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A set of formulas for conservatively computing the fuel rod cladding strains caused by short and intense energy pulses is presented. Such pulses may be the consequence of a RIA. The formulas are based on the theory of stresses and deformations of tubes loaded by internal pressure and stressed beyond the elastic limit. The known solutions of this theory are applied to compute the cladding strains due to the intense interaction between fuel and cladding during a RIA. Simple and easy to evaluate expressions for the strains are obtained. They enable to quickly assess the impact of any energy pulse for any burn-up state. The actual burn-up state of the fuel rod at the moment in which the occurrence of a RIA shall be simulated is described by only three data. These data can be calculated in an enveloping sense in advance and then be used to study energy pulses of any intensity. Besides the cladding strains induced by the fuel-cladding interaction the significance of the gas pressure in the rod and of gas swelling for the cladding strains is also addressed.

Simple formulas for conservatively calculating the fuel rod cladding strains due to RIA