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Extensive Validation of the Code FUROM Based on the IFPE ...

Extensive Validation of the Code FUROM Based on the IFPE ...

The code

The code calculations are stored in HMS (HERMES) files as well, in a structure more or less identical to that ong>ofong> ong>theong> experimental data files: in addition to ong>theong> previously described INPUT and HIST catalogs, ong>theong> ong>FUROMong> control parameters and ong>theong> results ong>ofong> ong>theong> calculations are also loaded into ong>theong> file. They are stored in a catalog called CALC, but ong>theong> results corresponding to ong>theong> actual measured data are also deposited in a catalog named MEAS for easier comparison. 6. Automated ong>Validationong> Once ong>theong> experimental data are loaded into ong>theong> standardised FBDF database (i.e. into HMS files), a dedicated program kit performs ong>theong> validation. First, this processing program kit creates ong>theong> ong>FUROMong> inputs from ong>theong> HMS files: it eiong>theong>r adjusts ong>theong> ong>FUROMong> control parameters (i.e. chooses ong>theong> appropriate models) according to ong>theong> characteristics ong>ofong> ong>theong> experiment or includes ong>theong> control parameters given by ong>theong> user. Then it initiates ong>FUROMong> runs, stores ong>theong> calculations in separate HMS files and compares ong>theong> results with ong>theong> measurements. Fig. 2 demonstrates ong>theong> procedure leading from ong>theong> IFPE data files to ong>theong> ong>FUROMong> input and furong>theong>r to ong>theong> validation ong>ofong> ong>theong> calculations. Note that ong>theong> only steps specific to ong>theong> ong>FUROMong> code are those where ong>theong> ong>FUROMong> input is created and where ong>theong> ong>FUROMong> output is stored: ong>theong> FBDF system is a general database suitable for ong>theong> validation ong>ofong> any fuel behaviour code. 7. Problems In order to be as comprehensive as possible, ong>theong> IFPE database contains all ong>theong> available information concerning ong>theong> given experiment. Unfortunately this ong>ofong>ten leads to contradictions and inconsistencies within a data set (see Table 2 copied from Reference [5]). The units are also sometimes wrong. Some data are only available in graphical form. Fig. 3 demonstrates an example where ong>theong> axial diameter readings ong>ofong> 5 rods are superimposed in one graph ([6]). It is a difficult and time consuming task to separate ong>theong> data ong>ofong> ong>theong> rods and read ong>theong> average for each axial section. However, ong>theong>se problems have been overcome and ong>theong> data ong>ofong> ong>theong> above mentioned 5 WWER data sets have been loaded into ong>theong> FBDF. In ong>theong> doubtful cases ong>theong> most consistent values have been chosen, bearing in mind that ong>theong> uncertainties ong>ofong> ong>theong> input data will be taken into account in ong>theong> validation procedure. 8. Example The IFPE data set Kola-3 consists ong>ofong> ong>theong> data ong>ofong> two assemblies, both ong>ofong> which have already been loaded into ong>theong> FBDF. Assembly 222 contains 13 post test fission gas release measurements. The processing program kit created ong>theong> ong>FUROMong> inputs from ong>theong> 13 HMS files (which also contain ong>theong> FGR data), ong>theong> runs were performed and ong>theong> results were stored in separate HMS files. Only ong>theong> comparison ong>ofong> ong>theong> code calculations with ong>theong> experimental data was manual – at ong>theong> moment. Fig. 4 exhibits ong>theong> measured data and ong>theong> values calculated by ong>FUROMong> as a function ong>ofong> ong>theong> maximum axial burn-up. The burn-up values provided in ong>theong> IFPE database are 3% higher than those calculated on ong>theong> basis ong>ofong> ong>theong> given geometry and density data, ong>theong> calculated FGR is ong>theong>refore plotted against ong>theong> calculated (lower) values ong>ofong> ong>theong> burn-up. Taking this into account, ong>theong> agreement is good. Furong>theong>r evaluation and analysis will follow as ong>theong> processing program kit becomes available.

9. Results and Furong>theong>r Work A new database with a uniform structure, named Fuel Behaviour Data Files (FBDF) and operated under ong>theong> HERMES database management system, has been devised and created. The database has so far been filled up with ong>theong> data ong>ofong> more than 150 individual WWER rods. A processing program kit has been designed and implemented for ong>theong> purpose ong>ofong> data storage and access, as well as ong>theong> automatic running ong>ofong> ong>theong> ong>FUROMong> code. The modules for ong>theong> comparison and statistical analysis ong>ofong> ong>theong> results will be ready in ong>theong> near future. A sophisticated concept has been prepared to obtain ong>theong> uncertainty ong>ofong> ong>theong> determination ong>ofong> measurable parameters (FGR, centreline temperature) and nonmeasurable parameters (hoop stress) [7]. The sensitivity to ong>theong> errors ong>ofong> ong>theong> input parameters and to ong>theong> values ong>ofong> model parameters is taken into account. In ong>theong> near future an automated, large-scale validation procedure ong>ofong> ong>theong> ong>FUROMong> code will be conducted. Anoong>theong>r future task is to include PWR rods and transient tests in ong>theong> database, with special attention to ong>theong> experiments chosen for ong>theong> FUMEX-III exercise. The FBDF and ong>theong> methodology are in place, ong>theong>y can possibly be extended to oong>theong>r fuel behaviour codes. 10. Acknowledgements The present work has been supported by Paks NPP. 11. References [1] Á. Griger, J. Gadó: Models ong>ofong> ong>theong> ong>FUROMong>-1.3 ong>Codeong>. AEKI-FRL-2007-719- 1.3-01, 2007 (in Hungarian). [2] E. Sartori, J. Killeen, J. Turnbull: International Fuel Performance Experiments (IFPE) Database. OECD-NEA, 2008, http://www.nea.fr/html/science/fuel/ifpelst.html [3] C. Oña: HERMES 3.2 – Fortran 90 Version User Manual. SSP-01/223, Studsvik Scandpower, 2001. [4] M. Pihlatie: Basic Data ong>ofong> Fuel Base Irradiated in Loviisa and Tested in Studsvik, Halden, LO-2685, LO1-K919-628, 16 November 2004. [5] S.E. Lemehov, A.V. Smirnov, V.A. Tsibulya: Kola-3 High Burn-up Fuel ong>Validationong> Tests FA-198 and FA-222. HPR347/3, OECD Halden Reactor Project, 1996. [6] A.V. Smirnov, B.A. Kanashov, S.V. Amosov: Geometrical parameters ong>ofong> ong>theong> fuel rod claddings ong>ofong> ong>theong> VVER-440 after 4 and 5 fuel cycles and VVER-1000 after 3 and 4 fuel cycles ong>ofong> operation. Technical Committee Meeting on Fuel behaviour under transient and LOCA conditions (Halden, Norway, 10 September - 14 September 2001) [7] A. Keresztúri, I. Panka, Á. Griger: Concept for ong>theong> Determination ong>ofong> ong>theong> Uncertainty Factors ong>ofong> ong>theong> ong>FUROMong> ong>Codeong>, AEKI-FL/RAL-2008-702-01-01, 2008 (in Hungarian).

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