At Oconee, we had to do the same thing, update the computer boron concentration code. We have a RETRAN model of the RCS which was updated with the new RV head and SG information and then we updated the computer. If you don't have your own RETRAN model or the like, you might be able to get the information from the vendor that does your transient / accident analysis. In general, the changes were small and had little effect.

Carl D. Fago, Supervisor
Oconee Reactor Systems Engineering
Phone: 864-885-3047
cdfago@duke-energy.com

-----respvr-bounces@keffective.com wrote: -----

To: <respvr@keffective.com>
From: "POHL, MATTHEW H" <mpohl@oppd.com>
Sent by: respvr-bounces@keffective.com
Date: 11/07/2005 02:33PM
Subject: [Respvr] Boration/Dilution Calcs

Afternoon,

Fort Calhoun Station is replacing its S/Gs, Pressurizer, Reactor Head, etc... during the Fall 06 Outage.
Even though we've hammered out most of the hard details, we are still having some difficulties with some low-hanging fruit.

One of these is locating 30 yr old basis information for the boration/dilution equations used on the plant computer. There are some constants used in the equation that are tied to volume yet we can't generate a good basis for the values. As a result, we are probably going to generate our own equations with supporting basis documentation.

If you would please supply us with any of your calcs and basis information, we would like to compare them and generate our equations using a standard methodology if one even exists ...

Any input in this area would be appreciated...
Thanks,

Matt Pohl
Principal Reactor Engineer - Operations
Fort Calhoun Nuclear Station
(402)533-6820 (work)
(402)561-3864 (pager)

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