What is the purpose of inlet manifold inside calandria? What is the material used for that?

What is the purpose of inlet manifold inside calandria? What is the material used for that?  
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1 Answer

Answer :

The purpose of inlet manifold is to introduce heavy water to the calandria with low velocity to avoid mixing. That is stratified flow of D2O is obtained b inlet manifold. Thus the temperature is kept minimum. It is made of zircalloy. 
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