest terms you can what the significance of the 17 f rame line is.
18 dR. DENTON:
The " frame" is sort of " structure."
19 The structure was broken up into various frames so that they
- 20 could model the vibration of the reactor structure itself.
21 Then they used that as input to design the supports and 22 equipnent that went into those parts of the reactor 23 cospartm en t.
24 COMMISSIONER BPADFORD:
Okay.
'4 h a t is the f
25 significance of tha t in relation to the fan coolers?
i h
ALCERSoN AEPoAT!NG COMPANY,INC.
400 VIRGINIA AVE., S.W., WASHINGTON, O C. 20024 (202) 554 2345
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1 MR. JORDAN:
The mass of the fan coolers is 2 predominant in those sectors, so that then becomes the 3-strongest forcing function that feeds back into the 4 structure and gives some amplification of the seismic 5 forces.
6 MR. EISENHUT:
When you model it, you choose to 7 model it around the largest mass.
So in this case you have
- 8 modeled it around it, and this is just meant to be a pretty
-9 sim ple description.
We are actually sim plifying it -somewhat -
10 of course, but to show that in fact this is a mirror-image 11 problem and th a t is in fact the way it has been conveyed to 12 us from PGCE; that it has been only for -- and the only 13 evaluation, as Ed mentioned earlier, the only piece that 14 this was done on on PGCE's preliminary assessment is on the 15 vertical acceleration for the equipment located in the 16 ann ulus region.
17 CHAIRMAN PALLADIN0s Only for that?
18 MS. EISENHUT:
Only f or that one calculation.
And 19 they are essentially separable, looking at the horizontal 20 acceleration models and the calculations f or the annulus 21 region and the rest of the plan t.
22 So at this point it is their prelimina:1 belief 23 t ha t it caly af fects the one piece -- that is, the vertical 24 accelerations in the a nulus region for equipment and 25 piping.
ALDERSON REPORTING CCMP ANY. INC.
400 VIRGINtA AVE S.W WASHINGTCN O C. 20024 (202) 554 2345
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COMMISSIONER AHEARNE:
Have they gone back and 2 checked a wider survey to see whether or not 3
XR. EISENHUT:
They obviously must have to give us 4 the preliminary assessment that tha only one it affects fs 5 this.
It is something that 6
COMMISSIONER AREARNE:
Well, there is a difference 7 between a " hope" and a --
tha!'s right.
You need to 8
MR. EISENHUT:
Yes; t
9 apprecia te that it is a little early in the discussion.-
A to lot of this inforsation we got off of a phone conversatien 11 yesterday af ternoon.
12 MR. CENTON:
We certainly intend that they go 13 back.
I don't know how much we can say that they have cone 14 back today.
15
- 33. EISENHUT Today I just don't think we really 16 can.
17 CHAIPMAN PALLADINO:
It seems st ance that you 18 would have this kind of mixup for just one pa r tic ula r 19 accelera tion --
20' COMMISSIONER AHEARNE:
Yes, one.
21 CHAIRUAN PALLADINO:
-- bocause you pro' ably were 22 looking, I'm sorry, the person doing the work was probably 23 looking at the same diagram for the horizontal one.
24
'R.
JORDAN:
But the only affectation here is for 25 tha t vertical component.
Ihe horizontal component is the ALDERSoN REPORTING COMPANY,INC, b
400 VIRGINtA AVE., S.W. WASNNGTCN. O C. 20024(202) "
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So ths that mass doesn 't v
2 affect the horizontal component.
The elevation within the 3 building hss a greater effect on horirontal component.
4 M3. DENrCN:
It sounds to me as though it is 5 potentially -- and I don't want to speculate too f ar -- a 6 potential interf ace problem between the two parties that did 7 this.
I think PGEE itself did some of the calculations, and 8 then John Bloom and Associates did some.
And when the 9 'inf ormation transf erred over that interface perhaps is where 10 it got switched.
11 CHAIRMAN PALLADINO:
Are ve asking the Licensee to 12 go.back anf look st their whole 13 dR. JORDAN Yes, and you will see 14 MR. DENTON:
We will get to that.
15 MR. EISENHUTs Could we hold up on that for one 16 second?
17 COMMISSIONER BRADFORD:
3efore you go on, can you 18 make clear to me what the practical consequences of the 19 mistake -
cn: not in the sense -- in one sense you are only 20 going to know af ter more work has been done ; thst is, 21 whe ther it makes a real difference.
Eut what kind of 22 mistaken conclusion would this sort of misalignment lead you 23 into ?
Would it lead you to misassess the susceptibility of 24 th e reactor itself to --
25 3R. DENTON:
I have urged Darrell not to ALCERSoN REPCRTING CCMPANY. INC.
