Nuclear Engineering and Technology

  • 제33권1호
  • /
  • Pages.25-33
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  • 2001
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
권호 표지

Pin Power Reconstruction of HANARO Fuel Assembly via Gamma Scanning and Tomography Method

  • 발행 : 2001.02.01
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초록

To determine the pin power distribution without disassembling, HANARO fuel assemblies are gamma-scanned and then the distribution is reconstructed tv using the tomography method. The iterative least squares method (ILSM and the wavelet singular value decomposition method (WSVD) are chosen to solve the problem. An optimal convergence criterion is used to stop the iteration algorithm to overcome the potential divergence in ILSM. WSVD gives better results than ILSM , and the average values from the two methods give the best results. The RMSE (root mean square errors) to the reference data are 5.1, 6.6, 5.0, 6.5, and 6.4% and the maximum relative errors are 10.2, 13.7, 12.2, 13.6, and 14.3%, respectively. It is found that the effect of random positions of the pins is important. Although the effect can be accommodated by the iterative calculations simulating the random positions, the use of experimental equipment with a slit covering the whole range of the assembly horizontally is recommended to obtain more accurate results. We made a new apparatus using the results of this study and are conducting an experiment in order to obtain more accurate results.

키워드

참고문헌

  1. Chul Gyo Seo, 'Assemblywise Power Distribution Measurement,' HANARO Commissioning Test Report, TP-RPT-C-08, Korea Atomic Energy Research Institute (1998)
  2. Byung Chul Lee and Chul Gyo Seo, 'Thermal and Fast Neutron Reaction Rates in HANARO,' Proc. of the 5th Asian Symposium on Research Reactors, 1, 117, Taejon, Korea, May 29-31 (1996)
  3. Chul Gyo Seo, et al., 'Pin Power Reconstruction from the HANARO Fuel Assembly Gamma Scanning,' Proc. of the Korean Nuclear Society Autumn Meeting, Seoul, Korea, Oct. (1998)
  4. Chul Gyo Seo, 'Reconstruction of the Pin Power Distribution from the HANARO Fuel Assembly Gamma Scanning,' MS Thesis, Korea Advanced Institute of Science and Technology, Feb. (1999)
  5. N. J. McCormick, 'Inverse Radiative Transfer Problems: A Review,' Nucl. Sci. Eng., 112, 185 (1992)
  6. J. F. Briesmeister (Editor), 'MCNP-A General Monte Carlo N-Particle Transport Code,' LA-12625-M, Los Alamos National Lab. (1993)
  7. D. J. Whalen, et al., 'MCNP: Photon Benchmark Problems,' LA-12196 (1991)
  8. Eduardo A. Villarino, et al., 'HELIOS: Angularly Dependent Collision Probabilities,' Nucl. Sci. Eng., 112, 16 (1992)
  9. T. F. Budinger and G. T. Gullberg, 'Three Dimensional Reconstruction in Nuclear Medicine Emission Imaging,' IEEE Trans. Nucl. Sci., NS-21, 2 (1974)
  10. N.Z. Cho and C.J. Park, 'A Wavelet-Based Image Reconstruction in Transmission Computed Tomography,' Proc. of 1998 ANS Radiation Protection and Shielding Division Topical Conference, 2, 141, Nashville, U.S.A., Apr. (1998)
  11. C.J. Park and N.Z. Cho, 'Image Reconstruction in Emission Computed Tomography via Multigrid Wavelet-Based Natural Pixel Method,' Proc. Int. Conf. on the Physics of Nuclear Science and Technology, Long Island, New York, Oct. (1998)
  12. G. Beylkin, et al. 'Fast Wavelet Transforms And Numerical Algorithms,' Comm. Pure. Appl. Math., 43, 141 (1991) https://doi.org/10.1002/cpa.3160440202