Corrosion of power station generators

How is corrosion control achieved in a steam generator?

Corrosion control of steam generators under operation and during plant outages is attained by proper design, adequate material selection and control of water chemistry in the entire secondary cooling circuit.

Why do steam generators have corrosion problems?

Accumulation of deposits in steam generators is a main factor involved in both secondary side corrosion problems and the occurrence of FIV caused wear. For this reason, it is important that plant designs and operating practices minimize the introduction of corrosion products into the steam generators. As indicated above.

Why is corrosion monitoring important in power plants?

Regular Corrosion Monitoring and assessment is essential for safety and performance of the power plants. Remember, we need to consider life cycle cost of corrosion management against the possible losses accruing on damages to plant components.

Does PWSCC affect Alloy 600TT steam generators?

Alloy 600TT steam generators have already been affected by some amounts of PWSCC in some instances. It is likely that additional amounts of PWSCC may occur, making it necessary to address this possibility in the life-cycle management of these steam generators. (7.3.14. Secondary side corrosion: General)

Will new PWR steam generators be made using alloy 600mA tubing?

It is assumed that new PWR steam generators will be made using one of the three alloys, but it is noted that those remaining steam generators with Alloy 600mA tubing have been or are likely to be affected by PWSCC (Pitting and Corrosion Creep), making it a corrosion mode that will require management.

What are the problems with generator water cooling?

With generator water cooling only few problem areas related to corrosion and deposits have emerged in more than 50 years of history. The most common and severe problem is plugging of copper hollow conductors.