Reactor Room Experimental SF6 Tests to Determine Probable Stack Activity Response to Radioactive Releases Page: 4 of 15
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activation. Therefore, any activity release in expected to be
brief almo, and may be simulated as a puff release into the
process room. Thia puff release mods has been modeled in the
emergency response cods to provide information pertaining to the
extent of the incident ma early as possible. If the release is
other than brief, this will be apparent from the monitor response
and could be evaluated accordingly.
A successful mathematical simulation of the monitor response to a
puff release in the process room requires soe knowledge of the
shape of the response curve as the radioactivity is transported
past the monitor. To determine this chape, puff releases of SF6
were performed in L Area which is being re-activated for
production. The SFg gas was used because it is easily detected,
noh-radioactive, non-toxic, and apparently causes no reaction
detrimental to reactor components. These tests also were
performed with the assistance of SRL Reactor tagineering during
other ventilation and flow distribution tests being performed
prior to L Area startup. The objective of the monitor response
teat. was to show a characteristic response that would allow
simulation by a simple algorithm that would apply for the likely
conditions prevailing during an incident.
All 8F6 releases were made manually by the discharge of SF6
loaded syringes being held immediately above the reactor tank in
the process room. Each discharge was performed at the same
location. 9O samples for the detector were drawn from a point
within the 200 foot discharge stack at an elevation of about 148
feet. Therefore, the SF6 gas was transported through the same
filter and confinement system through which any incident
radioactivity would pass. Two series of tests were performed.
The first series consisted of three discharges of 10 ml SPs
each. These tests proved to be inadequate car reliable analyses
since the response from the SF6 monitor was only about 15 to 18
of full scale on the most sensitive usable scale. However, these
teats were included in the analyses Nith the exception of the
first test in the series in which the syringe was not adequately
putged before filling). The second series consisted of four tests
using 45 ml of 81g. Two of these tests trae performed with two
ventilation fans running, the final two with only one fan
In the event of a brief release of radioactivity the stack
activity monitor indication would be expected to rise rapidly to a
peak value and then deareame approximately exponentially. The
mathematical model that was employed was based on the chi-squared
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Cooper, R. E. Reactor Room Experimental SF6 Tests to Determine Probable Stack Activity Response to Radioactive Releases, report, August 19, 2002; South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc742836/m1/4/: accessed April 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.