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

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(JOL243du27.9.2003,p.1),cedossierestouvertaupublic.Lecaséchéant,lesdocuments
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règlement.
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concerningtheopeningtothepublicofthehistoricalarchivesoftheEuropeanEconomic
Community andtheEuropeanAtomicEnergyCommunity (OJL43,15.2.1983,p.1),as
amendedbyRegulation(EC,Euratom)No1700/2003of22September2003(OJL243,
27.9.2003,p.1),thisfileisopentothepublic.Wherenecessary,classifieddocuments inthis
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Wirtschaftsgemeinschaft undderEuropäischen Atomgemeinschaft (ABI.L43vom15.2.1983,
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COMMISSIONE DELLECOMUNITÀ EUROPEE
COM(81)551 def.
Bruxelles.1ottobre1981
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■
L'';'
ACCORDOTRALAUSNRC(UNITEDSTATESNUCLEARREGULATORY COMMISSIONI )
ELACOMMISSIONE DELLECOMUNITÀ' EUROPEE CHERAPPRESENTA LACOMU­
NITÀ'EUROPEADELL'ENERGIAATOMICA(EURATOM)?SULLASIMULAZIONE DI
INCIDENTI DIPERDITADIREFRIGERANTE (LOCA)INREATTORI ADACQUA
LEGGERA(LWR)
(Comunicazione dellaCommissione alConsiglio)
COM(81)551def

-2-
4.Contemporaneamente ,siailcomitatoconsultivoinmateriadigestione
delprogramma"Sicurezzadeireattori"cheilcomitatoconsultivogeneraledel
CCRsonostatitenutiinformatidìtuttiglisviluppidelletrattative
tralaCommissione el'USNRC.
5.Inegoziatisisonoconclusiconlastesuradiuntestodiprogetto
,d'accordo(sottoformadiaccordo),ediallegatiaccettabili perambo
leparti.Oltreadisciplinarel'usodelleinformazioni edeibrevetti
tra-ledueparti(art.5),l'accordoècaratterizzato daaltridue.ele­
mentimoltoimportanti : ~
\.-L'USNRCmetteràadisposizionedell'Euratomleinformazioni riguardan­
til'esperimento USPBF(art.3).LataskforceSuper-SARA,costituita
dallaCommissionenelgiugno1980perfornireunsupportotecnicoal­
laCommissionenelladefiniziónedegliobiettividelprogramma-
Super-SARA eperassicurareilcoltegamento ,diquestoprogettoconaltri
.esperimenti connessi,hariconosciutol'importanzadellericerchePBF
inquestocontestoelanecessitàdigarantireilcaratterejcomplemen-.
tareedireciprocaconfermadeidueprogetti,inparticolareattraver­
solamessaincomuneideileinformazioni (5).
-L'USNRCdefinisceilcontributo innaturacheintendefornireannual-_J
mentealprogetto(allegato3),perun.importoequivalente anonmeno
di1,5milionidiUSD(1981)conriservadiapprovazione annualedel
■•finanziamento dapartedelCongresso.Ciòrappresenterebbe uncontri->
butodi4,5milionidiUSDperilperiodo1981-1983dell'attualepro­
•;grammapluriennaledelCCRedi:10,5milionidiUSDperisetteanni
•copertidall'accoppo.Ilprevistocontributocomunitarioalprogettò
(aiprezzidimaggio1981)èdi54,03milionidiECUneitreannidel-.,l'attualeprogrammadelCCRedi107,53milionidiECUnelsettennio
1980-1986(6).*;. ■
-L'accordoprevedelaconsultazione dell'USNRCnell'ambitodidetta
cooperazione .
6.L'accordocostituiscel'espressioneconcretadell'accordoquadrointito­
lato"AccordotralaUSRNCelaComunitàeuropeadell'energiaatomicanel
settoredellaricercasullasicurezzanucleare"conclusoil19mar­
-'.zo-1979(7).Quest'ùltimoprevedetral'altro,previastipulazione di
accordidistintitr«)leparti,l'esecuzionediprogrammicomuniedipro­
gettidicollaboraz*ione nonchéloscambiodiinformazioni indeterminati
settoridellaricercasullasicurezzanuclearesvoltadall'USNRCodal­
l'EuratomtramiteilCCR,eprecisamente glistudisullarotturadelsi­
stemadiraffreddamento primario,glistudieleanalisidegliincidenti
<diperditadirefrigerante (USRNC)elasimulazionein-piladiunLOCA(CCR).
>' , *.>■'
7.L'attuazionedidettoaccordononcomporteràspesesupplementari peril
^bilancioCCR. .
■<. > 'y
(5)C0M(80)750def.del27.11.1980.
(ó)DocumentodelConsiglio7107/81(AT046)del19.5.19$1,pagg.2e3.
(7)DocumentodelConsiglio '
ι ·, ;I · .

