[en] The National Nuclear Energy Agency of Indonesia (Batan) has appointed a team for development of high temperature gas cooled reactor (HTGR) in 1993 to conduct studies on high termperature reactor (HTR) technology and its application. The team was initially divided into two groups including reactor technology, safety and applications. R and D on nuclear fuel have been started in 1980s. Significant achievement has been conducted in mastering U₃Si₂ fuel technology in order to self - supply of plate type fuel for 30 MW RSG - GAS reactor. The work was conducted with the assistance of the IAEA through a technical assistance program starting in 1989 and ceased in 1995. Under the IAEA's technical assistance program came a German and several US experts providing direct assistance and supervision. The program had successfully brought Indonesia a capability to produce U₃Si₂ fuel elements and ultimately insert some U₃Si₂ fuel elements in 1991, which then were subjected to successful post - irradiation examinations three years later. The HTR program was subsequently expanded in 1997 into five general areas of HTGR development including reactor technology, optimization of electricity, steam co - generation, safety, environmental, coal liquefaction, desalination, instrumentation, control the HTR fuel cycle. Unfortunately monetary crisis, gives impact on R and D activity including the HTR fuel program. The paper present Batan activities during six years. The experimental study has been performed in fuel kernel fabrication, design of fluidized bed experimental reactor, and some fuel performance modeling. Other activities are bibliographic studies in fluidized bed reaction for kernel coating, safety analysis of component reactor failure, and recovery of fuel from GCR - spent fuel. (author)

[en] On the topographic mapping program the azimuth of two fixed triangulation point is needed. Actually, at Rirang sector have not those, so the data is necessarily to be created from the sun observation. It is the best way for solve the problem, because the sun azimuth related to the geographic north (NG). Beside that azimuth can give correction value of compass measuring azimuth. The sun observation are carried out at the morning time using T-2 instrument. The result of sun azimuth at A.0 to A.6 in Rirang sector were calculated N 120/degree/ 26/min/ 13 /sec/ and the azimuth generated using the compass Wild T1 is N 120/degree/, to the azimuth reading correction is about 00/degree/ 26/min/ 13/sec/

[en] The purpose of systematic prospecting activities at Kelawai Bindang Area, West Kalimantan, was to enumerate uranium resources and to obtain scientific explanation on uranium mineralization in this area. The activities were based on the finding of outcrops and boulders radiometric anomaly (200 cps - 300 cps) by CEA-BATAN in 1976. The prospecting methods encompassed detailed geological observation for the identification of geological characteristic of uranium mineralization. This included structure elements of lithological and morphological types, and distribution of boulders anomalous that were supported by radiometric soil grid (25 m spacing) and laboratory analysis (mineralogical and geochemical). The prospecting results indicate that radioactive elements mineralization was controlled by foliation in seri cite schist and quartzite biotite andalusite which in turn associated with monazite and zircon minerals. Major radioactive elements found were thorium (more than 500 ppm) and uranium (less than 50 ppm). Isoradiometric soil anomaly generally oriented from SW to NE and from NW to SE, following stratification strike and boulders distribution found in the northern part of Kelawai Bindang. (author). 6 refs, 11 figs

[en] Result of the previous prospections at Tanah Merah area by CEA-BATAN (1977) and by Djawadi et al (1990) has found the existence of U-bearing monazite boulders, those being found in the intercalation between quarzite and metasilt area. This current systematic prospection is done based on the data of the previous prospection above and intends to get knowledge about the origin of those boulders. This research consists of topographic mapping, emanometric radiometric, and structural element measurements. The results show that the area is located on the NW flank of subhorizontal NE-SW synform which is cut by strike slip faults in various direction, as a dextral sinistral tear faults, and NE-SW normal faults with SE block downthrown. Emanometric and radio-metric anomalous zones and the dispersion of the boulders area parallel and follow the WNW - ESE fractures Zones. Finally, it can be concluded that U-bearing monazite boulders come from veins in the WNW-ESE fractures

[en] The investigation based on the previous study by CEA-BATAN (1977) and PPBGN-BATAN (1992-1994/1996), which was found radiometric anomalies on several outcrops (> 15.000 c/s) and soil (> 200 c/s). In again to find information of distribution, geometry and characteristically of mineralization zones, the systematic prospection was done by radiometric and topographic mapping and uranium geology aspect identification. Zones of mineralization were identified in Tanah Merah had total area 5468.4 m². The outcrops of quarzitic rocks in this zone are characterized by vein distribution which contain uraninite, brannerite, autunite, gummite and gutite. The dominantly associated of their minerals are monazite, tourmaline, molybdenite, pirhotite, pyrite, ilmenite, sphalerite, chalcopyrite and hematite. By chips sampling in quarsite rock to appear of a lowest value is 8.45 ppm, highest 15259.73 ppm and average value is 319.9 to 489.5 ppm. Elements group correlation matrices from each rocks sample shows that the uranium had relatively good correlation with Cu, Pb, Zn, Co and Ni. The mineralized zone are consist of localized mineralization in lateral and vertically distribution. Structurally the mineralization exist in intersection WNW - ESE, NNE - SSw and WNW - ESE (sub horizontal) fracture. The mineralization are identified as vein type, granite related sub type, perigranitic class and polymetallic veins type, type deposits in metamorphic rocks sub class. (author)