ML16341C116
| ML16341C116 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 11/25/1983 |
| From: | Advisory Committee on Reactor Safeguards |
| To: | Advisory Committee on Reactor Safeguards |
| References | |
| ACRS-2146, NUDOCS 8403280307 | |
| Download: ML16341C116 (32) | |
Text
DATE ISSUE 11/25/83 PROPOSED MEETING MINUTES OF THE ACRS EXTREME EXTERNAL PHENOMENA SUBCOMMITTEE MEETING OCTOBER 12, 1983 - WASHINGTON, D.C.
The ACRS Subcommittee on Extreme External Phenomena met on October 12, 1983 at 1717 H Street, N.W., in Room 1167, Washington, D.C.
The purpose of this meeting was to discuss the use of the tau effect methodology and, in particular, its use in the seismic design analysis of the Diablo Canyon plant.
The information obtained during these discussions was to be used in the development of response to a request from Comissioner Gilinsky for ACRS commment on the use of the tau effect methodology into the Diablo Canyon seismic (Ref.
letters dated September 8 and 28, 1983 from V. Gi lilsky to J. J.
Ray).
The Subcommittee had discussions with its Consultants, the NRR staff, and represen-tatives of Pacific Gas and Electric Company.
The notice for this meeting was published in the Federal Register on Monday, September 26, 1983.
A copy of the notice for this meeting is included as Attachment A.
A list of Attendees is included as Attachment B.
A schedule for this meeting is included as Attachment C,
and selected portions of the handouts for this meeting is included as Attachment D.
A complete set of meeting handouts are included in the ACRS Files.
The meeting was begun at 3:00 p.m., with a short executive session in which Dr. Okrent, Subcommittee
- Chairman, summarized the objectives of the meeting.
The meeting was adjourned at approximately 6:45 p.m.
on this day, and was conducted entirely in open session.
.8403280307 831125 PDR ACRS 2146 PDR DESIGDATZD ORIGINXQ
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Certti'1e5 By
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Extreme External Phenomena Heeting Minutes 11/25/83 NRC Staff Presentations The use of'he tau effect in the Diablo Canyon seismic analysis was discussed.
The methodology was developed by Dr.
N.
Newmark to account for reductions in the free field response spectra which might be expected to occur as the results of interactions of a large rigid building foundation with the seismic waves.
The reductions, as used in the Diablo Canyon seismic analysis, were applied only to the horizontal response
- spectrum, with 2/3 of the free field horizontal response spectrum being used for the vertical response spectrum.
The reduction used for the turbine building response spectrum accelerations were the largest and were as large as 33<..
Some examples are shown on pages 1-8 of Attachment D.
The NRC Staff indicated that it was their belief that, if credit would be taken be taken in the analysis for what they considered to be reasonable amounts of ductility, then all structures could be qualified to the Kosgri design basis earthquake without the use of the tau effect reductions.
The reactor primary system components in general have large seismic design margins and can be qualified without the use of the tau effect.
The NRC Staff indicated that they believed, with considerable confidence, that safe shutdown would be achieved for the Hosgri design basis earthquake.
The intake structure is believed to be the most vulnerable.
The tau effect is viewed by the NRC Staff as a simple engineering approximation that is used as a mathmatical convenience to account for a variety of physical phenomena that reduce the foundation response to a level below that of the free field.
The
Extreme External Phenomena Meeting Minutes 11/25/83 NRC application of the tau effect was unique to the Diablo Canyon analysis.
This approach has not, to the NRC Staff's knowledge, been used in the design or analysis of any foreign plants.
The NRC Staff stated that physical effects included in the tau effect methodology may have been accounted for by some other means in some applications.
The NRC Staff stated that they have not, since the time of the ACRS 1978 letter on Diablo Canyon, developed any information which would significantly effect the ACRS conclusions.
The NRC Staff also stated that information had become available which would tend to confirm the ACRS conclusions.
The NRC Staff discussed a number of estimates that had been made for the reccurrence interval of earthquakes of the size of the Diablo Canyon SSE i n the vicinity of the site.
Work by Bloom, Anderson and Trifunac, the
- USGS, Selger et al, and Thenhaus et al was discussed.
A summary is included page 9
of Attachment D.
The estimates for a
PGA of 0.5fg being exceeded ranged from 10
/yr to 10
/yr.
Mr. Hock (PGPiE) indicated that the PGSE was currently analyzing the Diablo Canyon instrument data for actual earthquakes (for relatively small accelerations) to determine if tau effect type reductions from free field response spectrum exist.
It appears from the preliminary analysis that reductions do exist.
It is expected that this work will continue, and will be transmitted to the NRC at such time as the analysis is completed.
