ML20205D078
| ML20205D078 | |
| Person / Time | |
|---|---|
| Issue date: | 03/06/1987 |
| From: | Advisory Committee on Reactor Safeguards |
| To: | Advisory Committee on Reactor Safeguards |
| References | |
| ACRS-2487, NUDOCS 8703300329 | |
| Download: ML20205D078 (10) | |
Text
-?
+
OMS-M87 m
fTnGP:
twvsqqn h
CERU FIED COPY:
In DATE ISSUED: P. arch 6,1987 s
SUMMARY
/ MINUTES OF THE, ACRS SUBCOMMITTEE ON STRUCTURAL ENGINEERING
- ~
JANUARY 21-22, 1937 e
ALBUQUERQUE, NEW HEXICO The ACRS Subcommittee on Structural Engineering met at the AMFAC Hotel in Albuquerque, New Mexico on 'Japuary 21-22, 1987 to review resurch programs en cor.tainment integrity and se.ismic Category I Mructure.
In addition, a tour of.the scale model rei9 forced concrete containment was made.
Notice of the meeting was published in the Federal Register an Decembe-23, 1986 (Attachment A). The schedule of items covered in the meetinr, is in Attachment B.
A list of handouts'kapt tdth the. office copy of the
/
minutes is included in Attachment C.
There.were no written or oral statementsreceivedorpresentedfroiEmberso'thepdblicatthe meeting. _ E. Igne was the Cognizant ACRS Staff Member for the meeting.
Principal Attendees ACRS D. Siess, Chairman C. Mark, Member i
l M. Bender, ACRS Consultant NRC Staff J. Costello G. Arlotto Sandia Los Alamos National Laboratory W. von Riesmann J. Edwards D. T. Clauss J. E. Hyder D. Dahlgren~
D.'Metzger J. Weatherby J. Bennett L. Parrish C. Anderson j
l D. S. Horschel
([ f1[]S,,;)
NW ORME.
fPlll %lf t;g g gg
{ g33 g 9 870306 Co,tified By h)%'
k 2487 PDe
T' f
i Mihut s/ Structural Engineering 2
gi::.m;ary 21-E2,1987 IH
'4 i, ' *T dthers N+
t P. K. Agrawel, Sargent & Lundy J. Ucciferro, United Engineers & Constructors H. Eckert, NUS D. A. Brinson, International Eneroy Asso. Ltd.
Highl fghts:
0-1.-
gth respect to reinforced concrete containment model and Category n \\,
3 I structural tests, C. Siess, stated that there is always a limit in o s A
both time and money on how many large-scale configurations can be tested
+,
'_ ;W b
._ and the significance and the value of the results are, determined by how 3well one can predict the behavior in the model tests by analysis.
If
',' one'is abl'e to satisfactorily predict the behavior in the model tests by
\\sj'
),
analysis, then behavior of prototype structures could also be predicted ii g.y i with confidence. This theme of analysis versus test is a maior issue in l
/
performino model-scale structural testing.
s
- s...
i 2.
In reply to fl. Bender's question regarding the inelastic behavior Y
prediction of containment structures, it was stated that the containment y,h N integrity tests are aimed at the ultimate behavior, and the analysis x:'l performed accounts for its inelastic behavior.
In addition, it was N<
s stated that the containment testing program is directed to PWR containments only.
But since the objective is to predict by analyses s
containment IPWR or BWR) behavior to failure of all the containment phenomena e.g., leakage, buckling, gross yielding, etc. one should then s
7, v
be able to apply with confidence the analytical methods to predict the behavior of prototypical PWR and BWR containments.
e
--7 y
sin
-% v )
t)
H O
e
,1, 3 Minutss/ Structural Engin2: ring 3
January 21-22, 1987 F
U g i 3.
J. Costello,s RES, provided an overview of the meeting.
as
'9+
He stated tha_t the initial thought on the, res' arch on' containment integrity was to e
t e
develop a data base sterraing from experiments that were constructed to s.
e
.3
) test predictive mathods so that one could use either with confidence or 1
.~s with some rational appreciation'of their uncertainty, existing computational tools. So far, existing computer codes are adequate to i
predict steel cor:tainment. behavior to failure. He stated that O
M essentially all efforts on steel containment research is complete, and
' )
that questions on containment behavior, e.g., gross shell failure or 3
leakage'through a penetration (except valve leakage, which is now N '
ocho,ing)'cannow;be,confidentlyprediEted.- Further, J. Costello stated s
i
- \\
L
,\\ p
' 'I that at the present time he believes that the computational methods h;j developedforthePWRcontainmentarehpplicabla to RWP. containment h
i lf configuration and that no further experiments in this area are reauired.
t gj 4.
