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Wren, J. C.*; Royen, J.*; Ball, J.*; Glowa, G.*; Rydl, A.*; Poletiko, C.*; Billarand, Y.*; Ewig, F.*; Funke, F.*; Zeh, P.*; et al.
NEA/CSNI/R(2000)6/Vol.1, Vol.2, 174 Pages, 2000/04
The main goal of International Standard Problem (ISP) is to increase confidence in the validity and accuracy of the tools, which were used in assessing the safety of nuclear installations. Moreover, the exercises enable code users to gain experience and demonstrate their competence. The ISP No. 41 exercise, computer code exercise based on a Radioiodine Test Facility (RTF) experiment on iodine behavior in containment under severe accident conditions, is one of such ISP exercises. The codes used by the participants were LIRIC (AECL), MELCOR-I (SNL), IMPAIR (PSI, Siemens, GRS, and JAERI) and IODE (CIEMAT, IPSN and NRIR). This report presents a detailed description of the RTF tests used for the exercise, a brief description of the models/codes used and the modelling process and the description and interpretation of the results.
Ball, J.*; Glowa, G.*; Wren, J.*; Rydl, A.*; Poletiko, C.*; Billarand, Y.*; Ewig, F.*; Funke, F.*; 日高 昭秀; Gauntt, R.*; et al.
NEA/CSNI/R(99)7, p.311 - 325, 1999/00
The ISP No.41 exercise resulted from a recommendation at the fourth iodine chemistry workshop held at PSI, Switzerland in 1996 for an International Standard Problem on iodine behavior models. The test selected for the comparison was a Radio Test Facility experiment. It was conducted in a stainless steel vessel at 25C and at a dose rate of 1.4 kGy/h to evaluate the effect of pH on irradiated aqueous solutions containing CsI. This paper discusses the results of ISP 41 exercise, with a primary focus on the evaluation and comparison of calculated results, and what they demonstrate about the aqueous iodine reaction subset within each model. The paper will also discuss the relative importance of mass transfer, surface adsorption and aqueous chemistry, and the sensitivity of each of the models to these phenomena. Finally, it will assess the applicability of the ISP 41 exercise to qualitative validation of the iodine models, and provide recommendations for continuing model evaluation.