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Tsing Hua Open-Pool Reactor (THOR)
Tsing Hua Open Pool Reactor(THOR)

The major task of the Nuclear Reactors Division is to operate and maintain the Tsing Hua Open-pool Reactor (THOR) and to ensure uninterrupted services for neutron irradiation, personnel training, and radioisotope production. To make these services constantly available, this division offers irradiation facilities, peripheral research equipment, and supporting staff to those who are interested in nuclear related activities. In addition to running the THOR, neutron activation analysis, neutron radiography, and ageing management for nuclear reactors are also major research activities in this division.


  TRIGA rod-type conversion fuel (UZrH1.6-Er) at 20% enrichment with a 235U critical mass of 9 kg.


  Pure liquid light water without steam in the amount of 80,000 gallons

  Forced convection


  Control rod worth: 11.28%

  Excess reactivity: 7.0%

Neutron Fluxes at 2 MW (n·cm-2·sec-1)

  Core thermal neutron flux (ft): 2.0´1013

  Core fast neutron flux: 1.3´1013

   ft at beamline exit106 -109

Neutron Moderator and Reflector

  Pure light water and graphite

National Tsing Hua University
Nuclear Science and Technology Development Center
Nuclear Reactor/Isotope Division
Tel:03-5713849(Reactor); 03-5725974(Isotope)
Fax:03-5713849(Reactor); 03-5725974(Isotope);