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400 VIRGINIA AVE S.W., WASHINGTON. O.C. 20024 (202) 554 2345
r 14 Qc 1 specula te, because I don't want to get too far out of cur 2 data base, but since this goes into the design of the 3 support system foe equ1; ment, it would say that the supports 4 to hold down f or example the f an coolers or tc tie devn the 5 f an coolers might have to be changed.
8.
MR. EISENHUT Right. 'And se vill be addressing 9 which equipment we think potentially is affected by this.
10 It does not reflect back into the reactor itself.
11' MF. DENTON:
It is very difficult to speculate 12 W h a t it may do.
13 CHAIRMAN PALLADINO
'4 h a t I think he is trying to 14 ask is:
What kind of result might there be, either the 15 supports or some pipe hangers?
16 MR. DENTON:
There might be mora pips hangers, 17 pipe hsngers at different locations -
18 CHAIEMAN PALLADINO:
Different locations.
19 MR. DENION:
stronger pipe hangers, stronger 2D bol ts, o r --
21 COMMISSIONER BRADFORD:
The only reason I aske:1
'22 a bo ut the reactor is that I gathered, Harold, from your 23 explanation of the f rame that it somehow centered on the 24 eff ect on the reactor.
No?
f 25 MR. JORDAN:
No.
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1 COMMISSIONER 33ADFORD:
Okay.
Forget the reactor,
-1 2 then.
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YR. J3BDAN:
Maybe I can hel; by calling for-h 4 backup slide, which is the' elevation of the building.
5 (Slide.)
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6
!!R. JORD AN s This is the crane wall (i n di r a tir.c ).
7 The crane is actually supported en two walls, which is af,x N
8 annular wall.
This (indicsting) is the outer containment 9 vall.
These (indicating) are the two elevatienr, atd here
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10 (indicsting) are the ones that tre directly affected.
So it 11 is the equipment that is supported on the floor in~this 12 annulus region and is subsequently tied to this (indicating) 13 column that the fan coolers are installed on.
t s
14 So that it should not affect the pedestal, any of 15 the reactor components in this sector as a result of that 16 error.
Does that help to clarify that?
17 COMMISSIONER BRADFOPD4 It does, within its own I
18 ter ms.
19 (Lauchter.)
20 COMMISSIONER 3RADFORD:
It leaves me still 21 somewhst confused sbout the overlay tha t showed the five s
22 f rames which seemed to flow out fcca the reactor.
23 MR. JORDAN:
Okay.
Yes, the five franer vere just 24 geome tric.
They really should have been only segments from 25 this annular region.
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1 l:!R. EISENHUT Ed, it goes back to what ! :::a a n t
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2 beffre ibbut She 1-lhtle diagrs= in the corner.
The sectors g[ - _ _
3 are really sectors in the arnulur,.
From a modeling n'
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4 standpoint, a mathematical cdeling standpoint, you for this
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5 exercise make evetything insice the wall a point.
But it is e
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6 not really a --
7 00'fMIESIpNER BRADFORD:
So it has got nethine to c
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- U 8 do with the repccor --
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MR. EISENHUTs It really has nothing to do with 9
W to the. f act tha t, these sthings con tinue on in.
'w 11 XR. DE!3?ONi ~ There are many important reactor
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12 sys tems, tho,1o h, tdat pass through thir.
13 CDMMISSIONES BRADFORD:
Right.
5 i
.s 14' M Ti,, DEriTON :
It would have pipes and equipment in 15 the re.
So.it deals with the supports for those pipes and
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16 equipme'n;tL lthat penetra te this area.
17 00MMISSIONER BRADFORD:
Yes.
18 COMMISSIONER GIIINSKY:
Could I ask, did the
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. 19 analysis in ef f ect assune that the fan coolers were in
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, kio,dif feren t loca tions than they in f act are?
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21 MR. EISENHUTs That is one way of looking at it; 22 yes.
That is one way of looking at it.
23 MR. JORDAN So that in the sectors that they came 24 u p with the vertical acceleration component, they would have 25 a nonconservative component applied in the design where th e ALCER5CN REPoRTNG COMPANY,INC, 400 V!RGINI A AVE., S.W.WASNNGTON. O.C. 20024 (202) 554 234!,
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1 error was prevalen t.
2 Now in their other areas, they are overdesigned.
3 Where the forcing f unction tha t they picked off of the 4 diagram was incorrect and was greater than is actually 5 correct, then that sector is overdesigned.
The largest 6 segment in fact that is facing the reactor building arpears, 7 from our preliminary information, to be overdesi;ned; that 8 those two are symetric.
9 CCMMISSIONER BR'ADF0ED:
And I gather from what you 10 are saying -- I am referring to something that was not clear 11 to me frca the FN -- and that is, that the error did 12 actually affect the design of the plan t; that it is not just 13 something that hac cone into some af ter-the-f act analysis?
14 ME. EISENHUT:
Well, it may or may not.
The thing 15 tha t you have to remember is a couple of things.
All the 16 piping tnere does have a seismic design.
It.is supported.