In reply to a question by C. Siess on what we have learned from the research on steei' containments J. Costello responded as follows:
1.
s-
,s I
1,
(
4 o
Me have learned that existing large deformation codes are adequate to predict local deformatione hcrains and displace-ments) hp' to the failure range. n't < t' MARC and ANSYS s
,j computer codes available to the technical community produced results that correlated well with experiments.
o We have acquired a data base of analytical and experimental evidence to show that if the global strain in the steel containment shell is less than 2 or 3 percent, we have a high
s JK
- Minutes / Structural Engin cring 4
qw, January 21-22, 1987
,p.
^
level of confidence that catastrophic shell failure will not
~ occur.
From this knowledge, we can calculate with a high confidence level an upper bound, capable pressure, for the steel containment (by limiting the global hoop strain due to t
internal pressure to less than 2 or 3 percent).
o We have learned about the behavior of containment penetrations
, s with large deformations. With these deformations as input to a computer code, one can determine if the penetrations will leak and the extent (leak rate) of leakage. This type of information, in con. function with knowing by calculations the capable containment pressure, have a significant bearing on the emergency operating procedures i.e., venting of the containment.
A 5.
C. Siess stated that the steel model containment test showed that you will get failure at a local discontinuity of strain e.g. at a discontinuous geometry (stiffeners), or abrupt thickness changes. The lesson to be learned is that you don't try to predict when it is going to fail at a local discontinuity (difficult or impossible to do) but to back-off in pressure far enough so that the worst discontinuity in the containment won't cause a failure (at this point the pressure is called capable pressure for the containment).
l
1 Minutss/ Structural Engin2: ring 5
January 21-22, 1987 i
6.
C. Siess stated that the NPC must decide whether they want to know everything there is to know about containment failure or whether we want to know what we can learn in a reasonable period and cost that could be used in order to develop emergency procedures in order to protect the health and safety of the public.
7.
J. Costello summarized the foreign countries' coordination activ-ities on steel containments.
In Germany, some material experiments and tests on the behavior of local strain characteristics were performed on uniaxial specimens. But the Germans did not perform any pretest pre-diction since their containment designs are spherical.
In Sweden, we have had very little collaboration because they are venting their containnerts. Their studies on containment are aimed at assuring that there is no failure mode at 1.5 times the design pressure, or about the venting pressure. RES is exploring with England the possibilities of collaborating on a test of a model of the Sizewell containment, which is similar to the SNUPPS containment.
The Japanese program was discussed by G. Arlotto, PES. He stated that there is a difference in testing philosophy between the USA and Japan.
In Japan, proof testing for the design conditions are all that is l
necessary and testing beyond the design basis or testing to determine structural margins is not performed.
For example, the Japanese will test a PWR loop at the Tadatsu shake table up to the normal seismic design input; if the loop proves structurally adequate at the normal seismic input the test is complete. After completion of this test, the supports loop will be modified, under agreement with the Japanese and l
L
.T Minute 3/ Structural Engin:cring 6
January 21-22, 1987 the NRC, by EPRI and BNL and tested in the elastic and inelastic range in order to study elastic-plastic piping behavior.
In Japan, studies of structural margins beyond the design conditions are performed by the universities.
8.
In reply to a question from C. Mark, it was stated that negative pressure in the containment can cause buckling, but buckling is not failure per se because you still have integrity of the containment (failure pressure where leakage occurred was many times the buckling pressure).
It was stated also that buckling pressure can be predicted with currently available state-o#-the-art techniques.
9.
M. Bender stated that based on our model steel containment analyses and tests, how can I fudge the Sequoyah containment; or at what level (internal pressure) can we have reasonable high confidence it won't fail? No formal analysis on this ouestion was made by NRC.
10.
W. von Riesemann, Sandia, discussed the status of the reinforced concrete model test program. He stated that the 1:6 scale model testing will begin in Feb./ March 1987.
C. Siess stated that the primary use of the scale model should be to test the calculations.
W. von Riesemann agreed.
In addition, results from this test will yield information on the behavior of mechanical / electrical penetrations for leakage and its prediction. A peer review group consisting of experts outside of Sandia has been formed to review this program.
M. Bender thcught that periodic
Minut s/ Structural Engin:ering 7
January 21-22, 1987 6'
written reports should be made by the peer review group on the status and guidance provided.
11.
J. Bennett, Los Alamos National Laboratory (LANL), discussed the seismic Category I structures program. The objective of this study is to conduct experiments and analytical studies on Category I structures above the initial seismic design conditions (in the elastic-inelastic range), in order to develop analytical techniques that can be applied to prototypical structures. Tests have been performed on various types of shear-wall structures since 1982. A major concern of this study is the reduced stiffness due to concrete cracking. The question of investigating this phenomennn further by tests on a more complicated structure, was questioned by C. Siess. He stated that the results of these tests was primarily to develop calculational techniques and that a more complicated structural configuration is not needed to demonstrate the reduction in sti#fness observed in all of the tests made to date.
