ARCHIVESHISTORIQUES
DELACOMMISSION
COLLECTION RELIEEDES
DOCUMENTS "COM"
COM(81)551
Vol.1981/0167

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KOMMISSIONEN FORDEEUROPÆISKE FÆLLESSKABER
KOM(81)551 endelig udg.
Bruxelles -den 1.oktober 1981
OVERENSKOMST MELLEM UNITED STATES NUCLEAR REGULATORY COMMISSION
(USNRC )OGKOMMISSIONEN FOR DEEUROPÆISKE FÆLLESSKABER PAVEGNE
AFDET EUROPÆISKE ATOMENERGIFÆLLESSKAB (EURATOM )OMKERNEINTERN
SIMULERING AFTAB-AF-KØLEMIDDEL -UHELD (LOCA )ILETVANDSREAKTORER
(LWR )
o
(Meddelelse fra Kommissionen til Rådet )
K0M(81 )551endelig udg .

«
VEDR .sOverenskomst mellem United .States Kuclear Regulatory Commission
(USNRC )ogKommissionen forDeeuropæiske Fællesskaber påvegne
af ,Deteuropæiske Atomenergifællesskab (EURATOK )omkerneintern
simulering aftab-af-kølemiddel -uheld (LOCA )iletvandsreaktorer
(LUR ) ,
1.Detfælles Forskningscenters (FFC)flerårige forskningsprogram for
1980-1983 ,somerfastlagt vedRådets afgørelse af13.marts 1980 l)
omfatter Super-SARA projekt et,som skal udføres dEssor-reaktoren
vedanlægget iIspra ,ogsomudgør centrets betydeligste enkeltbi -
drag tilsikkerhedsforskningen vedrørende LWR .Etafdette projekts
hovedmål ervedsimulering ireaktoren (kerne internt )atundersøge
reaktorbrændslets adfærd under betingelser ,somkanopstå vedtab
afkølemiddel .
• r
...Dette omrade afsikkerhedsforskningen vedrørende LV/Rhar ingernatio -
-r--nalt højprioritet ,især efter uheldet påThree Mile Island (TMl )i
USAden 28.marts 1979 «
2.Under Rådets drøftelser iforbindelse medafgørelsen omFFG's nuvæ­
rende flerårige program ,understregedes betydningen afinternatio­
nalt samarbejde omSuper-SARA projektet .Rådet blev pådette tids­
punkt underrettet om,atKommissionen havde indledt forhandlinger
medUSNRC ommulighederne for etsådant samarbejde ,ogatderved •
vurderingen afFællesskabets omkostninger tilprojektet allerede
vartaget hensyn tilUSWRC's bidrag ,somville' blive ydet iform af
materiel 2).
3•Rådet underrettedes omdenpåfølgende udvikling iKommissionens for­
handlinger medUSKRC gennem I98O irapporten fraKommissionen til
Rådet omimplementeringen afførste fase (1980 )iSuper-SARA pro­
jektet 3).Rådet konstaterede vedsinafgørelse omprojektets ,anden
fase (1981-1983 )»atværdien afdetforventede bidrag fraUSKRC i
form afmateriel vartaget ibetragtning vedvurdering afFælles­
skabets udgifter tilprojektet 4).
1)EFTL72af18.3.1980,' s.11. .
2)Rådets dokument 5422/80(ATO31)af4.marts 1980 ,s..3.
3)K0M(80 )750endelig udg .af27.november 1980 ,s.40.
4)Rådets dokument 7107/81(ATO46)af19'.maj1981 ,s.3«

