[en] High power proton accelerator is considered as one of national fundamental research facilities and a key to advanced nuclear technology development, having been widely used in an un detachable relationship with nuclear research in advanced countries. The high power proton accelerator will be installed in several phases as an up front facility of the nuclear waste transmutation system. It is expected that a common understanding and a general agreement over proper utilization of the accelerator should be deduced and that a user program for beam utilization and application should be firmly established in time for the completion of each phase of the accelerator. This high power proton accelerator will consist of several component accelerators and, from up front, accelerators such as injector, RFQ, CCDTL, etc. will be installed in sequence and deliver respectively at each stage beams of 3MeV, 20MeV, 100Mev, etc. to be variously utilized for industries, defence industry, medical treatment, environmental protection and basic science research. In order for the accelerator to be fully utilized as a national fundamental research facility beyond nuclear field, it is necessary to formulate a proceeding plan of the user program for the accelerator and to cultivate industrial utilization/application studies of proton beams accelerated by injector or RFQ of the accelerator. (author). 38 refs., 84 tabs., 39 figs

[en] Sodium fire is graded 'D' and it is difficult to extinguish sodium fire. In this report, the characteristics of sodium fire and the methods composing the suitable fire extinguishing systems to suppress fire effectively were described

[en] The requirements of the high voltage power supply for PEFP Proton Accelerator RF systems are 100 kV, 20 A with the conditions that both the voltage ripple and regulation are less than 1 %, and energy deposition in the klystron at the tube arc is less than 20 J. The high voltage power supplies for the RFQ and the DTL are designed and fabricated. The high voltage power supply of RFQ consists of IVR, Transformer/Rectifier, and Iginitron Crowbar switch. For DTL, it consists of thyristor controller, Trasformer /Rectifier, and IGBT opening switch. The both systems are tested and the results satisfy the all requirements

[en] A study on the development plan and preliminary design for the realisation of high current proton accelerator to be used as an essential component for the R and D of accelerator-driven system (ADS) for energy production and transmutation of long-lived radionuclides. Various fields of application of the accelerator such as basic nuclear physics, material science, biology, high energy physics, medicine, etc. were also investigated. From the preliminary design study, 1 GeV (20 mA) - Linac is required for the purposed of transmutation and energy production. Specification of injector, RFQ, CCTL and SL was also suggested. For the case study, a duoplasmatron ion source was designed by KAERI and fabricated by a domestic manufacturer, and the performance was also tested. (author). 71 refs., 61 tabs., 131 figs

[en] The cleaning tests of the impurity purification devices dismantled from sodium test loop are performed. Another specimens containing the crevices correspondent to equipment to be reused (bellows valve, pressure gage and the like) are prepared and tested. This report includes all aspects of cleaning devices and describes the cleaning methods by -steam and bubbling, and their results

[en] This report reviews the basic requirements for the sodium test facility design and construction. And it delineates the concepts necessary to operate facilities for high accuracy and efficiency of the test. It also provides details on some system components and materials

[en] The design results and the developmental status of the KSTAR NBI system are described. The KSTAR Neutral Beam system shall provide ion heating, current drive, core fueling, profile controls for pressure and current by injecting energetic neutral particle beam, and support diagnostic requirements. The facility shall initially be configured to provide 8 MW of deuterium neutral beam power to the plasma per beam line. It can be achieved by a modification of one TFTR beam line with 300-s pulse lengths. The facility shall be capable of accommodating 14 MW of deuterium neutral beam power to the plasma (one co-directed TFTR beam lines plus one counter-directed TFTR beam line modified for 300-s pulse lengths). The beam line shall be oriented with a tangency radius for the central beam trajectory of 1.486 m. The beams shall inject at fixed angular positions

[en] In a liquid metal nuclear reactor using the sodium as a coolant, the upper plenum of reactor vessel has a free surface where the coolant sodium contacts with the cover gas. If the cover gas is entrained by the sodium flow at the free surface, the gas causes a change in reactivity of the core and also reduces the heat removal capability of the intermediate heat exchanger. An experimental study has been carried out to measure the critical conditions for the inception of air entrainment by breaking of surface wave at the free surface in the water test facility where the water is injected at the bottom of the tank and flows out at the side wall whose level is lower than the level of free surface. The 444 data set are obtained and an experimental correlation with dimensionless parameter for the critical gas entertainment condition is developed. The experimental parameters are the vessel diameter(D), the nozzle size(d), the mean water level(H) and the flow rate, and those maximum values are 1000mm, 100mm, 1490mm and 15l / sec respectively. The experimental correlation is described by D/H, d/H, Froude number and a new dimensionless parameter we, a modified Weber number

[en] The non-destructive nuclear material detection technique is one of the novel methods under somewhat dangerous environments, for example, high level radiation or landmine areas. Specially, the detection of a landmine is a hot issue on the peaceful use of nuclear technology for human welfare. Generally, the explosives contain specific elements such as ¹⁴N or ³⁵Cl. The photo-nuclear resonance gamma-rays are produced by nuclear reaction ¹³C(p , γ)¹⁴N or ³⁴S(p, γ)³⁵Cl in which target is bombarded by about 2MeV proton beam extracted from the proton accelerator. To avoid other neighboring resonant gamma-rays, we selected a higher resonant energy above 5MeV. The resonance gamma rays produced are absorbed or scattered when they react with ¹⁴N or ³⁵Cl included in the mines and explosive. We can determine existence and position of mines or explosives by detecting the absorption and scattering gamma-ray signals

[en] Neutron supermirror is used not only for neutron guide tubes that their make it possible to transmit neutrons for long distance with low losses in intensity but for neutron benders used as a beam splitter. These devices are of main components of advanced neutron diffractometer or spectrometer with cold neutrons. In this report, the basic principles and applications of neutron guide tube and neutron supermirror as well as the performance test results of neutron V-bender were introduced. These information will be used for the development of advance cold neutron spectrometers in the future