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

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COMMISSION DESCOMMUNAUTES EUROPEENNES
COM(81)551 final
Bruxelles,le1eroctobre1981
fernsq -V\
Ktt ••?•••-•
ç*>.I
ACCORDENTREL'AGENCEDECONTROLE NUCLEAIRE DESETATS-UNIS (USNRC)
ETLACOMMISSION DES*COMMUNAUTES EUROPEENNES AUNOMDELACOMMUNAUTE
V.•T"
EUROPEENNE DEL'ENERGIEATOMIQUE (EURATOM)SURLASIMULATION EN-PILE
DESACCIDENTS DEPERTEDEREFRIGERANT (LOCA)DANSLESREACTEURS A
EAULEGERE(LWR)
(Communication delaCommission auConseil)
COM(81)551final

CJSW ,
«
OBJET :Communication auConseil concernant unaccord entre l'Agence de -
Contrôle Nucléaire des Etats-Unis (USNRC )etlaCommission des
Communautés Européennes aunomde laCommunauté Européenne
del'Energie Atomique (EURATOM )surlasimulation en»pile des
accidents deperte deréfrigérant (LOCA )dans lesréacteurs
àeau légère (LWR ).
1.Leprojet Super-SARA ,quiestréalisé dans lereacteur ESSOR de
l'Etablissement d'Ispra ,constitue lacontribution laplus importante ,
enmatière derecherche sur lasûreté des réacteurs aeau légère ,
del'actuel programme derecherche pluriannuel duCentre Commun de
Recherche (CCR),arrêté parleConseil le13mars 1980 (1),^ \
Undesobjectifs principaux deceprojet estd'étudier parsimulation
en»pile lecomportement -deséléments decombustible dans lesconditions
deperte deréfrigérant . '
Cedomaine del'étude dela .sûreté des LWR est une priorité auniveau
international ,notamment suite àl'incident deThree Mile Island (TKI )"-
aux Etats-Unis le28mars 1979 -  
2.Tout aulong desdiscussions quiontconduit àl'adoption duprogramme
pluriannuel actuel duCCR ,leConseil asouligné l'importance dela
coopération internationale pour leprojet Super-SARA .Aumoment de
sadécision ,leConseil avait été informé que laCommission avait
entrepris desnégociations avec l'USNRC envue d'une telle coopération
etque lacontribution ennature del'USNRC avait étéprise encompte
lors dèl'estimation ducoût duprojet pour laCommunauté (2).
3.LeConseil futinformé del'évolution desnégociations durant L'année
1980 parlaCommunication auConseil sur l'exécution delapremière
phase (1980 )duprojet Super-SARA (3).Lors desadécision sur la
seconde phase duprojet (1981-1983 ),leConseil répéta que lavaleur
delacontribution del'USNRC avait étéprise encompte dans l'estimation
ducoût duprojet pour laCommunauté (A).
(1)O.J. n272du18mars 1980 ,p.11
(2)Document duConseil 5422 /80 (AT0 31)du4mars 1980 ,p.3
(3)C0M(80 )750final du27novembre 1980 ,p.40
(4)Document duConseil 7107 /81 (AT0 46)du19mai 1981 ,p.3

