There is a line running from the customer area into the reactor, and it's apparently and supposedly carrying a whole lot of water.
Rossi claims it is carrying steam, but I am pretty sure it is water.
My understanding is that the interface to the customer area was through a heat exchanger. [I don't have the reference at hand].
Nope, it is just a pipe exiting the room, as Rossi explained to Lewan.
Calorimetry can be done on the primary circuit without the need to know what's on the secondary.
There is only one circuit, and as I.H. explained the instruments in it are unsuitable.