Measurement of Ballooning Gap Size of Irradiated Fuels Using Neutron Radiography Transfer Method and HV Image Filter

Cheul-Muu Sim,TaeJoo Kim,Hwa Suk Oh,Joon Cheol Kim 한국비파괴검사학회 2013 한국비파괴검사학회지 Vol.33 No.2

A transfer method of neutron radiography was developed to measure the size of the end plug and a gap of an intact K102L-2, the irradiated fuel of a ballooned K174L-3, a ballooned and ruptured K98L-3. A typical irradiation time of 25 min. was determined to obtain a film density of between 2 and 3 of SR X-ray film with neutrons of 1.5 × 10¹¹ nㆍ㎝?². To validate and calibrate the results, a RISO fuel standard sample, Cd plate and ASTM-BPI/SI were used. An activated latent image formed in the 100 ㎛ Dy foil was subsequently transferred in a dark room for more than 8 hours to the SR film which is a maximum of three half-lives. Due to the L/D ratio an unsharpness of 9.82-14 ㎛ and a magnification of 1.0003 were given. After digitizing an image of SR film, the ballooning gap of the plug was discernible by an H/V filter of image processing. The gap size of the ballooned element, K174L-3, is equal to or greater than 1.2 ㎜. The development of a transfer method played a pivotal role in developing high burn-up of Wolsung and PWR nuclear fuel type.

Design of Solving Similarity Recognition for Cloth Products Based on Fuzzy Logic and Particle Swarm Optimization Algorithm

( Bae-muu Chang ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.10

This paper introduces a new method to solve Similarity Recognition for Cloth Products, which is based on Fuzzy logic and Particle swarm optimization algorithm. For convenience, it is called the SRCPFP method hereafter. In this paper, the SRCPFP method combines Fuzzy Logic (FL) and Particle Swarm Optimization (PSO) algorithm to solve similarity recognition for cloth products. First, it establishes three features, length, thickness, and temperature resistance, respectively, for each cloth product. Subsequently, these three features are engaged to construct a Fuzzy Inference System (FIS) which can find out the similarity between a query cloth and each sampling cloth in the cloth database D. At the same time, the FIS integrated with the PSO algorithm can effectively search for near optimal parameters of membership functions in eight fuzzy rules of the FIS for the above similarities. Finally, experimental results represent that the SRCPFP method can realize a satisfying recognition performance and outperform other well-known methods for similarity recognition under considerations here.

Measurement of Ballooning Gap Size of Irradiated Fuels Using Neutron Radiography Transfer Method and HV Image Filter

Sim, Cheul-Muu,Kim, TaeJoo,Oh, Hwa Suk,Kim, Joon Cheol The Korean Society for Nondestructive Testing 2013 한국비파괴검사학회지 Vol.33 No.2

A transfer method of neutron radiography was developed to measure the size of the end plug and a gap of an intact K102L-2, the irradiated fuel of a ballooned K174L-3, a ballooned and ruptured K98L-3. A typical irradiation time of 25 min. was determined to obtain a film density of between 2 and 3 of SR X-ray film with neutrons of $1.5{\times}10^{11}n{\cdot}cm^{-2}$. To validate and calibrate the results, a RISO fuel standard sample, Cd plate and ASTM-BPI/SI were used. An activated latent image formed in the $100{\mu}m$ Dy foil was subsequently transferred in a dark room for more than 8 hours to the SR film which is a maximum of three half-lives. Due to the L/D ratio an unsharpness of $9.82-14{\mu}m$ and a magnification of 1.0003 were given. After digitizing an image of SR film, the ballooning gap of the plug was discernible by an H/V filter of image processing. The gap size of the ballooned element, K174L-3, is equal to or greater than 1.2 mm. The development of a transfer method played a pivotal role in developing high burn-up of Wolsung and PWR nuclear fuel type.