Oggetto:AccordotraLaUSNRC(UnitedStatesNucLearRegulatory Commission )
elaCommissione delleComunitàeuropeecherappresenta laComuni­
tàeuropeadel.lJenergiaatomica(Euratom),sullasimulazione di
incidentidi^efditadirefrigerante (LOCA)inreattoriadacqua
leggera(LWR)
1.L'attualeprogrammadjricercapluriennale 1980-1983delCentrocomune
diricerca(CCR),decisodalConsiglioil13marzo1980(1),includeil
progetto .Super-SARA *chesaràrealizzato nelreattore ESSORpressolo
stabilimento diIspiaechecostituisceilpiùimportante contributo di
questostabilimento allaricercasullasicurezzadeireattoriadacqua
leggera(LWR).Unocieiprincipaliobiettividiquestoprogetto èdistu­
diare/mediantesimulazione nelreattore(in-pila),ilcomportamento del
combustibile incasodiincidente conperditadirefrigerante .
QuestosettoredèliaricercasullasicurezzadegliLWRèdiventatoprio­
ritarioalivellointernazionale inparticolare dopol'incidente avvenu­
tonelreattorediThreeMileIsland(TMI)negliStatiUnitiil28mar­
zo1979.
2.Nelcorsodellediscussioni sfociatenelladecisionesull'attualeprò-<
grammapluriennale delCCR/ilConsiglio hasottolineatol'importanza
diunacollaborazione internazionale sul'progettoSuper-SARA .Almomen­
todelladecisioneilConsiglioerastatoinformato chelaCommissione
negoziava conl'USNftCl'eventualità diunatalecooperazione echesi
eratenutocontodej.contributoinnaturadell'organismostatunitense
,allattodivalutar ^»ilcostodelprogettoperlaComunità(2).
» 1
3.Nel1980ilConsiglio èstatoinformatodellosvilupposuccessivodei
negoziatitralaCommissione el'USNRCnellacomunicazione .dellaCommis­
sionealConsiglio$ull'esecuzionedellaprimafase(1980)delprogetto
Super-SARA (3).Neldeciderelasecondafase(1981-1983)ilConsiglio ha
nuovamenteconstata^chesieratenutocontodell'attesocontributoin
natura,dell'USNRCall'attodivalutareilcostodelprogettoperlaCo­
munità(4).
•••/•••
(1)GU272del18.3.1980,pag.11.
(2)DocumentodelConsiglio5422/80(AT031)del4.3.1980,pag.3.
(3)C0M(80)750 def.del27.11.1980,pag.40.
(4)DocumentodelConsioUo7107/81(AT046)del19.5.1981,pag.3.

-3-
i1',.
8.Labasegiuridicadell'accordoèl'articolo101(3)deltrattato
Euratominc.uisispecifica chegliaccordilacuiesecuzione nei
limitidelbilancioassegnato nonrichiedel'intervento delCon­
siglio-sono'aegoziati econclusiunicamentedallaCommissione .
*
9.LaCommissione informailConsigliodellesueintenzioni diconclu­
dereunaccordoconl'USRNCconformemente allaproceduraprevista
all'articolo101(3)deltrattatoEuratom.Ilprogettod'accordo
eirelativiallegatisonoacclusiallapresentecomunicazione .

