ILT15 - A Computer Program for Evaluation of Accelerated Leach Test Data of LLW in the Hungarian NPP Paks

Pátzay, György; Zsille, Ottó; Csurgai, József; Nenyei, Arpad; Feil, Ferenc; Vass, Gyula

doi:10.3311/ppch.11714

Cited by 4 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At the Department of Chemical and Environmental Process Engineering (earlier Department of Chemical Technology) of BME we have developed several programs and models for industrial use. As we discussed earlier, we constructed models and computer programs for the simulation of scaling in multicomponent geothermal water (program GEOPROF [8]), a model for the simulation of leaching processes from solid radioactive waste samples (ILT15, ILT20) [9,10], and models for the simulation of multicomponent sorption processes in packed columns [11,12], and stirred bath [13]. We have also developed a simulation program to describe multicomponent ion exchange kinetics according to the Nernst-Planck model in columns [14].…”

Section: Simulation Of Ion Exchange Breakthrough and Elution Curves 2...mentioning

confidence: 99%

Research in Industrial Use of Ion Exchange and Simulation

Pátzay,

Csonka

2023

Period. Polytech. Chem. Eng.

View full text Add to dashboard Cite

We investigated the industrial use of ion exchange technology as well as the modeling of fixed bed, multicomponent ion exchange processes. In this paper we report on both fields of this research. We have developed a complex technology for the selective separation of the long-live radionuclides and the partial recycling of boric acid from radioactive evaporator bottom residue. A wastewater treatment system has been developed by using a cesium-selective inorganic ion exchanger. The selective separation of 137Cs, 134Cs from high salt concentration and strongly alkaline evaporator bottom residue in Paks NPP has a volume reduction factor of about 3500–6500 at the value of the decontamination factor DF > 100, for the samples of four evaporator bottom residue tanks of the NPP. Some important classes of ion exchangers do possess uniform internal pore structures and bring all parts of the solíd structure into much closer contact with the liquid. Such materials are porous organic resins. For these types of exchangers, we have modified Mansour's multicomponent adsorption model and developed a computer program to describe multicomponent breakthrough, cocurrent, and counter-current elution curves for ion exchangers. In addition, we have developed a subroutine for the calculation of multicomponent ion exchange kinetics according to Nernst-Planck equation and successfully tested it. This subroutine will be added to the multicomponent ion exchange breakthrough and elution simulation program to have a real multicomponent ion exchange simulation program. In this paper we report about these research results too.

show abstract

Section: Simulation Of Ion Exchange Breakthrough and Elution Curves 2...mentioning

confidence: 99%

Research in Industrial Use of Ion Exchange and Simulation

Pátzay,

Csonka

2023

Period. Polytech. Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…The program was designed to be used as a tool for performing the calculations necessary to analyze leach test data, a modelling program to determine if diffusion is the operating leaching mechanism (and, if not, to indicate other possible mechanisms), and a means to make extrapolations using the Diffusion Models. The ILT15 program contains four mathematical models that can be used to represent the data [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

ILT20 – an Upgraded Computer Program for Evaluation of Accelerated Leach Test Data of LLW in the Hungarian NPP Paks

Pátzay

Nyőgér

Zsille³

et al. 2021

Period. Polytech. Chem. Eng.

Self Cite

View full text Add to dashboard Cite

Computer Program ILT15 was earlier developed to accompany a new leach test for solidified radioactive waste forms in the Hungarian NPP Paks. The program was designed to be used as a tool for performing the calculations necessary to analyze leach test data, a modelling program to determine if diffusion is the operating leaching mechanism (and, if not, to indicate other possible mechanisms), and a means to make extrapolations using the diffusion models. The program uses computational algorithm of ASTM C1308 standard. Now we have developed another computational algorithm based on a Partial Differential Equation (PDE) of a cylindrical specimen, solved the PDE by a Crank-Nicolson Finite Difference Method (FDM) and calculated by integration the eluted amount of a given component in time. The new solution more accurate method was integrated into the existing ILT15 computer program and the resulting new ILT20 program is able to calculate the Incremental/Cumulative Fraction Leached IFL/CFL) either by ASTM or PDE numerical solution methods.ILT20 program is written in C++ in the Borland C++ Builder programming environment. A detailed description of application of this upgraded modelling computer program is given.

show abstract

“…• special laboratory radiation assignments, where measures of only one or just some isotopes with non-superpositioning, significant peaks are done [2,3], • in-situ measures, where easily and rapidly recordable gamma spectra can provide vital information on hotspots, main isotopes determining the field of radiation and specification of suitable places for sampling, In addition to these, the scintillation technique in military practice is still dominant in the following cases:…”

Section: Introductionmentioning

confidence: 99%

Temperature Dependence of NaI(Tl) Radiation Scintillation Detectors’ Characteristics

Csurgai

Padányi

Földi

2020

AiMT

View full text Add to dashboard Cite

Scintillators belong to the oldest types of radiation detectors. Nowadays, for spectrometric purposes the use of semiconductive detectors is more common, but scintillation detectors are still in use for various specific measurement purposes. We have investigated the dependence of a gamma spectrum measured by NaI(Tl) scintillation detector on temperature changes. We examined the need of energy or efficiency recalibration and software compensation. Due to temperature dependence, scintillation detectors require energy recalibration before environmental and outdoor measurements or before the use of etalon sources for obtaining spectrum for follow-up calibration. We have elaborated on a simple method for energy recalibration of scintillation detectors at different temperatures. This method was converted into an algorithm and it can be either burned into instrument EPROM or used in software processing.

show abstract

ILT15 - A Computer Program for Evaluation of Accelerated Leach Test Data of LLW in the Hungarian NPP Paks

Cited by 4 publications

References 0 publications

Research in Industrial Use of Ion Exchange and Simulation

Research in Industrial Use of Ion Exchange and Simulation

ILT20 – an Upgraded Computer Program for Evaluation of Accelerated Leach Test Data of LLW in the Hungarian NPP Paks

Temperature Dependence of NaI(Tl) Radiation Scintillation Detectors’ Characteristics

Contact Info

Product

Resources

About