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Load bearing capacity of a degraded piping system under simulated earthquake loads and operating conditions

: Diem, H.; Malcher, L.; Steinhilber, H.

American Association for Structural Mechanics in Reactor Technology -SMIRT-, Los Angeles:
Structural Mechanics in Reactor Technology. Vol.G. Fracture-Mechanics and Non-Destructive Evaluation
Los Angeles, 1989
ISBN: 0-9623306-0-4
pp.311-316 : Abb.,Lit.
International Conference on Structural Mechanics in Reactor Technology (SMIRT) <10, 1989, Anaheim/Calif.>
Conference Paper
Fraunhofer LBF ()
Erdbebensimulation; Reaktorsicherheit; Rißfortschritt; Rohrleitung

Earthquake-like loads under operating conditions of a pipe system incorporating predamaged components allowed reserves in load carrying capacity to be determined even under conditions of excessive and repeated loading. In an integral test when the two initial crack depths were a/t 0.4 and a/t = 0.7, a straight pipe section with a circumferential defect on at least seven occasions in each case withstood the loads exerted by a so-called 600% "safe shutdown earthquake," in which the strain levels at the site of the defect attained a magnitude of 1%, which is in excess of the permissible limit for integral piping systems. It was not until the eight repetition of the 600% SSE that failure by leakage occurred. In an analogous test program involving an elbow weakened by a number of longitudinal cracks, the initial crack depths of a/t = 0.17 and a/t = 0.4 were subjected to ten cycles in the first case and to one cycle of a 800% SSE in the second case. During a transient condition of this type, which brought about strains in the region of 5 10 high minus 3 m/m to 10 10 high minus 3 m/m, there was no failure of the component.