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

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COMMISSION OFTHEEUROPEANCOMMUNITIES
ARRANGEMENT BETWEEN THEUNITEDSTATESNUCLEAR REGULATORY
COMMISSION (USNRC)ANDTHECOMMISSION OFTHEEUROPEAN COMMU
NITIESONBEHALFOFTHEEUROPEAN ATOMICENERGYCOMMUNITY
(EURATOM)ONIN-PILELIGHTWATERREACTOR(LWR)LOSSOF
COOLANTACCIDENT (LOCA)SIMULATION
(Communication fromtheCommissiontotheCouncil)COM(81)551 final
Brussels,1stOctober1981
Λ'
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'V J
i/.;
COM(81)551final

Csrwj
SUBJECT :Communication totheCouncil concerning an .
Arrangement between theUnited States Nuclear Regulatory
.Commission (USNRC )"and theCommission oftheEuropean
Communities onbehalf oftheEuropean Atomic Energy
Community (EURATOM )onIn-Pile Light Water Reactor (LWR )
Loss ofCoolant Accident (LOCA )Simulation .
1.The current .1980-1983 multiannual research programme of .the
Joint Research Centre (JRC ),decided bytheCouncil on13March ,
i960 (1),includes tl?eSuper-SARA Project ,to.be conducted in
the ESSOR reactor atthe Ispra Establishment ,asits single most
significant contribution .toLWR safety research .One ofthemain .
aims ofthis project istoinvestigate bysimulation inthe reactor
(in-pile )thebehaviour ofreactor fuel inloss ofcoolant accident
conditions .
This area ofLWR safety research isamajor international priority ,
in-particular following theThree Mile Island (TMI )incident inthe
United States on28March ,1979 .
2.Throughout itsdiscussions leading totheDecision onthe current
multiannual programme oftheJRC ,the Council stressed the importance
ofinternational ,cooperation inthe Super-SARA .project *Itwas
informed atthe time ofitsDecision that theCommission had s "
entered into negotiations with theUSNRC ;for apossible such
cooperation ,and that the USNRC contribution tothe project ,which
would beinkind ,had already been taken into account inthe
estimated cost oftheproject totheCommunity (2).
3.TheCouncil was informed ofthe subsequent development ofthe
Commission 'snegotiations with theUSNRC during 1980 inthe
Commission 'scommunication tothe Council onthe Execution ofthe
First Phase (1980 )oftheSuper-SARA Project (3).Inreaching its
Decision onthesecond phase oftheproject (1981-1983 ),theCouncil
again noted that the value ofthe expected USNRC contribution inkind
hadbeen taken into account inthe estimated cost oftheproject to
theCommunity (4)...
(1)O.J. n°272of18March ,1980 ,p.11
(2),Council document 5422 /80 (ATO 31)of4March ,1980 ,p.3
(3)COM (80)750 final of27November ,1980 ,"p.40
(4)Council ,document 7107 /81 (ATO 46)of19May ,1981 ,p.3