17 It has an eristing design that is there in place.
18 COMMISSIONER BRADFOPD:
Eight.
19 MR. EISINHUI:
They now know that there we.s this, 20 on this certain selected pieces of piping area, they are 21 going to haveto back and recalculate.
They may find that a
22 some piping was over-r.estrained.
Tha' is, it's more than 23 enough.
It is more than conservative.
24 COMMISSIGNER 3RADFCFD:
les.
-25 aR. EISE3 HUT:
And they find on others that they ALDERSoN REPORTING COMPANY. INC.
400 VIRGINIA AVE.,3.W WASHINGTON. O.C. 20024 (202) 554 2345
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18 1 have to go -in and either put in more supports or beef up 2 supports.
It is really going to take an analysis of gcinc 3 through one-by-one to derid e what the real net effect is 4 going to be.
It may well turn out, like th+ ether 5 evaluations in the past which turn ont to be very much 6 largely a computer exercise, considerable paper, 7 considerable time, but very little change physically in the 8 plant.
9 TR. DENTON:
It depends on the sensitivity of th e to analysis. to things like the weight of the fan coolers.
11 There is a lot of weight in there which was correctly 12 modeled such as ficor yeight, and so forth.
13 COEMISSIGNEE E3ADF0ED:
Yes.
14 MP. DENTON:
So you just have to rarun the code 15 and use spectrum to analyre the supports.
16 COMMISSIONER ERADFORD:
Yes.
I understand that.
17 My poin t was a little different.
I appreciate that it may 8 turn out at the end of the analysis that everything is still 19 all righ t.
'4 h a t I was not clear on until just now was that
~20 the error had actually taken place at a point in time when 21it was used in the design and construction of what is 22 actually there.
It is not si= ply something that is in an 23 af t er-the-f act analysis.
24 MR. EISENEUT.
That is correct.
It was used in 25 actually designing the supports and calcula cing the stressas ALDETtSoN REPcRTING COMPANY,INC, s
400 VIRGINIA AVE., S.W., WASHINGTON, D.C. 20024 (202) 554-2345
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19 1 f or - example on piping in those regions f ro.a the best 2 information we have right now.
3 CGMMISSIONES GILINSKY:
let me just pursue this 4 for a point and see if I understand what you are saying.
5 The problem, or the potential problem, comes from the fa'ct 6 that we are not dealing with a symetrical reactor.
If there 7 were circular symetry presumably it would not matter if you 8 had shif tei-. the coolers around and analyzed it at some 9 dif ferent Engle.
But it is the lack of symetry in the rest 10 of the problem that causes concern?
11 MR. IISENEUT:
ti e ll, that is the way it exhibits 12 itself certainly; and if it was symetrical and you flip it 13 around an axis of synetry, there is no problem.
14 MR. DENTON:
Maybe we should ask a specialist in 15 mechanical design.
16 MR. KNIGHT:
I think if I --
17 CHAIRMAN PALLADINO:
For the record, would you 18 mind identif ying yourself?
19 MR. KNIGHT:
Yes.
I am Jim Knight from the NRC 20 S ta f f.
21 I think it would perhaps lead us astray to get too I
22 involved in worrying about the lack of symetry as a 23 f undamental aspect of the problem.
In doing such analyses, l
24 af ter you go through your various steps you compile a 25 "ca talog ue," if you will, of ficor response spectra at Ad)ERSoN REPORTING COMPANY. INC.
400 VIRGINIA AVE., S.W.. WASFINGToN. 0.C. 20C24 (202) 554 2345
7 20 0
L.
1 different locations in the building.
This is the motion 2 af ter. it has been filtered through the building, and some 4 frequencies are danped and some are arplified.
4 I have this catalogue now, and fror everything we 5 knot to date the actual development of those floor response
' 6 spectra was done properly.
It appears that when the 7 individual went to-do his a nalyses he selected the wrong 8.rasponse spectra f rom that catalogue of response spectra.
9 He was led astray because of the fact that he had
-10 this dif ficulty with his airror image, and that where he 11 thought frame three wa s in a certain location in r! nit 1 it 12 in f act wasn't.
He was looking at the location of frs:e
-13 three in Unit 2.
14 So as I said, I don't see that --
15 COMMISSIONER AHEARNE:
Are you saying, Jim, that 16 they actually calrulated the response spectra correctly; but 17 the y then used the wrong --
18 MR. KNIGHT:
They used the wrong response spectra ;
19 y es.
Everything we know to date leads to that.
It is an
~ 20 error,.if you will, that seems so far down in the chain of 21 concerns, so to speak, that it seems miniscule, hut tha t is 22 apparently what happened.
23 MR. JORDAN:
Could I have slide six, please?
24 (Slide.')
-25
- 23. JORDAN:
'Je have described the region of ALDERSON REPORTING COMPANY,INC.
