[ RadSafe ] Kr-85

[JGinniver at aol.com]

In a message dated 23/09/2005 22:45:11 GMT Standard Time, rah at america.net  
writes:

The  charcoal bed trains were commonly installed on the ehxaust from the
steam  jet air ejectors of GE BWR's, the exhaust bieng mixed with other  more
dilute air streams prior to release.



Thanks for the information.  Unfortunately I don't have any experience  of 
BWR plants so I find this information quite useful.  I was basing my 90  days of 
delay and decay on a late model SNUPPS PWR.  A low flowrate of  gas 
(including radioactive noble gases) is constantly drawn from the reactor  coolant and 
is passed through a number of large charcoal beds before  discharge through a 
stack.  On this plant the gas wasn't diluted with any  other ventilation before 
discharge, and (again if I recall correctly) the flow  rate was between 1 and 
2 m3 per hour.
 
Am I correct in thinking that the steam jet air ejectors are what I might  
call Condensate Air Extraction Pumps on the Turbine Condenser and are  used to 
maintain a vacuum on the condenser to assist the overall steam cycle  
efficiency? 
 
Regards,
Julian