General Discussion There was some discussion among the Subcommittee Members and the Consultants as to whether the tau effect could be derived from basic engineering or
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.Extreme External Phenomena Meeting Minutes 4
11/25/83 scientific principles.
It was concluded that it'could not but rather was based on experience and engineering judgement.
There was, in addition, a
general agreement as to adequacy of the seismic design basis for Diablo Canyon.
The agreement, however, did not extend to the manner in which the tau effect reductions were used in the seismic analysis.
There appeared to be considerable uncertainty as to how this phenomena could be described quantitatively.
NATE:
ADilITIANALMEETING DETAILS CAN RE OBTAINED FROM A TRANSCRIPT OF THIS MEETING AVAILABLE IN THE NRC PUBLIC DOCUMENT ROOM, 1717 H
- STREET, N.W.,
WASHINGTON, D.C.,
'OR CAN BE PURCHASED FROM TAYLOE ASSOCIATES, 1625 I
- STREET, N.W.,
SUITE 1004, WASHINGTON, D. C. 20006, (202) 293-3950.
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I'he meeting when a transcri<iabeing by meiiiba'ra ofthe Subcoinmittee, its".
t,"and questions niaybe aa)ca8Ithly tanta. and StaK Persona desiring membecaoftheSubconmB&ee,theI'r-to jcalstataInentsshou)dnotify.:
ultanti; ind:StaK Niincnr tkkiHng ( 'bs.BisitJnated Fohn'al Bmployee as far "J.e or'al statcrnc~ ahmcld aaS'y inidvanca is pricticaMe so that -;::.,:-
g)eslghated Federal Employe'e as far'ppropriate arrang'ements can be made advance as practicable so that to allow the necessary time during the'.
. PI'.ate arihjements daa be'iceman,.
mee~ for such statements. ~',,
allow the necessaly time during the
",. The entire meeting wiHbe open to
" ting for such statement(t: j::>>..".c;
~ public attendance.,
The entiri meetlngwiHbe o'pen't'o":7 r '.The'agenda far subject meeUngshall bBCaltendanoe::" ~"I'-"-'-~:.~g 9 ""--'eaa fOHOWS::,'>4 ='-.'~'
~ 'C The agenda for subject meetidg shaH:
'.Wednesday, October Zy, 15%'8.3(7
's foHows:":: ~: '
~ '-'
c(aa untilthe conclusion ofbusiness.
'JVedtiesdoy, October 12, 19tt38:30
(
The Subcommittee willreview a
. untilthe conclusion ofbvsir(ess.
revision of the August 5, 1S83 draft,.
The Subcommittee willreview: (1)
Severe Acddent Research Program NRC position in generic
~ ecision paper, Tiffs revision wiH mmendations for steam generator include a more detailed description of integrity and (2) single and multiple the technical issues and subissues and ruptures in one and multiple steam the status of the correlation of these tora.'.
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issues to thesegulatory questions.
Duriltg the initialportion ofthe.. -.
During the initialportion of the ecting, the Subcommittees.
a?ong with 'eeting, the Subcommittee. along with y of their consul tents who,may be:
any ofits consultants who may be ent, may exchange preliminary...
present, willexcnange preliminary ews regarding matters to be views'regarding matters to be considered during the balance of the considered during the balance of the
'meeting... ~,
meeting..
'be Subcommittees willthen hear Tbe Subcommittee willthen bear sentations by and hold discussions presentations by and hold discussions
.'with representatives of the NRC Staff, with representatives of the NRC Staff,
,.its consultants, and other interested "
its consultantsr and other interested persons regarding this review.
~
persons regarding this ~icv:.
Fr<der information rega~ topics Further information zeg"-dhg tcjim tobe discussed, whether the meeting
- to be discussed, whether the meeting hss been cancelled or rescheduled, the has been cancelled or rescheduled.
thc Chairman's ruling on requests for the Chairman's ruling on requests for the opportunity to present oral statements opportunity to present oral statements
'nd the time allotted therefor can. be and the time allotted therefore can be "obtained by a prepaid telephone'calf'to obtainedby.a prepai'd telephone caH to the cognhant Designated Federil,
the cognhant Designaled Federal
. Employee. Mr. Elpidio lgne (telephone,.
Employee, Mr. Gary Quittschreibcr or 202/r<'cs-1414)'or Mr."Anthony'Cappucci Staff Engineer, Mr. Alan B. Wang
(". "/634-3267) between 6:15 a.m. and (Telephone 202/634-3267) between o.'"'r p m.. e,d.t.
a.m. and 5:00 p.n:.. e.d.t.
a,<<vd; Seprerober Ir<. l<O<3.
Dered: September sn. ISS3.
