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Patricia, In a PWR the purpose of a Pressurizer is to allow for thermal expansion of the reactor coolant system and to control the pressure in the same system. The pressure is increased by electrically heat and boil the water in the pressurizer and decreased by spraying reactor coolant in the...

Thank you Patricia, My experience of a typical PWR pressurizer level pot made of a standard 2" Tee is that it will fill completely with hydrogen in less than a day. This will mean a lot of venting. It is easy to calculate the transport of gases to the pot by multiplying the steam flow (typical...

Non condensible gases may disturb dp level measurement in pressurizers or reactor vessels. The reason is accumulation of non-condensible gases in the dp condensate pot and dissolution of the gases in the reference leg. At pressure transients the gases might come out of solution and cause...

An additional comment. There is a very simple way to find out if the condensate pot has a high contet of non-condensible gases. Measure the temperature of the pot surface! If there are no gases the steam temperature in the pot is equal to the steam saturation temperature at the pressure you have...

This level indication error is well known in the nuclear industy where errors during a pressure transient is important to nuclear safety. I would believe that your error is due to accumulation of non-condensible gases in the condensate pot which leads to a reference leg saturated with gas. At...