RE: N-16 in coolant

["Kanter, Seth J(Z55008)" <SKANTER@apsc.com>]

Lester,

Not sure if your referring to Eric's numbers from (SONGS) or mine from
Palo Verde.  While your assertion about optimizing flow rate and heat
transfer to make power are correct, our situation would seem to
contradict this, e.g., RCS flowrate = 110,000 gpm with a Rx Core thermal
output of 3890 Mwt which produces a net electric output of 1270 Mwe.

Seth.
>----------
>From: 	Lester.Slaback@nist.gov[SMTP:Lester.Slaback@nist.gov]
>Sent: 	Monday, July 28, 1997 1:59 PM
>To: 	Multiple recipients of list
>Subject: 	Re: N-16 in coolant
>
>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>
>
>
>
>-- 
>the above are the personal musing of the author,
>and do not represent any past, current, or future
>position of NIST, the U.S. Government, or anyone else
>who might think that they are in a position of authority.
>NBSR Health Physics
>NIST
>Gaithersburg, MD 20899
>301 975-5810
>-----------------------------------------------------------
>Lester.Slaback@nist.gov
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>
>