IGCAR : Annual Report - Indira Gandhi Centre for Atomic Research
IGCAR : Annual Report - Indira Gandhi Centre for Atomic Research
IGCAR : Annual Report - Indira Gandhi Centre for Atomic Research
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IGC<br />
<strong>Annual</strong> <strong>Report</strong> 2007<br />
treatment. The lean solvent<br />
could be reused in the plant.<br />
The operational experience is<br />
being analysed to evolve a<br />
viable flowsheet <strong>for</strong> DFRP.<br />
As the gamma back ground is<br />
very high in the CORAL facility,<br />
it was not possible to monitor<br />
Pu in the hulls by gamma<br />
assaying. A separate facility is<br />
being constructed to<br />
accomplish this measurement<br />
using HPG or Lithium Bromide<br />
detector can be used.<br />
Some of the centrifugal<br />
extractor motors required<br />
replacement. HEPA filters in the<br />
vessel off gas system and glove<br />
box off gas system were<br />
changed since the pressure<br />
drop across the filters were<br />
more than 75mm. These filters<br />
did not have any significant α<br />
contamination which is<br />
indicative of the effective first<br />
stage filtration in the respective<br />
circuits.<br />
The facility is gearing up <strong>for</strong><br />
taking the next important<br />
milestone of reprocessing 155<br />
GWd/t burnup FBTR fuel. After<br />
review of the operation of this<br />
facility during the earlier<br />
campaigns, AERB has cleared<br />
the proposal <strong>for</strong> taking up this<br />
campaign.<br />
IV.B.2. Thermodynamic Measurements on Aqueous<br />
Solutions of Uranyl Nitrate Hexahydrate at<br />
298.15 K and 0.1 MPa<br />
Uranyl nitrate hexahydrate<br />
(UNH) is an important key<br />
solute in the nuclear solvent<br />
extraction processes like<br />
PUREX, UREX and UREX+.<br />
In<strong>for</strong>mation on the<br />
thermodynamic parameters <strong>for</strong><br />
aqueous solutions of uranyl<br />
nitrate is severely limited.<br />
Recently at Reprocessing<br />
Fig.1 Experimental determination<br />
of water activity of aqueous uranyl<br />
nitrate hexahydrate solutions at<br />
298.15 K and 0.1 MPa. The present<br />
experimental and calculated data<br />
are compared with those reported<br />
in the literature.<br />
Group, thermodynamic<br />
parameters of UNH in aqueous<br />
solutions viz. activity<br />
coefficients, osmotic<br />
coefficients, excess Gibbs<br />
energy and vapour pressures<br />
were measured. Selected results<br />
of these investigations are<br />
highlighted here.<br />
ASTM Grade-1 water as per<br />
ASTM D-1193-99 with a<br />
resistivity of 18.2 M Ωcm at<br />
298.15 K and TOC
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