The Experts below are selected from a list of 33 Experts worldwide ranked by ideXlab platform
Il Soon Hwang - One of the best experts on this subject based on the ideXlab platform.
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advanced passive design of small modular reactor cooled by heavy liquid metal natural circulation
Progress in Nuclear Energy, 2015Co-Authors: Yonghoon Shin, Sungyeol Choi, Jaehyun Cho, Ji Hyun Kim, Il Soon HwangAbstract:Abstract We applied a passive cooling feature to both normal and abnormal operations of a small modular reactor (SMR) without external Power Sources and reactor coolant pumps. The SMR, named as URANUS, with a thermal Power rating of 100 MW is well suited as a Distributed Power Source because it has a refueling interval of 20 years without assembly reconfiguration. This reactor is a pool type fast reactor with an array of heterogeneous hexagonal core using UO2 fuels. Material corrosion is limited by using corrosion-resistant materials and keeping acceptable low outlet temperature in combination with an oxygen control technique. The reactivity swing during the core lifetime is less than $1 without burnable poison rods to minimize excess reactivity. Three-dimensional seismic isolators are deployed underneath the entire reactor building allowing an earthquake of 0.5 g zero period acceleration for the safe shutdown earthquake. The adoption of the complete passive safety systems enhances the safety performance of the reactor, but simultaneously limits volume Power density and discharge burn-up. Thus, the future study on this reactor will focus on the Power maximization of the reactor while maintaining land transportable sizes and coolant natural circulation.
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pascar long burning small modular reactor based on natural circulation
Nuclear Engineering and Design, 2011Co-Authors: Sungyeol Choi, Dina Puspitarini, Ji Hoon Jeun, Il Soon HwangAbstract:Abstract PASCAR is a 100 MWt/35 MWe lead–bismuth-cooled small modular reactor which requires no on-site refueling and well suits to be used as a Distributed Power Source in either a single unit or a cluster for electricity, heat supply, and desalination. This paper includes both steady-state and transient performance evaluations for neutronics and thermal–hydraulics. Through design optimization studies for minimizing a burn-up reactivity loss, the metallic fuels-loaded core was designed with less than 1$ reactivity swing over 20-year cycle. A radial peaking Power location shows the slow inward migration from outer enrichment zones while maintaining peaking factor within 1.35, reducing radiation damage and corrosion duty of high temperature environments. Equipped with coolant flow path large enough to ensure low pressure drop, this reactor is intended to operate by only natural circulation of chemically inert coolant within relatively low temperature range, 320–420 °C. Peak outlet temperature is nearly 450 °C where an Al-containing duplex cladding has sufficient corrosion resistance. Despite of 50% decrease of fuel thermal conductivity after swelling, inherent negative reactivity feedback and passive decay heat removal capability could secure an ample safety margin of peak fuel centerline temperature in tow safety analyses, unprotected transient overPower and unprotected loss of heat sink. The likelihood of loss of coolant, loss of flow, and local blockage is virtually eliminated by employing respectively a double-walled vessel, pump-less cooling, and cross-flow allowed open square assemblies. Simple fabrication, modular construction, and long burning cycle would compensate for economic disadvantages over smaller Power and lower temperature than those of conventional fast reactors.
Sungyeol Choi - One of the best experts on this subject based on the ideXlab platform.
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advanced passive design of small modular reactor cooled by heavy liquid metal natural circulation
Progress in Nuclear Energy, 2015Co-Authors: Yonghoon Shin, Sungyeol Choi, Jaehyun Cho, Ji Hyun Kim, Il Soon HwangAbstract:Abstract We applied a passive cooling feature to both normal and abnormal operations of a small modular reactor (SMR) without external Power Sources and reactor coolant pumps. The SMR, named as URANUS, with a thermal Power rating of 100 MW is well suited as a Distributed Power Source because it has a refueling interval of 20 years without assembly reconfiguration. This reactor is a pool type fast reactor with an array of heterogeneous hexagonal core using UO2 fuels. Material corrosion is limited by using corrosion-resistant materials and keeping acceptable low outlet temperature in combination with an oxygen control technique. The reactivity swing during the core lifetime is less than $1 without burnable poison rods to minimize excess reactivity. Three-dimensional seismic isolators are deployed underneath the entire reactor building allowing an earthquake of 0.5 g zero period acceleration for the safe shutdown earthquake. The adoption of the complete passive safety systems enhances the safety performance of the reactor, but simultaneously limits volume Power density and discharge burn-up. Thus, the future study on this reactor will focus on the Power maximization of the reactor while maintaining land transportable sizes and coolant natural circulation.
