Modular Sludge Lancing Equipment for Mushroom Type Steam Generators of Pressurised Heavy Water Reactors (PHWRs)

摘要

Periodic sludge lancing enhances steam generator life by mitigating corrosion between its tubes and tube sheet. The present modular sludge lancing equipment has been designed to dislodge and remove sludge from secondary side of tube sheet of mushroom type steam generators of PHWRs. This equipment comprises of a dosed loop De-mineralised Water Circulation System (DWCS), high-pressure remote lancing Jet Manipulator Assembly (JMA) and Remote Visual Inspection System (RVIS). This entire system including JMA & RVIS is monitored and maneuvered by electronic instrumentation and PLC based supervisory control units.