Results of previous tests are being considered for incorporation by code committees to upgrade ACT and ASCE Codes in this erea.
NOTE:
A transcript of the meeting is available in the NRC Public Document Room, 1717 H Street, NW., Washington, DC or can be purchased from ACF-Federal Reporters, 444 N. Capitol Street, Washington, DC 20001 (202) 347-3700.
l
-4
- }
e ATTACHMENT A - r Federal E:;;'d:: / Vol. 51, No. 246 / Tuesdiy, Dec:mber 23, 1986 / N;tices'
- M, p[l
=
y h
Deted: Doceanber is. tees.
e' AsMoory Comssdetoe en Reector AMoory Committee on Reactor Marsen W.Uhmain.
.7 g
/
ogguards; Subcommittee on W; e, Subcommittee on Structuret E O-- Orii; Meeting Assisfont Executive Dimerorfor rmiset
(* p* Julatory Pol 6c6es and Proct 6ces; (TR Doc. es. ass 17 %d ime; IIt45 em]?A Q
{[
,=
Review.
I he ACRS Subcommittee on
- ^;
De ACRS Subcommittee on Structural Enginee. ng will hold a coo m.e Regulatory Policies and Practices will meeting on January 21 and 22,1986, at g.
h;Id a meeting on January 14,1987, the AMFAC Hotel,291D Yale Blvd., SE.,
.f
~ ~.
Room 1046,1717 H Street. NW.,
Albuquerque.NM.
PACIFIC NORTHWEST ELECTRIC l
POWER ANDCONSERVATION Washington, DC.
%e entire meeting will be open to PLANNING COUNCIL
(
The entire meeting will be open to public attendance.
public attendance.
The agenda for the subject meeting The agenda for the subject meeting shall be as follows:
Reopening of Public Comment on
[.
Certain Recommendanons To Amend t E shall be as follows:
Wednesday, January 21,1N7-&30 Wednesday.Jcnuary 14.1987-9.00 a.m. until the conclusion of business.
f*
a.m. until the conclusion of business.
Thursday, January 22,1987-&30 a.m.
The Subcommittee will begin its until the conclusion of business.
Aoswcy:Pscific Northwest Electric i
current review of the nuclear plant The Subcommittee will review
' Power and Conservation Planning j
regulatory process.
containment integrity and Category I Council.
Ors' statements may be presented by structures, and other related programs.
action: Columbia River Basin Fish and t
members of the public with the Oral statements may be presented by Wildlife Program: Notice of Reopening i
concurrence of the Subcommittee members of the public with the of Public Comment on an Application l
Chairman; written statements will be concurrence of the Subcommittee for Amendment.
- cecipted and made available to the Chairman; written statements will be
""]I" hi acinc o
Committee. Recordings will be permitted accepted and made available to the Ele cnly during those portions of the Committee. Recordings will be permitted tim Planing CouncH (h meeting when a transcript is being kept.
only during those portions of the Council") gives notice that it is and questions may be asked only by meeting when a transcript is being kept' reopening the riod in which public members of the Subcommittee,its and questions may be asked only by comment will received on proposals
'i consultants, and Stcff. Persons desiring members of the Subcommittee,its of the U.S. Army Corps of Engineers to to make oral statements should notify consultants, and Staff. Persons desiring amend the Columbia River Basin Fish ACRS staff member named below as to make oral statements should notify and Wildlife Program, specifically, propriate arrangements can be made.
far in advance as is practicable so that schedules for the development of
' I,
'n advance as is practicable so that the ACRS staff member named below as proposals to alter the Program's During the initial portion of the appropriate arrangements can be made.
mechanical bypass systems at certain muting. the Subcommittee will During the initial portion of the Columbia and Snake dams, and to j.
l exchange preliminary views regarding meeting, the Subcommittee, along with amend the Program's policy regarding matters to be considered during the any of its consultants who may be transportation of anadromous fish on b: lance of the meeting.
present, may exchange preliminary the Columbia and Snake Rivers.
l The Subcommittee will then hold views regarding matters to be OATas: Comments on the U.S. Army discussions with representatives of the considered during the balance of the Corps of Engineers' application to nuclear industry regarding this review.
meeting.
amend the Columbia River Basin Fish r
Further information regarding topics The Subcommittee will then hear
-and Wildlife Program must be received to be discussed, whether the meeting presentations by and hold discussions in the Council's central office by 5 p.m.
V has been cancelled or rescheduled. the with representatives of the NRC Staff, Tuesday, January 30,1987.
Ch-irman's ruling on requests for the its consultants, and other interested Aponess:850 Southwest Broadway,.
l cpportunity to present oral statements persons regarding this review.
