Author(s)

N. R. Rogers

Abstract

The abstraction, circulation and discharge of large volumes of water is essential for the generation of electricity by power plants utilizing open circuit, once through, cooling. However there is increasing awareness of the impact of this process has on aquatic life through entrainment of fish and other biota in the water intake channels and impingement on the screening elements. This paper reviews some technologies applicable to large cooling water intakes to mitigate the impact of the abstraction and screening (filtering) of cooling water and this is illustrated by two example power plant projects recently constructed in the UK, encompassing abstraction flows up to 40 m3/sec. In particular, the key features of Fish Recovery and Return (FRR) systems for Band and drumscreens is described and the benefit of combining screens fitted with a FRR system with an upstream \“behavioural screens” based on Acoustic Fish Deflection (ADF) technology will be discussed. An outline of some areas for future development work will be given. Keywords: cooling water intakes, screening, bandscreen, drumscreen, fish recovery and return, acoustic fish deflection, behavioural screens.

Keywords

cooling water intakes, screening, bandscreen, drumscreen, fish recovery and return, acoustic fish deflection, behavioural screens.