4.Samtidig blev Detrådgivende udvalg forProgramforvaltning "Reak-
torsikkerhed "ogFFC's almindelige rådgivende udvalg holdt orien­
teret omudviklingen iKommissionens forhandlinger med ULiriitC .
Veddicce forhandlinger ermannunået frem tiletaftaleudkast (i
form afenoverenskomst )medbilag ,somkanaccepteres afbegge
parter .Udover atgive regler for detoparters anvendelse afin­
formation ogpatenter (artikel 5)indeholder aftalen følgende ho­
vedpunkter :
-USNRC videregiver relevante oplysninger omdetamerikanske P3F-
eksperiment tilEURATOM (artikel 3)«Densærlige Super-3ARA
gruppe ,somKommissionen nedsatte ijuni 1930 for iteknisk hen­
seende atstøtte Kommissionen veddefinition afSuper-SARA pro­
grammets målogfor atsikre dette projekts sammenkædning med
andre lignende eksperimenter ,fastslog betydningen afPBF-eks -
perimentet idenne sammenhæng ogbehovet for atsikre det supple­
rende /bekræftende forhold mellem disse toprojekter ,især gennem
fælles udnyttelse afinformation 5)5
–USNRC 'sbidrag tilprojektet iform afmateriel fastlægges (bi­
lag 3)påetniveau svarende omtrentlig tilmindst 1,5mio'USD
(1931 )omåret under forudsætning af,atdenamerikanske kongres
årligt bevilger midler tilprojektet .Ialtvilbidraget komme
til atudgøre 4,5mioUSDforårene 1981-1933 under FFC's nu­
værende flerårige program ,eller 10,5 USD over den 7-å.ri ge
periode ,somoverenskomsten omfatter .Fællesskabets omkostninger
tilprojektet anslås (ippriser pr.maj1981 )til54,03 mi'oECU
under FFC's nuværende flerårige program ,eller 107,53 mioEGUfor
den7-årige periode 1980-1937 6).^
6.Overenskomsten giver denramme –"overenskomst mellem United States
Regulatory Commission ogDeteuropæiske Atomenergifællesskab inden
forkernesikkerhedsforskning ",somblev indgået den19.marts 1979 7),
konkret indhold .Ifølge dette skal der ,under forudsætning afat
derindgås særskilte aftaler mellem parterne ,bl.a .implementeres
fælles programmer ogforskningsprojekter samt udveksles information
inden forafgrænsede områder afkernesikkerhedsforskning ,somudføres
dels afUSNRC ,dels afEURATOM viaFFC ,idette tilfælde studier af
brud pådetprimære kølesystem samt studier oganalyser aftab-af -
kølemiddel-uheld afUSNRC ogkerneintern simulering afLOGA afFFC .
7.Implementeringen afdenne overenskomst vil ikke indebære nogen yder­
ligere udgift over FFC's budget .
5)K0:*:(30 )750endelig udg .af27«november 1980 .
6^Rådets dokument 7107/81(ATO46)af19*niaj1931 ,s.2-3«7)Rådets dokument

3.
ν
o.Retsgrundlaget foroverenskomsten er,ETJRATOM-traktatensårti-.
kel101,stk.3,hvoridetfastsættes ,ataftaler,hvisgennem-
vførelseikkekræverRådetsmedvirken,ogsomkanudføresinden
forrammerneafdetpågældendebudget,forhandlesogafsluttes
afKommissionen . ''
9.Kommissionen underretter hermedRådetom,atdenhartilhensigt
atindgåenoverenskomst medUSNRCioverensstemmelse meddeni
EURATOM-trakrtatens artikel101,stk.3»fastsattefremgangsmåde .
Udkastettiloverenskomsten ogbilagervedlagtdennemeddelelse

DRAFT
ARRANGEMENT BETWEEN
THE UNITED STATES NUCLEAR REGULATORY COMMISSION -
(HEREAFTER CALLED USNRC )
AND - ■ ■;
THE' EUROPEAN ATOMIC ENERGY COMMUNITY
(HEREAFTER CALLED EURATOM ) '' '. "
REPRESENTED BYTHE COMMISSION OFTHE EUROPEAN COMMUNITIES "
ON
IH-PILE LWR LOCA SIMULATION ..
1 1' ' . V - •
(
The USNRC and EURATOM consider itwill bemutually benericial to
cooperate inthe field ofreactor safety research .
AstheUSNRC andEURATOM have agreed intheir bilateral general
.arrangement oncooperation inthe field ofnuclear safety research
(hereafter ^called bilateral arrangement ),signed in1979 ,Art .II .5
ofthis bilateral arrangement foresees thepossibility ofcooperative
research projects based onthe facilities owned oroperated byone of
theparties ; - '» -
Asthemultiannual programme 1980-1983 bfthe Joint Research Centre of
theCommission oftheEuropean Communities contains anactivity on
reactor safety towhich this cooperation will directly contribute ;
AstheESSOR reactor ,owned and operated bythe Joint Research Centre ,
together with itsSuper-SARA circuit ,have particular characteristics
ofinterest for the LWR safety research ;
Asthis safety research has complementary characteristics tothe
research work undertaken bytheUSNRC facilities ;
The following technical cooperation will beundertaken .

2.
The contracting parties -agreed asfollows :
ART .1-OBJECT
V '
This arrangement covers the safety research area concerned v/ith LWR
fuel behaviour under loss -of-coolant accident conditions .
The USNRC participates toaCommunity research programme concerning
the experiments intheSuper-SARA circuit oftheESSOR reactor .This
participation concerns the preparation oftheprogramme ,its execution
and theevaluation ofits results .The cooperation has aduration of
7years ,starting January 1.,1981 ,subject tothe provisions ofART .VI
ofthebilateral arrangement ,which reads :"Itisunderstood that the
ability oftheParties tocarry out their obligations issubject tothe
availability ofappropriated funds ."
.
ART .2-FORM OFCOOPERATION . <
The cooperation will beexecuted asforeseen inART .IIofthebilateral
„arrangement and .inparticular inthe following form :
1.The exchange oftechnical information inthe form ofreports ,
experimental data,' computer codes ,correspondence ,newsletters
andoral discussions .. *• ,
2.The organization ofrelevant meetings .
3.Short visits byspecialist teams orindividuals tothefacilities
oftho other Party .
4.Possible temporary assignment ofpersonnel ofoneParty tothe
laboratory orfacilities oftheother Party ,each such assignment ■
tobeconsidered onacase -by-cane 'basis andbethesubject ofa
separata attachment ofstaff agreement between .theParties .
5.Thesupply ofequipment relevant totheexecution oftheresearch
project .