400 VIRGINIA AVE., S.W., WASHINGTCN. D.C. 20024 (202) 554 2345 k-e.
e
n-21
. TA i
1 concern.
I want to focuse aust vary triefly on the 2 equipment that we understand goes through those sectors.
3 There is same large-diameter and small-diameter piping, 4_a ux ilia ry syst em pipin g, and it is that piping that ir 5 supported on those two ficors that is in question at this t-6 point.
7 Could I have slide seven?
8 (Slide.)
9 ER. JORDAN:
This is a cursory equipment list 10 which indicates the kinds of equipment that we believe would 11 be involved within those sectors.
12 COMMISSICNER ESADFCFD:
You are not sure of this 13 y e t, Ed?
I notice you say "potentially involved."
14 ME. JORDAN 4 We know tha t the equipment goes 15 through, but we are not sare of the location of supports on 16 that floor f or that equipment.
17 ME. EISENHUT:
Well, we are sure of where the 18 supports are.
The reason the word "potentially" is there is 19 because you have to analyze it to see whether or not it is a 20 pro blem.
It goes back to -- that wasn't th e re.
I added 21 t h a t just a little while ago, because you really do not know
- 22. tha t until you do the analysis.
But we do know that these 23 are the systems, the piping that goes through this area.
24 Basically it is sort of separate from the
.5 reactor.
It is those support systems that goes in -- things ALDERSoN REPORTING COMPANY. INC 400 VIRGINIA AVE S.W., WASHINGTON. 0.C. 20024 (20R 554 2345
~.
E 22 t
1 like component cooling water tha t goes in of course that is c
c 2 needed for the resctor coolant pumps as ene example.
All 3 the safety' injection piping goes through this area.
The 4 residual heat removal system all goes through this arsa.
5 Ihe big pieces of equipment, per se, that are in 8 this area are things like the accumulatcrs, the hydrogen 7 recombiners, and of~ course the fan coolers tha t we have been 8 taling about.
i 9
So it is a 16-to 18-foot area.
The equipm: n t 10 tha t is there is actually a limited amount of equipment, but
_11 of course it is where the key piping that goes in and 12 rommunicates with the raatter that goes through.
13 nd again, this is just a listinc of systens that 14 are potentially af f ected that the utility is already nov 15 going through the process of looking at.
16 The last slide --
17 MR. JORD).N s This lead s na turally to you.
13 MR. EISENEUT:
The last slide, if I can have it?
19 (Slide.)
20 MR. EISENHUT:
This just summarires'where we are 21 today and where we are expecting, sort of the game plan of 22 where we are going.
^
.23 Ed mentioned the notifications to the region, the 24 P N.
"e did' issue a Board notification yesterday.
It was 25 sent to the Commission, the Appeals Board, the Board and all ALDERSCN REPORTING COMPANY,INC, 400 VIRGINIA AVE., S.W WASHINGTON. O C. 20024 (202) 554-2345
23 C-t 1 the parties in the proceeding, and it basically contained 2 the. three documents' we had with the de tails' a t the ti:e, the 3 abbreviations that contained the DN, that contained the
' 4 siaple letter f rom PGEE which was the notification per the 5 tech specs, and a PGCE press release.
6 Yesterday we had a rather detailed, at this 7 juncture ~, conference phone call with PGCE and a number of 8 parties on the Staff.
PGEE a; reed to send a follow-up 9 l'et ter today.
They are basically going to be-telling us.the 10 dotails of the information that we have presented here this 11 morning, which was largely gained through a telephone 12 discussion.
They will be sending that letter in today.
13 They committed to have it here by 5:00 p.m.
14 Following that, we will be issuing another Board 15 notification to all of the parties and sending out that 16 piece of inf ormation.
17 The second piece o' tne discussion with PGEE 18 yesterday was:
If we set up a meetinc on honaay, for PGCE 19 to come in and to explain to the Staff in some detail what 20 happe ned, to bound the problem as they understard it, where 21 they are going.
22 They told us yesterday that as of Monday they
- i..
23 expect to actually have reanalyzed some of the piping in the Is it a big 24 area to know the nagnitude of the problem 25 problem ?
Was the approach they uced conservative encugh I
L l
ALDERSoN REPCRTING COMPANY,INC, 400 VIRGINlA AVE., S.W., tNASPetNGTON, D.C. 20024 (202) 554 2345
24
-e 1 that it turns out that no modifications are necessary?
Eut 2 they are really trying to bound it.
3 The last two bullets here ate:
We will be sending 4 an.Information 'Jotice out to the industry fellowing that 5 meeting when we have enough definitive infor ation.
An 6 Inf ormation Notice, remember, is we just send it to the 7 entire industry that this is some information that you ought 8 to be aware of; it doesn't re, quire any action at that 9 juncture.
10 The last bullet is the piece where II and NER are 11 going to Continue to look at the PGET reanalysis and where 12 they are going.
It,is largely broken down between the two 13 b ullets.
