Assessment of SCDAP by analysis of in-pile experiments; power burst facility - severe fuel damage scoping test

The paper presents severe fuel damage analysis using the SCDAP code. Phenomena modelled include heat transfer, the Zircaloy-steam reaction, fuel and clad relocation, and bundle collapse. The main objective is to describe a comparison of a SCDAP prediction of the Scoping Test with experimental results. Particular emphasis will be paid to the main interesting feature, the mechanism behind the spontaneous clad temperature excursion involving extensive oxidation of the Zircaloy. The paper concludes with an assessment of the SCDAP models, on the basis of the experimental comparison. (orig.)