North Anna-

1.)    Primarily SRD's however we will back that up with stay times and a REM 
ball in case we get an anomaly with the SRD which has happened.

2.)    No specific criteria other than what's stated above.

3.)    No

4.)    Yes we have an AmBe source and we track exposure when using that source.

5.)    It depends.  The Equipment hatch area is surveyed Monthly. The ISFSI 
interior is surveyed when we add a canister and then the perimeter is surveyed 

From: Powernet [] On Behalf Of Beth 
Heyeck via Powernet
Sent: Monday, April 16, 2018 3:35 PM
Cc: Beth Heyeck
Subject: [External] [Powernet] Neutron dose tracking

We are looking at streamlining our neutron dose tracking and are wondering how 
other plants are performing it.

1.      Which do you use for determining neutron dose for workers in Neutron 
Exposure Areas:

a.      Stay time tracking

b.      Gamma to neutron ratios

c.      Neutron sensitive SRDs

d.      Other

2.      Do you have specific criteria for using any of the above?

3.      Are there any exemptions to tracking neutron doses in Neutron Exposure 
Areas, and how are those documented?

4.      Do you track neutron dose outside of Neutron Exposure Areas/when 
handling neutron sources?

5.      How often do you perform neutron surveys of Neutron Exposure Areas?

Elizabeth Heyeck, CHP
Senior Health Physicist
D.C. Cook Nuclear Plant

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