ICE is looking at the actual error at the plant 14 and has been following along on the 79-14 aspects.
A 15 primary concern that NER has been pushing is the impact on 16 the overall seismic design adequacy of this error.
17 That is, the question:
Was this an isolated error 18 tha t occurred in one spot?
Or does it have implications for 19 the overall seismic design' 20 I have specifically asked PGEE to be able to 21 add ress that question on 'onday, and to try to give us some d
22 inf ormation to bound the problem and convince us that 1
23 eve rything we have done in the past on this plant on seismic 24 design is either all right, or it is not all right "because."
25 They said they will attempt to come in and present ALDERSON REPORTING COMPANY,INC, 400 VIRGINIA AVE., S.W., WASHINGTON, D.C. 20024 (202) 554 2345
-2:
25 1 that.
2 COHMISSIGNER AREAFNE:
Or, put "otherwise."
"It 3 is not all right, or it is all right because."
4 M R. EISE'iHUT That is correct.
I sait that 5 backwards.
It-is either all right, or not~all richt.
6 CHAIRMAK P ALL A DI:io Darrell, when you send these 7 bulletins out to the industry, do you alert those people 8 that have mirror-image plan ts tha t they may have tne same 9 problem?
10 MR. EISENHUT:
Well, presumably the Information 11 Notice #vould say just that; tha t we h3 ve id entified the 12 problem with the mirror image in the plant, and it is 13 provided for their information at this time and does not 14 require something on their part; but we want to alert then 15 at the earliest possible time.
16 CHAIRMAN PALLADINO:
But it might -- I don't knov 17 whether it. is proper to su7 gest that they look at it on 18 their ovn?
19 MR. EISENHUT:
'4e have been kncvn to suggest that 20 "here is something they ought i.o look at."
21 There has been an occurrence in the past some 22 mon ths back, perhaps even last year as - 'ch as time fli es, 23 a t the North Anna facility where a sirilar problem 24 occurred.
It was a symetry problem, and in that case I 25 believe it was connecting piping again outside the reactor ALDERSON REPORTING COMPANY, INC.
N10 VIRG NIA AVE S.V.
WASHINGTON. D.C. 20024 (202) 554-2345
26
.c 1
1 where they had to gc back and do a re-analysis.
j, 2
COFFISSIONER GIl!NSFY:
So what extent is the pf 3 79-14 review complete?
4 ME. JORDAN:
For operating plants, it is --
5 COMMISSIONER GILINSKY:
No.
In this case.
6 MR. JORDAN:
For Unit 2 it is not complete.
For 7 ' Unit 1 it was complete.
So that the individual that found 8 it, found it on their Unit 2 :f acility and then the concern 9 was applied' back to Unit 1.
10 COMMISSIONER GILINSKY:
I see.
I t wa s --
11 DOP.MISSIONER AHEARNEs Tt was not picked up in 12 doing the Unit 1 analysis?
13 MR. JORDANS That is correct.
14 CHAIRMAN PALLADINO:
That is strange.
15~
COMMISSIONER ~AHEARNE:
Would you not have expected
-16 them to?
17 MR. JORDAN:
Actually, the 79-12.as being an 18 as-built focuses on the hardware, a verification that the 19 piping as it is laid out in the isometrics is actually 20 installed in that fashion, and that the analysis that was 21 done is based precisely on the way it is installed.
22 So the next step back to the forcing functions 23 tha t were used was not a portion, a specific request fer 24 tha t bulletin.
25 COMMISSIONER AREARNE:
You are sayin; that it is ALDERSoN REPORTING COMP ANY, INC, f'
400 VIRGINIA AVE S.W WASHINGTON, D.C. 20024 (202) 554 2345
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27 r.
1 possible - tha t it could have been also missed in Unit 2?
2 MR. EISENHUT:
Yes.
By "79-14,"
I think --
3' 1R. JORDAN:
That is correct.
~4 1R. EISENHUT
-- 79-14 would not have focused on 9
5 it.
Escause as Jim Knight sort of looked a t it is an 6 excellen t example.
You have a book of floor response
~
7 spectra.
You pick it.
You go in and lay out your design on 8 a~ system, and you lay out where the supports have to go.
9 So you have now a detailed diagra: on, let's say, i
10 the RER system.
79-14 told the utility to take that drawing 11 on the detailed layout of RER --
12 COMHISSIGNER AHEARNE:
go look and see how it 13 was put together.
14 MR. EISENHUT
-- and to be sure that the supports 15 were put in exactly like the drawing was; that the drawing 16 neglects things, sometimes there are columns in the way.
So 17 you have ' to see how close you can actually have gotten to 18 t h e - d r a win g.
19 COMMISSIONER SHE7SNE:
They need not have gone 20 back beyond 21
.dR. EISENHUT:
It did not ask them to go back.
