Triga Mark-II Reaktor
The research reactor of the Institute of Atomic and Subatomic
Physics of the University of Technology Vienna is a reactor type TRIGA
Mark II whose biological shield is formed in the lower half of a 2 m
thick weakly reinforced barite concrete and in the upper half of a 1 m
thick setup of normal concrete. During years of operation, numerous
cracks have arisen in the shielding concrete. Experimental, analytical and numerical investigations included the computation of the temperature profile and the associated stress state due to the temperature difference between the reactor – core and the exterior of the shielding concrete as well as the heating in consequence of the gamma emission. The assessment of the damage potential generally was performed by means of the stress spectrum [1,2].
Specific fracture mechanics investigations for cementitious materials (crack development, materials testing) at that time were not yet fully developed and therefore have not been carried out - it will be verified in this review.
ABAQUS 6.13 CONCRETE DAMAGED PLASTICITY
Max T = 41.20o C Min T = 18o C Max T = 41.33o C Min T = 21.4 o C
Max σyy = + 8.31 MPa Max σyy = + 6.96 MPa
Damage Pattern
[1] H.Linsbauer, P.Maydl;
Vergleich zweier Methoden zur Berechnung der
Wärmespannungen in
dickwandigen Reaktorbehältern,
Bauingenieur 55,
(1980) 131-134
[2] H.
Böck, H.Linsbauer,P.Maydl; Zur Frage der Rißbildung im
Abschirmbeton eines
Forschungsreaktors
des Typs TRIGA Mark II, Atomkernenergie, 34(1979), 92-93