Treatment of High Pressure Difference of RRI/SEC Heat Exchanger in Daya Bay Nuclear Power Station

This paper have analyzed the reason of high pressure difference of RRI/SEC heat exchanger inDaya Bay nuclear power station,by adopting the Root Cause Analysis method（RCA） and the analysis matrixof failure mode.After few experiments have been done on the SEC system,we confirm the reason of theexchanger failure.Through modifying the method of adding chemicals to SEC system,the exchanger failureis solved satisfactorily.Two years of operation indicate that the 8 exchangers ever with failure can operatesatisfactorily,and the pressure difference is in the normal range.