4.LeComité Consultatif enMatière deGestion duProgramme Sûreté
des réacteurs "etleComité Consultatif .Général duCCR ont été tenus
pleinement informés dudéveloppement desnégociations delaCommission
avec 1'USNRC ..
5.Cesnégociations ontabouti àuneproposition d'accord (sous laforme
d'un !'Arrangement ")etd1annexes acceptables pour lesdeux ,parties .,
Enplus des règles relatives àl'utilisation des informations ,etdes
brevets (article 5),lespoints principaux sont lessuivants .:
-1'USNRC mettra àladisposition del'EURATOM toute information utile
relative àl'expérience USPBF (article 3).LaTask Force Super-SARA ,
établie par laCommission enjuin 1980 afin defournir uneassistance
technique àlaCommission pour ladéfinition des obje'ctifs duprojet
Super-SARA etd'assurer uneliaison entre ceprojet etlesautres
expériences dans cedomaine ,note l'importance del'expérience PBF .
xetlanécessité d'assurer unebonne relation complémentaire /conf ir-
matoire .entre ces^deux projets ,notamment par lamise encommun
des informations (5);
-1'USNRC fixe sacontribution ennature (annexe 3)àunniveau annuel
équivalent qu'elle estime à .1,5millions dedollars US (1981 )-
conditionné par lamise àdisposition annuelle des fonds par le
Congrès desEtas-Unis .Cela représenterait unecontribution de
A,5millions dedollars USpour lesannées 1981-1983 duprogramme
plurianuuel oude10,5 millions dedollars USpour lapériode de--'
7anscouverte par l'accord .Lacontribution delaCommunauté
s'élèverait à54,03 MUCE (prix 1981 )pour lapériode duprogramme
pluriannuel ouà107,53 MUCE ,pour lapériode de7ans -1980-1986 (6).
-l'accord prévoit laconsultation de1'USNRC pour l'exécution
decette coopération .
6.L'accord estun'aboutissement concret qui s'insère dans lecadre de
i,"Acoord entre l'US'NRC etl'EURATOM dans ledomaine delarecherche
ensûreté nucléaire "conclu le19mars 1979 -,Cetaccord prévoit ,
entre autres ,sous forme d'accords séparés àconclure entre lesparties ,
l'exécution deprogrammes communs etdeprojets derecherche en
collaboration etl'échange d'information entre l'USNRC etleCCR
représentant l'EURATOM ,dans certains domaines spécifiques dela
recherche ensûreté nucléaire ,àsavoir dans lecasprésent lesétudes
sur larupture ducircuit derefroidissement primaire etlesetudes
etanalyses relatives auxaccidents deperte deréfrigérant par
l'USNRC etsimulation en-pile deL0CA par leCCR .
7.L'exécution del'accord n'impose pasdedépense supplémentaire au
budget duCCR .
« , -
(5)C0M (80)750final du27novembre 1980 fp,5
(6)Document duConseil 7107 (ATO46)du19mai 1981 ,p.2-3

8.Labase juridique decet accord est l'article 101 .(3.)duTraité
instituant l'^EURATOM ,quiprécise que lesaccords dont l'exécution
n'exige pas une intervention duConseil etpeut être assurée dans
les limites dubudget intéressé sont négociés etconclus par la
Commission .
19.'LaCommission informe maintenant leConseil deson intention de
conclure unaccord avec 1'USNRC ,conformément àlaprocédure
prévue par l'article 101 .(3.)duTraité instituant l'EURATOM .
Leprojet d'Accord -etsesannexes sont joints àlaprésente
Communication .

Ceri (Y\)
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 "
IN-PILE LWR LOCA SIMULATION
The USNRC and EURATOM consider itwill 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
oftihis bilateral arrangement foresees thepossibility ofcooperative
research projects based onthe facilities owned oroperated byone of
theparties ; - . , ^ "
Asthemultiannual programme 1980-1983 of 'the Joint Research Centrfe of
theCommission oftheEuropean Communities contains anactivity on
reactor safety towhich this cooperation will directly contribute ;
AstheESSOR reactor ,owned and operated by .theJoint 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 bythe USNRC facilities ; ■' "
The following technical cooperation will beundertaken . .

