ENERGY-RELEASE AND THERMAL-MONITORING STUBS

The energy-release (EV) and thermal-monitoring (TK) stubs are designed to be used in in-core monitoring systems.

Function of the stubs – transmission of electric signals to a connection node:

• the EV stubs – from connectors of assemblies of in-core detectors (SVRD) to an electrical connection node on a concrete vault;
• the TK stubs – from connectors of compensating devices of UK-82, UT-0186 type, a connecting box for thermal monitoring of cases of control and protection system rod drives or their analogues.

Composition of the stubs:

• high-temperature insertion in EV stubs;
• a heat and moisture protected cable enclosed into a stainless braid;
• a connector for connection to SVRD or compensating devices;
• a device to seal the connector after it has been connected to SVRD;
• elements for protection against mechanical damages;
• a set of installation parts.

Key characteristics:

• high resistance to temperature and radiation;
• moisture protection, can operate under air-steam mixture conditions;
• survival in emergency and post-emergency conditions, including at a loss-of-coolant accident (LOCA);
• survival at local overheating to a level of primary coolant temperature.

Implementation facilities:

• Zaporizhzhya NPP
• Khmelnitsky NPP