[Global] Micron Filters

Thu Oct 21 07:33:31 EDT 2021

Not used at North Anna

From: Global <global-bounces at list.rpalara.org> On Behalf Of Lopez, Rouell A:(Exelon Nuclear)
Sent: Thursday, October 21, 2021 7:22 AM
To: global at list.rpalara.org
Subject: [EXTERNAL] [Global] Micron Filters

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Good Morning,

Looking for information for the following:

For PWRs:

  1.  Has your station used 0.05 micron filters in your letdown/CVCS system?    If yes, are these filters located before or after your letdown ion exchangers?

  1.  Did you experience any issues with unexpected rapid loading of the filters causing high differential pressure?    If yes, did this result in any operational challenges other than having to remove the filter from service?

  1.  Have you experienced issues that have resulted in your plant no longer using the 0.05 micron filters?   If yes, what was the smallest micron filter you replaced them with?

Thank you ahead of time for your responses.

Stay Safe

Roy Lopez
Rad Engineer - Sr. ALARA Specialist
Radiation Protection
Exelon Nuclear
[EXG_H_RGB_PS_72dpi-01]
Calvert Cliffs Nuclear Power Plant
1650 Calvert Cliffs Pkwy, Lusby, MD 20657
Office:410-495-3840 | Mobile: 410-474-9084
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