^The contracting parties *agreed asfollows
ART .1-OBJECT
This arrangement covers the safety research are'a concerned with LVJR
fuel behaviour under loss -of-coolant accident conditions ".
The USNRC participates toaCommunity tesearch programme concerning
the experiments intheSuper-SARA circuit' oftheESSOR reactor .This
participation concerns thepreparation oftheprogramme ,its execution
and theevaluation ofits results .The cooperation has aduration of
7years starting January 1,1931 ,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 .IIofthe bilateral
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 tothe facilities
ofthe other Party .
.4.Possible temporary assignment ofpersonnel ofoneParty tothe
laboratory orfacilities oftheother Party ,each such assignment
tobeconsidered onaca.se -by-car.e 1basis andbethesubject ofa
separate attachment ofstaff agreement between theParties .
5.The supply 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 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 . -
• "·. - ·X
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 ortheir representatives will be
"held atagreed-upon intervals toreview the status ofexchange
"andcooperation established under this Arrangement ,torecommend
."revisions for improving and developing the cooperation ,and to
"discuss "topics within thescope ofthecooperation .The time ,place -
"and agenda 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 .VandVII ofthebilateral arrangement apply .

<1.-
EXCHANGE AMD 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 ,and .any 'other
information intended tobeprovided or'exhanged 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 rece'iving 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 . 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 tothe -dissemination and use ofproprietary information
received inconfidence under this Arrangement ,the Parties agree that :
(i)Such information may be .disseminated 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 ; -
Λ
(b)prime orsub-contractors orconsultants ofthe receiving
Party located within the'geographical limits ofthe receiving
Party 'scountry ormember states ,for use only v/ithin the
vframework oftheir contracts with thereceiving Party in
work relating tothe subject matter oftheproprietary
information ; .
(c)organisations 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 anyproprietary information sodisseminated under
sub-paragraphs (b),(c)and (d),above shall bepursuant toan'agreement
ofconfidentiality and shall bemarked with arestrictive legend
substantially identical to .that appearing inparagraph 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 forsuch 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 .If -one ofthe Parties becomes
aware that itwill bs ,ormay reasonably beexpected "tobecome ,
unable tomeet thenon-dissemination provisions ofthis Article ,
itshalV immediately inform theother Party .-The Parties shall

6.
thereafter consult todefine anappropriate course ofaction .
(iv)Non-documentary proprietary information provided inseminars
and other meetings organized under this Arrangement ,or
information arising from the attachments ofstaff ,use of
facilities orjoint projects shall betreated bytheParties
inaccordance with theprinciples specified inthis Article ,
provided ,however ,that the Party 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 tothe other under this Arrangement
shall beaccurate tothe best knowledge and belief ofthe Party
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 ."
"PATEI ITS
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 by .personnel 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 the right togrant sub-licenses ,under any
such invention ordiscovery and anypatent application ,pacent or
other protection relating thereto ,for use inthe production or(iv
(V)
(Vi

utilization ofspecial nuclear material oratomic energy ;and
(b)TheAssigning Party shall acquire all right ,title ,and
interest 'inand toany such invention ordiscovery inits ov/n
Country ,subject toanon-exclusive ,irrevocable ,royalty-free
license totherecipient party ,with theright togrant sub-
licenses under any such invention ordiscovery and anypatent
application ,patent orother protection relating thereto for
use intheproduction orutilization ofspecial nuclear material
oratomic enery .
(ii)Ifmade or .conceived 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 qrits 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 orutilization ,ofspecial nuclear material oratomic
energy . , '. s '.
(iii )With regard toother specific forms ofco-operation ,including
loans orexchanges ofmaterials ,instruments and equipment for •.
• !• '
special joint research projects ,theParties shall provide for
appropriate distribution ofrights toinventions ordiscoveries
resulting from such co-operation .Ingeneral ,however ,each Party •
should normally own the righ-ts tosuch inventions ordiscoveries
inits own Country with aroyalty-free ,non-exclusive ,-irrevocable
license totfieother Party ,and therights 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 ordiscoverv pursuant toparagraph 1above .