2.
4.Atthesame time ,theAdvisory Committee onProgramme Management
"Reactor Safety "and theGeneral Advisory Committee ofthe JRC
were k^pt fully informed ofthedevelopment oftheCommission 's
negotiations with the USNRC .
5.These negotiations have now successfully arrived atthe text of
adraft agreement (inthe form ofanArrangement )and annexes which
isacceptable toboth sides .Inaddition toregulating the use of
information and patents between the two parties (article 5),its
main features are :
-the USNRC will make available toEURATOM the relevant information
related tothe USPBF experiment (article 3).The Super-SARA Task
Force ,,established bytheCommission inJune 1980 togive technical
support totheCommission inthe definition ofthe Super-SARA
programme objectives and toensure the linking ofthis project
toother related experiments ,identified the importance ofthe
PBF experiment inthis context and the need toensure the comple­
mentary /confirmatory relationship between these twoprojects ,in
particular through thepooling ofinformation (5);
~the USNRC defines the inkind contribution which itistomake to
theproject (annex 3)atanannual level which itestimates as
roughly equivalent toaminimum ofUS0 (1981 )1.5million ,subject
tocontinued annual USCongress funding for theproject .This
would represent acontribution ofUS04.5million for theyears
1981-1983 under the current multiannual programme ofthe JRC or
US010.5 million over the 7year period covered bytheArrangement .
The estimated cost totheCommunity oftheproject (atMay 1981
prices )intheperiod ofthecurrent multiannual programme of
theJRC is54.03 MioEcus ,or107.53 MioEcus for the 7year period
1980-1986 (6).
-theArrangement provides fortheconsultation oftheUSNRC in
the execution ofthis cooperation .
6.TheArrangement gives 'concrete expression tothe framework
"Arrangement between the UrtitedStates I'luclear Regulatory Commission and
■theEuropean Atomic Energy Community inthefield ofNuclear Safety
Research "concluded on19March ,1979 '.This provides inter alia ,
andsubject totheconclusion ofseparate agreements between the
parties ,fortheexecution ofjoint programmes andcooperative research
projects andfortheexchange ofinformation indefined areas of
nuclear safety research conducted bytheUSNRC orEURATOM through the
JRC ,inthis case Primary Coolant System Rupture Studies andLoss of
Coolant Accident Studies andAnalyses bytheUSNRC andIn-Pile
Simulation ofLOCA bythe JRC .
7.Theimplementation ofthis Arrangement will entail noadditional
expenditure fortheJRCbudget .
(5)COM (80)750final of27November ,1980' P*5
(o)Council document 7107 /81 (ATO 46)of19May ,1981 ,p.2-3

3.
8.Thg legal basis for theArrangement isArticle 101 ,(3.)ofthe
EURATOM Treaty which specifies that agreements ,whose implementation
does not require action bythe Council and canbeeffected within
the limits oftherelevant budget shall benegotiated andconcluded
solely bytheCommission .
9.The Commission now informs the Council ofits intention toconclude
anarrangement with the USNRC inconformity with theprocedure
envisaged byArticle 101 .(3.)oftheEURATOM Treaty .Thedraft ,
Arrangement and annexes areattached tothis communication .

Cori/fi)5Z-1
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 • ■' - ,■ '
IM-PILE LWR LOCA SIMULATION \ -
The USNRC and EURATOM consider itwill bemutually beneficial to
cooperate inthe field ofreactor safety research .
Asthe USNRC and EURATOM 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
the parties ;
Asthemultiannual programme 1980-1983 ofthe Joint Research Centre ,of
the .Commission ofthe European 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 has complementary characteristics tothe
research work undertaken ^bytheUSNRC facilities ; '
The following technical cooperation will beundertaken . .

Tno contracting parties -iigreed asfollows :
ART.1 -OBJECT . .
This arrangement .covers the safety research area concerned with I.WR
fuel behaviour under loss -of-coolant accident conditions .
The USNRC participates toaCommunity research programme concerning
the experiments intheSuper-SARA circuit ofthe ESSOR reactor .This
participation concerns thepreparation oftheprogramme ,its execution
and theevaluation ofits results .The cooperation has aduration or
7years ,starting January 1,1981 ,subject tothe provisions ofART .VI
ofthe bilateral 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
and oral discussions .
2.The organization of .relevant meetings .
3.Short visits byspecialist teams orindividuals tothefacilities
ofthe other Party .
4.Possible temporary assignment ofpersonnel ofoneParty tothe
laboratory orfacilities oftheother Party ,each such assignment
tobeconsidered onaca.se -by-car»e basis andbethesubject ofa
separate 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 tothetimely ,successful performance of
tests inthecurrently proposed Super-SARA test progranme ,which ithas
the right todisclose either initspossession oravailable toit,in
particular therelevant information related tothe USPBF experiment .
'X - *
2.EURATOM will make available tothe USNRC the information relevant to
Ithe execution oftheSuper-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 i
The general provisions ofART .IV .ofthe bilateral arrangement apply .
> ' '' ? - '~ -
-"Each Party will designate asAdministrator asenior representative
'"tocoordinate itsparticipation intheoverall exchange .Areview ^
"meeting oftheAdministrators ortheir representatives will be
"held atagreed-upon intervals .toreview thestatus ofexchange
"and cooperation established under this Arrangement ,to ,recommend
"revisions for improving anddeveloping the cooperation ,and to
"discuss topics within the scope 6fthe cooperation .The time ,place
"and agenda for such meetings shall beagreed upon inadvance .
Specific provisions concerning theximplementation ofthescientific -
technical content ofthepresent cooperation are given inAnnex II.
ART .5-USE OFINFORMATION AND PATENTS " - .
Theprovisions ofART .Vand VII of ..thebilateral arrangement apply .

