Re: N-16 in coolant

[Lester.Slaback@nist.gov]

These two replies indicate that coolant flow returns to the reactor in
less than a halflife, i.e., <6 sec.  This seems like a very high flow rate
given the  desire to transfer heat and make power.

If the flows are this high then there must be a significant neutron term
from N-17.

Just curious.
***************************

Also, pages 520 - 524 of the 2nd edition of Lamarsh's "Introduction to
Nuclear Engineering" gives the formula for determining this number and,
for a reactor with a power density of 55 watts/cm^3 in which the coolant
is in the reactor for three seconds and outside the reactor for two
seconds, the N-16 equilibrium activity is 249 uCi/cm^3.

Sorry I can't be more specific.

Ben

>ben.morgan@cplc.com
>

 "ERIC GOLDIN" <goldinem@songs.sce.com> said:

>     Jim Barnes asked for N-16 equilibrium in coolant.
>     
>     From our Final Safety Analysis Report (FSAR) for a large (1100 
>     MWe) Pressurized Water Reactor, the following table for N-16 
>     activity:
>     
>        LOCATION        ACTIVITY (dps per cm3)
>     Outlet nozzle       4.84E6
>     Outlet line         4.73E6
>     Steam generator     3.80E6
>     Pump                2.88E6
>     Inlet line          2.76E6
>     
>     All calculated rather than measured of course.
>     
>     Eric Goldin
>     <goldinem@songs.sce.com>



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Lester.Slaback@nist.gov
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