For application of the FAC code to system safety analysis, a 1D FAC code was developed by applying 1D mass transfer coefficients and geometry factors, which could prepare for not only the probability of serious wall thinning occurrence but also a hazard scale for pipe rupture could be analyzed. FAC risk was defined as the mathematical product of the possibility of wall thinning occurrence and its hazard scale. The local maximum thinning rate could be predicted with accuracy within a factor of 2 with th...
英字タイトル:
Future Subject for Its Application to Plant System Safety Analysis

FAC risk has been defined as the mathematical product of the possibility of wall thinning occurrence and its hazard scale. The possibility of wall thinning occurrence was designated as the time margin for pipe rupture determined by applying a one-dimensional FAC code, which could predict wall thinning rate with an accuracy within a factor of 2, while the hazard scale was defined as the volume of effluent steam and water from the ruptured mouth, which was enthalpy of water originally flowing in the pipe...
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AC Estimation code and Risk Evaluation Based on the Code

In order to improve safety of major equipments in nuclear power plants, an advanced FMEA (Failure Mode and Effect Analysis) was developed which was integrated PFM (probabilistic fracture mechanics) into the proven FMEA by evaluating the risk priority number in maintenance management based on a trio of anomaly occurrences in equipments (O), their severity (S) and their detectability (D). The results of equipement risk evaluation were visualized by evaluating the triangle area in the radar chart of three para...
英字タイトル:
Development of Visualization Method of Risk for Maintenance Management

量子科学技術研究開発機構（量研）は、文部科学大臣から ITER計画における国内機関、BA活動における実施機関の指定を受けて、国際研究協力プロジェクトである ITER計画及び日欧協力による BA活動を実施している。 本稿では、我が国における核融合エネルギー開発の中核的事業である ITER（イーター）計画、及び同計画を支援・補完し、核融合エネルギーの早期実用化に向けて実施している幅広いアプローチ（BA）活動の全体像を概説する。...

In order to establish safe and reliable plant operation, it is required to forecast future troubles on structural materials based o n combined analyses of flow dynamics and corrosion and to mitigate them before they become serious on plant operation. In the prese ntation, discussion is focused on wall thinning of major pipes due to single and two phase flow. FAC (flow accelerated corrosion) is considered for wall thinning in single phase flow, while LDI (liquid droplet impingement) is evaluated for that in...
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Development of Evaluation Method on Flow-induced Vibration and Corrosion ofComponents in Two-phase Flow by Coupled Analysis - 3Evaluation of Wall Thinning Rate in Single and Two Phase Flow with the Coupled Model ofFlow Dynamics Analysis and Corrosion Analysis

Wall thinning rates due to FAC were calculated with the coupled model of static electrochemical analysis and dynamic double oxide layer analysis at the identified danger zone. Anodic and cathodic current densities an d ECPs were calculated with the static electrochemistry model and ferrous ion release rate determined by the anodic current density was used as input for the dynamic double oxide layer model. Thickness of oxide film and its characteristics determined by the dynamic double oxide layer model wer...
英字タイトル:
Development of Evaluation Method on Flow-induced Vibration and Corrosion ofComponents in Two-phase Flow by Coupled Analysis -5Evaluation of Wall Thinning Rate with the Coupled Model of Static Electrochemical Analysis and Dynamic Double Oxide Layer Analysis

In order to evaluate the thinning rate of pip ing in feedwater drain systems in which , a n ew methodology is proposed in which the effe ct of oxidation of piping wall is considered....
英字タイトル:
Development of Evaluation Method on Flow-induced Vibration and Corrosion ofComponents in Two-phase Flow by Coupled Analysis-6Model for wall thinning rate of piping attached with two-phase flow