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

FUN 2 EO: 1.4-j

1 / 15

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

Ensure a backup power supply to the reactor

Control the reactor temperature during normal operations

Provide core cooling under loss of coolant accident conditions

Monitor radiation levels inside the reactor

2 / 15

The dominant mode of the residual heat removal system is:

Automatic depressurization mode

Low pressure coolant injection mode

High pressure coolant injection mode

Core spray system mode

3 / 15

The core spray system functions by:

Injecting coolants at the base of the reactor

Regulating the reactor's internal pressure

Monitoring radiation levels continuously

Spraying water on top of the fuel assemblies

4 / 15

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

High pressures

Medium pressures

Low pressures

Variable pressures

5 / 15

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

Core spray system

High pressure coolant injection (HPCI) system

Automatic depressurization system (ADS)

Low pressure coolant injection (LPCI) mode

6 / 15

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

The reactor is fully depressurized

The low pressure emergency systems are activated

Reactor reaches its maximum pressure level

Reactor pressure has decreased below approximately 100 psig

7 / 15

The core spray system consists of:

Three backup coolant injection systems

Four relief valves for pressure release

One central pumping mechanism

Two separate and independent pumping loops

8 / 15

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

Two

One

Four

Three

9 / 15

The residual heat removal system primarily takes water from:

The suppression pool

External water sources

Automatic relief systems

Internal coolant chambers

10 / 15

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

Operate while the nuclear system is at high pressure

Provide a backup power source during outages

Cool the core during normal operations

Maintain radiation levels inside the core

11 / 15

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

Reactor pressure has increased above 200 psig

Core temperature has reached a certain threshold

High pressure ECCS have started functioning

Reactor pressure has decreased below approximately 100 psig

12 / 15

Automatic depressurization is needed when:

The nuclear process barrier is functioning perfectly

The reactor needs a routine pressure release

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

The emergency systems fail to start during testing

13 / 15

The low pressure emergency core cooling systems consist of:

Dual nuclear process barriers

Two independent HPCI systems

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

ADS and HPCI systems

14 / 15

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

1000 F

3200 F

2200 F

1800 F

15 / 15

The automatic depressurization system (ADS) operates to:

Provide reactor depressurization for certain loss of coolant accidents

Prevent over-cooling of the reactor core

Maintain regular reactor pressures during operations

Manually regulate the temperature inside the reactor

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