Con(fi )5*4 .
DRAFT
ARRANGEMENT BETWEEN
THE UNITED STATES NUCLEAR REGULATORY COMMISSION
(HEREAFTER CALLED USNRC )
AND ' 1. '.. * •' '
THE EUROPEAN ATOMIC ENERGY COMMUNITY
(HEREAFTER CALLED EURATOM ) "
REPRESENTED BYTHE COMMISSION OFTHE EUROPEAN COMMUNITIES .
ON N •
' * -, ; - .
IN-PILELWRLOCA SIMULATION ' -
The USNRC and EURATOM consider it;will bemutually beneficial to
cooperate inthe field ofreactor safety research -
AstheUSNRC and EURATOM have agreed intheir bilateral general
arrangement oncooperation inthe field ofnuclear safety research
(hereafter called bilateral arrangement ),signed in1979 ,Art .II.5
ofthis hilateral arrangement foresees thepossibility -ofcooperative
research projects based' onthe facilities owned oroperated byone of .
theparties ; . * .'
Asthemultiannual programme 1980-1983 ofthe Joint Research Centre of
theCommission oftheEuropean Communities contains anactivity on '
'reactor safety towhich this cooperation will directly contribute ; ,
AstheESSOR reactor ,owned and operated bytheJoint Research Centre ,
,together with its Super-SARA circuit ,have particular characteristics
ofinterest for the LWR safety research ; _
Asthis safety research hascomplementary characteristics tothe
research work undertaken bytheUSNRC facilities ;
The following technical cooperation will beundertaken .

2.
Tne contracting parties -agreed asfollows ;
<
ART .1-OHJECT '
This arrangement ,covers the safety research area concerned with I.VJR
fuel behaviour under loss -of-coolant accident conditions .
The ,USNRC participates toaCommunity research programme concerning
the experiments inthe Super-SARA circuit ofthe ESSOR reactor .This
participation concerns the preparation ofthe programme ,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
Thecooperation will be .executed asforeseen inART .IIofthebilateral
arrangement and inparticular inthe following form :
1.The exchange oftechnical information inthe form ofreports ,
experimental data ,computer codes ,correspondence ,newsletters
and oral discussions .
2.The organization ofrelevant meetings .
(
3.Short visits byspecialist teams orindividuals tothefacilities
ofthe other Party . ■ 't '
4.Possible temporary assignment ofpersonnel ofoneParty tothe
laboratory orfacilities oftheother Party ,each such assignment
tobeconsidered onacase -by-ca: ->ebasis andbethesubject ofa
separate attachment ofstaff agreement between theParties .
5.Thesupply ofequipment relevant totheexecution oftheresearch
project .
./.

ART .3-LIMITS OFCOOPERATION
Thecooperation will extend totheSuper-SARA programme asdefined
inAnnex Iofthis arrangement .
1.The USNRC will make available toEURATOM information inthe relevant
field ofresearch pertinent tothetimely ,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 USPBFexperiment .
2.EURATOM will make available tothe USNRC the information relevant to
the execution ofthe Super-SARA project . ,
3.Each Party will promptly transmit andcall totheother Party 's
.attention anyinformation onitsresearch 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 intheoverall exchange .Areview
"meeting oftheAdministrators or'their representatives will be
"held atagreed-upon intervals toreview the status ofexchange
"and cooperation established under this Arrangement ,torecommend
"revisions for improving and developing the cooperation ,and to
"discuss topics within the scope ofthe cooperation .The time ,place
"and agenda for su'ch meetings shall beagreed upon inadvance ."
Specific provisions concerning the implementation ofthe scientific -
technical content ofthe present cooperation are given inAnnex II,
ART .5-USE OFINFORMATION AND PATENTS
The provisions ofART .Vand VII ofthe -bilateral arrangement apply .

