What are common impurity sources described for boiling water reactors (BWRs)?

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Multiple Choice

What are common impurity sources described for boiling water reactors (BWRs)?

Explanation:
In BWR water chemistry, the focus is on impurities that drive corrosion, radiolysis effects, and deposits on reactor components. Dissolved oxygen stands out because it is a strong oxidizer that readily attacks metal surfaces, promoting corrosion of stainless steels and other alloys used in the reactor internals; keeping oxygen down is essential to limit corrosion rates. Sulfates are another concern, coming from trace impurities or cleaning processes; under reactor conditions, sulfate-related species can contribute to corrosive attack and deposition, so controlling sulfate levels helps protect surfaces and reduce buildup. Ammonia is used in the plant to help control the pH of the feedwater and condensate system, buffering the water to a more alkaline state, which reduces corrosion of metal surfaces. Together, these three—dissolved oxygen, sulfates, and ammonia—are commonly described as impurity sources in BWRs because they directly influence corrosion behavior and water chemistry management.

In BWR water chemistry, the focus is on impurities that drive corrosion, radiolysis effects, and deposits on reactor components. Dissolved oxygen stands out because it is a strong oxidizer that readily attacks metal surfaces, promoting corrosion of stainless steels and other alloys used in the reactor internals; keeping oxygen down is essential to limit corrosion rates. Sulfates are another concern, coming from trace impurities or cleaning processes; under reactor conditions, sulfate-related species can contribute to corrosive attack and deposition, so controlling sulfate levels helps protect surfaces and reduce buildup. Ammonia is used in the plant to help control the pH of the feedwater and condensate system, buffering the water to a more alkaline state, which reduces corrosion of metal surfaces. Together, these three—dissolved oxygen, sulfates, and ammonia—are commonly described as impurity sources in BWRs because they directly influence corrosion behavior and water chemistry management.

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