Risk evaluation of hydrogen fueling station is one of the important items to achieve and spread Fuel Cell Vehicle in the near future. Identified risk shall be control and mitigate by taking an appropriate measure. This is key procedure to establish the project. For the implementation of risk evaluation for commercial size hydrogen fueling station constructed at urban area. It is recommended, risk evaluation is done by zone of area, personnel involved design, construction & operation, and equipment including safety integrity level, respectively. Below is an approach for safety assessment. ・Perform safety assessment before construction begins─during design phase. ・Review construction location and system design against latest code and standard concerning hydrogen infrastructure. ・Develop reasonable scenarios describing process upsets, human errors, system failures, etc by FMEA or HAZOP. ・Identify and correct construction and existing code problems and deviations. ・Control and mitigate risks.

The aims of this study were two folds；to investigate the reliability and validity of the 40─item Safety Behavior Scale, and to clarify the scores of this scale in many occupations among employees working in railway companies in Japan. Participants were 717 Japanese railway workers（704 men, 8 women, 5 not ascertained）who answered a self ─reporting questionnaire that assessed employee's safety behaviors in November to December 2002. Exploratory item factor analysis could divide Safety Behavior Scale into five subscales that were communication about safety, daily safety activity, keep own safety, keep own equipment safely, and seek information about safety. Cronbach's alpha reliability coefficients of these five subscales were 0.85, 0.86, 0.76, 0.78, and 0.70, respectively. On the other hand, validity which were indicated by goodness of fit indexes by confirmatory item factor analysis were acceptable；GFI＝0.88, AGFI＝0.86, CFI＝0.88, and RMSEA＝0.049. These findings suggest that the Safety Behavior Scale could be a reliable and valid instrument for assessing worker's safety behavior. Next, we classified participants into ten groups according to their job types；safety staff（N＝42）, station staff（N＝92）, motorman（N＝82）, conductor（N＝29）, vehicle inspection（N＝61）, electricity（N＝83）, signal & correspondence（N ＝60）, trackman（N＝125）, construction（N＝23）and others（N＝31）. Analysis of variance showed that motormen took higher safety behaviors, such as daily safety activity, keep own safety, keep own equipment safely, and seek information about safety, than other occupations. Also, employees responsible for safety operations kept own safety and sought information about safety rather than conductors. From these results, occupational differences may have to be considered when studying about safety behaviors.

Oxidative decomposition of colored waste water containing p ─NT or p ─NP was studied by the electrolysis method, photocatalysis method and the hybrid method of photocatalysis and electrolysis. All the three methods decolorized these waste water. The nitro group was changed to nitrate ions in the oxidative decomposition. As the reaction products, lower fatty carbonic acids like malonic acid or citric acid were formed. These intermediate products were oxidized to carbon dioxide and water by the hybrid method. It was observed that the combination method treated the waste water more rapidly than the electrolysis or photocatalysis methods. It was suggested to be the synergetic effect that the hybrid method seemed to produce much more active species than the electrolysis or photocatalysis methods.