22 COMMISSIONER GIIINSKY:
So it wa s really PGCE 23 going beyond the bulletin in-Unit 2 --
24
- 33. EISENHUT:
Well, I think it was more PGCE
'25 doing their normal verification process on Unit 2, because a
~
6 ALDERSoN REPORT;NG COMPANY. INC, 400 VIRGIN A AVE., S.W WASHINGTON, D.C. 20024 (202) 554-2345
28 of o-1' utility.should be ooing through this standard Cuality 2 Assurance f unction to ensure that his layou t is in fact 3 acrurate.
We just have not locked into it in enough depth 4 to know exactly whether it was just his routine review.
5 COMMISSIONER BRADFORD - Let's see.
If it would 6 not routinely have been picked up in Unit 1 as part of the 7 Quality Assurance function, why not?
8 MR. DENION:
I dont think we know --
9 COMMISSIONER BRADFORD:
Why
-10 MR. DENTON:
In other words, I do not think we 11 know yet why it was picked up; what led the engineer to find 12 i t. - And it is hard,to --
13 COMMISSIONER BEADFCRD:
One of the concerns that 14 ocrurs to se out of this -- I guess it would come under your 15 last bullet there -- is the question of Quality Assurance 16 almost apart f rom seismic.
17 MR. EISENHUT:
That's right.
18
- 53. DENTON Well, what we do not know is whether 19it was an. isolated translation by someone sitting at a desk 20' 00p ying numbers, or whether it is more symtematic of a 21 breakdown in the process, and I am no. able to answer that
- 22. tod a y.
23 HR. EISENHUT:
But be assured it is a series of 24 things tha t I can ccamit that ICE will normally ba looking
- 25 at.in goin; -through this progress.
ALCERSON REPORTING COMPANY,INC.
400 VIRGINIA AVE., S.W., WASHINGTCN. D.C. 20024 (202) 554 2345
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q 29 s-1 COMMISSI0llER AHEARNE:
And NRR committing ICI.
2 (laughter.)
3
$3. JORDAN:
But ICI is looking into that.
~.' e a r e 4 holding hands on it.
5 COMMISSIGNES BRADFGED:
let me ask in the same 6 veins -Why is it not something that would have turned up in 7 our reviev processes of Unit i sometime ago?
-8 M?. DENTON:
That is because-we did not audit this 9 particular part.
We only do an audit to look a t 10 methodology, and criteria, and calculational tools, and we 11. adit a system or two.
Eut this occurs at a level of detail 12 tha t would' require thousanas of man-years to possibly find 13 in an isola ted exa mple, if that is what it is.
14-COMMISSIONER 3RADFCED:
Now if this had been an 15 a udited area, would we have gone into it in sufficient 16 detail to have found that?
17 MR. DENTON:
I will have to ask Jim about that.
I 18 doubt if we would have, though, from the way I understand it 19 - tod a y.
20 MR. KNIGHT:
No.
I would confirm tha t.
When I 21 was. speaking earlier, a s I mentioned, this type of error 22 which.is to me almost analogous to someone doing their 23 arithmetic wrong, all cf the sophisticated snalytical 24 mechanisms. tha t we look into were all --
25 COMMISSIONER BRADF0ED:
I think it is more like ALCERSoN REPORTING COMPANY,INC, 400 VIRGINIA AVE., S.W., WASHINGTON. D.C. 20024 (202) 554 2345 4
30 o.
1 writing down the wrong assignment.
2 (Laughter.)
3 5E. KNIGHT:
I' sorry?
4 COMMISSIONEE BEADFCFD:
It -is more.ine writing 5 down the wrong assignment.
6 ME.. KNIGHT:
Perhaps.
The direct answer is:
'd e 7 did - in f act do a' specific and, at that time, unique audit of a Diablo Canyon in this area.,' Again, we went back and in each 9 of the steps necessary from the determination of-the ground-10 motion all the way do in to the development of the ground 11 responce spectra, we took their commitment to us as to the
-12 criteria or the methodclogy they were using, and went in and 13 sampled actual problems that they had done to see that they 14..ad in f act applied that criteria, and that they had applied 15 it in a way that was technologically appropriate.
16 But we didn't, and we quite normally would not go 17 bark and say:
Now, did you pick, when you go t all of this 18 don e --
19 COMMISSIONER BRADFOED4 Did you use the right 20 pla n ?
6 21 MF. KNIGHT:
did you use the right one for the 22 corresponding place in th e line.
23 ME. EISENHUT That is all we were planning to 24 present.
25 CHAI? MAN PAlLADINO:
Darrell, I enderstand they
- LCERSCN REPCRTING COMPANY,INC, 400 VIRGINIA AVE., S.W WASHINGTCP' O.C. 20024 (202) 554 2345
F 31 L
3-1 have delayed their fuel loading.
Who will decide when they
'2 can restart that?
~4 h a t I am getting at is:
To what extent 3 must the Staff be satisfied that the corrective action is 4 appropriate ?
