It Is a well-known fact that Andrea Rossi’s E-Cats and Hot Cats do not present a radiation threat. The only radiation is via gamma rays, which are contained. The gamma rays stop immediately if the unit overheats and melts the nickel within the unit, and when the unit is shut down. However, there have been some questions about the hydrogen within the reactor.
Steven Karels recently asked Rossi if there was a way to shorten the 2 hour shut down time. He asked:
“…it takes two hours to shutdown an eCat running at full output. Is there a feature to quickly quash the reaction, such as using excessive amounts of water to bring the reactor below the temperature needed for the reaction to occur? I know you could also release the hydrogen within the reactor but that seems unsafe to me.”
Andrea Rossi’s response was that it actually takes closer to 4 hours to shut down the unit safely. Then he said:
“Yes, we can cool down the reactor with the cooler in the primary. The release of hydrogen is not dangerous because the amount is minimal (grams).”
First of all, this is the first I’ve heard of cooler in the primary, so it seems like a new bit of design & technology information has been released. It is also reassuring that the hydrogen presents no problem. Even in a 1 MW unit, if all hydrogen were released from all of the units, the result would present no danger.