A118 給水加熱器加熱管肉厚評価について(検査・モニタリング-2(減肉関連),OS-6 保全・設備診断技術(2),一般講演,地球温暖化防止と動力エネルギー技術)

概要

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With regard to High Pressure(HP) feed water heater of thermal power plant at Tokyo Electric Power Company(TEPCO) sites, inspection of Feed Water(FW) tubes wall thickness are conducted whenever required such that frequent tube leak occurs.As a standard inspection methodology, FW heater is disassembled during planned outage, tube wall thickness is measured by UT, then install plugs at the both end of FW tube if its measured wall thickness is found below calculated threshold.However, the root causes of wall thinning of FW tube are various such as erosion and corrosion, based on wall thinning condition, the above threshold is not applied but utilizing the other technically well-grounded evaluation method is sometimes more rational.Therefore, TEPCO classified wall-thinning condition based on inspection data and established technically well-grounded and rational evaluation methodologies of FW tube wall thickness to suite each wall thinning condition.Moreover, with recent improvement of inspection technique, technology enabled faster, larger amount, and more accurate data acquisition, TEPCO has developed the systematized evaluation methodology that can transact data acquisition and evaluation simultaneously.This article introduces the logic of evaluation methods and examined algorithms to make them systematized.
社団法人日本機械学会の論文
2008-06-18