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Ahn, Sangjoon
UNIST RAdioactive NUclear Materials (URANUM) Laboratory
Research Interests
  • Nuclear Fuel Performance Experiments & Modeling
  • Radiation Interactions with Matter
  • Thermophysical Investigation of Nuclear Materials
  • Nuclear Non-Proliferation Technology

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DESIGN OPTIMIZATION OF RADIATION SHIELDING STRUCTURE FOR LEAD SLOWING-DOWN SPECTROMETER SYSTEM

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Title
DESIGN OPTIMIZATION OF RADIATION SHIELDING STRUCTURE FOR LEAD SLOWING-DOWN SPECTROMETER SYSTEM
Author
Kim, JeongdongAhn, SangjoonLee, YongdeokPark, Changje
Issue Date
2015-04
Publisher
KOREAN NUCLEAR SOC
Citation
NUCLEAR ENGINEERING AND TECHNOLOGY, v.47, no.3, pp.380 - 387
Abstract
A lead slowing-down spectrometer (LSDS) system is a promising nondestructive assay technique that enables a quantitative measurement of the isotopic contents of major fissile isotopes in spent nuclear fuel and its pyroprocessing counterparts, such as U-235, Pu-239, Pu-241, and, potentially, minor actinides. The LSDS system currently under development at the Korea Atomic Energy Research Institute (Daejeon, Korea) is planned to utilize a high-flux (>10(12) n/cm(2).s) neutron source comprised of a high-energy (30 MeV)/high-current (similar to 2 A) electron beam and a heavy metal target, which results in a very intense and complex radiation field for the facility, thus demanding structural shielding to guarantee the safety. Optimization of the structural shielding design was conducted using MCNPX for neutron dose rate evaluation of several representative hypothetical designs. In order to satisfy the construction cost and neutron attenuation capability of the facility, while simultaneously achieving the aimed dose rate limit (<0.06 mu Sv/h), a few shielding materials [high-density polyethylene (HDPE)-Borax, B4C, and Li2CO3] were considered for the main neutron absorber layer, which is encapsulated within the double-sided concrete wall. The MCNP simulation indicated that HOPE-Borax is the most efficient among the aforementioned candidate materials, and the combined thickness of the shielding layers should exceed 100 cm to satisfy the dose limit on the outside surface of the shielding wall of the facility when limiting the thickness of the HOPE-Borax intermediate layer to below 5 cm. However, the shielding wall must include the instrumentation and installation holes for the LSDS system. The radiation leakage through the holes was substantially mitigated by adopting a zigzag-shape with concrete covers on both sides. The suggested optimized design of the shielding structure satisfies the dose rate limit and can be used for the construction of a facility in the near future.
URI
https://scholarworks.unist.ac.kr/handle/201301/13432
URL
http://www.sciencedirect.com/science/article/pii/S1738573315000248
DOI
10.1016/j.net.2015.01.004
ISSN
1738-5733
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