Refracted angle for UT of axial groove type rotor is limited with the distance of the axial direction from the sensor installation surface. High intensity detection technique changes with the refracted angle, the change may require a combination of multiple inspection techniques. For this reason, detectable distance of a double probe technique and a tip echo technique are examined. In the distance more than 35mm, refracted angle become more than 35 degrees where refracted intensity is high and the defe...
英字タイトル:
Development of Ultrasonic Testing Method for Axial Groove Type Steam Turbine Rotor

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...
英字タイトル:
AC Estimation code and Risk Evaluation Based on the Code