4.
KXCHANGE 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 anddevelopment ,andanyother
information intended tobeprovided orexhanged under this
Arrangement .
(ii)The term "proprietary information "means information which
contains trade secrets orother privileged orconfidential
commercial information ,-andmay only include information which :.
(a)has been held inconfidence byitsowner ;and
(b)isofatype which iscustomarily held inconfidence byits
owner ;and
(c)has notbeen transmitted bythe transmitting Party toother
entities (including the receiving Party )except onthebasis
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 andwith thefollowing (orsubstantially
similar )^restrictive legend : . .
"This document contains proprietary information furnished in
vconfidence under anArrangement date ' between.the
United States Nuclear Regulatory Commission andEURATOM and shall
not bedisseminated outside these organizations ,their consultants ,
contractors and licensees ,and concerned departments and agencies of
theGovernments oftheUnited States andofthemember 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 bytheowner without restriction ..

Inregard tothedissemination and use ofproprietary information
received inconfidence under -this Arrangement ;,the Parties ,^agrce 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 ofthe receiving Party ;
(b)prime orsub-contractors orconsultants ofthe receiving
Party located within the geographical limits ofthe receiving
I
Party scountry ormember states ,for use only within the
framework oftheir contracts with thereceiving 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 or -license ;'
(d)contractors oforganizations identified "inItem 4(i)(c)
above for use only within the scope ofthepermit orlicense
granted tosuch organizations ;
provided that any proprietary information sodisseminated under
sub-paragraphs (b),(c)and (d),above shall ,bepursuant toan-agreenient
ofconfidentiality and shall bemarked with arestrictive legend
substantially identical to-that appearing inparagraph 3above .
(ii)Kith theprior written consent oftheParty 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 coop'erate with each other indeveloping procedures for
requesting andobtaining approval f.orsuch wider dissemination
and each Party will grant such approval tothe extent -permitted
byitsnational policies ,regulations and laws .
(iii )Each Party shall exercise itsbest efforts toensure that
"proprietary information received byitunder this Arrangement is
*controlled asprovided herein .Ifone ofthe Parties becomes
aware that itv/ili be,ormay reasonably beexpected tobeccis ,
unable tomeet the non-dissomination provisions ofthis Article ,
itshal Iimmediately inform theother Party .TheParties shall

thereafter consult "todefine anappropriate course ofaction .-
(iv)Non-documentary proprietary information provided inseminars
andother meetings organised under this Arrangement ,or
information arising from theattachments ofstaff ,useof
facilities orjoint projects shall betreated bytheParties
inaccordance with theprinciples specified inthis Article ,
provided ,however ,that theParty communicating such proprietary
information places the recipient onnotice astothecharacter
_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 tothe best knowledge and belief of .theParty
giving it,but neither Party gives any warranty astothe accuracy
ofsuch information orshall have anyresponsibility for the
consequences ofany use towhich such information may beput bythe
other Party orbyany third party .11
"PATENTS
1.Asset forth inthis Article ,Country shall betaken tomean ;
(i)The United States of .America forthe 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 while 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 orotection relating thereto ,for use intheproduction or

7. v
utilization ofspecial nuclear material oratomic energy ;.and
(b)The Assigning Party shall acquire all right ,title ,and
interest inand toany such invention ordiscovery inits own
Country ,subject toanon-exclusive ,irrevocable ,royalty-free
license totherecipient party ,with the right togrant sub- .
licenses under any such invention ordiscovery and anypatent
application ,patent' orother protection relating thereto *for
use inthe production orutilization ofspecial nuclear material
oratomic enery . '_
(ii)Ifmade orconceived bypersonnel other than thepersonnel referred
toinparagraph (i)above ,asaresult ofattendance atmeetings 1
,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
production orutilisation ofspecial nuclear material oratomic
energy . -
(iii )With regard toother specific forms ofcq-operation ,including
loans orexchanges ofmaterials ^,instruments andequipment 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 therights 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 bytheParties on
anequitable basis ^*
Neither Party shall discriminate against citizens oftheCountry of -
the other Party with respect togranting any license orsub-license "
under any invention ordiscoverv 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 onthe policies and practices ofthe Parties .
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 the programme 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 theParties .
2.Either Party may withdraw 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 totheterms hereof .

