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Name: Rajesh
Status: Student
Age: 20s
Location: N/A
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Date: N/A


Question:
I have been assigned the task of developing a variable frequency drive for the blowers in nuclear power plant.the blowers are the integral part of the supply and exhaust system of the nuclear plant.their control should take into account various factors like pressure, temp, moisture content, oxygen content(should be maintained at very low levels)and set the atmospheric conditions accordingly . i need you to suggest design aspects for the feedback control of these factors and interlink it with the variable frequency drive.



Replies:
Depending on which bldg. at a nuclear plant you are talking about (containment bldg., auxiliary bldg., fuel handling bldg., etc.) there could be several different feedback parameters you need to consider. If you are dealing with a bldg. that needs to maintain a negative operating pressure (to keep the bldg. air inside to keep any possible airborne radiation confined within the bldg.) then you need to have pressure monitors that will provide feedback on whether you have a pressure spike in the bldg. air pressure, etc.

Also, you may want to have feedback to your controller from the area radiation monitors within the bldg. If the monitors sense an abnormal radiation reading within the bldg. it could indicate there is some kind of system malfunction and you may need to restrict air flow or terminate it totally within the bldg. or the plant in general. You may want to have feedback from any HEPA filters on the air handling system. If these filters get blocked, it could be due to several reasons (besides poor maintenance, etc.), but you need to have an interlock to your air handler motor to detect whether you need to restrict air movement, etc.

These are only a few constraints. If you go to the U.S. NRC homepage and call up their documents dealing with plant HVAC systems, you may get some more ideas to work with. Have to go now!

John F. Suermann



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