ART .3-LIMITS OFCOOPERATION
The cooperation .will extend totheSuper-SARA programme asdefined
inAnnex Iofthis arrangement . -
1.The USNRC will make available toEURATOM information inthe relevant -
field ofresearch pertinent tothe timely ,successful performance of '
tests inthecurrently proposed 'Super-SARA test ,programme ,which ithas
the right todisclose either initspossession oravailable toit,in
particular therelevant information related tothe USPBF experiment .
2.-EURATOM will make available tothe USNRC the information relevant to
the execution ofthe Super-SARA project .
3.Each Party will promptly transmit and call tothe other Party 's
attention any information onits research results appearing tohave
significant safety implications . •\ ,
ART .4-EXECUTION OFCOOPERATION . '
The general provisions ofART .IVofthebilateral arrangement apply .
"Each Party will designate asAdministrator asenior representative
"tocoordinate itsparticipation inthe overall exchange .Areview
"meeting oftheAdministrators ortheir representatives will be
,rhe-ld atagreed-upon intervals toreview the status ofexchange
"and cooperation established under this Arrangement ,torecommend
"revisions -for improving and developing the cooperation ,and to
"discus ^topics within the scope ofthecooperation .The time ,place
•„"andagenda for such meetings shall beagreed upon inadvance ."
Specific provisions concerning theimplementation ofthescientific -
technical content ofthe present cooperation are given inAnnex II.. ■
». '
ART .5-USE OFINFORMATION AND PATENTS
Theprovisions ofART.V andVII ofthebilateral arrangement apply .

iXClIANGE AND USE OFINFORMATION
1.The Parties support thewidest possible dissemination ofinformation
provided orexchanged under this Arrangement ,subject totheneed
toprotect proprietary information asmay beexchanged hereunder ,and
tothe provisions ofART .VII ,PATENTS .
2.Asused inthis Arrangement ,thefollowing definitions apply :
(i)The term "information "means scientific ortechnical data ,
results ormethods ofresearch and development ,and anyother
information intended tobeprovided orexhanged under this
Arrangement .
(ii)The term "proprietary information "means information which
contains trade secrets orother privileged orconfidential
commercial information ,and may only include information which :
(a)has been held inconfidence byitsowner ;and
(b)isofatype which iscustomarily held inconfidence byits
owner ;and
(c)has not been transmitted bythe transmitting Party toother
entities (including the receiving Party )except onthe basis
/
that itbeheld inconfidence ;and
(d)isnot otherwise available tothe receiving Party from
another source without restriction onits further
dissemination .
3.The Party receiving proprietary information pursuant tothis
Arrangement shall respect the privileged nature thereof ,provided
such proprietary information isclearly marked with the appropriate
legend ofthe transmitting Party and with the following (orsubstantially
similar )restrictive legend :
"This document contains proprietary information furnished in
confidence under anArrangement date r– ketween t"e
United States Nuclear Regulatory Commission andEURATOM and shall
not bedisseminated outside these organizations ,their consultants ,
contractors and licensees ,and concerned departments and agencies of *
the Governments ofthe United States and ofthe member states of
EURATOM without theprior approval of •
This notice shall bemarked onanyreproduction hereof ,inwhole orin
part .These limitations shall automatically terminate when this
information isdisclosed bvthe owner without restriction .

Inregard tothedissemination and use ofproprietary information
received inconfidence under this Arrangement ,the Parties agree that :
(i)Such information may bedisseminated bythereceiving Party to
persons within oremployed bythe receiving Party ,and to ; - '
(a)concerned government departments and government agencies
inthe country ormember states of -the receiving Party ;
>
(b)prime orsub-contractors orconsultants ofthe' receiving
Party located within the geographical limits .ofthe receiving
Party 'scountry ormember states ,for use only within the
framework oftheir contracts with the receiving Party in
work relating tothe subject matter oftheproprietary
information ; '
(c)organizations permitted orlicensed bythe receiving Party in
the field ofdevelopment ,design ,construction and operation
ofnuclear production orutilization facilities for use only
within the terms ofsuch permit orlicense ;
(d)contractors oforganizations identified inItem 4(i)(c)
above for use only within the scope ofthe permit orlicense
granted tosuch organizations ;
provided that any proprietary information sodisseminated under
sub-paragraphs (b),(c)and (d),above shall bepursuant to -an .agreement
ofconfidentiality and shall bemarked with arestrictive legend
substantially identical tothat appearing inparagraph 3'above .
(ii)With theprior written consent ofthe Party providing proprietary
information under this Arrangement ,the receiving Party may
disseminate such proprietary information more widely ,than
otherwise permitted inthe foregoing subsection (i).The Parties
shall cooperate with each other indeveloping procedures for
requesting and obtaining approval for such wider dissemination
and each Party will grant such approval tothe extent permitted
.,byits national policies ,regulations and laws .
(iii )Each Party shall exorcise itsbest efforts toensure that
•proprietary information received byitunder this Arrangement is
controlled asprovided herein .Ifone ofthe Parties becomes
awa*:e that itwill be,ormay reasonably beexpected tobecome .,
unable tomeet the'non-dissomination provisions ofthis Article ,
itshal -immediately inform theother Party .-The Parties shall

