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DOI: 10.1615/ICHMT.1995.RadTransfProcHeatMassTransfSevNuclReactAcc.460

A. V. Jones
CEC Joint Research Centre, Ispra, Italy

I. Shepherd
Joint Research Centre, Ispra, Italy

M. Delaval
European Commission, Joint Research Centre, Ispra (Va) Italy

J. Sangregorio
European Commission, Joint Research Centre, Ispra (Va) Italy

S. Treta
European Commission, Joint Research Centre, Ispra (Va) Italy


ESTER is a system of codes developed in various laboratories of the EU and elsewhere assembled in host framework for the purpose of calculating LWR severe accident phenomena both in reactors and in small-scale experiments such as Phebus-FP. Codes being incorporated as ESTER modules need to be changed only minimally as to their internal working, but are constrained to receive their input data from and supply their output data to an in-core database managed by the framework. This arrangement practically eliminates unwanted "crosstalk" between modules, and allows all modules access to a set of common facilities including a user interface, an input data reader and checker, printed and graphical output facilities (including an on-line display) and restart and post-processing tools. Recently an official version of ESTER has been released incorporating a long list of modules, together with test cases, installation procedures for various machines and extensive documentation. The paper describes the facilities of ESTER, the modules which it contains, and certain powerful combinations of modules which are offered in the code, and then goes on to give a brief survey of ESTER applications, illustrated by sample results. The applications range from reactor sequence calculations (comparison with MELCOR) to Phebus pre-and post-test analyses and calculations of separate effects experiments such as FALCON.
The paper concludes with some general remarks on the experience gained with the construction of a large code system using components from several sources.

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