Pasia Industries Ltd
PASIA INDUSTRIES LTD ————Leading MI Cable Heating
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Stainless Steel Sheathed Signal Transmission MI Cable for Nuclear Reactor is generally used for the signal transmitting from the nuclear reactor in nuclear power plant. The cable possesses good performance on ability to withstand high temperature (600°C), nuclear radiation, and mechanical loads. This specification covers the general requirements for the design, construction, testing and delivery of the mineral insulated, SS sheathed copper cables.
| Description | Item 1 | Item 2 | Item 3 | Item 4 | |
| Dia(OD) | 0.5mm+2% | 0.5mm+2% | 0.75mm+1.33% | 0.75mm+1.33% | |
| Sheath | 316L SS | 316L SS | SS 316L | 316L SS | |
| Wire material | Copper | Nichrome | Copper | Nichrome | |
| Wire size (ф) | 0.20mm+2% | 0.20mm+2% | 0.30mm+1.33% | 0.30mm+1.33% | |
| Insulation | MgO >98% | MgO >98% | MgO >98% | MgO >98% | |
| Line Resistance | <0.6 Ω/m | <35 Ω/m | < 0.3 Ω/m | < 16Ω/m | |
| IR at 600℃ | >5MΩ | >5MΩ | >5MΩ | >5MΩ | |
| Requirement | 100mX5Nos. | 100mX5Nos. | 100mX5Nos. | 100mX5Nos. | |
| Total length | 500 m+ 2% | 500 m+ 2% | 500 m+ 2% | 500 m+ 2% | |
——Mineral insulated coaxial cable: composed of conductor, mineral powder insulation and metal sheath from inside to outside;
——Mineral insulated double shielded cable: it is composed of conductor, inner insulating layer of mineral powder, inner shielding layer, outer insulating layer of mineral powder and metal sheath from inside to outside;
——Mineral insulated triaxial cable: it is composed of conductor, mineral powder inner insulation layer, inner shielding layer, mineral powder outer insulation layer, outer shielding layer and metal sheath from inside to outside.
The components are as follows:
——Conductor: copper, nickel chromium alloy or pure nickel
——Internal / external insulation: high purity magnesia powder (MgO), alumina powder (Al2O3) or silica powder (SiO2);
——Internal / external shielding: copper, 304L, 321, 316L, Inconel 600 or 825 alloy;
——Sheath: 304L, 321, 316L, Inconel 600 or 825 alloy.
Features
■ Optimised geometries to minimise surface transfer impedance
■ Designed to maintain screening performance of measurement chain
■ Very high insulation resistance to minimise signal losses
■ All cable supplied fully tested
■ Maximum operating temperature of 700 ºC in high neutron flux fields
■ Dimensions and lengths can be adapted to particular applications
| Parameters | Technical data | |||
| Coaxial | Double shield | Triax | ||
| Conductor | Cores | 1 | ||
| OD,mm | 0.20 - 3.18 | |||
| Insulation thickness | Inner,mm | 0.35 - 6.1 | ||
| Outer,mm | - | 0.40 - 1.0 | ||
| Cable OD,mm | 4.0 - 19.1 | 3.0 - 19.1 | ||
| Sheath thickness,mm | 0.25 - 1.60 | 0.30 - 1.90 | ||
| Characteristic impedance,Ω | 50±5 | |||
Insulation thickness
| Core – inner shielding | ≥ 10000 MΩ | ||
| Inner shielding – outer shielding | - | ≥ 10000 MΩ | ||
| γ radiation dose,Gy/h | ≥ 2 × 106 | |||
| Maximum withstand temperature | ≥ 900℃ / 2min | |||
Structure materials (optional) | Conductor | Copper, nickel chromium or pure nickel | ||
| Inner insulation | High-pure MgO,Al2O3,SiO2 | |||
| Inner shielding | - | Copper,,304L,321,316L | ||
| Outer insulation | - | High-pure MgO,Al2O3,SiO2 | ||
| Outer shielding | - | - | Copper, | |
| Sheath | 304L,321,316L,Inconel 600,Alloy 825 | |||