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EPMA를 이용한 사용후핵연료의 연소도 측정에 관한 연구
정양홍,유병옥,오완호,이홍기,주용선,홍권표,Jung, Yang-Hong,Yoo, Byung-Ok,Oh, Wan-Ho,Lee, Hong-Gy,Choo, Yong-Sun,Hong, Kwon-Pyo 한국현미경학회 2005 Applied microscopy Vol.35 No.3
차폐형 성분분석기 (Shielded EPMA)를 이용하여 한국형 경수로발전소에서 연소된 35,000 MWd/MTU, U-235의 농축도 3.2%인 $UO_2$ 사용후핵연료의 연소도 측정 방법을 제시하였다. 원자로의 출력과 핵연료의 특성 및 중성자속 분포 등 중요한 핵공학적 정보를 제공하는 사용후핵연료의 연소도는 U-235의 감손에 따른 무거운 핵종의 변화를 측정하거나 사용후핵연료 내에 생성된 핵분열 생성물을 측정하는 방법 등이 있다. 이러한 방법은 비파괴시험으로도 하고 있으나 파괴시험인 화학적 분석방법이 보다 정확한 것으로 인식되고 있다. 그러나 화학분석법은 분석시간이 많이 걸리며, 방사선 시료의 취급으로 인한 시험자의 피폭 등의 어려움이 따른다. 화학적 분석방법에 의한 연소도 측정방법 대신 분석시료의 제작 및 분석시간이 화학적 분석방법에 비해 상당히 짧고, 또한 국부적인 연소도 측정이 요구되는 사고 핵연료나 고연소 핵연료의 위치별 연소도 측정이 가능한 EPMA를 사용한 연소도 측정기술이 개발되고 있다. 시험결과 ORIGEN2 코드로 계산한 연소도에 따른 Nd의 농도와 EPMA 분석에 의한 Nd의 농도는 거의 일치하였다. EPMA로 분석한 Nd의 조성과 ORIGEN-2 코드로 계산한 Nd의 조성 분포를 이용하여 사용후핵연료의 연소도를 예측하는 일차 실험식을 유도하였으며, 그 결과가 화학분석에 의한 연소도와 거의 일치함을 확인하였다. The Methodology of burnup calculation with EPMA test set up in this study. The spent fuel from PWR nuclear power plant was used as specimen. This $UO_2$ fuel with 3.2% of enrichment had been irradiated up to 35,000 MWd/MTU. The burnup is very important factor for nuclear fuel to estimate all fuel behaviors in reactor. To measure amounts of fission products and actinides for the burnup calcualation, destructive method analysis has been used but it makes long experimental time and second radio-wastes. In this study, EPMA test was available to measure amount of fission products. Neodymium is able to be detected and quantified. It can be compared with the results from chemical analysis and ORIGEN-2 code calculation. Concentration of Nd from EPMA test showed good agreement with result of ORIGEN-2 code in the same burnup.
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Zircaloy-4 피복관의 DCPD 파괴언성시험법 개발
오동준(Dong Joan Oh),안상복(Sang Bok Ahn),정양홍(Yang Hong Cheong),주용선(Yong Sun Choo),홍권표(Kwon Pya Hong) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.8
To define the causes of cladding degradation which can take place during an operation of nuclear power plants, it is required to develop the new fracture toughness test of fuel cladding. The fracture toughness of Zircaloy-4 cladding has been estimated using the recently developed KAERI embedded Charpy (KEC) specimen. Axially notched KEC specimens which were cut directly from fuel claddings, have been tested in a way similar to the standard toughness test method for a Single Edge Bending (SEB) specimen using DCPD method. The results of KEC fracture toughness test at room temperatures using single specimen were compared with the test data of the previous studis such as multiple specimen method and discussed. In conclusions, even though the KEC fracture toughness test using single specimen DCPD method for fuel claddings was easier and more reliable than those developed earlier, the results from the cladding fracture tests were not the material characteristics but the specific fracture parameters which was deeply related to the specification of claddings. In addition, the phenomenon of a thickness yielding was not observed from the fracture surface. It was closely related to the fact that the plane strain condition of the KEC specimen was changed to the plane stress condition during crack advancing.
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Zircaloy-4 피복관의 KEC 파괴인성시험법 개발
오동준(Dong Joon Oh),안상복(Sang Bok Ahn),김도식(Do Sik Kim),주용선(Yong Sun Choo),홍권표(Kwon Pyo Hong) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.3
To define the causes of cladding degradation which can take place during an operation of nuclear power plants, it is required to develop the new fracture toughness test of fuel cladding. The fracture toughness of Zircaloy-4 cladding has been estimated using the recently developed KAERI embedded Charpy (KEC) specimen. Axially notched KEC specimens which were cut directly from fuel claddings, have been tested in a way similar to the standard toughness test method for a Single Edge Bending (SEB) specimen. The results of KEC fracture toughness test at room temperatures were compared with the test data of the previous studis and discussed. In conclusions, even though the KEC fracture toughness test for fuel claddings was easier and more reliable than those developed earlier, the results from the cladding fracture tests were not the material characteristics but the specific fracture parameters which was deeply related to the specification of claddings. In addition, the phenomenon of a thickness yielding was not observed from the fracture surface. It was closely related to the fact that the plane strain condition of the KEC specimen was changed to the plane stress condition during crack advancing. It was also supported by the fractographic evidence that the formation of ductile dimple at the crack initiation became the similar state such as a quasi-cleavage.
ScienceON
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