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FISSION PRODUCT TARGET DESIGN FOR HYPER SYSTEM<br />

Won S. Park, Yong H. Kim<br />

Korea Atomic <strong>Energy</strong> Research Institute<br />

P.O. Box 105, Yusong, Taejon 305-600, Republic of Korea<br />

E-mail: wonpark@kaeri.re.kr<br />

Jong Seong Jeong<br />

Department of <strong>Nuclear</strong> Engineering<br />

Seoul National University, Republic of Korea<br />

Abstract<br />

The design optimisation of FP Target is performed to maximise the transmutation of 99 Tc and 129 I in the<br />

HYPER system without causing any core safety concerns. The localised thermal flux is obtained by<br />

inserting some moderators such as CaH 2<br />

. Many types of target configurations are investigated. The<br />

configuration that 99 Tc is loaded as a plate type in the outer-most region and 129 I is loaded as NaI rods<br />

mixed with CaH 2<br />

rods in the inner region is believed to be the most optimum in terms of transmutation<br />

rate and core power peaking. The designed FP target configuration is estimated to have the<br />

transmutation rate of 6.41%/yr and 13.88%/yr for 99 Tc and 129 I, respectively. The maximum pin power<br />

peaking is 1.232 that is within the acceptable range. In addition, the configuration is expected to make<br />

the core coolant void coefficient more negative but the Doppler coefficient less negative.<br />

479

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