At Turkey Point, we stop dilution when the Reference Bank gets to 40 steps withdrawn. 

Mark Dicus

Turkey Point Reactor Engineering

305-246-6185

From: pwrrm@retaqs.com [mailto:pwrrm@retaqs.com] On Behalf Of Kenneth R Pike
Sent: Friday, November 12, 2010 8:45 AM
To: pwrrm@retaqs.com
Subject: [Pwrrm] reference bank worth by dilution during physics

For those that measure reference bank worth by dilution during physics
testing, how do you determine when to stop the dilution?

The process for Beaver Valley is to start a dilution with ARO and the
reference bank at near ARO.  The dilution is compensated for by inserting
the reference bank (measured with a reactimiter supplied by the vendor).
The goal is terminate the dilution so that less than 75 pcm is left in the
reference bank.  Contingencies are built in if you "overshoot" to insert
another bank then borate it back out.  Contingencies are also built in if
you come up short of 75 pcm to dilute the bank into less than 75 pcm.  We
have experienced both under and overshoots here which is fine and allowed
by procedure, we are just looking to see if there is a more precise method.

Travis B. Link
Beaver Valley Reactor Engineering
P.O. Box 4 -  Mail Drop A-BV-A
Shippingport, PA 15077
(724) 682-4149 (Work)
(412) 667-1487 (Cell)
(412) 305-3041 (Pager)
(724) 682-4250 (FAX)
tlink@firstenergycorp.com