6.
thereafter consult todefine anappropriate course ofaction .
(iv)Non-documentary proprietary information provided inseminars
and other meetings organised under this Arrangement ,or
information arising from theattachments ofstaff ,use of
facilities orjoint projects shall betreated bytheParties
inaccordance with theprinciples specified inthis Article ,
provided ,however ,that theParty communicating such proprietary
information places the recipient onnotice astothe character
ofthe information communicated .
(v)Nothing contained inthis Arrangement shall preclude the use
ordissemination ofinformation received byaParty from the
sources outside this Arrangement .
(vi )Information given byone Party totheother under this Arrangement
shall beaccurate tothebest knov /ledge and belief oftheParty
giving it,but neither Party gives anywarranty astothe accuracy
ofsuch information orshall have any responsibility for the
consequences ofany use towhich such information may beput bythe
other Party orby .any third party ." ,
"PATEIl'I 'S
1.Asset forth inthis Article ,"Country "shall betaken tomean ;
(i)The United States ofAmerica for the USNRC Party ;
(ii)The Member States ofEURATOM for the EURATOM Party .
2.With respect toany invention ordiscovery made orconceived inthe
course oforunder this .Arrangement ; . * •
(i)Ifmade orconceived bypersonnel ofone Party (theAssigning
Party )oritscontractors v/hile assigned totheother Party
(Recipient Party )orits contractors ;
(a)The Recipient Party shall acquire all right ,title ,and
interest inand toany such' invention ordiscovery inits
ownCountry and inthird countries ,subject toanon-exclusive ,
irrevocable ,royalty-free license inall such countries tothe
Assigning Party ,with theright togrant sub-licenses ,under any
\
-such invention ordiscovery and anypatent application ,patent or
other orctection relating thereto ,foruse inthe production or
/

utilization ofspecial nuclear ,material oratomic energy ;and
(b)The Assigning Party shall acquire all right ,titl-e ,and
interest inand toany such invention 'ordiscovery initsown
Country ,subject to.anon-exclusive ,irrevocable ,royalty-free
.'license tothe recipient party ,-with the right togrant sub-
licenses under any such invention ordiscovery and any patent
application ,patent orother protection relating thereto for •
use intheproduction orutilization ofspecial nuclear material
oratomic eliery . - •
(ii)Ifmade orconceived bypersonnel other than thepersonnel referred
toinparagraph (i)above ,asaresult ofattendance atmeetings
-orasaresult ofemploying information which had been communicated
under this Arrangement byone Party orits contractors -tothe other
Party orits contractors ,the Party ofsuch personnel making the
invention -shall acquire all .right ,title ,and interest inand to
any such invention ordiscovery inall countries ,subject tothe
grant tothe other Party ofaroyalty-free ,non-exclusive ,irrevocable
license ,;with the right togrant "sub-licenses ,inand toany such
invention ordiscovery and any patent application ,patent orother
protection relating thereto inall countries ,for use inthe J
production orutilization ofspecial nuclear material oratomic
energy . . .
(iii )With regard toother specific forms ofco-operation ,including
loans orexchanges ofmaterials ,instruments and equipment for
special joint research projects ,the Parties shall provide for
appropriate distribution ofrights toinventions ordiscoveries
.resulting from such co-operation ..Ingeneral ,however ,each Party
should normally own the rights tosuch inventions ordiscoveries '
inits own Country with aroyalty-free ,non-exclusive ,irrevocable
license tothe other Party ,and the rights tosuch inventions or
discoveries inother countries should beagreed bythe Parties on
,anequitable basis . ^ '
Neither Party shall discriminate against citizens oftheCountry of
theother Party with respect togranting any license orsub-license
under any invention ordiscovery pursuant toparagraph 1above .

