[Global] Asking for Chemistry Contacts at Plants that Use Nitrogen Overpressure in their Primary M/U Water Tank to Reduce Dissolved Oxygen

[Barber, Jerry M]

I know this is an ALARA forum and I apologize up front for this primarily Chemistry post, but this is a great network and I have not found anything nearly as helpful in the PWR Chemistry world.

I hope that one or more of you will point me to a Chemistry contact at a plant that uses nitrogen overpressure on the tank of water used to provide primary makeup demineralized water at a PWR (mine is called the "PWST") to minimize dissolved oxygen in the makeup water.  I believe this is a fairly common practice but we currently use a tank that is open to the atmosphere with only a bladder to help reduce dissolved oxygen.  Our Reactor Coolant Pump vendor believes reducing dissolved oxygen in makeup water this will allow our RCP seals to last longer between rebuilds - which is ALARA! I would like to know if the higher nitrogen in the resulting makeup water causes higher ammonia and/or any other possible issues associated with primary chemistry.

To minimize any unnecessary traffic on this excellent ALARA forum, I would appreciate replies coming to my email or phone # instead of to this list.

Thanks in advance for any help you can provide.


Jerry Barber
Robinson Nuclear Plant
Jerry.Barber at duke-energy.com<mailto:Jerry.Barber at duke-energy.com>
843-951-1496
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