/9.
FOR THE UNITED STATES
NUCLEAR REGULATORY' COMMISSION
BY :
TITLE :FOR EURATOM
COMMISSION OFTHE EUROPEAN COMMUNITIES
BY :
TITLE :
DATE DATE

ANNEX 1
gy|L|NE_gF_THE_SyPERSARA_TEST_PRqGRAM ISSTPJ .
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 ofallon-going work .
The first basic objective oftheconsensus SSTP isthe
attainment ofdata and adeeper generic understanding con­
cerning those aspects ofLWR fuel cluster behaviour which
canlead tosignificant fuel damage ,core blockage and
coolability problems asaresult ofhypothetical accident
situations ofalowprobability where normal safeguard sy­
stems are assumed tobepartially orwholly in-operative .
Inaddition tosuch anunderstanding ofthe thermo -
mechamcal and thermohydraulics processes governing LV7R
fuel cluster damage andblockage ,asecond basic objective
isthe correlation :ofthe transient fission product release
(I?PR )occur :r.gduring 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 -
•••/•••
f

-2-
coolant-accident (LB-LOCA )andthetransient conditions of
'other accident scenarios which tinder certain circumstances
could lead toperiods ofpartial core uncovery ar.dhigher -
clad temperatures and apotential forsevere ,fuel damage
(SFD).Animportant example ofsuch atransient leading to
SFD isprovided bytheThree Mile Island (Till )acqident .
.Itistinder stood that more emphasis should beplaced
onthe SFDpart oftheprogram .than ontheLB-LOCA part .
The reason for this isessentially that ,while aconsiderable
amount ofwotfk hasbeen started orcompleted for theLB-LOCA ,
activities inthe SFDfield arerelatively behind andrequire
intensification . - ~
2.LB-LOCA test program
The LB-LOCA part oftheconsensus SSTP hasbeen establi­
shed onthebasis that ismust beconfirmatory with respect
tothecurrent out-of-pile L3-L0CA fuel behaviour programs
such asREBEKA atthe _KfKKarlsruhe (which areable to
scope well the governing parameters and require only li­
mited' m-pile checks toconfirm the typicality ofrod-
simulators performance )andcomplementary with respect to -
thecurrent m-pile LB-LOCA programs .■such asFBFatINEL-
Idaho andPHEBUS atCadarache ,,France (where thedata
available orexpected should bebacked upbyin-pile tests
■which give something new ).
The SUPE.25A2A loop isbeing fabricated with thedesign
aim .tosimulate' the entire LB-LOCA scenario ,blowdowh to ;
reflood ,bymeans cfcontrol actions onvalves and cluster
power .This capability will beexploited inorder tomeet
thebasic objectives stated above ,which ,for theLB-LOCA
••/••

-3-
take onthefollowing particular form :
.-Clad deformation characteristics ,likely tobe
dominated by.high strain-rate ballooning ,influencing
thedegree ofcluster blockage . * -.
-Interactions caused bydeformations which might
influence thecluster blockage fraction .-
-Rodcluster coolability and thermal response during
refloodmg . >
-Dependence -.ofFPR ontheextent ofcluster damage .
/
The consensus LB-LOCA test matrix which
fits within therequired confirmatory /complementary context is
covered by thefollowing tests :
-'4Tests with 2mlong PWR (type 17x17)clusters of32
rods ;
-1test with a2mlong BVTR-^type cluster (probably type
•8x8R);
-2unspecified tests tocover unforeseen requirements
ofhigh priority arising atalater stage .
3.-Core uncoverv and SPD test program
Incontrast tothe L3-L0CA part ,the SFDpart ofthe .
consensus SST?seeks togenerate amore comprehensive range
ofdata .There isnot currently thewide variety ofactivity
forSFDasfor .theLB-LOCA field :the'only other known
,comparable SFDprogram isthat planned for thePBFatINEL
-Idaho ,starting in1982 .The PHEBUS program may also
propose SFDtests ,inwhich case these will also have tobe
considered .For the tmebeing ,the SSTP has toensure a.
•••/•••