8.
Itisunderstood that thelicensing policies andpractices ofeach
Party maybeaffected because oftherights ofboth Parties togrant
licenses within asingle jurisdiction .Accordingly ,either Party may
request ,inregard toasingle invention ordiscovery orclass of
inventions ordiscoveries ,that the Parties consult inaneffort to
lessen oreliminate anydetrimental effect that theparallel licensing
authorities may have onthepolicies and practices oftheParties .
4.Neither Party will assume theresponsibility topay awards or
compensation required tobepaid tothenationals oftheother Party
according tothe laws ofthe other Country ."
ART .6-COSTS
The USNRC will participate in-kind inthe costs for theprogramme atan
annual level roughly equivalent to1,500,000 US1981 dollars ormore ,
subject tocontinued annual UScongressional funding ofprogramme support
and maintenance ofSST programme content and progress .This participation
will beinthe form ofsupply oftest hardware ,manpower and services as
defined inAnnex III .
ART .7-FINAL PROVISIONS
1.This Arrangement shall enter into force from thedate ofconclusion
thereof , and ,subject toparagraph 2ofthis Article ,shall
remain into force for aperiod of7years ,unless previously extended
byagreement between the Parties .
2.Either Party maywithdraw from thepresent Arrangement after providing
theother Party written notice 1year prior toitsintended date of
withdrawal .
3.The Parties agree that alldiscussions ,meetings ,exchange ofdocuments
orother acts ofcooperation between them andprior tothe entry into
force ofthis Arrangement which ,ifthey hadoccurred subsequent tothe
entry into force ofthis Arrangement ,would have been subject tothis
Arrangement ,shall besubject tothe terms hereof .

9.
FOR THE UNITED STATES
NUCLEAR REGULATORY COMMISSION
BY :
TITLE : ; -
DATE' : 'FOR EURATOM , -
COMMISSION OFTHE EUROPEAN COMMUNITIES
BY : '
TITLE :
DATE :•>■

ANNEX 1
OOTLJNE =QF=THE=SUPiRSARA =TE|T =PROGRAM __
1.General
During 1980 ,aTask Force wasestablished
bytheJoint Research Centre oftheCommission ofthe
European Communities todiscuss and reach aconsensus among the
participants onthe objectives ,test matrix and technological difficulties ,
ofthe SSTP .This consensus was reached inOctober 1980
and theprogram which emerged ,designated asthe "consensus
SSTP ",remains thefoundation ofall on-going work .
The first basic objective ofthe consensus SSTP isthe
attainment ofdata and adeeper generic understanding con­
cerning those aspects ofLWR fuel cluster behaviour which
can lead tosignificant fuel damage ,core blockage and
coolability .problems asaresult of .hypothetical accident
situations .ofalowprobability where normal safeguard sy­
stems are assumed tdbepartially orwholly in-operative .
Inaddition tosuch anunderstanding ofthe thermo -
mechar.ical ar.d themchydraul 1csprocesses governing LWR
fuel cluster damage andblockage ,asecond basic objective
isthe correlation ofthe transient fission product release
(FFR )occur :ngduring accident situations with thetype and
extent ofthe fuel damage provoked . •
The consensus SSTP covers fuel cluster behaviour both
for thetransient ■conditions ofthe "large break "loss-of -

2-
coolant-accident (LB-LOCA )and thetransient conditions' of
other accident scenarios which tinder certain circumstances
could lead toperiods ofpartial core uncovery andhigher'
clad temperatures and apotential forsevere fuel damage
.(SFD).Animportant example ofsuch atransient leading to
SFD isprovided bytheThree Mile Island (TMl )accident .
Itisunderstood that more emphasis should beplaced
onthe SFD part oftheprogram .than .,ontheLB-LOCA >part .
The reason for this isessentially that ,while aconsiderable -
amount ofwork hasbeen started orcompleted for theLB-LOCA ,
activities inthe SFDfield arerelatively behind andrequire
intensification .
LB-LOCA test program
•The LB-LOCA part of -theconsensus SSTP has been establi­
shed onthebasis that ismust beconfirmatory with respect
tothecurrent out-of-pile L3-L0CA fuel -behaviour programs
such asEEBEKA attheKfKKarlsruhe (which areable to
scope well the governing parameters andrequire only li­
mited m-pile chec. 'stoconfirm the typicality ofrod-
simulators performar.ee ) .andcomplementary with respect to
■thecurrent m-pile LB-LOCA programs .such asPBFatINEL-
Idaho andPHEBUS atCadarache ,France (where thedata
available orexpected should bebacked upbyin-pile tests
which give something new);
-The SUPESSAP.A loop isbeing fabricated with thedesign
aim to'simulate the entire LB-LOCA scenario ,blowdown to
reflood ,by "means ofcontrol actions onvalves and cluster
power .This capability will beexploited inorder tomeet •
thebasic objectives stated above ,which ,for theLB-LOCA v
V /•••/•••

-3-
takeonthefollowingparticular form:
-Claddeformationcharacteristics ,likelytobe
dominatedbyhighstrain–rateballooning ,influencing
thedegreeofclusterblockage.
-Interactions causedbydeforrnationswhichmight
influencetheclusterblockagefraction.
-Rodclustercoolability andthermalresponseduring
refloodmg. s
-Dependence-.of FPRontheextentofclusterdamage.
Theconsensus LB-LOCAtestmatrixwhich
fitswithintherequiredconfirmatory/complementary contextis
coveredbythefollowingtests:
-4Testswith2mlongPWR(type17x17)clustersof32
rods;
-1testwitha2mlongBWR-typecluster(probablytype
-8x82);
-2unspecified teststocoverunforeseenrequirements
ofhighpriorityarisingatalaterstage.
3.CoreunccveryandSFDtestprogram
Incontrasttot:ieLB-LOCApart,theSFDpartofthe
consensus SST?seekstogenerateamorecomprehensive range
ofdata.Thereisr.oncurrentlythewidevarietyofactivity
forSFDasfortheLB-LOCAfield:theonlyotherknown
comparable SFDprogramisthatplannedfortheP3FatINEL
-Idaho,startingin1982..ThePHEBUSprogram -mayalso
proposeSFDtests,mwhichcasethesewillalsohavetobe
considered .Forthetmebeing,theSSTPhastoensurea
•••/•4•

