Austenitic stainless steels are widely used as structural materials in many industries. However, stainless steels are susceptible to crevice corrosion in the solution including chloride ions. In this paper, at first, the most inhibitive anion against corrosion was investigated by anodic polarization measurement of type 316L stainless steel in the solution containing Cl- with candidate inhibitive anions (WO42-, MoO42-, VO3-). MoO42- was adopted as the most inhibitive anion in this study. Next, the effec...
英字タイトル:
Effect on critical potentials for crevice corrosion initiation and repassivation of stainless steel by addition of inhibitive anion

In 2012, there are 50 commercial nuclear power plants in Japan. There are 20 nuclear power plants which are working for 30 ye ars or more. It is very important to measure the aged deterioration of the cable used in those nuclear power plants. Generall y, degradation of a cable was measured by the tensile test. It was difficult to measure an electrical property quickly and n ondestructively. We developed the nondestructive measurement technology of cable degradation which used microwave technology....
英字タイトル:
Ageing study of cable insulation by means of microwave absorption method

This paper discusses an improvement of the quantitative method to evaluate the reliability for the naintenance plan with respect to the risk impact both for CDF (Core Damage Frequency) and Plant T rip requency. The quantitative approach includes the considerations for the effect of the Condition Based Taintenance (CBM) changing in addition to the Time Based Maintenance (TBM), and the reliab ility for the naintenance plan is evaluated using component failure rate which is presumed from experimental naintena...
英字タイトル:
A Study for the Reliability Evaluation Method for the Maintenance Plan Using the Risk Information II? Part 2: An application example of the evaluation method of failure ratebased on degraded state analysis of component part ?