[en] The decommissioning work which begin in latter half of 2001 was gone well in latter half of 2002. Now, 8 laboratories, 10 lead hot cells, and 2 concrete hot cells was dismantled. Wastes produced by decommissioning process were classified with three category. The decontaminatable wastes in the solid radioactive ones will be changed with free release ones. For this, we developed cylindrical rotating pipe decontamination units, ultrasonic ones, and steam jet ones. Test of these units was started in 2002 and they will be using decontamination work in 2003. According to regulation of atomic act 55, the Decommissioning Plan and Environmental Impact Assessment for uranium conversion plant were written out and presented. Basic research for metal wastes decontamination and research for lagoon sludge treatment was carried out.

[en] The final goal of this project is to complete the decommissioning of the Korean Research Reactor no.1 and no. 2(KRR-1 and 2) and uranium conversion plant safely and successfully. The goal of this project in 2006 is to complete the decontamination of the inside reactor hall of the KRR-2 which will be operating as a temporary storage for the radioactive waste until the construction and operation of the national repository site. Also the decommissioning work of the KRR-1 and auxiliary facilities is being progress. As the compaction of decommissioning project is near at hand, a computer information system was developed for a systematically control and preserve a technical experience and decommissioning data for the future reuse. The nuclear facility decommissioning, which is the first challenge in Korea, is being closed to the final stages. We completed the decommissioning of all the bio-shielding concrete for KRR-2 in 2005 and carried out the decontamination and waste material grouping of the roof, wall and bottom of the reactor hall of the KRR-2. The decommissioning for nuclear facility were demanded the high technology, remote control equipment and radioactivity analysis. So developed equipment and experience will be applied at the decommissioning for new nuclear facility in the future

[en] In 2004, the dismantling of the reactor pool, including the equipment in the pool, was started. The radioactivity of the equipment, caused by activation was much higher than the expected activity and 7 remotely operated devices were developed to dismantle them. Project management including man power control, quality control was carried out and radiation protection programs and environmental surveillance was also conducted. The waste from dismantling sites was classified according to the physco-chemical properties and radioactivity level, each was further treated or stored according to the relevant procedures. The issues from the safety evaluation by KINS was analyzed and answered. Some preparative works, such as a supply of new electric source and installation of a new ventilation system, were conducted. A process for the treatment of the sludge waste in lagoon was developed and the basic requirements for the process were established

[en] The goal of this project is the safe and successful decommissioning of the inside reactor hall of the Korean Research Reactor No 2 (KRR-2) and convert to temporary storage facility for the radioactive waste produced during decommissioning. It's necessary to manage the overall decommissioning and decontamination project for the man-power, the progress of the work, etc. needed to works and to develop the suitable technology and equipment in order to perform the decommissioning works for the purpose of securing the safety and minimizing the radiation exposure for works. Also, the large amount of the liquid and solid wastes were generated from the dismantling works. The radioactivity of the waste was not high but the amount was large and the properties was very diverse, and therefore unique management technologies were required for the decommissioning waste. The operation experience of the uranium conversion plant as a nuclear cycle facility was contributed to the localization of nuclear fuels for HWR. It was shut down in 1993. And, in 2001 the decontamination and dismantlement program for the conversion plant has been launched to achieving radiation safety and environment restoration. Conversion plant environment restoration project will be contributed to developing the decontamination and dismantlement technologies related to other domestic nuclear facilities and to set new criteria in the D and D areas

[en] As preparation work, work procedure, waste management procedure, radiation safety management procedure etc. were drawn up and radioactivity measurement was carried out in order to assess the radiological status. Facilities on KRR-2 such as radioisotope production equipment, sample preparation room, laboratories etc. have been dismantling since August. Especially, lead hot cells were all dismantled except for concrete structure. The activity of the dismantled equipment and waste was less than free release criteria. Environmental restoration project for the uranium conversion facility will be accomplished for 3 years. First of all, radiological status was investigated and the decommissioning plan is conducting to acquire decommissioning license