"EXCHAUGE AND USE OFINFORMATION
1.The Parties support thewidest possible dissemination ofinformation
provided orexchanged under .this Arrangement ,subject totheneed
toprotect proprietary information asmaybeexchanged 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 ,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 ,andmay only include information which :
(a)hasbeen held inconfidence byitsowner ;and
(b)isofatype which iscustomarily held inconfidence byits
owner ;and '
(c)has not been transmitted bythe transmitting Party toother
entities (including thereceiving 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
Arrangemqnt 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 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
the Governments ofthe United States and ofthe member states of
EURATOM without theprior approval of ' .
This notice shall bemarked onany reproduction hereof ,inwhole orin
part .These limitations shall automatically terminate when this
information isdisclosed bytheowner without restriction .
■/.

Inregard tothedissemination and use ofproprietary information 1
received inconfidence under this Arrangement ,theParties 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 ofthe' receiving Party ;
(b)prime orsub-contractors orconsultants ofthe receiving
Party located within the geographical limits ofthe receiving
Party 'scountry ormember states ,f6r ,use only within the
framework oftheir contracts wi.th the receiving Party in .
work relating to "the 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 foruseonly within thescope -ofthepermit "orlicense
granted tosuch organizations ;
provided that any proprietary information sodisseminated' under
sub-paragraphs (b),(c)and (d),above shall bepursuant toanagreement
ofconfidentiality and shall bemarked with arestrictive legend
substantially identical tothat appearing in'paragraph 3above .
(ii)With the prior 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 cooperate with -each other indeveloping procedures for
requesting andobtaining approval for .such wider dissemination
andeacn Party will grant such approval tothe extent permitted
byits national policies ,regulations and laws ..
(iii )Each ,Party shall .exercise itsbest efforts toensure that
'proprietary information received byitunder this Arrangement i:.-
controlied asprovided herein .Ifone ofthe Parties becomes
aware that itwill be ,ormay reasonably beexpected tobociue ,
unable tomeet the non-dissemination provisions ofthis Article ,
it -shall immediately inform theother Party .The Parties shall

6.
thereafter consult todefine anappropriate course ofaction .
(iv)Non-documentary proprietary information provided inseminars
andother meetings organized 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 knowledge andbelief oftheParty
giving it,but neither Party gives any warranty astothe accuracy
ofsuch information orshall have any responsibility for the
«
consequences ofany use towhich such information may beput bythe
other Party orbyany third party ."
"PATENTS , ' ,
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.VJith respect toanyinvention ordiscovery made orconceived inthe
course oforunder this Arrangement ;
(i)Ifmade orconceived bypersonnel ofone Party (theAssigning
Party )orits contractors 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 to-a non-exclusive ,
irrevocable ,royalty-free license inallsuch countries tothe
Assigning Party ,with theright togrant sub-licenses ,under any
such invention ordiscovery and anypatent application ,patent or
other orotection relating thereto ,foruse intheproduction or
■/.

7.
utilization ofspecial nuclear material oratomic energy ;and
(b)TheAssigning Party shall acquire all right ,title ,and
interest inand toany^such invention ordiscovery initsown
Country ,subject toanon-exclusive ,irrevocable ,royalty-free ,
license totherecipient party ,with theright togrant sub-
licenses under any such invention ordiscovery and anypatent
application ,patent orbther protection relating thereto for
use intheproduction or .utilization ofspecial nuclear material
oratomic enery . ' , . •
(ii)Ifmade orconceived by -personnel other than thepersonnel referred
toinparagraph (i)above ,asaresult ofattendance atmeetings ■
pras'aresult ofemploying information v/hich 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 totheother Party ofaroyalty-free non-exclusive ,irrevocable
license ,with the right togrant sub-licenses ,in ,and toany such
invention ordiscovery and any patent application ,patent orother
protection relating thereto inall "countries ,foruse inthe
production^or utilization 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 no'rmally own therights tosuch inventions ordiscoveries
inits own Country with aroyalty-free ,non-exclusive ,irrevocable
I \
license tothe other Party ,and the rights tosuch inventions or
discoveries inother countries should beagreed bythe -Parties on
anequitable basis . 1 '
Neither Party shall discriminate against citizens ofthe Country of v
theother Party with respect togranting any license orsub-license
under any invention ordiscoverv pursuant toparagraph 1above .
I - "
: ' ./.

