Although the secondary loop of a PWR is a closed loop but some noncondensible

Although the secondary loop of a PWR is a closed loop but
some noncondensible gases are entrained into the secondary
feedwater. Write three probable sources of these
noncondensible gases.

Question Posted / medi88

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Although the secondary loop of a PWR is a closed loop but some noncondensible gases are entrained ..

Answer / aamir shahzad sohi

1-addition of ammonia and hydrazine
2-vaccum of condenser ( possibility of air intake due to
negative pressure)
3-corrosion in path(piping,hx,HP and LP heaters)
4-make up of demin water containig Free ions

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