The development of silicon doping technique by neutron transmutation

This is the interim report for the technique/facility development of neutron transmutation doping (NTD) to be performed at new research reactor, KMRR(30MW) which is under construction at KAERI. The first year's scope and contents of this project include evaluation and plan of fundamentals such as evaluation of neutron field, irradiation technique, design of mechanical driving and electronic control units, etc.. 1.The thermal neutron flux and quality are estimated for the irradiation holes, NTD-1 and NTD-2 in KMRR respectively and results turned out to be appropriate for the NTD. 2.As for the uniform irradiation method, both 'fixed position method' and 'constant velocity method' are chosen as optimal ones. Real-time monitoring for the neutron irradiation is to be executed by means of 4 SPND units/hole. 3.The NTD irradiation system is preferably to be a semi-automation at the initial stage. After acquiring enough experience with NTD operation and being assured of compatibility with other experimental facilities, a full-scale automatic system is to be developed. Mechanical driving unit is to be operated with independent up-down and rotation of Si ingot motion by using servo motor and IBM /AT so that both fixed position and constant velocity methods can be operated. 4.Studies are in progress for the precise measurement of the absolute neutron flux distribution in irradiation holes. (Author)