An algorithm has been developed to detect sabotage, etc. by converting surveillance camera images and rule documents into graph structures by deep learning. In the verification using the demo video, the judgment accuracy of 90% or more was obtained. A basic technology has been established to realize an interface with natural language processing AI with image AI....
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Detection of malicious acts on nuclear security by combining image recognition and natural language processing

Our aim is to develop a technology to suppress the expansion of accident damage by improving the reactor structural resilience as a solution to the problem of restoring the safety function of structures after destruction, which has been an issue since the Fukushima Daiichi Nuclear Power Plant accident. In this research, the visualization method of resilience of nuclear structures was proposed in order to visualize the capacity to mitigate and to recover safety function loss by applying and improving the res...
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Visualization of resilience improvement effect by fracture control technology using resilience index

Two magnetic methods are proposed for the evaluation of initial degradations of type 304 stainless steel in stress corrosion cracking (SCC). The first one is the measurement of the distribution of chromium depletion by means of a magnetic force microscope (MEM). MEM observations are performed for some samples sensitized in various conditions, and the obtained results coincide with the expected ones from the chromium behavior. Moreover, the phase distributions in the solution-annealed and sensitized states a...
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Evaluation of Initial Degradation in Stress Corrosion Cracking by Magnetic Methods

Particularly, Since the on Fukushima the system Dai-ichi safety assessment accident, the of importance plants in operation, of “system the safety” various has degradation been recognized. aspects with transiti on of time ha been emphasized. Accordingly, functional degradation will be the assessment target, reliability and assessment the changes will in the be made safety on codes the consolidation and the concept of of important safety will functions be dealt under with; a where, system, the not on individ...
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Lessons & Learns from Fukushima Daiichi Accident and New Concept of System Safety on Nuclear Power Plants

「地球環境保全に貢献する原子力」をテーマにした第17回学術講演会では、自然災害の激甚化・広域化が急速に進み、脱炭素化社会への移行が喫緊の課題となるこれからの原子力発電の果たすべき役割について考えた。コロナ禍における初のオンライン形式での学術講演会であり、さまざまな分野から幅広い講演者が集結した。 25の技術セッションでは、全国から集まった最新の知見と課題が共有された。学生によるプレゼンテーションは現場の問題意識がどのくらい認識できているかに焦点が当てられ、新設の保全現場からの声セッションでは、保全現場の第一線で働く若手技術者による発表が行われた。 開会式に続いて行われた特別講演、原子力委員長・上坂充氏「原子力を巡る状況について」、元JAXA・川口淳一郎氏「やれる理由こそが着想を生む「はやぶさ式思考法」～時代をひらく組織風土づくり～」、エネ庁・皆川重治氏「原子力政策の課題と対応の方向性について」の概要を報告する。...

The conventional purpose in the field of structural strength has been to prevent damage to design basis events (DBE). For beyond design basis events (BDBE), it is necessary to mitigate the impact on safety on the premise that damage will occur. The authors propose a mitigation method that suppresses the consequence into a fracture mode with a large impact by reducing the load due to a fracture with a small impact on safety. We will introduce the research results for individual component, extend the applicab...
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New approach to beyond design basis events in structural strength field

The total system design on Nuclear Plant ensures “Nuclear safety” with making practically achievable efforts to prevent and mitigate nuclear and radiological accidents. The performance based system design with “Defence in depth (D-I-D)” has been laid out as the key means in “preventing accidents”, “controlling escalation to serious consequences”, and “preventing harmful consequences to the public”. D-I-D is extended to the management of severe accidents, and is an approach intended to provide protectio...
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Concept of System Safety on Operating Nuclear Power Plant

Since the Fukushima Dai-ichi accident, the importance of “system safety'' has been recognized anew. Particularly, system safety assessment of plants in operation from the various degradation perspectives, specifically, transition of time is very important. Accordingly, functional degradation will be the assessment target of degradation, and the changes in the safety standards and the concept of safety will be dealt with; where, the reliability assessment will be made on the consolidation of important func...
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Study of System Safety Evaluation on LTO of National Project - Functional Degradation and System Safety Assessment of Nuclear Plants in Operation

In this study, the new Positive Contrast (PC) method was proposed to emphasize the tumors in MRI images. If the object includes magnetic particles such as S PIO(Super Paramagnetic Iron Oxide), the dark image is obtained because of the MRI's distorted magnetic field by the magnetic particles. This effect appears as the shift of peak position in K-space calculated from the Fourier transform of the sub-area of the MRI images. The tumor-emphasized MRI images were obta ined by selecting only the sub-areas that ...
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Enhancement of Negative Image of MRI by the Positive Contrast Method