8.
Itisunderstood that the licensing policies and practices ofeach
Party may beaffected because ofthe rights 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 oftheParties .
[
/
4.Neither Party will assume theresponsibility topay awaras or
compensation required tobepaid tothenationals oftheother Party
according tothe laws oftheother Country ."
ART .6-COSTS
The USNRC will participate in-kind inthe costs fortheprogramme atan
annual level roughly equivalent to1,500,000 US1981 dollars ormore ,
subject tocontinued annual UScongressional funding ofprogramme support
andmaintenance ofSSTprogramme content andprogress .This participation
will beintheform ofsupply oftest hardware ,manpower andservices as
defined inAnnex III .
ART .7-FINAL PROVISIONS
1.This Arrangement shall enter into force fromthedate ofconclusion
thereof , and ,subject toparagraph 2ofthis Article ,shall
remain into force for aperiod of7years ,unless previously extended
byagreernent between theParties .
2.Either Party maywithdraw from thepresent Arrangement after providing
theother Party written notice 1year prior toitsintended date of
withdrawal ..
3.TheParties agree that alldiscussions ,meetings ,exchange ofdocuments
orother acts ofcooperation between them andprior totheentry into
force_of this 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
Bï : '
TITLE i^ ■ 'FOR EURATOM
COMMISSION OFTHE EUROPEAN COMMUNITIES
BY . . '
TITLE : -
DATE

ANNEX 1
Oy|LïNE =QF=|H|=|UPERS4P ^=T!|T=PRQGRAM'___(_SSTPj .
1.General
DUXing 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 oftheconsensus SSTP isthe
attainment ofdata and adeeper generic understanding con­
cerning those aspects ofLWRfuel cluster behaviour which
can lead tosignificant fuel damage ,core blockage and
coolability problems asaresult ofhypothetical accident
situations ofalowprobability where normal safeguard sy­
stems are assumed tcbepartially orwholly in-operative .
Inaddition tosuch anunderstanding ofthe thermo -
mechamcal and thermchydraulics processes governing LWR
fuel cluster damage andblockage ,asecond basic objective
isthe correlation ofthe transient fission product release
(FPR )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 -

coolant-accident (LB-LOCA )and the -transient 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).-Animportant 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 .
The reason for this isessentially that ,while aconsiderable
amount ofwork hasbeen started orcompleted for theLB-LOCA ,
activities intheSFDfield arerelatively behind andrequire
intensification .
LB-LOCA test program
The LB-rLOCA part ofthe -consensus SSTP has been establi­
shed onthebasis that ismust beconfirmatory with respect
tothecurrent out-of-pile LB-LOCA fuel behaviour programs
such asREBEKA attheKfKKarlsruhe (which areable to
scope well the governing parameters and require only li­
mited m-pile checks toconfirm the typicality of'rod-
simulators performance )ar.dcomplementary with respect to
thecurrent' m-pile LB-LOCA programs ..such asPBFatINEL-
Idaho andPHEBUS atCadarache ,France (where thedata
available orexpected should bebacked upb>yin-pile tests
which give something new ). . .. ; -
The SUPER SA2A loop isbeing fabricated with thedesign
aim tosimulate theentire LB-LOCA scenario ,blowd own to
reflood ,bymeans 'cfcontrol actions onvalves and' cluster
power .This capability will beexploited inorder tomeet
thebasic objectives stated .above ,which ,..for theLB-LOCA