적응 알고리듬을 이용한 원자로 내부 구조물 진동 감시 파라미터 추정

심철무(Cheul Muu Sim),주영상(Young Sang Joo),조주필(Ju Pil Cho),백흥기(Heung Ki Baik) 대한전자공학회 1994 대한전자공학회 학술대회 Vol.1994 No.7

나노 및 Bio 물질 내부구조 비파괴 분석을 위한 현미경 개발 현황

심철무(Cheul Muu Sim) 한국비파괴검사학회 2016 한국비파괴검사학회지 Vol.36 No.5

바이오와 나노 분야의 비파괴검사는 nm 급의 공간분해능을 요구한다. 바이오와 나노 물질의 내부구조의 비파괴 분석을 위한 공간분해능을 nm급으로 향상시키는Soft X-ray현미경 및 초음파현미경에 대한 기술을 소개한다. 세포생물(Biology)의 단백질구조분석, 수문학(Hydrology)연구, 나노입자거동 등의 연구를 위해서 중성자현미경기술개발 및 현황을 소개하고자 한다. 초음파현미경, Soft X-ray현미경 및 중성자현미경에 대하여 Hybrid 이용자 지원 체계를 구축하여 나노 및 Bio 물질 내부구조 분석기술을 확립하여 지원하고자 한다.

The Analysis of Spectrum on the Barkhausen Noise of Hysteresis Loops on Neutron Irradiated Material

Sim, Cheul-Muu,Chang, Kee-Ok,Park, Kook-Nam,Cho, Man-Soon,Park, Chang-Oong The Acoustical Society of Korea 1999 韓國音響學會誌 Vol.18 No.e1

In relation to a non-destructive evaluation of irradiation damages, the changes in the hysteresis loop and Barkhausen noise amplitude and the harmonics frequency due to a neutron irradiation were measured and evaluated. The Mn-Mo-Ni low alloy steel of RPV was irradiated to a neutron fluence of 2.3 ×10/sup 19/ n/㎠ (E ≥1 MeV) at 288℃. The saturation magnetization of neutron irradiated metal did not change. The neutron irradiation caused the coercivity to increase, whereas susceptibility to decrease. The amplitude of Barkhausen noise parameters associated with the domain wall motion were decreased by a neutron irradiation. The spectrum of Barkhausen noise is analysed with an applied frequency of 4 Hz and 8 Hz, sampling time of 50 μ sec and 20 μ sec. The harmonic frequency shows 4 Hz, 8 Hz, 12 Hz and 16 Hz reflected from an unirradiated specimen. On the contrary, the harmonic frequency disappeared on the irradiated specimen. In addition to the amplitude, the harmonic frequency of Barkhausen noise is taken into accounts as a promising tool for monitoring the irradiation induced degradation of the reactor materials such as a SA508 of PWR-RPV steel and a Zr₄ of HANARO-CNH.