5 ER. DENTON:
I think at the moment they have 6 satisfied the Staff.
Where they have to sa tisf y other 7 parties, we will get to that.
At the moment the 8 understanding is that they will not load the f uel -until the 9 Staff is satisfied.
10 CO MISSICNEE GILINSKY:
'ih e n you say "the Ste f f" 11 is that you?
Cr is tnat ICE?
12
- 43. J0EDAN:
Both.
t 13
'MR. DENTON:
Both.
14 MR. JOEDAN:
The NEC Staff.
15 COMMISSIONER BRADFORDs Do you plan to confirm
- 16 tha t in any way?
I take it in terms of the legal structure 17 right now, they could go a' head.
18 MB. DENTON:
'J ell, i t seems a bit early for us to 19 confirn it.
I want to wait until af ter Monday and find out 70 more about the situa tion.
'Je have inspecto rs on the site, 21 so I do not think taere is any danger of their hreaching 22 their commitment.
Next week when we seem to know where it 23 is going, we vill consider that issue.
y 24 XR. JOEDANs And the utility did make a very rapid 25 ar.'
voluntary response.
That caamitment was strong fror 1
i ALCERSON REPcRTING CCMPANY,INC.
6 400 VIRGINtA AVE.. S.W., WASHINGTON O.C. 20024 (202) 554-2345
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('
1 them.
2 COMMISSICNER GILINSKY:
It sounds like it will not 3 be until Monday before you know the extent of this, or 4 whe ther we are talking about a long delay or a short 5 delay.
6 MR. EISEhHUT And then saybe not even Zonday.
I 7 had to press the utility pretty hard for them to agree to 8 come in Honday for e meeting.
We felt we wanted to have
~
9 more detailed.information a s soon as pcssible.
I had atked to for the meeting ~by Friday, and they just felt that they were 11 not in a position enough the:selves to be able to assess the 12 pro blem and tney have agreed to come in !cnday.
13 CHAIRMAN PALLADISC:
Do you have any preliminary 14 indication of how long the analysis is going to take?
15 MR. EISENHUT:
No, but we should have a better
~
16 answer, they said, by Monday to that question.
17 CHAIBMAN PALLADIN,0:
Are we talking weeks, 18 months?
19 MR. EISENHUT:
We don't kncv.
20 COMMISSIONER AHEARNE.
Well, there is another 21 thing; that since they are in a hole, there is nothing that 22 is going ahead thst~would sort of force you to have them t-22 come in sooner, ill prepared, is there?
24-MR.. EISENHUT
.i o, there is not, except that this 25 is an area that has been very sensitive.
t-ALDERSCN REPCRTING COMPANY,INC, dOO VIRG;NsA AVE., S.W WASFINGTCN O.C. 20C24 (202) 554 2345
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1 COMMISSIONER AREARNE:
Sure.
w r,
,o
}
2 MR. EISENHUTs It is pending before a few 3 pa r ties--
4 COMMISSIONER'AHEA?NE:
No, I understand that.
5 XR. EISENHUT:
And we felt 6
COMMISSIONER AHEARNE:
But you want to, as best
~
7 you can, to make sure that the analysis is thcrough.
8 MR. EISENHUT:
Oh, absolutely.
I am not pushing 9 them. for the complete analysis.
The thing-we were-.asking-10 was If they are doing one small piece of an analysis of.
11 the plan t, then we may decide tha t we want them te extend it 12 to other pieces --
13 COMMISSIONER AHEARNE:
Sure.
14 MR. EISENHUI:
-- and we want to know enough to 15 mak e that decision as soon as possible; tha t we should not 16 let 'them go down one path perhaps mistakenly and then. change 17 our mind s la ter.
Q 18 COMMISSIONER AliEARNE:
Yes.
19 ME, EISENHUTs So however long it takes them to do
. 20 the ' reanalysis, it takes.
~4 ha t partially led to the coming 21 in was the letter that they sent us was in fact a 22' one-paragraph let+ er, as you 've seen when we notified all 23 the parties, and some of that information I would not say is 24 "nisleading"; 'it was just very preliminary at the time, and 25 now information has evolved as it went along.
H e r. c e, that i ALDERSoN REPCRTING COMPANY,INC, 400 VIRGINIA AVE., S.W., WASHINGTON. D.C. 20024 (202) 554 2345
a
.s, 34
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1 why we asked for ano ther letter today, and a more detailed 2 discussion to have a dialogue on it on Monday, recognizinc 3 that we hai to get their experts and our experts together.
~4 MR. DENTON:
I think Commissioner Ahearne's 5 comment is correct.
There is no fuel in the reactor vessel,
,6 so in terms of time limits it is not an operating reactor 7 problem as where we are usually dealin; with valves in 8 question.
ha can wait as long as they need.
4 9
COMMISSIONER AHEARNE:
That is right.
10
'COMXISSIONER GII !NSKY :
Could you keep us informed 11 in one way or another?