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pascar long burning small modular reactor based on natural circulation
Nuclear Engineering and Design, 2011Co-Authors: Sungyeol Choi, Dina Puspitarini, Ji Hoon Jeun, Il Soon HwangAbstract:Abstract PASCAR is a 100 MWt/35 MWe lead–bismuth-cooled small modular reactor which requires no on-site refueling and well suits to be used as a Distributed Power Source in either a single unit or a cluster for electricity, heat supply, and desalination. This paper includes both steady-state and transient performance evaluations for neutronics and thermal–hydraulics. Through design optimization studies for minimizing a burn-up reactivity loss, the metallic fuels-loaded core was designed with less than 1$ reactivity swing over 20-year cycle. A radial peaking Power location shows the slow inward migration from outer enrichment zones while maintaining peaking factor within 1.35, reducing radiation damage and corrosion duty of high temperature environments. Equipped with coolant flow path large enough to ensure low pressure drop, this reactor is intended to operate by only natural circulation of chemically inert coolant within relatively low temperature range, 320–420 °C. Peak outlet temperature is nearly 450 °C where an Al-containing duplex cladding has sufficient corrosion resistance. Despite of 50% decrease of fuel thermal conductivity after swelling, inherent negative reactivity feedback and passive decay heat removal capability could secure an ample safety margin of peak fuel centerline temperature in tow safety analyses, unprotected transient overPower and unprotected loss of heat sink. The likelihood of loss of coolant, loss of flow, and local blockage is virtually eliminated by employing respectively a double-walled vessel, pump-less cooling, and cross-flow allowed open square assemblies. Simple fabrication, modular construction, and long burning cycle would compensate for economic disadvantages over smaller Power and lower temperature than those of conventional fast reactors.
Yonghoon Shin - One of the best experts on this subject based on the ideXlab platform.
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advanced passive design of small modular reactor cooled by heavy liquid metal natural circulation
Progress in Nuclear Energy, 2015Co-Authors: Yonghoon Shin, Sungyeol Choi, Jaehyun Cho, Ji Hyun Kim, Il Soon HwangAbstract:Abstract We applied a passive cooling feature to both normal and abnormal operations of a small modular reactor (SMR) without external Power Sources and reactor coolant pumps. The SMR, named as URANUS, with a thermal Power rating of 100 MW is well suited as a Distributed Power Source because it has a refueling interval of 20 years without assembly reconfiguration. This reactor is a pool type fast reactor with an array of heterogeneous hexagonal core using UO2 fuels. Material corrosion is limited by using corrosion-resistant materials and keeping acceptable low outlet temperature in combination with an oxygen control technique. The reactivity swing during the core lifetime is less than $1 without burnable poison rods to minimize excess reactivity. Three-dimensional seismic isolators are deployed underneath the entire reactor building allowing an earthquake of 0.5 g zero period acceleration for the safe shutdown earthquake. The adoption of the complete passive safety systems enhances the safety performance of the reactor, but simultaneously limits volume Power density and discharge burn-up. Thus, the future study on this reactor will focus on the Power maximization of the reactor while maintaining land transportable sizes and coolant natural circulation.
Ji Hyun Kim - One of the best experts on this subject based on the ideXlab platform.
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advanced passive design of small modular reactor cooled by heavy liquid metal natural circulation
Progress in Nuclear Energy, 2015Co-Authors: Yonghoon Shin, Sungyeol Choi, Jaehyun Cho, Ji Hyun Kim, Il Soon HwangAbstract:Abstract We applied a passive cooling feature to both normal and abnormal operations of a small modular reactor (SMR) without external Power Sources and reactor coolant pumps. The SMR, named as URANUS, with a thermal Power rating of 100 MW is well suited as a Distributed Power Source because it has a refueling interval of 20 years without assembly reconfiguration. This reactor is a pool type fast reactor with an array of heterogeneous hexagonal core using UO2 fuels. Material corrosion is limited by using corrosion-resistant materials and keeping acceptable low outlet temperature in combination with an oxygen control technique. The reactivity swing during the core lifetime is less than $1 without burnable poison rods to minimize excess reactivity. Three-dimensional seismic isolators are deployed underneath the entire reactor building allowing an earthquake of 0.5 g zero period acceleration for the safe shutdown earthquake. The adoption of the complete passive safety systems enhances the safety performance of the reactor, but simultaneously limits volume Power density and discharge burn-up. Thus, the future study on this reactor will focus on the Power maximization of the reactor while maintaining land transportable sizes and coolant natural circulation.
Jaehyun Cho - One of the best experts on this subject based on the ideXlab platform.
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advanced passive design of small modular reactor cooled by heavy liquid metal natural circulation
Progress in Nuclear Energy, 2015Co-Authors: Yonghoon Shin, Sungyeol Choi, Jaehyun Cho, Ji Hyun Kim, Il Soon HwangAbstract:Abstract We applied a passive cooling feature to both normal and abnormal operations of a small modular reactor (SMR) without external Power Sources and reactor coolant pumps. The SMR, named as URANUS, with a thermal Power rating of 100 MW is well suited as a Distributed Power Source because it has a refueling interval of 20 years without assembly reconfiguration. This reactor is a pool type fast reactor with an array of heterogeneous hexagonal core using UO2 fuels. Material corrosion is limited by using corrosion-resistant materials and keeping acceptable low outlet temperature in combination with an oxygen control technique. The reactivity swing during the core lifetime is less than $1 without burnable poison rods to minimize excess reactivity. Three-dimensional seismic isolators are deployed underneath the entire reactor building allowing an earthquake of 0.5 g zero period acceleration for the safe shutdown earthquake. The adoption of the complete passive safety systems enhances the safety performance of the reactor, but simultaneously limits volume Power density and discharge burn-up. Thus, the future study on this reactor will focus on the Power maximization of the reactor while maintaining land transportable sizes and coolant natural circulation.