비파괴검사 서비스-글로벌시장 요약 보고서

심철무(Cheul Muu Sim) 한국비파괴검사학회 2021 한국비파괴검사학회지 Vol.41 No.3

비파괴검사 서비스(NDT Service) 글로벌 시장은 노후 인프라 수명연장(원자력/운송/석유화학) 및 첨단 스마트 인프라 개발, 안전규제강화, 신제조업 산업 표준화 및 자동화, 이차전지, 수소전지, 자동차전장품, 항공우주부품(3D 프린팅 기술), 승객 및 화물 안전 우선 운송서비스: Inter State (국가 간 철도), 문화재 복원, 보존 및 진위 여부 판정 등 사회적 산업적 등의 추진요인으로 2019년 82.8억 달러에서 2027년까지 연 10 % 정도 연평균 성장률로 164.1억 달러(US$)를 기대하고 있다. 무인자동화, 로보틱스, AI, 실시간 디지털 영상, 3-4차원 컴퓨터 토모그라피 및 나노-마이크로, Cloud와 연계된 Big Data 등의 기술이 내재된 4.0 스마트 비파괴검사기술은 검사체로부터 수많은 검사 데이터를 제공받는다. 일반적으로 이렇게 진보된 NDT 방법은 검사장비구축, 검사절차 및 데이터 해석이 복잡하다. 따라서 표준화된 교육을 받은 전문적인 이해와 경험을 가진 검사자와 평가자가 필수적이다. 따라서 전문적인 비파괴검사인력양성을 위한 교육/인증/교정서비스 시장이 2019년에는 1억9293만 달러에서 2027년도에는 연 10.5 % 연평균 성장률로 4억205만 달러로 성장을 전망하고 있다. 첨단기술로 개발된 고가 장비의 렌탈 서비스 시장도 2019년 2억 6511만 달러에서 2027년도에는 연 8.7.% 연평균 성장률로 5억871만 달러를 전망하고 있다. It is expected to grow from 8.28 billion dollars in 2019 to 16.41 billion dollars (US$) at an annual average annual growth rate of approximately 10% by 2027 by below demanding of social and industrial field, Life extension of aging infrastructure (nuclear power/transportation/petrochemical) and development of advanced smart infrastructure, Reinforcement of safety regulations, New manufacturing industry standardization and automation, Li-ion batteries, hydrogen fuel cell, automation electronics, aerospace parts (3D printing technology), Passenger and cargo safety priority in transportation service: inter state (international railroad), Restoration, preservation, and authenticity determination of cultural properties, 4.0 Smart Non-destructive testing service (NDT) of global market is stemmed from below advanced technology, Unmanned Automation, Robotics, AI, Real-time digital imaging, Three-four dimensional Computed Tomography and nano-microscope, Data Platform of Big Data in Cloud. The numerous data of test objects is provided owing to the 4.0 Smart Non-Destructive Testing Technology. In general, this advanced NDT method is complex in installation equipment, inspection procedures and data interpretation. Therefore, professional understanding and experience with standardized training is essentially needed. Thus, the education/certification/calibration of service market for nurturing professional 4.0 Smart Non-Destructive Testing personnel is expected to grow from $ 192.93 million in 2019 to $ 400.05 million at a CAGR of 10.5 V% in 2027. The subscription rental service market for expensive equipment developed with advanced technology is also projected to grow from $265.11 million in 2019 to $587.1 million at an annual average growth rate of 8.7.% in 2027.

The Development of a Non-Intrusive Test of Check Valve Using Acoustics and Magnetics

Sim, Cheul-Muu,Choi, Ha-Lim,Baik, Heung-Ki The Acoustical Society of Korea 1997 韓國音響學會誌 Vol.16 No.e1

Check valves used in industrial and Nuclear Power Plant safety systems are susceptible to failure modes generally associated with wear of internal parts. Specifically, hinge pins, disc studs, pistons, and other mechanical parts may degrade over time, and in some cases, may which might produce a disabling event leading to plant or process shutdown. The primary diagnostic technique in the past has been to disassemble the valves. This procedure is costly, time consuming, and in the nuclear industry, it can lead to radiation exposure in some situations. Additionally repair and reassembly of a valve does not ensure proper operation. Non-intrusive diagnostic technologies including acoustics and magnetics with a digital signal analysis allow to evaluate check valve performance without a disassembly and is able to help the user detect degraded valve conditions.

갭 하우스

스토어 엠유유 디자인 스튜디오(STORE MUU Design Studio),비브라포토_요시히로 아사다(사진) 현대건축사 2016 월간 CONCEPT Vol.- No.213

Measurement of the Shape in the Radioactive Area by Ultrasonic Wave Sensor

Kook Nam Park,Chuel Muu Sim,Chang Oong Choi,Chang Hee Lee,Jong hark Park 대한기계학회 2002 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.16 No.7

HANARO (High-flux Advanced Neutron Application Reactor) has been operated since 1995. The Cold Neutron (CN) hole was implanted in the reflector tank from the design stage. Before a vacuum chamber and a moderator cell for the cold neutron source are installed into the CN hole. it is necessary to measure exactly the size of the inside diameter and thickness of the CN hole to prevent the interference problem. Due to inaccessibility and high radiation field in the CN hole, a mechanical measurement method is not permitted. The immersed ultrasonic technique is considered as the best way to measure the thickness and the diameter of the CN hole. The 4-Axis manipulator was designed and fabricated for locating the ultrasonic sensors. The transducer of an ultrasonic sensor having 10M Hz frequency leads to high resolution as much as 0.03mm. The inside diameter and thickness of 550 points of the CN hole were measured<br/> using 2 channel ultrasonic sensors. The results show that the thickness and inside diameter of the CN hole is in the range of 3.3-6.7㎜ and ? l56-165㎜. respectively. This data will be a good reference for the design of the cold neutron source facility.<br/>