Some damages were found at the forks of low pressure turbine blades caused by random vibration and steam-flashback vibration. In this study, for the aim of fatigue property improvement, laser peening technology for 12Cr stainless steel was developed and material properties were examined. Laser peening is a process to induce compressive residual stress to the material surface. Fatigue specimens which simulate the stress concentration zone of forks were fabricated and laser peening was applied to the su...
英字タイトル:
Development of laser peening technology for low pressure turbine blades to improve fatigue properties

NRA demands that specific safety facility (SSF) shall be built because of the lesson and learn of the accident in the Fukushima Nuclear Power Plant. As for the completion of SSF, the postponement of five years was permitted from the enforcement of the regulation. However, it is the difficult situation to end SSF construction in the grace period by the delay of reviewing application documents. Therefore Japan society of maintenology demands the extension of the grace period on the regulation side and, o...
英字タイトル:
Issues of specific safe facility and short-term countermeasures.