Fluke 875 manual Cable Sealing, Specifications for Cable

Victoreen 875

Operators Manual

NOTE

Under potential L.O.C.A. conditions of pressure and temperature, the cable may expand as much as 11 inches per 100 feet.

The distance from the pull box to the detector will be determined by the amount of flex hose used to seal the detector cables. Additional information is found in the paragraph below Cable Sealing and in CABLE- 877 and 878-12-3 procedures in Appendix B.

Once the cables have been pulled and tested, the pull box cover must be bolted shut. To bolt the pull box shut, follow the steps outlined in procedure 878-12-3 in Appendix B. Pull box material type and grade is 304 stainless steel.

Cable Sealing

In-containment cable is 878-1-9. This is special cable designed to withstand the potential high radiation that may exist following a L.O.C.A. or similar event. In order to withstand the high pressure and moisture generated during such an event, the entire cable length must be sealed so that moisture will not come in contact with the cable. Cable specifications are listed below.

Specifications for Cable 878-1-9

Conductor	#24 AWG, 19/36 Tinned Copper
Insulation	Tefzel (BIWF)
Shield	#36 AWG, Tinned copper brand, 90% Coverage
Jacket	Tefzel (BIWF)
Outside Diameter	0.250 to 0.295 in
	(6.35 to 7.49 mm)
Impedance	75 ohms nominal
Capacitance	22 pf/ft nominal
Dielectric Strength	7000 V minimum
Operating Voltage	2300 V maximum

The following guidelines are based on the sealing method used during the qualification test. Stainless steel Flex Hose 878-12-30, ¾ inch diameter x 18.5 inches long (with welded Swagelok connectors) should be installed between the detector and pull box. Stainless steel tubing (¾ inch diameter) should be installed from the pull box to the penetration for each cable. If a common stainless steel tubing run is used, a one (1) inch diameter tube is recommended.

NOTE

Seismic support and the sealing technique at penetration vary with plant requirements. Techniques and materials used are the customer's responsibility.

Attach the stainless steel tubing to the pull box with compression fittings (¾ inch) and, after finger tightening, tighten at least 1-¼ turns. The flex hose connection at the pull box is installed in the same manner. The detector end of the flex hose is swaged to the cable connector backshell. This should not be

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