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To: multicollinearity who wrote (67128)3/5/2001 4:34:39 PM
From: jim kelley  Read Replies (1) | Respond to of 93625
 
Westinghouse sold pressurized water reactors. These were designed to provide higher power density for a given size core than a boiling water reactor. But they relied more heavily on cadmium rods for neutron absorption. The neutron flux and power production is then controlled with the control rods.

In order to eliminate bubbles (voids) in the PWR the pressure has to be elevated inside the core. I do not believe there have been any incidences of the TMI type with BWR's.

The water coolant does not become radioactive ordinarily.
If there are cracks in the Zirconium clad fuel rods fission gasses can get into the water. If the system is closed cycle those gasses will not escape into the surrounding environment.