FUN 2 EO: 1.4-j - Radiation Protection Tech.

FUN 2 EO: 1.4-j

1 / 15

The low pressure emergency core cooling systems consist of:

ADS and HPCI systems

Core spray system and LPCI mode of the residual heat removal system

Dual nuclear process barriers

Two independent HPCI systems

2 / 15

The emergency core cooling systems (ECCS) are designed to:

Control the reactor temperature during normal operations

Provide core cooling under loss of coolant accident conditions

Ensure a backup power supply to the reactor

Monitor radiation levels inside the reactor

3 / 15

The core spray system and low pressure coolant injection mode operate at:

Medium pressures

Variable pressures

High pressures

Low pressures

4 / 15

The core spray system consists of:

Four relief valves for pressure release

One central pumping mechanism

Three backup coolant injection systems

Two separate and independent pumping loops

5 / 15

The high pressure coolant injection system can supply make up water to the reactor vessel until:

Reactor pressure has decreased below approximately 100 psig

The low pressure emergency systems are activated

Reactor reaches its maximum pressure level

The reactor is fully depressurized

6 / 15

During a loss of coolant accident, the low pressure coolant injection mode's goal is to preclude fuel cladding temperatures from exceeding:

2200 F

3200 F

1000 F

1800 F

7 / 15

The automatic depressurization system (ADS) operates to:

Manually regulate the temperature inside the reactor

Provide reactor depressurization for certain loss of coolant accidents

Maintain regular reactor pressures during operations

Prevent over-cooling of the reactor core

8 / 15

The emergency core cooling systems consist of how many high pressure systems?

Two

Three

Four

One

9 / 15

What is the purpose of the high pressure coolant injection system?

Cool the core during normal operations

Maintain radiation levels inside the core

Operate while the nuclear system is at high pressure

Provide a backup power source during outages

10 / 15

The core spray system functions by:

Spraying water on top of the fuel assemblies

Monitoring radiation levels continuously

Regulating the reactor's internal pressure

Injecting coolants at the base of the reactor

11 / 15

The dominant mode of the residual heat removal system is:

Core spray system mode

High pressure coolant injection mode

Low pressure coolant injection mode

Automatic depressurization mode

12 / 15

The residual heat removal system primarily takes water from:

The suppression pool

Automatic relief systems

External water sources

Internal coolant chambers

13 / 15

Which system requires no auxiliary ac power, plant air systems, or external cooling water systems to function?

High pressure coolant injection (HPCI) system

Core spray system

Automatic depressurization system (ADS)

Low pressure coolant injection (LPCI) mode

14 / 15

Automatic depressurization is needed when:

The high pressure coolant injection system is inoperable and a break has occurred

The emergency systems fail to start during testing

The nuclear process barrier is functioning perfectly

The reactor needs a routine pressure release

15 / 15

For core cooling protection, flow from the low pressure ECCS is not required until:

Reactor pressure has decreased below approximately 100 psig

Core temperature has reached a certain threshold

High pressure ECCS have started functioning

Reactor pressure has increased above 200 psig

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