FRP 복합재료 중 CFRP(탄소 섬유 강화 플라스틱)는 현재 RC 구조물의 내부 및 외부 보강재로서 그리드 형태로 활용되고 있다. 그러나 CFRP 그리드에 대한 성능평가 기준은 매우 미흡하여 FRP 보강근 기준을 사용하고 있다. 따라서 본 연구에서는 그리드 가닥 수와 경계조건과 변수를 고려하여 CFRP 그리드의 인장 성능을 평가하기 위한 실험이 수행되었다. 가닥 수는 1, 2, 3가닥에 대한 인장시험이 수행되었으며, 경계조건의 경우 모르타르, 에폭시, 에폭시 + 모르타르로 변수를 지정하였다. 인장시험을 통하여 최적 가닥 수 및 최적 경계조건으로 개발한 시편을 토대로 고온 노출 시간에 따라 CFRP 그리드의 인장 성능 평가가 수행되었다. 온도는 130°C 로 유지되었으며, 5개의 시편을 각각 70분(Case 2), 100분(Case 3), 120분(Case 4), 150분(Case 5) 고온에 노출하여 비 고온 노출 시편 과 비교하였다. 실험 결과, 비 고온 노출 시편과 비교하여 Case 5에서는 인장강도와 탄성계수가 각각 최대 51.32% 및 44.4% 감소한 것으로 나타났다.

Fuel test loop is an irradiation test facility which can conduct the irradiation tests of nuclear fuels and materials at HANARO. The FTL simulates the operating conditions of commercial nuclear power plants such as their pressure, temperature, flow and water chemistry to conduct the irradiation and thermo-hydraulic tests. The passivation of the fuel test loop was performed for the main cooling system in the commissioning stage with satisfaction of the operation criterion such as temperature and water chemistry conditions. The experimental results show that the passivation was completed successfully.

The In-Pile Section(IPS) is located inside the reactor pool. It is divided into 3-parts; the in-pool pipes, the IVA(IPS Vessel Assembly) and the support structures. The test fuel is loaded inside a double wall, inner pressure vessel and outer pressure vessel, to keep the functionality of the reactor coolant pressure boundary. The IVA is manufactured by local company and the functional test and verification were done through pressure drop, vibration, hydraulic and leakage tests. A IVA has been manufactured by local technique and have finally tested under high temperature and high pressure. The IVA and piping did not experience leakage, as we have checked the piping, flanges, assembly parts. We have obtained good data during the three cycle test which includes a pressure test, pressure and temperature cycling, and constant temperature.

The high temperature due to climate change may result in the intensification of several drought and heat stress on crops including potato. These abiotic stress affect on potato development staages; sprout development, tuber initiation and maturation. Potatoes need moderate amounts of nitrogen and cool night for good tuber growth. Especially, high temperature in soil will delay tuber initiation and induce malformation. Therefore, to identify quickly heat tolerant lines and breeding potato lines adapt to high temperature in the field are needed. The objectives of this study were as follows; To apply in vitro screening method for identifying potato lines adapted to high temperature conditions. To verify these results under field assays carried out under natural high temperature field conditions. We used in vitro screening methods with breeding lines from Intranational Potato Center(CIP) under three temperature regime, 18℃, 25℃ and 30℃. All breeding liens had some genotype that produced microtubers at 18℃ and 25℃, with a clear tendency for lower percentage of tuberization at the high temperature. To verify in vitro screening methods for heat tolerance lines, we carried out natural high temperature filed evaluation at Tacna, La Molina and Sanramon in Peru. The results of both the in vitro test and the field assay showed clear relationship and similar expression of tuberization percentage. This finding supports the use of the in vitro assay as a rapid screening methods that represents performance at the field level. But the correlation between performance of the breeding lines under the in vitro and field condions was low. This could be due to differential response to breeding lines to characteristics of the field environment, such as soil salinity, drought, which were not represented in the in vitro assay.