Suite 1100. Portland, Oregon 97205.
[
cnd the time allotted therefor can be Further information regarding topics con runTwan sNeonesATioN CONTACT:
tblained by a prepaid telephone call to to be discussed. whether the meeting Rick Applegate, at 850 Southwest i
the cognizant ACRS staff member, Mr.
has been cancelled or rescheduled, the Broadway. Suite 1100. Portland, Oregon 5;
Gary Quittschreiber (telephone 202/84 Chairman's ruling on requests for the 97205,(503) 222-5181.
p 3287) between 8:15 a.m. and 5:00 p.m.
opportunity to present oral statements suPPt.aassNTAnY INFOResAftoM:On Persons planning to attend this meeting and the time allotted therefor can be November 15.1982, the Council adopted cre urged to contact the above named obtained by a prepaid telephone call to a program designed to protect, mitigate Individual one or two days before the the cognizant ACRS staff member.Mr.
and enhance fish and wildlife affected scheduled meeting to be advised of any Elpidio G. Igne (telephone 202/634-1414) by the development and operation of changes in schedule, etc., which may between 8:15 a.m. and 500 p.m. Persons hydroelectric projects in the Columbia have occurred.
planning to attend this meeting are River Basin. It adopted the program in l
urged to contset the above named accordance with its authority under the Dated: December 18,1986.
individual one or two days before the Pacific Northwest Electric Power scheduled meeting to be advised of any Planning and Conservation Act.16 3.
l Assistant Executive Directorfor Project changes in schedule, etc., which may U.S.C. 839 et seg. ("'Ihe Northwest Power Act").The Council amended the Raw have occurred' rFR Doc. 86-28816 Filed 12-224 8.43 am)
Program on October 10,1984. It received applications for further amendment of ma oona 7sse-ous e
e
ATTACHMENT B l,J TENTATIVE AGENDA ACRS SUBCOMMITTEE ON STRUCTURAL ENGINEERING ON CONTAINMENT PERFORMANCE RESEARCH AND ADEQUACY OF CATEGORY 1 STRUCTURE 5 AMFAC HOTEL
~
ALBUQUERQUE, NEW MEXICO JANUARY 21-22, 1987 Wednesday, January 21, 1987 eM.
I.
Chairman's Opening Remarks 8:30 - 8:45 a.m.
II.
Introduction and Overview of N:45 - 9:45 a.m.
Containment Model Tests and Supporting Analysis, NRC-RES/SNL 12 ; 4-o III.
Presentation on Model Design, 9:45 - 4G+00 N00N Construction & Instrumentation, SNL
[ Note: A 15 Min. break at about I 'S
- 10:30a.m.]
( ti do I
LUNCH E.00 - 1:00 p.m.
IV.
Pre-test Analyses and
-1+00 - 6:0G p.m.
Post-test Plans, SNL I; w V.
Site Tour of Containment Model, (Approx. 2-3 Hrs.)
SNL VI.
Recess (Approx. 6:00 p.m.)
Thursday, January 22, 1987 x
qMS VII.
Chairman's Comments 8:30
-F.45 a.m.
9:tf 11: W VIII.
Penetration including airlocks 45 - -10: 45 a.m.
and related experiments and analysis,SNL/CB&I Rowd tlatss m vu ir.z.o 40:4b -14540-the.
BREAX W.%S' xD IX.
Overview of Category I 4+t00
-12500 N00N Structure Program, LANL trnu ( 'A5
-12:00 - 1:00 p.m.
LUNCH X.
Results of Past Model Tests
-74ok 1:00 - 3:00 p.m.
and Discussions of Future Tests, b ^-
LANL qveu
/ge. p nir, XI.
Subcommittee Discussions 3:00 - 3:30 p.m.
XII.
Adjournment 3:30 p.m.
m 14 ATTACHMENT C h/:
HAND 0UTS FOR JANUARY 2]-22, 1987 MEETING STRUCTURAL ENGINEERING-1.
Prefatory Topics
. Jim. Costello, RES 2.
NRC Containment Performance Programs at Sandia National Laboratories -~ Walt Von Riesman, SNL 3.
Experiments on Containment Models Under Extreme Loading Conditions-(Fin A]249) - Daniel S. Horschel 4.
Coordination of Analysis of the 1:6 - Scale Reinforced Concrete Containment Model - D. B. Clauss 5.
Analysis of the Sandia 1/6th-Scale Reinforced Concrete Containment Model Subject to Static Overpressurization - Joe R. Weatherby, Sandia
- 6. ' Containment Penetrations - Walt Von Riesemann,- Dav'e Clauss 7.
Testing and Analysis of Operable Penetrations - D. B. Clauss 8.
Slides - The Seismic Category I Structures Program - J. G. Bennett Los Alamos National Laboratory