1E Class Cable for Nuclear Power Station

Http://www.anhuitiankang.com.cn      Nov 04, 2010

It is used for return circuit of class 1E category K3 outside security housing of nuclear reactor in nuclear power station.

Executive Standard:
As the enterprise’s enterprise ( with reference to “Design & Manufacturing Regulation on Electric Devices of Nuclear Island of RCC-E Reactor in Nuclear Power Station” of France & “ technical Specification of 0.6/1kV Control Cable” by No.2 Research & Design Institute of Nuclear Industry)

Main Features:

  1. The cable, which is located outside security housing of nuclear reactor, keeps itself in normal operation under normal circumstance and earthquake loading. It belongs to category K3 by quality appraisal procedure.
  2. It has flame-retardant performance free from halogen with low smoke and low spreading speed, smoke density and poisonous gas emission in fire disaster, which results in low corrosion on instruments and devices. It could meet special environmental demands of nuclear power station.
  3. Cables for nuclear power station include 5 categories: power cable of rated voltage 6/10kV or lower, control cable, instrument cable, compensational cable, and optic fiber cable.

Main Technical Parameters:

  1. D.C. Conductor Resistance(20℃)
    1. PLS make reference to that of common power cable with plastic insulation for D.C. conductor resistance of power cable of rated voltage 6/10kV or lower for nuclear power station.
    2. D.C. Conductor Resistance of Control Cable

Nominal cross section areas (mm2)

Pieces/ Diameter of Single Piec

D.C. Conductor Resistance (20℃)≤W/km

Category 1

Category 2

Non-plated

Plated

1.0

1/1.13

7/0.43

18.1

18.2

1.5

1/1.38

7/0.52

12.1

12.2

2.5

1/1.78

7/0.68

7.41

7.56

    1. D.C. Conductor Resistance of Instrument Cable

Conductor Diameter (mm)

D.C. Conductor Resistance(20℃) ≤W/km

Non-plated

plated

0.8

36.0

36.7

1.0

23.5

23.8

    1. Conductor Structure of Compensational Cable

Nominal cross section area(mm2)

D.C. Conductor Resistance (20℃) ≤W/km

Single Strand

Multi strand

1.0

1/1.13

7/0.43

1.5

1/1.37

7/0.52

2.5

1/1.76

19/0.41

  1. Insulation Resistance Constant(Ki)
  2. Voltage Test of Finished Cable under Working Frequency:

(1). Power Cable, Control Cable: 3.5kV/5min
(2) Instrument Cable, Compensational Cable: between insulated cores:2.5kV/5min between insulated core and shielding: 1.5kV/5min
4. Long-term Thermal Cycle Test:
(1). Test Time 5000h
(2). Test Voltage 2kV
5. Flame-retardant Performance:
5.1 Vertical Firing Test of Single Insulated Core Flame Supply Time: 15 S   Flame-free Time: 15 S The damaged area should be less than 25% after 5 mins of repetition
5.2 Cable Firing Test in Bundle (Category B): damaged Cable   length≤2.5m
5.3 Smoke Density Test (Light Penetration Rate):
5.4 The emitted gas corrosion in firing of sheath material: PH value≥4.3; Electric Conductivity≤10ms/mm

Working conditions:

    • The highest rated temperature of cable conductor is 90℃. It should be no higher than 250℃ in time of short circuit.(It lasts no longer than 5 minutes.)
    • Ambient temperature in installation should be no lower than 0℃
    • Allowed bending radius in installation should be no less than 8 times that of cable outer diameter for cable without armor, and 16 times for armored cable. And it should be bigger for power cable.
    • Ray radiation volume accumulated under normal operation status of reactor is 250KGY; Ray radiation volume accumulated under LOCA status is 600KGY
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