The fourth meeting of the CSNI Working Group on Analysis and Management of Accidents (GAMA) was held in London, UK. The meeting reviewed the entire GAMA programme of work, discussing the progress of current activities and identifying future tasks. Several international standard problems (ISP) were completed in 2002. Proposals for new work in the areas of best-estimate calculations and the application of computational fluid dynamics (CFD) codes to nuclear reactor safety problems will be submitted to the CSNI. More attention will be devoted to the issues raised by the clogging of intake strainers for containment spray water in boiling water reactors and pressurised water reactors. An integrated plan for the future work of GAMA has been agreed.

A GAMA expert group met in Cologne, Germany to discuss the development of a phenomena-based validation matrix for ex-vessel (containment) codes, and to develop an action plan for the next few years.

An interim meeting to discuss the preliminary results of the second phase of the follow-up to the International Standard Problem (ISP) No. 41 exercise was held in Ottawa, Canada. The second phase of the follow-up addressed blind post-test calculations on two caractérisation de l'iode moléculaire dans un accident nucléaire (CAIMAN) and two radioiodine test facility (RTF) experiments.