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[en] The irradiation tests of the DUPIC fuel using a rig have been carried out at the HANARO research reactor of KAERI in order to analyze the in-core performance. For this study, the non-instrumented rig was developed in 1998, and 4 separate irradiation tests for the DUPIC fuel were performed successfully from 1999 to 2002. In 2004, the instrumented irradiation test was performed to measure the centerline temperature of the DUPIC fuel. The measured maximum temperature of the DUPIC fuel rods was estimated to be 1,100 C at the maximum linear element rating of 38 kw/m. The discharge burn-up was calculated to be 2,133 MWd/tHM. The post irradiation examination results show that a rapid power change during the start-up of HANARO caused large cracks along the radial direction of the instrumented DUPIC pellet. (Author)
[en] The importance of renewable energy as a response to climate change is universally acknowledged. However, its successful implementation requires public approval and cooperation. This study aims to identify the level of renewable energy acceptance in Korea by estimating Korean consumers’ additional willingness to pay (WTP) using the contingent valuation (CV) method, which is the most widely used to analyze consumer preferences. The estimation results indicate that Korean consumers are willing to pay an additional USD 3.21 per month for electricity generated with renewable energy. However, WTP in Korea is low relative to other advanced nations, indicating that these values could be influenced through policies aimed at improving knowledge and acceptance of renewable energy sources among Korean consumers. - Highlights: •Measures renewable energy acceptance in Korea with willingness to pay (WTP) estimates. •Contingent valuations estimate WTP overall and by consumer characteristics. •WTP in Korea doubled since the Fukushima disaster, but lags other advanced countries. •Policies must improve acceptance of renewables to enable construction of facilities.
[en] The flow characteristic of the irradiation test rigs has been investigated by using a commercial CFD code, CFX-5.7(Ansys Inc.). The test rigs had been developed and fabricated to irradiate the DUPIC mini-elements in the HANARO research reactor of the Korea Atomic Energy Research Institute. First, the fluid flow through the DUPIC-2 test rig was calculated and compared with an experimental data. The computed pressure drops across the DUPIC-2 test rig match well with the experimental data. Then, a CFD analysis has been performed for the fluid flow through the newly-designed DUPIC-6 test rig. As results of the prediction, it is estimated that the mass flow rate is 8.0 kg/s under the pressure drop across the DUPIC-6 test rig of 215.5 kPa. The corresponding the maximum vibration displacement is expected to be around 50 □m, which satisfies the license limit with large margin
[en] In the context of this report, the basic concept of UNARMS was described and the development status and the process of KAERI's C/S and LANL's UNARM was described. UNARM system was divided into hardware and software at this report. At UNARM's hardware, MiniGRAND that measures neutron and gamma, MiniADC that measures energy spectrums of Uranium and Cesium, ISR/AMSR that measures neutron and camera system were described about features and use methods. And ILON that can be connected to instruments was described. MIC program that is designed for unattended collection and saving of data from multiple, distributed data acquisition instruments was explained at UNARM's software. Review programs that can be analysis data from saved data file were verified. Finally, the analysis of LANL laboratory's UNARM in operation was performed and upgraded as system that application is possible. And new review program was developed according to the upgrade system
[en] The LVDT (Linear Variable Differential Transformer) is used to measure the elongation and pressure of a nuclear fuel rod, or the creep and fatigue of the material during a reactor irradiation test. This device must be a radiation-resistant LVDT for use in a research reactor. Norway Halden has LVDTs for an irradiation test by the own development and commercialized. But Halden's LVDTs have limited the temperature of the use until to 350 .deg. C. So, KAERI has been developing a new LVDT for high temperature irradiation test. This paper describes the design of a LVDT, the fabrication process of a LVDT, and the result of the performance test. The designed LVDT uses thermocouple cable for coil wire material and one MI cable as signal cable. This LVDT for a high temperature irradiation test can be used until a maximum of 900 .deg. C. Welding is a very important factor for the fabrication of an LVDT. We are using a 150W fiber laser welding system that consists of a welding head, monitoring vision system and rotary index.
[en] An unattended remote and monitoring system (UNARMS) allows information to be captured and recorded continuously in the absence of an inspector. The Los Alamos National Laboratory (LANL) has developed UNARMS and implemented it in Kazakhstan and Japan. Here, LANL's UNARMS has been studied and upgraded. The upgraded UNARMS divides into hardware and software. On UNARMS's hardware, only a simple change was made that IP camera was used instead of the ALIS Camera. But in a UNARM's software, a completely new review program was developed according to the upgrade system. The developed review program is an integrated program in which the Review programs (Radiation Review, Digital Video Review, Operation Review) functions were integrated into one
[en] Irradiation test using a capsule has been performed for fuel or material performance test in the test reactor. Irradiation capsule for the HANARO reactor must satisfy the hydraulic conditions and structural integrity from a out-pile test. Items of a out-pile test are pressure drop, flow-induced vibration test and endurance test. The results of test must show that a test capsule satisfy the HANARO operational requirement with sufficient margin. This paper describes the devices of thermal hydraulic test and the results of SFR test capsule
[en] Survey on the development status has been performed on the laser as the device of a radioactive surface decontamination and gamma camera as the device of a contamination measurement. The laser is directly applied to a radioactive contamination on the metal or the concrete surface, then the contamination is removed. Its method has the follow advantages; noncontact method, selective removal of contamination area, negligible amounts of additional waste generated. Laser cleaning process is completed at a cooling state before waste generated. Laser cleaning process is completed at a cooling state before the heat wave propagate to substrate and the contamination material is filtered by the suction device. The gamma camera show a contaminated nuclide and pattern with 2-dimension by remote measurement. The gamma camera is consist of 3 part; collimated radiation measurement part, CCTV image process part, distance measurement part. Therefore, if a radiation position and level are defined by the gamma camera and the laser device is used with remote control, it is very useful at decontamination and decommissioning of the nuclear facility. (author). 44 refs., 4 tabs., 34 figs
[en] Irradiation test using a capsule has been performed for fuel or material performance test in the test reactor. Instruments and instrument attachment technology have been developed for an irradiation test. The LVDT (Linear Variable Differential Transformer) is measuring the elongation and the pressure of nuclear fuel rod during the irradiation test. This device is a radiation resistant LVDT to use in a research reactor. The LVDTs for an irradiation test have been used Norway Halden's development LVDTs in the KAERI but the KAERI is developing a new LVDT since 2007 because of high cost. This paper describes about the design of LVDT and the fabrication of LVDT that is developed until present
[en] The DSNC(DUPIC Safeguards Neutron Counter) was developed jointly to account for nuclear materials with KAERI and LANL at the end of the 1990's. The DSNC was authorized by IAEA at the IMEF M6 hotcell of KAERI and had operated normally until 2003. But the IAEA inspection of early 2004 was not performed by the abnormal state of the DSNC. The LANL specialist was invited to examine the abnormal state of the DSNC, but did not solve the problem. The test of the DC power supply through the IAEA cabinet was performed in early 2006 and the state of the DSNC got back almost normally. This paper is results of analysis about the current status and performance test of DSNC after applied 6V to amplifier