37th Annual CNS Conference - 2017 June 04-07

Presented at:
37th Annual CNS Conference
2017 June 04-07
Niagara Falls
Session Title:
1B5 - Reactor and Radiation Physics (II)

G. LeRoy (GL Nuclear Inc.)
A. Sullivan (OPG)


The adjuster shim mode of operation was recently re-introduced at Darlington NGS, leading to prolonged operation with atypical reactivity device positions and flux shapes. It was recognized early on that accurate predictions of core parameters and transient effects during this new mode of operation would be important for reactivity management and licence compliance.  The SIMULATE module of RFSP having bulk and spatial control reactivity capabilities was employed to supplement SORO—the steady state core tracking code used at Darlington NGS.

There are multiple options available in the SIMULATE module of RFSP for simulating Reactor Regulating System (RRS) spatial control. Two of these are more realistic: Option 3, which is typically used for simulating spatial control in Candu 6 reactors; and Option 4—the ‘Darlington’ spatial control option. To support shim mode operation at Darlington, inputs to the ‘Darlington’ spatial control option were optimized to closely emulate RRS spatial control action at the station. 

This paper compares the accuracies of RFSP spatial control simulations of Darlington shim mode operation using the optimized D-card and the spatial control Option 3. The effect of shared Fully INstrumented Channels (FINCHs) on Darlington spatial control is discussed as well.

Individual Conference-Paper Copies (Electronic Where Available):

  • For CNS members, the first 5 copies per calendar year are free, and additional copies are $10 each.
  • For non-members, the price is $25 for the first Conference-paper copy in a request, and $10 each for additional copies of papers in the same conference and in the same request.
  • Contact the CNS office to order reprints.