RESPONSES OF ICHTHYOPLANKTON 



797 



25.65-mm ID CONDENSER TUBE, 15.24 m LONG 



PUMP 1 



950-LITER 

 TANK 



or 



< 



© 



■\ 



ji 



^ 



HYPOCHLORITE 

 TANK 



© 



PUMP 3 



I 1 



© 



^ 



INJECTION i& p(?jN__mj 

 STATION^ ^ ^^ 



in 





-ADJUSTABLE 

 -SECTIONS 



W 



PUMP 2 



50.8-mm STAINLESS- 

 STEEL PIPE 



PLANKTON 

 NET 



DRAIN DRAIN 

 BIOTA COLLECTION TANKS 



Fig. 1 Schematic diagram of the power-plant condenser-tube simu- 

 lator. A, source tank; B, injection station for organisms; C, 

 flow-splitting unit; D, biocide injection system; E, condenser tubes; 

 F, fiber-glass collection-tank system with plankton nets; G, area of 

 the simulator where height adjustments are made. Various gauge 

 positions are noted. 



15.24-m lengths of type-304 stainless steel arranged in two hori- 

 zontally displayed, U-shaped loops (E); the inner loop has a 1.38-m 

 radius and the outer, a 1.69-m radius. Pressure and temperature 

 gauges are mounted on the discharge ends of the condenser tubes. 



Water exiting the condenser tubes flows downward through 

 vertical pipes positioned centrally over a collection system (F) 

 consisting of dual 200-liter fiber-glass cylinders containing 0.5-m 

 conical plankton nets (STl-jU mesh). The vertical piping has manually 

 operated valves that can cause the flow to by-pass the collection 

 tanks and move directly to the drain to facilitate removal of the nets 

 without additional buffeting from the flow. 



Heating System 



As in power-plant condenser systems, water is heated during a 

 single pass through the simulator. Each tube is embedded in 

 machined, octagonal, aluminum blocks with grooves cut into their 

 surfaces to accommodate electrical resistance heaters. The power to 

 the heaters is supplied independently to each condenser tube. At 