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 ofthe Parties .
4.Neither Party will assume theresponsibility topay awards or
conpensation 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 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 totheentry into
force ofthis Arrangement which ,ifthey hadoccurred subsequent tothe
entry into force ofthis Arrangement ,would have been subject tothis
Arrangement ,shall besubject totheterms hereof .

FOR THE UNITED STATES .. . ' . FOR EURATOM -
NUCLEAR REGULATORY COMMISSION COMMISSION OFTHE EUROPEAN COMMUNITIES
BY : ; 1 BY : . . .
TITLE : ' TITLE :
DATE : ■ DATE : ■ ■

ANNEX 1
OUTLJNE_OF_THE_SyP!R|ARA =T|S5 =P|OGRAM ==i|STP2
y
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 andtechnological 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 ofLWRfuel 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
mechanical and therir.chydraulics processes governing LWR
fuel cluster damage andblockage ,asecond basic objective
isthe correlation ofthe transient fission product release
(FPR )occur ;r.gduring accident situations with thetype and
extent ofthefuel 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 -under certain ,circumstances
could lead toperiods ofpartial core uncovery ar.dhigher
clad temperatures and apotential forsevere fuel damage
(SFD ).An "important example ofsuch atransient leading to
SFD isprovided bytheThree Mile Island (TMl )accident .
Itisunderstood that 'more emphasis should beplaced
onthe SFDpart oftheprogram .than ontheLB-LOCA part .
Thereason 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 oftheconsensus SSTP has been establi­
shed onthebasis that ismust beconfirmatory with respect
tothecurrent out-of-pile L3-L0CA fuel behaviour programs
such asREBEKAattheKfKKarlsruhe (which areable to
scope well the governing parameters and require only li- -
mitedm-pile checks toconfirm the typicality ofrod- ^
simulators performance )ar.dcomplementary with respect to
thecurrent m-pile LB-LOCA programs ;such asPBFatINEL - !
Idaho -andPHEBUS atCadarache ,France (where thedata '" ...
available orexpecred should bebacked upbyin-pile tests
which give something new ).„
The SUPE.RSA2A loop isbeing fabricated with thedesign -
aim tosimulate the -entire LB-LOCA .scenario ,blowdown to
reflood ,bymeans' ofcontrol actions onvalves and cluster
power .This capability will beexploited inorder tomeet
thebasic objectives stated above ,which ,for theLB-LOCA
••/•*

takeonthefollowingparticular form:
-Claddeformationcharacteristics ,likelytobe
dominatedbyhighstrain-rateballooning ,influencing
thedegreeofclusterblockage.
-Interactions causedbydeformations whichmight
influencetheclusterblockage .fraction.
-Rodclustercoolability andthermalresponseduring
refloodmg.
-Dependence -.ofFPRontheextentofclusterdamage.
Theconsensus LB-LGCAtestmatrixwhich
fitswithintherequiredconfirmatory/complementary contextis
coveredbythefollovi^gtests:
-4Testswith2mlongPVR(type17x17)clustersof32
rods;
-1testwitha2mlongBWR-typecluster(probablytype
•8x8R);
-2unspecified teststocoverunforeseenrequirements
ofhicrhpriorityarisinaatalaterstage.
Coreuncovervar.dSFDtestprogran
Incontrastto"dieL3-L0CApart,theSFDpartofthe
consensus 5ST?seekstogenerateamorecomprehensiverange
ofdata.Thereisnotcurrentlythewidevarietyofactivity
forSFDasfortheL3-L0CAfield:theonlyotherknown
conparable SFDprogramjsthatplannedfortheP3FatINEL
-Idaho,startingi::1382.ThePHE3U3program mayalso
proposeSFDtests,inwhichcasethesewillalsohavetobe
considered .Forrhetmebeing,theSSTPhastoensurea
/
••♦/••»