'lohr l'oyle, John C. Hoyle,
<dr.<<.-y Cr<mmi((eehfonel omen(Officer.
hdvisory Commi(Ice h1onogement Oi(..:.
tfRn<< ~l4$ f<44s <<~ 44 oa) ea.u<ro coos r~im sahara coos lN44MI
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Advfsory Committee on Reactor -:--.. Advfaory Committee on Reactor W
,, Accidents; Meeting -..., -.Extreme External Phenomena; Meeting The ACRS Subconunlttee on Class-9,
.The ACRS Subcornuiriee on Ep.uo.
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Accidents willhold a meeting on External Phenomena willhold a mooring Octnber 12. 1983. Room 1187 at 1717 H on October 12, 1983. Ron:n 116 Street. NW.. Washington, DC.
Street. NW, Washington. DC.
ln acr.<:rdance with the procedures In accordance i~itb ll;"-;<-" ~-
Oulliued in the Federal Register on outlined in the Federal Re 'lster <~.
Or.lober 1, 1982 (47 FR 43474), oral or October 1.1982 {47 FR 434<4), o ol u<
vr..tcu st tourents may be presented by written statements Iris be p<e~<::.r<."
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n:;".-..bors of the public. recordings will members of the publir r<<r,.r<.".<,; v....
be permitted only during those portions be permitted only during those pnr>>e"-
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oi the meeting when a transcript ls being of the meeting when e transcript is bf.8 kept, end quesllons may be asked only kept, and questions may be rrekcd r<u'.<.
by members ofthe Subcommittee, Its'.-','.
~
consultants and Staff. Persona desiring
.'o make oral statements abould notify the Designated Federal Employee a>> far inadvance as practicabla so Chal-~.::
appropriate alranigsaents can be made to aHow th'e necessary tim'e during the "
meeting forsuch statement'a ia';.'",..
. The entire meethg willbe open to...'"
public attendance:I
'<:-:;. '.=~';
-.".'he agenda forsubject meetntg shaH be as foHows:
J4lednesdoy, October Ig, ZR8-8M "
p.m. untO the conch(s(on ofbusiness..',
The Subcommittee willdiscuss the.
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use of the "tauwffect"in evalua5ng. l seismic design margins and the seismic.
design basis forJrucl ear pc+(er plants.
with emphasis on its use for the Diablo Canyon site.,
During the initialportion ofthe meeting. the Subcommittee, along with any of its consultants who may be present, may exchange preHminary.
views regarding matters to be.
considered during the balance ofthe meeting.
The Subcommittee willthen hear presentations by and hold discussions with representatives ofthe NRC Staff.
their consultants. and yther.interested persons regarding this review.
Further information regarding topics; to be a>scussea.
whether the meeting has been cancelled or rescheduled. the-:
Cb airman's ruling on requests for the
","pnrtunity to pr..
nt oral statements and the time allotted therefor can be:..
obtained by a prepaid telephone call to,,
the cognisant Designated Feclera)c,
'r;-!..-,.
Employee, Dr. Richard Savio (talapbcat,-
" 2/634-3267) between 8:15 ann.
and':00 p.m., e.d.t.
D~:ed: Seprenber K. 1963.
. Hoyle,
< '.n<<ryComn(i((~hlonogemenl O(fleer.
<<'<l ~Anal~;e45aa) r
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SECUPITlES ANDEXCHANQE COMh!ISSION, "=. ~: "..;--, ~"
Iastsssa tCO. 2029t; He NxSlbAma.,~:... ':.;..
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American Stock Exchange, Inc. Order Approving Proposed Rule Chanye Seotcn:her 20.1983.
~".rc uant lo Section 19(b){1) of lhe S
urities Exchange Act of1934.15 r.ra,C. 78s{b){1), (the "Act"),and Rule
~
- ~ tnereunder, the American Stock
<':.chango, inc. ("Amex"), 86 Trituty Place, New YorkNew York10006.
submitted on August 9, 1983 a proposed rule change to amend Amex'ule 903C
TINE DATE NEETI ROO
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0-'il-f3 ADVISORY CONNI'tTEE ON REACTOR SAFEGUARDS NEETING lO4 (PLEASE PRINT)
NAME ATTENDEES PLEASE SIGN BELOW BADGE NO,,
AFF ILIATION Y.~-"i 7J>>. +:, ~/ifp"" r~r S.'('i.~ Ka 8=- ~~/g So~
p-OISIN E-sill E-hatt ~ng~ (6.g / ~ r / L'n g/23/83 AGENDA FOR THE OCTOBER 12, 1983 MEETING OF THE ACRS SUBCOMMITTEE ON EXTREME EXTERNAL PHENOMENA l. Executive Session - D. Okrent/C. P. Siess - History of the ACRS revi'ew of the Diablo Canyon seismic issues and the "tau effect" and the discussion of the Subcommittee's objectives 2. Presentations by the NRC Staff to Address the guestions in Attachment A 3. General Discussion 4.
