1.緒言 東日本大震災以降、規制要件の強化や電力市場の自由化等、電力業界を取り巻く環境は大きく変化し、高品質かつ低廉な電力の供給が求められる。電気事業者としては、設備の安全(信頼)性の維持・向上と効率的な業務 運営の両立のため、保全の最適化に取り組んでおり、保全の有効性評価をこれまで以上に機能させていくことが重要となる。 今回、保全の有効性評価をより実効的に行う取組みとして、関西電力グループで実施した保全最適化の活動を紹介する。 2.保全最適化の取組みの概要 関西電力の原子力発電所における保全活動において......
英字タイトル:
Approach toward Maintenance Optimization by Kansai Electric Power Co.

We have developed the constant incident angle method to inspect pipes by using high power square burst wave in non contact air upled ultrasonic testing (NAUT). We also succeeded to scan the effective guided wave propagat ed circumferentially in pipes. This per describes the optimum frequency, incident angle, the selection of prob es and examples of detecting image pictures with the onstant incident angle focusing method using focus probe....
英字タイトル:
evelopment of Inspection Method for Pipes by Non Contact Air Coupled Ultrasonic Testing

We have not yet known the nondestructive detection method to determine each quantity of the object which Uranium and Plutonium is mixed in, such a w aste generated from nuclear fuel cycle facility, and so radioactive intensity of Pu-239 is 10,000 times as much as U-235. Therefore, on radioactive assessment, it is important to precisely quantify each mass. Then we paid attention to the component of delayed and prompt neutron obtained by 14 Me V neutron direct interrogation method and so developed the new me...
英字タイトル:
Research for determination of elemental ratio between Uranium and Plutonium by Non-destructive method

The degradation of 1-nozzle type Jet Pump (JP) efficiency by crud deposition has been recognized in some BWRs. In order to remove crud, we must clean each o r all of JP inner surface. The increase in cleaning surface area induces the increase in outage period and cost, therefore, in the previous study we looked for the most effective cleaning portion at inner surface for efficiency recovery. In this study, for the 5-nozzle type JP, we evaluated the effect of crud portion on decrease in efficiency of 5-noz...
英字タイトル:
Studies on Recovering Method of 5-nozzle type Jet Pump Efficiency