What is an emergency power supply system (EPSS)?
, Pressurized Heavy Water Reactors Nadine El Dabaghi, Jasmina Vucetic The emergency power supply system (EPSS) is an independent power system, consisting of its own on-site power generation and distribution systems (whose normal power supply comes from Class III). This system belongs to Group II.
What is an emergency power system?
Typically, an emergency power system comprises various power devices and associated control, switching, and monitoring equipment. Common emergency power devices include diesel generators, which have robust power generation capabilities and can independently supply power to critical loads when the main power supply is unavailable.
What is an emergency AC power system?
The purpose of the Emergency AC Power (EP) system is to provide a reliable source of AC power to the loads required for safe shutdown and cooldown of the plant. The preferred sources of power to the EP system are the Normal Station Supply Transformer (NSST) and the Reserve Station Supply Transformer (RSST).
What are the different types of emergency power systems?
Common emergency power devices include diesel generators, which have robust power generation capabilities and can independently supply power to critical loads when the main power supply is unavailable. Below is an overview of the types of emergency power systems and key design considerations.
How do emergency buses supply power?
The emergency buses supply normal and emergency power to many plant systems. Table 9.2-1 lists the major 4160v loads supplied by the system. The NP system energizes the emergency buses during normal operation and is the preferred source of power. Power is normally supplied through the NSST but can be supplied from the RSST.
What are emergency power options?
Among emergency power options, generators independent of the normal power supply play a vital role. Emergency gas turbine generators, known for their efficiency and quick response, are highly regarded, while emergency diesel generators are commonly chosen for their reliability and broad applicability.
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