goodcomplementary/confirmatory relationship onlywiththe"
PBFprogram.
Consider:ngthebasicobjectivesstatedaboveandthe
largearrayofaccidentscenarioswhichmaypptentially lead
toSFD,asoccurredinthecaseoftheTMIaccident,the
SUPERSARAloophasthedesignaimtosimulatetheessential
commonfeatureofalltheSFDscenarios :clusterboildown^
anduncoverytoprovokerelevanttransientofclad
temperatureihcombination withrelevanttransientsof
systempressure,followedbyre-submergence andquenching.
Thiscapabilitywillbeusedtoaddressthefollowing
particular SFDobjectives. ._,,
A)DegreeofclusterblockageandFPRduetocladdefor­
mationandruptureatthelowstrain-rates possiblein
"coreuncovery"transients ,especiallyconsidering the
effectsofcladoxidation onsuchdeformation inthe
high»<-high^range(1100-1650K).
B)DegreeofclusterblockageandFPRresultingfromthe
formationofarubblebed.duetothewidespread oxida­
tionoftherods(upto1900K),withorwithoutprior
ballooningandrupture,followedbyrodfragmentatiion
eitherbyquer.cnir.g (re-submergence )or.systemdepres-r
sur-sation.
C)DegreeofclusterblockageandFPRresultingfromthe
'formationofaZr/uo^liquidsolutionabove~2070K
(rod"candling")inthepresenceofwidespreadrod,
oxidat-bn ,wit.",crwithoutsubsequentrubblebed
provocation byquenching ,.
-.•Theconsensus SFDtestmatrixwhich
fitswithiri-therequired ,complementary/confirmation relation
withPBF,willbeattainedbymeansofthefollowingtests:

-3testswithobjective (A),allwith2mlougPWRtype
clustersof32rods;
-4testswithobjective (B),3with2mlov.gPWR.type
clustersof32rods,1witha2mlo:igBV7Rtypecluster;
-5testswithobjective (c),4with2mlo:.gPWRtype
clustersof32rods,1witha2mlo.igBWRtype-cluster;
-2unspecified teststopermitthe:.'nclusionofunfore­
seenobjectiveswhichmaylaterbecomeofh:ghpriority.
X

TABLE 1:SSTP LARGE BREAK LOCA TEST MATRIX
!
TEST N°
1INTENTIONSCLUSTER
TYPE .CLAD DEFORMATION
CONDITIONSFUEL COMMENTS
LB-1INVESTIGATE CLAD '
DEFORMATION IN fiPHASE IN
"HEAT BEFORE LOAD "
CONDITIONSPWR -(*)HEAT -BEFORE -LOAD;
DEFORMATION
AT~1300KFRESH
PRECONDITIONED
COMPLEMENTARY TO
PHEBUS ,PBF,NRU
Χ LB-,2HIGH POTENTIAL FOR CLAD
•DEFORMATION (HIGHQ ();
"HEAT BEFORE LOAD "
CONDITIONSι
PWR (*)HEAT -BEFORE -LOAD ;
DEFORMATION
AT 1070 ΚFRESH
PRECONDITIONED
LB-3ASTEST LB–2BUT
DEFORMATION IN "LOAD
BEFORE HEAT "CONDITIONSPWR (*) 'LOAD -BEFORE -HEAT;
DEFORMATION .,
AT^1070KFRESH
PRECONDITIONED1
CONFIRMS
REBEKA ,MRBTF
COMPLEMENTARY TO
NRU .LB-4ASTEST LB-3 BUT
INVESTIGATE EFFECT OFFUEL
BURN-UP I.E. FUEL CRACKING ,
RELOCATION ETC .PWR (*)LOAD -BEFORE -'ΈΑΤ;
DEFORMATION
AT~-1070KSOME
IRRADIATED
RODS
LB-5ASTEST LB-3 BUT
CONFIRM EXTRAPOLATION OF
PWR TEST RESULTS TOOTHER
FUEL GEOMETRIESBRW (**) ■
\LOAD -BEFORE -HEAT ;
DEFORMATION
AT 1070KFRESH
PRECONDITIONEDCOMPLE MENTARY TO
PHEBUS ,PBF ,NUR f
REBEKA ,MRBTF
LB-6
LB-7
V–/ · ·
» · ■ ' ' Λ ν ·
2UNSPECIFIED TESTS TOPERMIT TESTING OFREMEDIAL MEASURES ORANYOTHER STUDY LATER ENTIRINGHIGH PRIORITY -
(*) "17X17 TYPE GEOMETRY
(**) PROBABLY 8x8 TYPE GEOMETRY

