Gravex Macroporous Nuclear Grade Resins0 pages

Power Generation Systems — The Right Resin Choice
GRAVEX Macroporous Nuclear Grade Resins
®
GR-1-5 NG, GR-2-17 NG, GR-3-17 NG, GR-7-17 NG, GR-4-17 NG
These Gravex Nuclear Grade Ion exchange
mixed bed in a 2 cation:1 anion volume ratio. Gravex
resins are polystyrene, macroporous type resins. They
mixed beds are the most uniformly blended products
have been regenerated and processed to provide the highest
available and have the same consistent cation to anion
possible performance in nuclear applications. GR-1-5 NG
ratio in every package. A stoichiometric mixed bed
and GR-2-17 NG are fully tested and certified. Our unique
version with 7Li+ form cation is GR-4-17 NG.
blending process creates the less separable GR-3-17 NG
TYPICAL PROPERTIES
Product
GR-1-5 NG
GR-2-17 NG;
GR-7-17 NG
(7Li form)
GR-3-17 NG
GR-4-17 NG
Type
SBA Type 1
SAC
SAC/SBA
SAC/SBA
Matrix
Styrene-DVB Macro
Styrene-DVB Macro
Styrene-DVB Macro
Styrene-DVB Macro
Functional Group
Quaternary Ammonium
Sulfonic Acid
Ionic Form
OH-
H
Sulfonic Acid /
Quaternary Ammonium
+
H / OH-
Sulfonic Acid /
Quaternary Ammonium
7 +
Li / OH-
Total Exchange Capacity (meq/mL)
0.9 (min)
2.1 (min)
2.1 / 0.9
2.1 / 0.9
Ionic Conversion
97% OH (min)
99% H / Li (min)
99% / 97% (min)
99% / 97% (min)
3% CO3 (max)
3% CO3 (max)
3% CO3 (max)
0.1% Cl (max)
0.1% Cl (max)
0.1% Cl (max)
0.1% SO4 (max)
0.1% SO4 (max)
0.1% SO4 (max)
+
7
+
Water Retention
58–68%
43–49%
43–49% / 58–68%
43–49% / 58–68%
Whole Bead
95% (min)
95% (min)
95% (min)
95% (min)
average g/bead
350 (min)
350 (min)
350 (min)
350 (min)
> 200 g/bead
95% (min)
95% (min)
95% (min)
95% (min)
> 1,190 µm
2% (max)
2% (max)
2% (max)
2% (max)
< 300 µm
0.2% (max)
0.2% (max)
0.2% (max)
0.2% (max)
670 ± 120 µm
600 ± 75 µm
600/670 ± 75/120 µm
600/670 ± 75/120 µm
Friability
Particle Size
Harmonic Mean Size
Applications — Reactor Coolant Treatment
Similarly the GR-4-17 NG replaces the GR-4-9 NG during
(CVCS, chemical and volume control system)
full power operation. Each product continues to perform
This series of macroporous Gravex resins is designed to
the normal functions of reactor water treatment and pH
remove fine particulate radionuclides including isotopes
control. The GR-7-17 NG, 7Li form cation component may
of Co, Ni, Fe, & Ag. The cation GR-2-17 NG by itself and
be used to extend the bed life.
as a component of the mixed beds, is also selective for the
soluble species of the radionuclide metals. These Gravex
products are used for cleanup after outages to help maintain
plant restart schedules. The anion and cation products may
Radwaste Treatment — The GR-1-5 NG, GR-2-17 NG,
and GR-3-17 NG products are also useful for removing
soluble and fine particulate radionulides from liquid radwaste.
be layered over either of the mixed beds. The GR-3-17 NG
Spent Fuel Pools — GR-3-17 NG is chemically and
may be used in place of the GR-3-9 NG during full power
physically resistant to the aggressive environment in spent
operation to provide ongoing removal of fine particulates.
fuel pools.