good complementary /confirmatory relati onship only with the
PBFprogram .
Considering thebasic objectives stated above and the
large array of -accident scenarios which may .potentially lead
toSFD ,asoccurred mthecase oftheTMI accident ,the
SUPERSARA loop has thedesign aim tosimulate the essential '
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 ^^snge (<x»1100-1650K).
B)Degree ofcluster blockage andFPRresulting from the ■
•format :onofarubble bed due tothewidespread oxida -
t:on oftherods (upto 1900K ,),with orwithout prior -
ballooning andrupture ,followed byrod fragmentatj on
either byquenching (re-submergence )orsystem depres­
surisation . -
C)Degree ofcluster blockage andFPRresulting from the
formation ofaZr/UO^'liquid solution above~2070K
(rod ■"candling 1')inthe >presence ofwidespread rod
oxidation ,vitn orwithout subsequent rubble bed
provocation byquenching .
The consensus SFD test matrix which
«
fits within therequired comp 1ementary /coafirma tionrelation
with PBF ,will beattained bymeans ofthefollowing tests : . .

-5-
-3testsW3thobjective (A),allwith2mlongPv/2type
clustersof32rods;
-4testsv:thobjective 'B),3with2mlongPV/Rtype
clustersof32rods,1witha2mlo.igB17Rtypecluster;
-5testswithobjective (c),4with2mlo--gPV/Rtype
clustersof32rods,1witha2mlongB\i/Rtypecluster;
-2ur.specifledteststopermittheinclusionofunfore­
seenobjectives whichmaylaterbecomeofh:ghpriority.

TABLE1:SSTPLARGEBREAKLOCATESTMATRIX
I
TESTN°INTENTIONSCLUSTER
TYPE
\CLADDEFORMATION --
CONDITIONSFUEL COMMENTS
LB-1/INVESTIGATE CLAD
DEFORMATION INfiPHASEIN
"HEATBEFORELOAD"
CONDITIONSPWR(*)\
HEAT-BEFORE-LOÀD;
DEFORMATION
AT~1300ΚFRESH ·
PRECONDITIONED
COMPLEMENTARY TO
PHEBUS,PBF,NRU
LB-2HIGHPOTENTIAL FORCLAD
DEFORMATION (HIGH<X);-V
"HEATBEFORELOAD"
CONDITIONSPWR(*)HEAT-BEFORE-LOAD;
DEFORMATION
ATΌ1070KFRESH
PRECONDITIONED
.\ ,<
LB-3ASTESTLB-2BUT
DEFORMATION IN"LOAD
BEFOREHEAT"CONDITIONS»
PWR(*)LOAD-BEFORE-HEAT;
DEFORMATION
AT1070KV
FRESH
PRECONDITIONEDI
C
CONFIRMS
RETBEKA,MRBTF
COMPLEMENTARY TO
NRULB-4ASTESTLB-3BUT
INVESTIGATE EFFECTOFFUEL
BURN-UPI.E.FUELCRACKING ,
RELOCATION ETC.PWR(*)LOAD-BEFORE-"ΈAT;
DEFORMATION
AT^1070KSOME
IRRADIATED
RODS
LB-5ASTESTLB-3BUT
CONFIRMEXTRAPOLATION OF
PWRTESTRESULTSTOOTHER
FUELGEOMETRIES, Ν
ΒRW(**)LOAD-BEFORE-HEAT; 1
DEFORMATION
AT^1070Κ'FRESH
PRECONDITIONED
yCOMPLEMENTARYTO
PHEBUS,PBFFNUR,
REBEKA,MRBTF
LB-6
LB-72UNSPECIFIED TESTSTO'PERMITTESTINGOFREMEDIALMEASURESORANYOTHERSTUDYLATERENTIRING
HIGHPRIORITY ...
(*)17X17TYPEGEOMETRY
(**)■PROBABLY8X8TYPEGEOMETRY

