A pipe inspection system using ultrasonic guided wave with inter-digital transducer was developed. In this system, for uni-directional transmission, a pair of transducer is set axially on the pipe with a separation of one-quarter of the wavelength, and a one-quarter period delayed anti-phased waveforms are applied to the pair. By this method, the amplitude of the syn thetic traveling wave in the minus direction can be completely decreased to zero in theory. For 50A pipe specimen, artificial discontinuities...
英字タイトル:
A Pipe Inspection System Using Ultrasonic Guided Wave

真庭 一彦 Kazuhiko MANIWA Guided wave inspection technique is effective for detecting defects like corrosion in piping, because it can perform long range inspection. It is possible to expect this inspection as a metho d that leads to the decrease of the inspection process and its cost, because the incidental work can be reduced. Especially, the contraction effect of the inspection work is extensive in larg e-diameter piping inspection. In this paper, we introduce the guided wave inspection system to large-d...
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Wall Thinning Inspection Technique for Large-Diameter Piping using Guided Wave

1. 概要 原子炉格納容器内部調査装置の 開発および実証 ~ 形状変化形ロボット ~ 日立 GE ニュークリア・エナジー(株) 岡田 聡 Satoshi OKADA 石澤 幸治 Koji ISHIZAWA 高橋 良知 Yoshinori TAKAHASHI 国際廃炉研究開発機構(IRID) 遠藤 洋 Hiroshi ENDO 福島第一原子力発電所の廃止措置に向け、 原子炉格 納容器 (PCV) 内部を調査するための装置を開発した [1] [2]。 PCV 内は放射線量が高く、 放射性物質飛散防止の観 点か......

AgX and AgR as radioactive iodine adsorbents were developed. They can be applied to a nuclear emergency. Their good adsorption characteristics have been proved under harsh gas conditions of vent gas. In particular, AgR can work well even in an atmosphere of hydrogen and oxygen coexistence in PWR. Since AgX shows excellent adsorption performance in the minus temperature range, it can be applied to an air clean system. ...
英字タイトル:
Adsorption characteristics and applications of radioiodine adsorbent AgX and AgR

AgX as a radioactive iodine adsorbent has been developed. It can be used in nuclear power plant when a emergency occurs. The experimental results show that the adsorbent has excellent adsorption propertie s even in the harsh gas atmosphere and severe conditions such as high temperature, high humidity and h h pressure. In this report, the adsorption properties for methyl iodide will be especially described....
英字タイトル:
Future of AgX As a Radioactive Iodine Adsorbent

1.フィルターベントの課題 フィルターベントは、福島の様な事故時に大きな役割 を持つ重要な設備として位置づけられておりま主に ドライ方式とウエット方式があり、両者とも被爆防止の 点で非常に有効な方法であります。しかしながら、これらの方法でも除去が十分でなかっ た放射性物質として有機ヨウ素があります。ドライ方式 では、ヨウ素吸着剤として銀ゼオライトを用いることで 軽減を図って参りました。ウエット方式では、一部(CCI 社)の方式を除けば、有機ヨウ素の対策が十分とはなっ ていないのが実情です。有機ヨウ素の発生......
英字タイトル:
Applications of AgX as an Adsorbent for Radioactive Iodine