Application of Different Nuclides in Retrospective Dosimetry

Konheiser, J.; Mittag, S.; Viehrig, Hans-Werner; Gleisberg, B.

doi:10.1520/jai103925

Journal of ASTM International

2012

DOI: 10.1520/jai103925

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Application of Different Nuclides in Retrospective Dosimetry

J. Konheiser

S. Mittag

Hans-Werner Viehrig

et al.

Abstract: The activities of nuclides produced via the neutron irradiation of reactor pressure vessel (RPV) steel are used to validate respective fluence calculations. Niobium, nickel, and technetium isotopes from RPV trepans of the decommissioned NPP Greifswald (VVER-440) have been analyzed. The activities were determined by TRAMO (Monte-Carlo) fluence calculations, newly applying 640 neutron-energy groups and ENDF/B7 data. Relative to earlier results, fluences up to 20 % higher have been computed, leading to somewhat b… Show more

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Cited by 6 publications

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Estimation of weight window parameters based on recursive Monte Carlo approach for reactor shielding problems

Yadav,

Rachamin,

Konheiser

et al. 2024

Annals of Nuclear Energy

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Estimation of weight window parameters based on recursive Monte Carlo approach for reactor shielding problems

Yadav,

Rachamin,

Konheiser

et al. 2024

Annals of Nuclear Energy

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An automated weight window generator based on the recursive Monte-Carlo method for use in MC shielding calculations

Yadav,

Baier,

Konheiser

et al. 2024

EPJ Web Conf.

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MCNP code provides numerous variance reduction techniques that are mainly used to optimize the analog Monte Carlo simulations. These techniques can reduce the statistical uncertainty of the simulation results while minimizing computational costs. Weight window is one such technique that is commonly used to optimize shielding calculations. However, for complex shielding problems such as deep penetration, the existing MCNP weight window generator is not efficient enough to generate the appropriate weight parameters for the weight window in a single run. To address this issue, an automated algorithm was developed using the code TRAWEI, which is based on recursive Monte Carlo methodology. The TRAWEI code can generate suitable weight values in a single run with less calculation time. This paper focuses on the verification of TRAWEI-generated weights using a simplified cask model. Further, the results of MCNP simulation using TRAWEI-generated weights are compared with those using weights generated by an existing MCNP weight window generator.

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Further development, validation and verification of the Monte-Carlo code TRAMO on ex-vessel experiments of the Greifswald NPP

Baier,

Konheiser,

Pönitz

2024

EPJ Web Conf.

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TRAMO is a Monte Carlo code which is specially designed for geometries of nuclear power plants. In recent years, TRAMO has undergone a number of technical developments. In addition to the conversion to modern Fortran, standardized models for VVER-440 and VVER-1000 for the evaluation of monitor experiments on the surface of the reactor pressure vessel were developed, and the corresponding pre- and post-processing was automated. The new TRAMO version is continuously validated and verified. Here we present comparisons with experimental data from unit 1 of the Greifswald nuclear power plant and with MCNP calculations. Earlier calculations with TRAMO showed good agreements in the middle region of the reactor core, but significant deviations outside. A possible explanation is the wrong documentation of the experimental data – especially the heights of the monitors. Assuming a downward shift of the monitor positions by about 24cm, experimental and calculated data show very good agreement.

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Application of Different Nuclides in Retrospective Dosimetry

Cited by 6 publications

References 3 publications

Estimation of weight window parameters based on recursive Monte Carlo approach for reactor shielding problems

Estimation of weight window parameters based on recursive Monte Carlo approach for reactor shielding problems

An automated weight window generator based on the recursive Monte-Carlo method for use in MC shielding calculations

Further development, validation and verification of the Monte-Carlo code TRAMO on ex-vessel experiments of the Greifswald NPP

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