Perturbation Calculation for Reactivity of Components in IHNI-1

The perturbation calculation for the reactivity worth of the components in the first In-Hospital Neutron Irradiator（IHNI-1） was conducted by using MCNP Monte Carlo code（MCNP）,and the reactivity worth of the central control rods,auxiliary control rod,upside Be reflection layer and fuel elements were reasonably calculated.The difference between the calculated value and experimental value was analyzed.The results showed that the calculated value agreed with the experimental value for the components of IHNI-1 reactor,and the calculation precision of the perturbation method meets the requirement on the calculation of reactivity worth of the reactor components.