[en] The final goal of this project is to complete safely and successfully the decommissioning of the Korean Research Reactor no.1 (KRR-1) and the Korean Research Reactor no.2 (KRR-2), and uranium conversion plant (UCP). The dismantling of the reactor hall of the KRR-2 was planned to complete till the end of 2004, but it was delayed because of a few unexpected factors such as the development of a remotely operated equipment for dismantling of the highly radioactive parts of the beam port tubes. In 2005, the dismantling of the bio-shielding concrete structure of the KRR-2 was finished and the hall can be used as a temporary storage space for the radioactive waste generated during the decommissioning of the KRR-1 and KRR-2. The cutting experience of the shielding concrete by diamond wire saw and the drilling experience by a core boring machine will be applied to another nuclear facility dismantling. An effective management tool of the decommissioning projects, named DECOMIS, was developed and the data from the decommissioning projects were gathered. This system provided many information on the daily D and D works, waste generation, radiation dose, etc., so an effective management of the decommissioning projects is expected from next year. The operation experience of the uranium conversion plant as a nuclear fuel cycle facility was much contributed to the localization of nuclear fuels for both HWR and PWR. It was shut down in 1993 and a program for its decontamination and dismantling was launched in 2001 to remove all the contaminated equipment and to achieve the environment restoration. The decommissioning project is expected to contribute to the development of the D and D technologies for the other domestic fuel cycle facilities and the settlement of the new criteria for decommissioning of the fuel cycle related facilities

[en] In 2008, tried to complete the whole decommissioning project of KRR-1 and KRR-2 and preparing work for memorial museum of KRR-1 reactor. Now the project is delayed for 3 months because of finding unexpected soil contamination around facility and treatment of. To do final residual radioactivity assessment applied by MARSSIM procedure. Accumulated decommissioning experiences and technologies will be very usefully to do decommissioning other nuclear related facility. At the decommissioning site of the uranium conversion plant, the decontamination of the dismantled carbon steel waste are being performed and the lagoon 1 sludge waste is being treated this year. The technologies and experiences obtained from the UCP dismantling works are expected to apply to other fuel cycle facilities decommissioning. The lagoon sludge treatment technology is the first applied technology in the actual field and it is expected that this technology could be applied to other country

[en] The final goal of this project is to complete the decommissioning of the Korean Research Reactor no.1 and no.2(KRR-1 and 2) and uranium conversion plant safely and successfully. The decommissioning the five incidental facilities was successfully carried out and the scoping survey and characterization survey of radioactivity on KRR-1 and KRR-2 site were proven as basic steps for the final evaluation of the residual radioactivity and assessment of the rehabilitation of the KRR-1 and KRR-2 site in 2008. After this works, the FSSR(Final Status Survey Report) will be submitted to the regulatory body for the release of the site from the regulation in 2009. The first decommissioning project of a domestic nuclear facility is now in its closing stages. The decommissioning for nuclear facility may demand the high technologies, remote control equipment and radioactivity assessment. So the developed technologies and the obtained experiences could be applied to new decommissioning projects of the nuclear facilities in the future, including north Korea nuclear facilities. At the decommissioning site of the uranium conversion plant, the decontamination of the stainless steel waste was performed and the all the sludge of the lagoon-2 waste was completely treated in this year. The technologies and experiences obtained from the UCP dismantling works are expected to apply to other fuel cycle facilities. The lagoon sludge treatment technology was the technology firstly tried in actual decommissioning sites in Korea and it is expected that this technology could be applied to other country

[en] According to the Atomic Energy Act article 31 and 36, the decommissioning plan for the license of the Korea Research Reactor 1 and 2(KRR-1 and 2) was submitted to the Ministry of Science and Technology(MOST), and it was reviewed by the Korea Institute of Nuclear Safety(KINS). This report concerned to the data which were studied and investigated to answer the 1st 120 questions arising from reviewing decommissioning plan. It is including the data of the KRR-1 and 2 facilities, decommissioning method, project management, decontamination and dismantling activity, and treatment, packaging, transportation and disposal of radioactive wastes. And it also described in detail on the radiation protection plan, radiation safety management and quality assurance system and additional monitoring plan for the environmental impact during the decommissioning period

[en] According to the atomic energy act article 31 and 36, the decommissioning plan for the license of the Korea Research Reactor 1 and 2(KRR-1 and 2) was submitted to the Ministry of Science and Technology(MOST), and it was reviewed by the Korea Institute of Nuclear Safety(KINS). This report concerned to the data which were studied and investigated to answer the 2nd and 3rd, almost 200 questions arising from reviewing decommissioning plan. It is including the data of the KRR-1 and 2 facilities, decommissioning method, project management, decontamination and dismantling activity, and treatment, packaging, transportation and disposal of radioactive wastes. And it also described in detail on the radiation protection plan, radiation safety management and quality assurance system and additional monitoring plan for the environmental impact during the decommissioning period