-4-\
good complementary /confirmatory relati onship only with the
PBFprogram .
Considering thebasic objectives stated above and the
large array ofaccident scenari oswhich maypotentially lead
toSFD ,asoccurred mthecase oftheTMI accident ,"the
SUPERSARA loop has thedesign aim tosimulate theessential
common feature ofall the SFD scenarios :cluster boildown
anduncovery .toprovoke relevant transient ofclad
temperature incombination with relevant transients of
■system pressure ,followed byre-submergence andquenching .
This capability will beused toaddress thefollowing
particular SFDobjectives .
A)Degree ofcluster blockage andFPRdue toclad defor - -
mation andrupture atthelow strain-rates possible in
"core uncovery "transients ,especially considering the
effects ofclad oxidation onsuch deformation inthe
high <><-high^range (ro1100-1650K).
B)Degree ofcluster blockage andFPRresulting from the-'
formation ofarubble bed due tothewidespread oxida­
tion oftherods (upto^1900X ),with orwithout prior
ballooning andrupture ,followed byrod fragmentation ~
either byquer.cnmg (re-submergence )orsystem depres­
surisation .
C)Degree ofcluster blockage andFPRresulting from the
-formation ofaZr/uo^liquid solution above 2070K
(rod "candling ")inthepresence ofwidespread rod
oxidation ,•vitn crwithout subsequent rubble bed ' -
provocation byquenching . .
The consensus SFD test matrix which
fits within therequired complementary /confirmation relation
with PBF ,will beattained bymeans ofthefollowing tests :
•••/••m

-5-
-3tests with objective (A),allwith 2nloi.g PT.7Rtype
clusters of32rods ;
-4tests w:thobject ive (B),3with 2mlo..g PWR type
clusters of32rods ,1with a2mlo.g BWR type cluste
-5tests with objective (c),4with 2mlo.-g PVRtype
clusters of32rods ,1with a2mlo.ig BWR type cluste
-2unspecif led tests topermit the inclusion ofunfore
seen objectives which may later become ofh:ghprioritype
cluster ;
type
cluster ;
unfore -
priority .

TABLE1:SSTPLARGEBREAKLOCATESTMATRIX
I
TESTN°<
INTENTIONSCLUSTER
·;TYPECLADDEFORMATION
CONDITIONSFUEL COMMENTS
LB-1INVESTIGATE CLAD :
DEFORMATION INΒPHASEIN
"HEATBEFORELOAD".
CONDITIONSPWR(*)HEAT-BEFORE-LO AD;
DEFORMATION
AT~1300KFRESH
PRECONDITIONED
COMPLEMENTARY TO
PHEBUS,PBF,NRU ·
LB-2HIGHPOTENTIAL FORCLAÖ
DEFORMATION (HIGH<X);
"HEATBEFORELOAD"
CONDITIONSPWR(*)HEAT-BEFORE-LOAD;
DEFORMATION
AT1070ΚFRESH
PRECONDITIONED
LB-3ASTESTLB-2BUT
DEFORMATION IN"LOAD
BEFOREHEAT"CONDITIONSPWR(*)LOAD-BEFORE-HEAT;
DEFORMATION
AT1070K :VFRESH
PRECONDITIONEDCONFIRMS
REBEKA,MRBTF
COMPLEMENTARY TO
NRULB-4ASTESTLB-3BUT
INVESTIGATE EFFECTOFFUEL
BURN-UPI.E.FUEL·CRACKING ,
RELOCATION ETC.PWR(*)LOAD-BEFORE-'ΈAT;
DEFORMATION '
AT^1070KSOME
IRRADIATED :
RODS ,/
LB-5ASTESTLB-3BUT
CONFIRMEXTRAPOLATION OF
PWRTEST·RESULTSTOOTHER
FUELGEOMETRIES VBRW(**)LOAD-BEFORE-HEAT;
DEFORMATION
AT1070KFRESH
PRECONDITIONED
,»COÍÍPLEMENTARYTO
PHEBUS,PBF,NUR,
REBEKA,MRBTF
LB-6
LB-72UNSPECIFIED TESTSTOPERMITTESTINGOFREMEDIALMEASURESORANYOTHERSTUDYLATERENTIRING ·
HIGHPRIORITY
(*)17x77TYPEGEOMETRY
'(**)PROBABLY8x8TYPEGEOMETRY

