OUT-OF-PILE BALLOONING AND BURSTING TESTS ON ZIRCALOY CLADDING RODS WITH DIRECT AND INDIRECT HEATING
An experimental programme of ballooning tests on Zircaloy cladding is described, which was designed to demonstrate the variability of failure strain with temperature, heating method and surface heat transfer. The results obtained have been compared with predictions from the Rodswell code which was written specifically to model the interaction between strain and heat transfer, now thought to be the major factor in the ballooning of indirectly heated alpha phase Zircaloy cladding. Fuel rod simulators were heated either directly or indirectly by internal heaters and cooled by flowing steam within a shroud which could be heated also. Constant pressure burst tests were performed at either constant temperature or heating rate. By varying the coolant flow, shroud heating and rod pressure it was possible to cover the range of heat transfer and failure times of interest in both small and large break LOCAs. The results confirm some but not all expectations. However, they do reinforce the prediction that large- strain axially extended balloons are not likely under real accident conditions.
Bibliographic Reference: EUR 10073 EN (1985) FS, 230 P., BFR 700, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989124009500 / Last updated on: 1987-01-01
Available languages: en