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The division's objectives are to promote the advancement of knowledge and understanding of the fundamental physical phenomena characterizing nuclear reactors and other nuclear systems. The division encourages research and disseminates information through meetings and publications. Areas of technical interest include nuclear data, particle interactions and transport, reactor and nuclear systems analysis, methods, design, validation and operating experience and standards. The Wigner Award heads the awards program.
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2024 ANS Annual Conference
June 16–19, 2024
Las Vegas, NV|Mandalay Bay Resort and Casino
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ANS Standards Committee publishes joint ASME/ANS standard for Level 1/large early release frequency PRA
ANSI/ASME/ANS RA-S-1.1-2024, Standard for Level 1/Large Early Release Frequency Probabilistic Risk Assessment for Nuclear Power Plant Applications, has been published by the American Nuclear Society. The document, which is a joint standard developed with the American Society of Mechanical Engineers by the ANS/ASME Joint Committee on Nuclear Risk Management, received the approval of the American National Standards Institute on February 29, 2024, and was issued on March 15, 2024.
Katsuhei Kobayashi, Samyol Lee, Shuji Yamamoto, Toshihiko Kawano
Nuclear Science and Engineering | Volume 146 | Number 2 | February 2004 | Pages 209-220
Technical Paper | doi.org/10.13182/NSE04-A2404
Articles are hosted by Taylor and Francis Online.
The neutron capture cross section of 99Tc has been measured relative to the 10B(n,) standard cross section by the neutron time-of-flight (TOF) method in the energy range of 0.005 eV to 47 keV using a detection assembly of Bi4Ge3O12 scintillators and a 46-MeV electron linear accelerator at the Kyoto University, Research Reactor Institute. The relative measurement has been normalized at 0.0253 eV to the reference value (22.9 ± 1.3 b) measured by Harada et al. The energy-dependent experimental data and the evaluated data in ENDF/B-VI, JENDL-3.2, JENDL-3.3, and JEF-2.2 are in general agreement with the current measurement. In particular, the JENDL-3.3 data, which have been released recently, show better agreement with the measurement in the lower-energy region.The resonance parameters at 5.6 and 20.3 eV have been analyzed by the KALMAN system using the current TOF data. The resonance integral calculated with the parameters obtained is derived to be 330 ± 19 b, which is close to the data obtained from JENDL-3.3 and evaluated by Mughabghab, although the resonance integrals from JENDL-3.2, ENDF/B-VI, and JEF-2.2 are smaller by ~6 to 8% than the current value. The resonance integral data measured by Harada et al. is larger by ~20%.