TABLE2:SSTPCOREUNCOVERY/SEVEREFUELDAMAGETESTMATRIX
TESTSERIESA:INVESTIGATION OFEXTENTOFCLUSTER BLOCKAGE ANDFISSION PRODUCTRELEASE
DUETOCLADDEFORMATION UNDER"SMALLANDMEDIUMBREAK"'CONDITIONS
COMPLEMENTARY TOPBF.
TESTΝ°CLUSTER
TYPE INTENTION TESTTERMINATION/FINALCONDITIONS
SFD–A–1PWR(*)CLUSTERUNCOVERY TOTCLAD <χ,1080-
1200K,THENCLADLOADINGAND
BALLOONING BYSLOWPRESSURE RAMP
ΔΡCLAD–0.005MPa/SCLUSTER RE-SUBMERGED AFTERWIDESPREAD
CLADRUPTURE
SFD–A-2PWR(*)ASSFD–A–1BUTWITHTCLAD^1350KAND
ΔΡCLADAD.TESTED INRANGE0.005-0.05
MPa/STOGETDESIREDOXIDATION DURING
BALLOONINGCLUSTER RE–SUBMERGED AFTERWIDESPREAD
CLADRUPTURE
SFD-A-3PWR(*)ASSFD–A–2BUTWITHTCLAD 1650KCLUSTER RE-SUBMERGED AFTERWIDESPREAD
CLADRUPTURE
*17X17TYPEGEOMETRY
w

A '
-«ir 1 "*
TABLE2(CONT.):SSTPCOREUNCOVERY/SEVEREFUELDAMAGETESTMATRIX
TESTSERIESB:INVESTIGATION OFEXTENTOFCLUSTERBLOCKAGE ANDFISSIONRPODUCTRET,EASE
WITHNOMOLTENCOMPONENT DUETORODFRAGMENTATION ANDRUBBLEBEDFORMATION ;
COMPLEMENTARY TOPBF
TESTN°CLUSTER
TYPEINTENTION TESTTERMINATION/FINALCONDITIONS
SFD-B-1PWR(*)
1CLUSTERUÑCOVERYTOTCLAD 1900KAT
ARATE-ν0.3K/sTOFROVOKECLAD
RUPTUREAT'ν11OOKFOLLOWED WIDESPREAD
CLADOXIDATION ANDEMBRITTLE MENT.
PSYS/N>8MPaSLOWCOOL-DOWN TOAVOIDROD
FRAGMENTATION ANDRUBBLEBED:
DO
SFD-B-2PWR(*) ASSFD-B-1FASTCOOL-DOWN TOPROVOKE ROD
FRAGMENTATION ANDRUBBLEBEDFORMATION
"/ ·
SFD-B-3■PWR(*)-ASSFD-B-1BUTWITHCLADRUPTURE
OCCURINGATC^1650K''*
ASSFD-B-2 .
SFD-B-3BWR(**)CLUSTERUNCOVERY TOTCLAD 1500KWITH
NORUPTURE'06PCLAD<0);WIDESPREAD -
CLADOXIDATION AT1^OOK;SLOWCOOL-
DOWNTOTCLAD~600K.PSYS-^4MPa .PSYSDROPPEDFROM4TOlMPaTO.PROVOKE '
CLADSHATTERING FORTCLAD~60OK.SLOW
COQL–DOWNCONTINUED TOAVOIDFURTHER
RODFRAGMENTATION :'
*17X17TYPEGEOMETRY
**PROBABLY .8x8TYPEGEOMETRY

TABLE2(CONT.)SSTFCOREUNCOVERY/SEVEREFUELDAMAGETESTMATRIX
TESTSERIESC:INVESTIGATION OFEXTENTOFCLUSTERBLOCKAGE DUETOFORMATION OFA
MOLTENSOLUTIONOFU02INZIRCALLOY (ROD"CANDLING "),POSSIBLY '
FOLLOWED BYQUENCH •INDUCEDRUBBLEBED;PWRTESTSCONFIRMATORY TO
PBF,BWRTESTCOMPLEMENTARY
TESTΝ°CLUSTER
TYPEINTENTION TESTTERMINATION/FINALCONDITIONS
SFD-C-1PWR(*) ·■'CLUSTER UNCOVERY TOTCLAD~2300KAT
ARATE~4K/STOPROVOKECLADRUPTURE
AT-1100ΚFOLLOWED BYCLADOXIDATION ,
MELTINGANDDISSOLUTION OFU02
(CANDLING)TOFORMFROZENSLAGAT
COOLERELEVATIONS .PSYS**8.MPaSLOWCOOL-DOWN TOAVOIDRUBBLEBEDDUE
TOFRAGMENTATION OFRODSANDSLAG
SFD-C-2PV/R(*) ASSFD-C-1 FASTCOOL-DOWN TOPROVOKERUBBLEBED
DUE,T0RODANDSLAGFRAGMENTATION
SFD-C-3PWR(*) ASSFD-C-1BUTWITHCLADRUPTURE
OCCURING AT^1650ΚASSFD-C-2
)
SFD-C-4PWR(*)ASSFD-C-1BUTWITHFASTERUNCOVERY
TOSIGNIFICANTLY EXCEED4K/sTCLAD
RAMPTOINVESTIGATE MOREEXTENSIVE
CLADMELTINGASSFD-C-2
SFD–C–5BWR(**)ASSFD-C-1BUTWITHÄPCLAD<υTOGET
CLADCREEP-DOWN INSTEAD OFRUPTURE^
POTENTIAL FORMORECLADMELTING AND
ASSESSMENT OFBWRSUBASSEMBLY MELT-
THROUGH
1ASSFD-C-1
*17X17TYPEGEOMETRY
**PROBABLY 8X8RTYPEGEOMETRY