·»!'
TABLE2:SSTPCOREUNCOVERY/SEVEREFUELDAMAGETESTMATRIX
TESTSERIESA:INVESTIGATION OFEXTENTOFCLUSTERBLOCKAGE ANDFISSIONPRODUCTRELEASE
DUETOCLADDEFORMATION UNDER"SMALLANDMEDIUMBREAK"CONDITIONS
COMPLEMENTARY TOPBF.
TESTΝ°CLUSTER
TYPE INTENTION TESTTERMINATION/FINALCONDITIONS
SFD-A-1PWR(*)CLUSTERUNCOVERY TOTCLADrv1080-
1200K,THENCLADLOADINGAND
BALLOONING BYSLOWPRESSURE RAMP
ΔΡCLAD–0.005MPa/SCLUSTERRE-SUBMERGED AFTERWIDESPREAD
CLADRUPTURE
SFD-A-2PWR(*)AS.SFD-A-1BUTWITHTCLAD 1350KAND
ΔΡCLADADTESTED INRANGE0.005-0.05
MPa/STOGETDESIREDOXIDATION DURING
BALLOONINGCLUSTERRE-SUBMERGED AFTERWIDESPREAD
CLADRUPTURE
SFD-A-3PV/R(*)ASSFD-A-2BUTWITHTCLAD~1650KCLUSTER RE-SUBMERGED AFTERWIDESPREAD
CLADRUPTURE
*17x17TYPEGEOMETRY

/
TABLE2(CONT.)*.SSTPCOREUNCOVERY/SEVEREFUELDAMAGETESTMATRIX
TESTSERIE&B:'INVESTIGATION OFEXTENTOFCLUSTERBLOCKAGEANDFISSIONRPODUCTRET,EASE
: .WITHNOMOLTENCOMPONENT DUETORODFRAGMENTATION ANDRUBBLEBEDFORMATION ;
COMPLEMENTARYTOPBF
TESTN°CLUSTER
TYPEINTENTION -. TESTTERMINATION/FINALCONDITIONS -
SFD-B-1PWR(*)CLUSTERUNCOVERY TOTCLAD«ν1900KAT
ARATE-ν0.3K/sTOFROVOKECLAD
RUPTUREAT~11OOKFOLLOWED WIDESPREAD
CLADOXIDATION ANDEMBRITTLE MENT.
PSYS«-r8MPaV '■
SLOWCOOL-DOWN TOAVOIDROD'.
FRAGMENTATION ANDRUBBLEBED
SFD-B-2.PWR(*j ASSFD-B-1 , .
'· 1
\FASTCOOL–DOWNTOPROVOKE ROD
FRAGMENTATION ANDRUBBLEBEDFORMATION
SFD-B-3
^ ·»PWR(*).ASSFD-B-1BUTWITHCLADRUPTURE
OCCURINGAT^1650K 'ASSFD-B-2
SFD-B-3BWR(**)'CLUSTERUNCOVERY TOTCLAD»->1500KWITH
NORUPTUREC6PCLAD<θ);WIDESPREAD
CLADOXIDATION ATΛ/130OK;SLOWCOOL-
DOWNTOTCLADλ/600K.PSYS~4MPa ■·.PSYSDROPPEDFROM4TO1MPaTO.PROVOKE
CLADSHATTERING FORTCLAD~600K.SL0W
COOL-DOWN CONTINUED TOAVOIDFURTHER .
RODFRAGMENTATIONc*o
' I
*17x17TYPEGEOMETRY
**PROBABLY8x8TYPEGEOMETRY :

