Abstract
The double ended failure of the piping system of the HDR-testing facility is described. The failure occurred in the transition region of a pipe reducer near the pressurizer. Theoretical (FE-analysis) and experimental studies (metallography, fractography) yield the conclusion that one main reason for the failure is strain induced corrosion (stable crack extension in corrosive environment). High strains resulted from internal pressure of 110 bar (operational pressure of the test plant) and from the highly underdimensioned wall thickness of the reducer due to a manufacturing deficiency. Corrosive environment in the loop is artificially prepared by injection of oxygen to 8 ppm. The conductivity of the medium in the loop amounted to 25 μS. Some crack growth and fracture patterns as in HDR-failure surfaces were simulated on CT-specimens in the MPA-autoclave testing facilities.
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