-3-
takeonthefollowingparticular form:
-Claddeformationcharacteristics ,likelytobe
dominatedbyhighstrain-rateballooning ,influencing
thedegreeofclusterblockage.
-,Interactions causedbydeformations whichmight
influencetheclusterblockagefraction.
-Rodclustercoolability andthermalresponseduring
refloodmg.
-Dependence -ofFPRontheextentofclusterdamage.
Theconsensus LB–LOCAtestmatrixwhich
fitswithintherequiredconfirmatory/complementary contextis
coveredbythefollowingtests:
-4Testswith2mlongPWR(type17x17)clustersof32
rods;
-1testwitha.2mlongBWR-typecluster(probablytype
■8x3R);
-2unspecified teststocoverunforeseenrequirements
ofhiahpriorityarisingatalaterstage.
3.Coreuncovervar.dSFDtestprogram
IncontrasttotheL3-L0CApart,theSFDpartofthe
consensus SSTPseekstogenerateamorecomprehensive range -
ofdata.Thereisnorcurrentlythewidevarietyofactrvity
forSFDasfortheL3-L0CAfield:theonlyotherknown
comparable SFDprogramisthatplannedfortheP3FatINEL
-Idaho,startingin1982.ThePHE3USprogram mayalso
proposeSFDtests,.inwhichcasethesewillalsohavetobe
considered .Perthet•mebeing,theSSTPhastoensurea
•••/•«»

good complementary /confirmatory relat :onship only with the
PBFprogram . •
Considering thebasic objectives stated above and the
large array ofaccident scenarios which may potentially lead
toSFD ,asoccurred inthecase 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 and rupture atthe low strain-rates possible in
"core uncovery "transients ,especially considering the
effects ofclad oxidation onsuch deformation inthe
high »<-high^range (~1100-1650K );
B)-Degree ofcluster blockage andFPRresulting from the "
format :onofarubble bed due tothewidespread oxida­
tion oftherods (upto^1900K ),with orwithout prior
ballooning andrupture ,followed byrod fragmentation
either byquer.cnmg (re-submergence )orsystem depres­
surisation . -
C)Degree ofcluster blockage andFPRresult :ngfrom the
formation ofa-Zr/U02liquid solution above~2070K
(rod "candling ")inthepresence ofwidespread rod
oxidat-on ,wit ",crwithout subsequent rubble bed
provocation byquenching .
" ' *
The consensus SFD .test matrix which
fits within therequired complementary /confirmation relate on
with PBF ,will beattained bymeans ofthe ;following tests :

-5-
3testswith,objective (A),allwith2mloi.gPWRtype
clustersof32rods;
4testswithobjective (B),3with2mlo.-.gPWRtype
clustersof32rods,1witha2mlongBV/Rtypecluster;
5testswithobjective (c),4with2mlo:.gPWRtype
clustersof32rods,1witha2mlo.-.gBWRtypecluster;
2unspecified teststopermittheinclusionofunfore­
seenobjectiveswhichmaylaterbecomeofhighpriority.

/
TABLE1:SSTPLARGEBREAKLOCATESTMATRIX
TESTN°INTENTIONSCLUSTER
TYPECLADDEFORMATION
CONDITIONSFUEL COMMENTS
LB-1INVESTIGATE CLAD
DEFORMATION INFIPHASEIN
"HEATBEFORELOAD".
CONDITIONSPWR(*)HEAT-BEFORE-LOAD;
DEFORMATION
AT~1300K.FRESH
PRECONDITIONED
HCOMPLEMENTARY TO
PHEBUS,PBF,NRU
.# LB-2HIGHPOTENTIAL FORCLAD
DEFORMATION (HIGH^);
"HEATBEFORELOAD"
CONDITIONS ·,PWR(*)HEAT-BEFORE-LOAD;
DEFORMATION
AT-NJ1070KFRESH
PRECONDITIONED
LB-3ASTESTLB-2'BUT
DEFORMATION IN"LOAD
BEFOREHEAT"CONDITIONSPWR(*)LOAD-BEFORE-HEAT;
DEFORMATION
AT1070K
1FRESH S
PRECONDITIONED1
CONFIRMS
REBEKA,MRBTF
COMPLEMENTARY TO
NRU
\LB-4ASTEST'LB-3BUT
INVESTIGATE EFFECTOFFUEL
BURN-UPI.E.FUELCRACKING ,
RELOCATION ETC.PWR(*)LOAD-BEFORE-:ΈAT;
DEFORMATION
AT1070KSOME
IRRADIATED .
RODS
LB-5ASTEST'LB-3BUT
CONFIRMEXTRAPOLATION OF
PWRTESTRESULTSTOOTHER
FUELGEOMETRIESBRW(**)LOAD-BEFORE-HEAT;
DEFORMATION
AT1070K'Ί
FRESH
PRECONDITIONEDCOMPLEMENTARY TO
PHEBUS,PBF,NUR,
REBEKA,MRBTF
LB-6
LB-72UNSPECIFIED TESTSTOPERMITTESTINGOFREMEDIALMEASURESORANYOTHERSTUDYLATERENTIRING
HIGHPRIORITY ; * ■ .
(*)17X17TYPEGEOMETRY
(**)PROBABLY8X8TYPEGEOMETRY