12
.MS. DENTON:
Certainly.
13 MR. EISENHUT:
Well, as I mentioned, we will be 14 sending Eoard notifications each step down the line, a nd of 15 course the. Commission is a Board in this overall sense.
~
16 MR. DENTON:
I think you ought to let us read and 17 see what we learn Monday and see if it warrants another 18 Commission meeting, whether they have made any. progress.
19 COMMISSIONER BRADFORD:
Let me just ask a variant 20 of the Chairman's question:. Do you have a sense, if 21 every thing went very well and it turned ott that in their 22 vie w at least everything was adequate and the margins were 23 clear, w hat the minimum amount of time involved in doing 24 t h a t sort of an analysis would be?
25 MR. EISENHUT:
Well, they stated yesterday ALCERSoN REPORTING COMPANY,INC, 400 VIRGINIA AVE., S.W. WASHINGTON. C C. 20024 (202) 554 2345
35 1 optimistically that they could hope to define the affected 2 systems and have them reanalyzed in something in the order 3 of ten days.
4 COMMISSIGNER BRADFORD:
Then there would be 5 whatever time it took for you to satisfy yourselves?
6 MR. EISENHUT:
And if in fact it necessitated a 7 fix in the plant, it would require-whatever time it would 8 take to do that.
9 COMMISSIONER AHEARNE:
There migh t also, though, 10 be some additional time required to get some confidence that 11 this was the only affected system.
12-COMMISSICNE2 BRADFCED:
Right.
13 CHAIEMAN PAILADINO:
And you have asked them to do 14 tha t, ha ve you not?
You have asked them te examine the rest 15 of the system?
16 MR. EISENHUT:
Well, we have not asked them to--
17 We have asked them to provide some assurance to us so that 18 we can make an indepsndent assessment that the problem is in 19 f act limited to this one area.
They are not doing any 20 com puter re-analysis, for example.-
21 CHAIEMAN PALLADINC:
But they are examining the 22 baser that determine that there was no other errors such as 23 this?
24 MR. EISENHUT Yes.
25 CHAIPMAN PALLADINC:
Well, I think we would all ALCERSCN REPCRTING COMPANY,INC.
400 VIRGINIA AVE., S.W. VASHINGTON. O.C. 20024 (202) 554 2345
q 36 3
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4 1 like to be kept informed.
And when you get to the point of 2 so.me resolution, we particularly would like to be informed.
3 And based upon what informal notification ve.get, we may
[ -
4 want to have another Commissien meeting.
5 MR. DENION:
I would caution you, too, based on 6 prior experience in this area, the info rmation seems.to 7 changa sometine between'that received by telephone and then 8 received la meetings.
So today is jurt the 9
COM!ISSIONEE AHEARNE:
Well, this has to be v,ery
'to preliminary 11-MB. DENION :
That is ri;ht.
12 COMMISSIONEE AHEAENE:
-- because it is just 13 beginning to be examined.
14 CHAIR AN PALLADINO:
Are there any other 15 questions?
16
.(No response.)
17 CHAIRMAN PALLADINO:
If not, we thank you and look 18 forward to hearing from you again.
19 (Whereupon, at 11: 50 a.m.,
the meeting was 20 adj ourned. )
21 22 23~
'24 25 ALDERSoN REPORTING COMPANY. INC.
400 VIRGINIA AVE 3.W.. W(SHINGTCN. D.C. 20024 (202) 554 2345
MUCLEAR REGULATORY CO.T4ISSION This is to certify that the attached proceedings before the in the matter of:
pEFING ON DIABLO CANYON - INCORRECT SEISMIC ANALYSIS Date of Proceeding:
September 30, 1981 Docket Number:
Place of Proceeding:
Washington, D.
C.
,.were,- eh ld as herein: appears, and that this'. 'i:s th'e c~r igiriali 'tr an scrip t,
~
thereof "for the file of the Commission.
- -J Jane Beach Official Reporter (Typed) f i
d 1
-(
//
Op#icialReporter (Signature) 1 i
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BOARD NOTIFICATION 81 - 27 ISSUED 9/29 (PN; PGE 9/28 NOTIFICATION PER TECH SPECS; PRESS RELEASE)
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ADVANCED COPY TO:
O The Public Document"Roogh $ k
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DATE:
October 2, 1981 f
(
lotherdistributioni
% illgf\\P Attached are the PDR copies of a Commission meeting h
transcript /s/ and related meeting document /s/.
They p
are being forwarded for entry on the Daily Accession P
List and placement in the Public Document Room.
No Existing DCS identification numbers are listed on the individual gp documents wherever possible.
1.
Transcript of:
Briefing on Diablo Canyon -- Incorrect Seismic Analysis, September 30, 1981.
(1 copy) a.
Vugraphs presented at above meeting.
(1 copy) g N.. 'fa e-rown Off1 e of the Secretary l
.