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Thermal fatigue evaluation of piping system "tee"- connection

Objective

Thermal fatigue is a recurring problem when LWR plants become older and life time extension activities are initiated. In general, the common thermal fatigue issues are understood and can be controlled by plant instrumentation systems. However, the Civaux 1 and other incidents indicate that certain piping system Tee's are susceptible to turbulent temperature mixing effects that cannot be adequately monitored by common thermocouple instrumentations, putting the reliability of integrity evaluation procedures in doubt. THERFAT proposes to review field data and perform advanced thermohydraulic flow simulations and stress and fracture analysis. Critical elements of the procedure will be investigated by targeted verification tests. Proposals will be made for improved thermal fatigue assessment procedures, screening criteria and for establishing a European Methodology on Thermal Fatigue.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

E. ON KERNKRAFT GMBH
Address
Tresckowstrasse 5
30457 Hannover
Germany

Participants (15)

CINAR LTD.
United Kingdom
Address
Elvaston Place 11
SW7 5QG London
COMMISSARIAT A L'ENERGIE ATOMIQUE
France
Address
Cea Cadarache
13108 St.paul Les Durance
COMMISSION OF THE EUROPEAN COMMUNITIES
Netherlands
Address
Westerduinweg 3
1755 ZG Petten
ELECTRICITE DE FRANCE
France
Address
Avenue Dutriévoz 12-14
69628 Villeurbanne
ENDESA GENERACION S.A.
Spain
Address
Principe De Vergara 187
28002 Madrid
FORTUM NUCLEAR SERVICES OY
Finland
Address
Keilaniementie 1
00048 Espoo
FRAMATOME ANP GMBH
Germany
Address
Berlinerstrasse 295
63067 Offenbach (Am Main)
FRAUNHOFER GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG E.V.*
Germany
Address
Woehlerstrasse 11
79108 Freiburg (In Breisgau)
JOZEF STEFAN INSTITUTE
Slovenia
Address
Jamova 39
1001 Ljubljana
SIEMPELKAMP PRUEF- UND GUTACHTER-GESELLSCHAFT MBH
Germany
Address
Am Lagerplatz 6A
01072 Dresden
SOCIETE FRAMATOME
France
Address
Tour Framatome
92084 Paris La Defense
STAATLICHE MATERIALPRUEFUNGSANSTALT
Germany
Address
Pfaffenwaldring 32 Universität Stuttgart
70569 Stuttgart
TECHNICAL RESEARCH CENTRE OF FINLAND
Finland
Address
3,Kemistintie 3
02044 Espoo
TECNATOM S.A.
Spain
Address
1,Avenida Montes De Oca 1
28709 San Sebastian De Los Reyes - Madrid
VUJE TRNAVA INC - ENGINEERING, DESIGN AND RESEARCH ORGANISATION
Slovakia
Address
Okruzna 5
918 64 Trnava