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Report No.
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Influence of initial conditions on rod behaviour during boiling crisis phase following a reactivity initiated accident

Georgenthum, V.*; Sugiyama, Tomoyuki 

In the frame of their research programs on high burnup fuel safety, the IRSN and JAEA performed a large set of tests devoted to the study of PWR fuel rod behaviour during Reactivity Initiated Accident (RIA) respectively in the CABRI and NSRR. The test conditions are different in terms of coolant nature, temperature and pressure. In the CABRI reactor, tests were performed so far with sodium coolant at 280 $$^{circ}$$C and 3 bar. In the NSRR most of the tests were performed with stagnant water at 20 $$^{circ}$$C and atmospheric pressure, but recently a new high temperature high pressure capsule has been developed which allows up to 280 $$^{circ}$$C and 70 bar. This paper discusses the influence of test conditions on rod behaviour during boiling phase, based on test results and SCANAIR code calculations. The study shows that when the boiling crisis is reached, the initial inner and outer rod pressure have an essential impact on the clad strain and possible ballooning.

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