アレイ型プローブを用いた SG 二次側管支持板監視手法の開発
Development of Monitoring Method for SG Secondary Side Tube Support Plate Using Array Probe
著者:
小橋 優司 Yuji KOHASHI 七田 知紀 Tomonori SHICHIDA 川瀬 直人 Naoto KAWASE 松浦 貴之 Takayuki MATSUURA 川田 かよ子 Kayoko KAWATA
発刊日:
公開日:
Array probeECTIntelligent ECTMonitoring methodScale blockageSteam Generator
概要
Array ECT probe called Intelligent ECT probe (I-Probe) has a capability to inspect tubes of Steam Generator (SG) more productively and more accurately than conventional probes. It has been applied as full length inspection in Japan since 2003 and there is much field experience to date. On the other hand, a phenomenon in SG secondary side is known that scale deposits on the clog holes of quatrefoil type tube support plate(TSP). Water level oscillation of secondary side caused by excessive blockage of scale deposits may decrease operation efficiency and it will cause one of the unintended troubles. Therefore, periodical monitoring of blockage condition and applying cleaning are important. The new method has been developed to evaluate blockage condition of every tube support plate of all tubes automatically using I-Probe data. The software was also developed to visualize the evaluation results. This new method will contribute increase of reliability of SG maintenance, because the new method makes it possible to monitor the whole SG more precisely.
