Castable Reactor Shielding

JC277 & JC277-5


JC277 & JC277-5 are excellent high flux neutron shields for power reactor and other industrial neutron shielding applications.

Power reactor and other industrial neutron shielding applications often require a material that exhibits a high-temperature resistance. JC277 & JC277-5 are excellent high flux neutron shields for power reactor and other industrial neutron shielding applications due to the inclusion of temperature resistant additives that provide hydrogen for moderation and boron for thermal neutron absorption.

JC277 is a refractory material that retains its shielding properties at temperatures up to 230°C (450°F) and its physical integrity up to 1038°C (1900°F). It is entirely non-combustible and is designed to be cast in the field.

It provides more than twice the hydrogen of ordinary concrete (equal to approximately 1/2 that of pure water) along with a boron content of 1.6% and 5% respectively. JC277 is provided as a dry mix for casting in the field, it can be shaped using standard concrete cutting/drilling tools and is typically provided in 300-lb fibre barrels.

Approximately 96-lbs. of dry mix are required to obtain one-cubic ft. of the cast material. (1.54 kg of dry mix will give one litre). Detailed mixing instructions are provided with each order. Recommended shelf-life under dry storage conditions is twelve months.

Composition Data JC277 JC277-5
Hydrogen atom density / cm³: 4.93 x 10²² 4.76 x 10²²
Hydrogen Weight %: 4.90% 4.73%
Boron atom density / cm³: 1.53 x 10²¹ 4.67 x 10²¹
Boron Natural isotope distribution: 19.6% ¹⁰B and 80.4 % ¹¹B 19.6% ¹⁰B and 80.4 % ¹¹B
Boron weight percent: 1.63% 4.99%
Total Density: 1.68 g/cm³ (105 lbs./ft³) 1.68 g/cm³ (105 lbs./ft³)
Radiation Properties
Macroscopic thermal neutron cross section: 1.17 (cm⁻¹) 3.54 (cm⁻¹)
Gamma resistance: 1 x 10¹¹ rad 1 x 10¹¹ rad
Neutron resistance: 5 x 10¹⁹ n/cm² 5 x 10¹⁹ n/cm²
Physical Properties
State: Solid composite Solid composite
Color: Light gray Light gray
Odor: No odour No odour
Machinability: Fair: saw cut or drilled Fair: saw cut or drilled
Tensile Strength (ASTM D368): 100 psi 100 psi
Compressive Strength: 1000 psi 1000 psi
Thermal Properties
Recommended Temperature Limit: 176°C (350°F) 176°C (350°F)
Coefficient of thermal conductivity: 1.24 x 10⁻³ cal-cm/sec-cm²-°C 1.24 x 10⁻³ cal-cm/sec-cm²-°C
(0.3 BTU-ft/hr-ft²-°F) (0.3 BTU-ft/hr-ft²-°F)
Heat Capacity: 0.22 cal/g-°C 0.22 cal/g-°C
Cubical Coefficient of Expansion: 8 x 10⁻⁶ cm³/cm³-°C 8 x 10⁻⁶ cm³/cm³-°C
(1.4 x 10⁻⁵ in³ /in³ -°F) (1.4 x 10⁻⁵ in³ /in³ -°F)
Chemical Properties
Chemical Name & Synonyms: Borated hydrogenated mix Borated hydrogenated mix
Trade Name & Synonyms: JC277 JC277-5
Chemical Family: Calcium salts, boron, hydrogen compounds Calcium salts, boron, hydrogen compounds
Solubility in Water: Negligible Negligible
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