TABLE2:SSTPCOREUNCOVERY/SEVEREFUELDAMAGETESTMATRIX
TESTSERIESA:INVESTIGATION OFEXTENTOFCLUSTERBLOCKAGE ANDFISSIONPRODUCTRELEASE
DUETOCLADDEFORMATION UNDER"SMALLANDMEDIUMBREAK"CONDITIONS
COMPLEMENTARY TOPBF.
TESTΝ°CLUSTER
TYPE INTENTIONTESTTERMINATION/FINALCONDITIONS
SFD-A-1PWR(*)CLUSTERUNCOVERY TOTCLADou1080-
1200K,THENCLADLOADINGAND
BALLOONING BYSLOWPRESSURE RAMP
ΔΡCLAD–0.005MPa/SCLUSTERRE-SUBMERGED AFTERWIDESPREAD
CLADRUPTURE
SFD-A-2PWR(*)ASSFD-A-1BUTWITHTCLAD 1350KAND
ΔΡCLADADJESTEDINRANGE0.005-0.05
MPa/STOGETDESIREDOXIDATION DURING
BALLOONINGCLUSTERRE-SUBMERGED AFTERWIDESPREAD
CIADRUPTURE '
SFD-A-3PWR(*)ASSFD-A-2BUTWITHTCLAD~1650KCLUSTER RE–SUBMERGED AFTERWIDESPREAD
CLADRUPTURE
*17x17TYPEGEOMETRY

,TABLE2(CONT.):SSTPCOREUNCOVERY/SEVEREFUELDAMAGETESTMATRIX
TESTSERIESB:INVESTIGATION OFEXTENTOFCLUSTERBLOCKAGE ANDFISSIONRPODUCTRET,EASE~ "WITHNOMOLTENCOMPONENT DUETORODFRAGMENTATION ANDRUBBLEBEDFORMATION :
COMPLEMENTARYTOPBF
TESTN°CLUSTER
TYPEINTENTION ' '-TESTTERMINATION/FINALCONDITIONS
SFD-B-1'
I,PWR(*)CLUSTERUNCOVERY TOTCLAD^1900KAT
ARATE0.3K/sTOFROVOKECLAD
RUPTUREAT~11OOKFOLLOWED WIDESPREAD
CLADOXIDATION ANDEMBRITTLE MENT.
PSYS^8MPa ...SLOWCOOL-DOWN TOAVOIDROD
FRAGMENTATION ANDRUBBLEBED
I '
SFD-B-2PWR(*)'■■>ASSFD-B-1FASTCOOL–DOWNTOPROVOKE ROD
FRAGMENTATION ANDRUBBLEBEDFORMATION
) *
SFD-B-3•PWR(*)ASSFD-B-1BUTWITHCLADRUPTURE
OCCURINGAT^1650K ;ASSFD-B-2
SFD-B-3BWR(**)CLUSTERUNCOVERYTO'TCLAD~1500KWITH
NORUPTURE(ΛPCLAD<θ);WIDESPREAD
CLADOXIDATION AT**130OK;SLOWCOOL-
DOWNTOTCLAD/V/600K.PSYS~4MPaPSYSDROPPEDFROM4TO1MPaTO.'PROVOKE
CLADSHATTERING FORTCLAD~600K.SL0W
COOL-DOWN CONTINUED .TOAVOIDFURTHER
RODFRAGMENTATION
*17x17TYPEGEOMETRY
"**PROBABLY8x8TYPEGEOMETRY

