SYSTEM PERFORMANCE ASSESSMENTS FOR RADIOACTIVE WASTE DISPOSAL
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Proceedings of the NEA Workshop on SYSTEM PERFORMANCE ASSESSMENTS FOR RADIOACTIVE WASTE DISPOSAL PARIS 22nd - 24th October 1985 NUCLEAR ENERGY AGENCY ORGANISATION FOR ECONOMIC CO-OPERATION AND DEVELOPMEN1 FOREWORD Currently one of the most important areas of radioactive waste manage- ment is research and development directed towards assessments of the perfor- mance of potential radioactive waste disposal systems. It is primarily for this reason that, under the guidance of its Radioactive Waste Management Committee (RWMC), the OECD Nuclear Energy Agency has devoted a considerable amount of effort towards the further development of systems performance assessment methodologies. The first NEA workshop on this topic, which was held in 1982, critically reviewed the status of performance assessment meth- odologies in both their generic and site-specific aspects in order to provide guidance for the further development of predictive mathematical models and also to facilitate comparison of different approaches to modelling and bet- ween safety assessments of alternative disposal options. The resultant infor- mal report* identified the various approaches adopted in OECD Member countries, highlighted some of the problems foreseen in carrying out assessments and made recommendations on future needs. In the interim since the first workshop, new challenges have arisen which stem from a concerted effort throughout the OECD area to develop and apply performance assessment methodologies, including some full scale assess- ments of potential disposal systems within several Member countries. A small group of consultants was assembled to consider these developments and, to- gether with the NEA Secretariat, develop the most appropriate theme for a second NEA workshop. As a result, it was considered that due to the number of different approaches being followed, a major problem was how to rationalise all the various elements involved in carrying out performance assessments. This rationalisation was necessary in order to help generate confidence in predictions of the performance of waste disposal systems. It was therefore agreed that the workshop would examine the links or interrelationships bet- ween the major components of performance assessments, in particular the following : - the link between performance assessments and regulatory requirements ; - the links between mathematical models used in performance assess- ments ; - the link between model development and field/laboratory observations. These proceedings reproduce the papers presented at the Workshop to- gether with a summary and conclusions prepared by the NEA Secretariat in con- junction with rapporteurs appointed for each session and the Chairman. The opinions expressed are the responsibility of the authors and it no way commit the Member countries of the OECD. * This report is available on request from the OECD/NEA Secretariat, 38 boulevard Suchet, 75016 Paris, France.