TABLE2:SSTPCOREUNC0VERY/SEVEREFUELDAMAGETESTMATRIX
TESTSERIESA:INVESTIGATION OFEXTENTOFCLUSTERBLOCKAGE ANDFISSIONPRODUCTRELEASE
DUETOCLADDEFORMATION UNDER"SMALLANDMEDIUMBREAK"CONDITIONS
COMPLEMENTARY TOPBF.
TESTN°CLUSTER
TYPE INTENTION TESTTERMINATION/FINALCONDITIONS
SFD–A–1PWR(*)CLUSTER UNCOVERY TOTCLADrv1080-
1200K,THENCLADLOADINGAND'
BALLOONING BYSLOWPRESSURE RAMP
ΔΡCLAD~0.005MPa/SCLUSTERRE-SUBMERGED AFTERWIDESPREAD
CLADRUPTURE
SFD-A-2PWR(*)ASSFD-A-1BUTWITHTCLAD 1350KAND
ΔΡCLADADTESTEDINRANGE0.005-0,05
MPa/STOGETDESIREDOXIDATION DURING
BALLOONINGCLUSTER RE-SUBMERGED AFTERWIDESPREAD
CLADRUPTURE
SFD-A-3PWR(*)ASSFD-A-2BUTWITHTCLAD~1650KCLUSTER RE-SUBMERGED AFTERWIDESPREAD
CLADRUPTURE
*17x17TYPEGEOMETRY

TABLE2(CONT.):SSTPCOREUNCOVERY/SEVEREFUELDAMAGETESTMATRIX
TESTSERIESB:INVESTIGATION OFEXTENTOFCLUSTERBLOCKAGE ANDFISSIONRPODUCT RET,EASE
; WITHNOMOLTENCOMPONENT DUETORODFRAGMENTATION ANDRUBBLEBEDFORMATION :
COMPLEMENTARY TOPBF
TESTN°CLUSTER
TYPEINTENTION ,,/\TESTTERMINATION/FINALCONDITIONS ,
SFD-B-1PWR(*)
\CLUSTERUNCOVERY TOTCLAD 1900KAT
ARATE-ν0.3K/sTOFROVOKECLAD
RUPTUREAT^11OOKFOLLOWED WIDESPREAD
CLADOXIDATION ANDEMBRITTLE MENT.
,PSYS/v8MPaSLOWCOOL-DOWN TOAVOIDROD
FRAGMENTATION ANDRUBBLEBED
SFD-B-2PWR(*) ASSFD-B-1FASTCOOL-DOWN TOPROVOKE ROD
FRAGMENTATION ANDRUBBLEBEDFORMATION
s '
SFD-B-3PWR(*)ASSFD-B-1BUTWITHCLADRUPTURE
OCCURING ATr^l650KASSFD-B-2
SFD-B-3BWR(**)CLUSTERUNCOVERY TOTCLAD~1500KWITH
NORUPTURE(ΔPCLAD<0);WIDESPREAD
CLADOXIDATION AT^1300K;SLOWCOOL-
DOWNTOTCLAD~600K.PSYS~4MPaPSYSDROPPEDFROM4TO1MPaTO.PROVOKE
CLADSHATTERING FORTCLAD~600K.SL0W
COOL–DOWNCONTINUED TOAVOIDFURTHER
RODFRAGMENTATION
*
**17X17TYPEGEOMETRY
PROBABLY8x8TYPEGEOMETRY