-„TABLE2(CONT.)SSTFCOREUNCOVERY/SEVEREFUELDAMAGETESTMATRIX
TESTSERIESC:INVESTIGATION OFEXTENTOFCLUSTERBLOCKAGE DUETOFORMATION OFA
MOLTENSOLUTIONOFU02INZIRCALLOY (ROD"CANDLING "),POSSIBLY
FOLLOWEDBYQUENCH ■INDUCEDRUBBLEBED;PWRTESTSCONFIRMATORY TOPBF,BWRTESTCOMPLEMENTARY -LioiaiuxrIU
TESTN°CLUSTER
,·TYPEINTENTION TESTTERMINATION/FINALCONDITIONS
SFD-C-1PWR(*) CLUSTERUNCOVERY TOTCLAD~2300KAT
ARATE~4K/sTOPROVOKECLADRUPTURE
AT-1100ΚFOLLOV/EPBYCLADOXIDATION,
MELTINGANDDISSOLUTION OFU02
(CANDLING)TOFORMFROZENSLAGAT
COOLERELEVATIONS .PSYS~8MPaSLOWCOOL–DOWNTOAVOIDRUBBLEBEDDUE
TOFRAGMENTATION OF'RODSANDSLAG
SFD-C-2FWR(*) .ASSFD-Ç-1', 'FASTCOOL–DOWNTOPROVOKERUBBLEBED
DUETORODANDSLAGFRAGMENTATION
SFD-C-3PV/R('*) ASSFD-C-1BUTWITHCLADRUPTURE
OCCURING AT~Ί650ΚAS.SFD-C-2,
SFD-C-1PWR(*).ASSFD-C-1BUTWITHFASTERUNCOVERY
..TOSIGNIFICANTLY EXCEED4K/sTCLAD
.RAMPTOINVESTIGATE MOREEXTENSIVE
CLADMELTING .· ·,.ASSFD-C-2.
SFD-C-5BV/R(**)ASSFD-C-1BUTWITHÄPCLAD<0TOGET
■CLADCREEP-DOWN INSTEADOFRUPTURE^-' *
POTENTIAL FORMORECLADMELTINGAND
ASSESSMENT OFBV/RSUBASSEMBLY MELT-
THROUGH - 'ASSFD-C-1 '
*17x17TYPEGEOMETRY
**PROBABLY8X8RTYPEGEOMETRY

TABLE2(CONT.):SSTPCOREUNCOVERY SEV1
TESTSERIESD:UNSPECIFIED TESTS
TESTN°SFD–D–1:)2UNSPECIFIED TESTSTO
TESTN°SFD–D–2:)CURRENTLY UNFORSEENFUELDAMAGETESTMATRIX
PERMITSTUDIESLATERENTERING HIGHPRIORITY .

M
\ ANNEX IT
Dilaterai Tcchnical InDlornontation Commi ttee
The contractiong Parties hereby set upaBilateral Technical
Implementation Committee toassure the execution ofthe
co-operation provided for inthis Arrangement .
Each Party will designate its members tothis Bilateral
Committee and 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 .

ν
ANNEX III
Thebasic 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 .6of ptheArrangement .
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 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 -: -
I
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 ofthetransient thermo­
hydraulic instrumentation ; . .
\
3.4 .assistance indesign ,testing and application ofthe transient rod system
3.5 .assistance 'inthe fission -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 ; v
4.2 .back-up for item 2âbove ;
4.2.1 .safety assessment ;
4.2.2 .test precalculations performed byIspra .

Α% .
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 ofthethree 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 .