,TABLE2(CONT.)SSTFCOREUNCOVERY/SEVEREFUELDAMAGETESTMATRIX
TESTSERIESC:INVESTIGATION OFEXTENTOFCLUSTER BLOCKAGE DUETOFORMATION OFA
MOLTENSOLUTIONOFU02INZIRCALLOY (ROD"CANDLING "),POSSIBLY
FOLLOWED BYQUENCH •INDUCEDRUBBLEBED;PWRTESTSCONFIRMATORY TO
PBF,BWRTESTCOMPLEMENTARY
TESTN°CLUSTER
TYPEINTENTION TESTTERMINATION/FINALCONDITIONS .
SFD-C-1PWR(*) CLUSTER UNCOVERY TOTCLAD~2300KAT
ARATE.~4K/sTOPROVOKECLADRUPTURE
AT-1100ΚFOLLOWED BYCLADOXIDATION,
MELTINGAMDDISSOLUTION OFU02
(CANDLING)TOFORMFROZENSLAGAT
COOLERELEVATIONS .PSYS~8MPaY»
SLOWCOOL–DOWNTOAVOIDRUBBLEBEDDUE
TOFRAGMENTATION OFRODSANDSLAG
SFD-C-2PWR(*) ASSFD-C-1 FASTCOOL-DOWN TOPROVOKERUBBLEBED
DUETOROD'ANDSLAGFRAGMENTATION
SFD-C-3-PV/R(*) ASSFD-C-1BUTWITHCLADRUPTURE
OCCURING AT-V1650ΚASSFD-C-2
SFD-C-1 ~PWR(*)ASSFD-C-1BUTWITHFASTERUNCOVERY
TOSIGNIFICANTLY EXCEED4K/sTCLAD
RAMPTOINVESTIGATE MOREEXTENSIVE
CLADMELTING/
ASSFD-C-2
SFD-C-5BWR(**)ASSFD-C-1BUTWITHÄPCLAD<υTOGET
CLADCREEP-DOWN INSTEADOFRUPTURE;-'
POTENTIAL FORMORECLADMELTING AND
ASSESSMENT OFBWRSUBASSEMBLY ÎELT–
THROUGH
»ASSFD-C-1
*.17x17TYPEGEOMETRY
**PROBABLY 8X8RTYPEGEOMETRY

TABLE2(CONT.):SSTPCOREUNCOVERYSEVEREFUELDAMAGETESTMATRIX
TESTSERIESD:UNSPECIFIED TESTS ~ : v,
TESTN°SFD–D–1:)2UNSPECIFIED TESTSTO™3RMITSTUDIES 'LATERENTERINGHIGHPRIORITY,
TESTN°SFD–D–2:)CURRENTLY UNFORSEEN ,

Μ
AN :IF.:-:N
Bilateral Technical InDlemcntation Committee
The contractiong Parties nereby set upaBilateral Technical
Implementation Committee toassure the execution ofthe
co-operation provided for inthis Arrangement .
Each Party will designate its members tothis Bilateral
Committee ana 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 SST programme progress and
its continued applicability tocurrent NRC programme objectives .

•il;
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.NRC basic supply of3test trains including all precalculations ,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
SSTprogramme ,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 ofPBFtest experiment andresults (e.g. shroud
performance )into Super-SARA planning . 1
3.Short term assignments prtoviding :
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 in "calibration andapplication ofthetransient thermo­
"hydraulic instrumentation ; ,
3.4 ..assistance indesign ,testing andapplication ofthe transient rod system
3.5 .assistance inthefission product release (FPR )field ,with aview to
attaining optimal specifications for theSuper-SARA FPR monitoring
system inthe light ofUSexperience with similar equipment .
4.Supporting services inthe US' : •■
4.1 .special analyses ,defined and requested byIspra and agreed toby
NRC ,tosupport ;
4.2.,back-up for item 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 ,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 .