- Comments, Summary, and Conclusions 3:00 - 4:45 pm 3:45 - 4:45 pm 4:45 - 6:45 pm 6:45 - 7:30 pm
~ ~ 2.5 2.0 7% v'= 0.00 z ..0t-ttJ ttJUU ttJI-0 00 tjJ CL I.S I.O 0.5 0 0 7% w= 0.00 to l5 CONTAINMENTSTRVCTVRE DIABlOCANYONUNITS I 8 2 HOSGIZI 7.5M/DLUME SPECTRA v = O.OJt vs v = 0.00 25 0.75 067 35 FREQUENCY (HERTZ) A 2.5 I I I 2.0 7% v = 0.00 I.5 I.O vx ~=0.no 0.75 0.5 0 0 f( sf.g IO IS 20 CONTAINMENTSTRUCTURE DIABLOCANYONlNITS I 8 2 HOSGRI 7.5M/PAWMARK SPECTRA 7' O.N vs v = D.OO 25 30 0.60 FREQUENCY (HERTZ) 2.5 2.0 Z0 V O OI OD ttj 0. I.5 l.0 0.5 0 7% T= 0.00 I t I
- t 7% v= 0.052
~ 'I f IO I l I I I 20 AUXILlARYBUILDING DIABLOCANYONLIMITS l 8c 2 HOSGRI 7.5M/BLUME SPECTRA v = 0.052 vs s= 0.00 25 0.75 0.63 FREQUENCY (HERTZ) t 2.5 2.0 = 0.00 z0 K VU 7% v = 0.052 0.75 0.5 0 0. kp I S ar l5. 20 AUXlLlARYBUILDING DIAI3LOCANYONUNITS I 8 2 HOSGRI 7.5MfhEWMARK SPECTRA ~=0.052vs v=0.00 25 0.55 FREQVENCY {HERTZ) 2.5 2.0 7% w= 0.00 z0I-tU UU O S 0Q PL I.5 I.O 0.5 0 0 I I I I I I I l I I I I I I I I I I I I I I I I I I I I Il I I I I I 7% v'= 0.08 IO 20 TLR8lhE BVILDING DIABLOCANYONt+llTS I 8c 2 HOSGRI 7.5MIBLUME. SPECTRA v = 0.00 vs w = 0.00 25 0.75 0.54 FREQUENCY (HERTZ) 2.5 2.0 I I = 0.00 1.5 1.0 7% T= 0.067 0.75 0.5 TURBINE BUILDING DIABlOCANYON UNITS 1 8 2 HOSCR I 7.5M/NEWMARK SPLCTRA < 2 0.067 VS += 0.00 0 10 15 20 FREQUENCY (HERTZ) ,25 30 ~ ~ ~ 2.5 2.0 7% v'= 0.00 z0I-K Ul lUUU LLJ 0 N 0Q LU tL I.5 I.O 0.5 7% = 0.04
- IINTAKEST RUCTURE I
- .IDIABLOCANYON UNITS 1 8 2 I J HOSGRI 7.5 M/GLUME
'.I SPECTRA <= 0.04 vs r=0.00 0.75 0. 0 0 IO I5 20 30 35 FREQUENCY {HERTZ) 2.5 C I I 2.0 7% T= 0.00 I.5 I.O 7% ~= 0.04 0.75 l OA I 0.5 0 0
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- '::':: :.:.:3 IO f i08k I5 20
<= 0.04 vs r= 0.00 I 3 I '25 "-':='.:-:::: I INTAKESTRUCTURE l DIABLOCANYONUNITS I 8 2I ) :.;..'::-:-':::-'lHOSGRI 7.5 M/NEWMARK 3, ',:::;::;l SPECTRA I 35 FREQUENCY (HERTZ) c'7 TRIFUNAC-BRADYf1975) 20 x 10 YEARS. "13 FAULTS" -2 CL UJ UJZ02 -3 b UJb UJ UJOX UJ O') O CL LL -5 CI C90 SAM 10.CGO YEARS "13 FAULTS" C-GRhDY TRIFUNA I19ta) 10 000 YEARS "13 FAULTS" SAM 20 x 10 YEARS "13 FAULTS" -7 0 100 2C0 500 1000 2CCQ 3000 5000 10.000 PEA!< INSTRUMENTALACCELERATIONIo, gab) Figure 2 COMPARISON OF ANDERSON-TRIFUNAC AND GLUME RESULTS FOR DIABLO CANYON (AFTER GLUME. 1970) o 5ELZER Al)D OTHERS (1978) 0 THE),'H"US A)ID OTH RS (1980) A ~