TABLE2(CONT.):SSTPCORfrUNCOVERYSEVEREFUELDAMAGETESTMATRIX .
TESTSERIESD:UNSPECIFIED TESTS >
TESTN°SFD–D–1:)2UNSPECIFIED TESTSTO'^URMITSTUDIESLATERENTERINGHIGHPRIORITY,
TESTN°SFD–D–2:)CURRENTLY UNFORSEEN 1

■ÎA
ANNEy.II
Dilaterai Tcchnical ImDlGinentation Cominittee
The contractiong Parties hereby set upaBilateral Technical
Implementation Committee toassure the execution ofthe
co-operation provided for inthis Arrangement .
Each Party will designate itsmembers tothis Bilateral
Committee ana may further designate atechnical spokesman .
The Committee shall meet atleast annually toreview SSTprogramme
progress and the effectiveness ofthe cooperative programme effort .
The output from these meetings will beused bytheNRC asapart
/
ofits annual internal review ofthe SST programme progress and
its continued applicability tocurrent NRC programme objectives .

■ii
ANNEX III
The basic USNRC in-kind contribution shall beatanannual level roughly '
equivalent to1,500,000 US1981 dollars ormore ,(subject tocontinued
annual UScongressional funding ofprogramme support andmaintenance of
SSTprogramme content andprogress )asdefined inART .6ofthe'Arrangement .
The form ofthe UScontribution ,listed inorder ofpriority ,shall be :
1.NRC basic supply of3test trains including all precalculations ,R&D ,,
operational data ,safety analyses ,QA-QC results ,inaddition tothe
test train hardware and components fortests and schedules equivalent
toorbetter than SFDA-1 ,SFDB-1 and SFDC-1 ofthe currently planned
SSTprogramme ,subject toUScash flow limitations .
2.Long term assignments providing liaison with PNL toassist Jspra in :
2.1 .harmonizing with USprecalculations and test operational specifications ;
2.2 .harmonizing with USdesign and analysis ofSFD-TT 's;
2.3 .assembly ofSFD-TT 'satIspra ; ^
•2.4 .SFD test feasibility and safety assessment ;
2.5 .co-ordination ofPBF test experiment and results (e.g. shroud
performance )into Super-SARA planning .
3.Short term assignments providing :
3.1 .assistance with loop commissioning activities ;
3.2 .specification anddevelopment ofspecial software for data
acquisition system andprogramme monitoring system ; ■ '
3.3 .assistance incalibration and application ofthe transient thermo -
i"hydraulic instrumentation ;
3.4 .assistance indesign ,testing andapplication ofthetransient rod system
3.5 .assistance inthe fission product release (FPR )field ,with aview to
attaining optimal specifications for the Super-SARA FPR monitoring
system inthe light ofUSexperience with similar equipment .
4.Sùpporting services inthe US :
4.1Vspecial analyses ,defined andrequested byIspra andagreed 'toBy
NRC ,tosupport ; '
4.2 .back-up foritem 2abovej
4.2.1 .safety assessment ;
4.2.2 .test precalculations performed byIspra .

2.
5.Supply ofspecial components forremaining test trains :
5.1 .advanced instrumentation ,e.g .:
5.1.1 .fused alloy high temperature sensors ;
5.1.2 .mixture level sensors ;
5.1.3 .11shrouds .
The annual NRC level ofSSTP support effort for the several listed
activities ,isestimated asfollows :
item 2:one man per year for 5years ;
item 3:eight man months per year for 3years ;
item 4:seven man years .
The USNRC notes that atthe minimum level ofin-kind contribution of
dir .1.5m/year .there ishigh risk that delivery ofthe three test trains
may not betimely .NRC budget projections donot allow for initial annual
in-kind contributions ofmore than dir .1.5m thus ,the priority schedule
may need periodic examination and revision toreflect these limitations .
The NRC notes further that total funding will probably not cover more
than asmall part ofthe item 5priorities ,e.g. the 11shrouds initem
5.1.3 .probably cannot beprovided ,either inatimely fashion or
within the available annual NRC funding levels .