,TABLE2(CONT.)SSTFCOREUNCOVERY/SEVEREfUElDAMAGETESTMATRIX
TESTSERIESC:INVESTIGATION OFEXTENTOFCLUSTERBLOCKAGE DUETOFORMATION OFA
MOLTENSOLUTIONOFU02INZIRCALLOY (ROD"CANDLING ")»POSSIBLY
FOLLOWED BYQUENCH•INDUCEDRUBBLEBED;PV/RTESTSCONFIRMATORY TO
PBF,BWRTESTCOMPLEMENTARY
TESTN°CLUSTER '
TYPEINTENTION TESTTERMINATION/FINALCONDITIONS
SFD-C-1<
PV/R(*) CLUSTER UNCOVERY TOTCLAD~2300KAT
A,RATE~4K/sTOPROVOKECLADRUPTURE
AT-1100ΚFOLLOWED BYCLADOXIDATION,
MELTINGANDDISSOLUTION OFUO2
(CANDLING)TOFORMFROZENSLAGAT,
COOLERELEVATIONS .PSYS-v8MPaSLOWCOOL-DOWN TOAVOIDRUBBLEBEDDUE
TOFRAGMENTATION OFRODSANDSLAG
SFD-C-2PWR(*) ASSFD-C-1 FASTCOOL-DOWN TOPROVOKE RUBBLEBED
DUETORODANDSLAGFRAGMENTATION
SFD-C-3PV/R(*).ASSFD-C-1BUTWITHCLADRUPTURE
OCÇURING AT~Ίβ50·ΚASSFD-C-2 - '
SFD-C-1·PWR'(*)ASSFD-C-1BUTWITHFASTERUNCOVERY
TOSIGNIFICANTLY EXCEED4K/sTCLAD
RAMPTOINVESTIGATE MOREEXTENSIVE
CLADMELTINGASSFD-C-2 '.
SFD-C-5BWR(**)ASSFD-C-1BUTWITHÄPCLAD .<υTOGET
CLADCREEP-DOWN INSTEADOFRUPTURE^-
POTENTIAL FORM)RECLADMELTING AND
ASSESSI-TENTOF'BWRSUBASSEMBLY MELT-
THROUGH»
ASSFD-C-1 '
*17X17TYPEGEOMETRY
**PROBABLY8x8RTYPEGEOMETRY

TABLE2,(CONT.):SSTPCOREUNCOVERYSEVEREFUELDAMAGETESTMATRIX
TESTSERIESD:UNSPECIFIED TESTS
TESTN°SFD–D–1:)2UNSPECIFIED TESTSTO™3RMITSTUDIESLATERENTERINGHIGHPRIORITY
TESTN°SFD–D–2:)CURRENTLY UNFORSEEN

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

M
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 .6oftheArrangement .
The form ofthe UScontribution ,listed inorder ofpriority ,shall be :
1.NRCbasic supply of3,test trains including allprecalculations ,'R&D ,
operational data ,safety analyses ,QA-QC results ,inaddition tothe
test train hardware and components -for tests and schedules equivalent
toorbetter than SFDA-1 ,SFDB-1 and SFDC-1 ofthe currently planned
-SST programme ,subject toUScash flow limitations .
2.Long term assignments providing liaison with PNL toassist Ispra 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 and development ofspecial software for data
acquisition system and programme monitoring system ;
3.3."assistance incalibration and application ofthe transient thermo­
hydraulic instrumentation ; - ■" '
3.4 .assistance indesign ,testing and application ofthe transient rod system
3.5 .assistance inthe fission product release (FPR )field ,with avView to .
attaining optimal specifications for the Super-SARA FPR monitoring
system intheiight ofUSexperience with similar equipment . ~
4.Supporting services inthe US : ~
4.1 .special analyses ,defined and requested byIspra ^ndagreed toby
NRC ,tosupport ; ,
4.2 .back-up for it'em 2above ; _ ' - •
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:oneman 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 ,thepriority 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 .