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

FUN 2 EO: 1.4-j

1 / 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

The reactor is fully depressurized

Reactor reaches its maximum pressure level

2 / 15

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

Provide core cooling under loss of coolant accident conditions

Control the reactor temperature during normal operations

Ensure a backup power supply to the reactor

Monitor radiation levels inside the reactor

3 / 15

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

Maintain radiation levels inside the core

Provide a backup power source during outages

Operate while the nuclear system is at high pressure

Cool the core during normal operations

4 / 15

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

High pressures

Variable pressures

Medium pressures

Low pressures

5 / 15

The automatic depressurization system (ADS) operates to:

Provide reactor depressurization for certain loss of coolant accidents

Manually regulate the temperature inside the reactor

Maintain regular reactor pressures during operations

Prevent over-cooling of the reactor core

6 / 15

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

3200 F

2200 F

1000 F

1800 F

7 / 15

Automatic depressurization is needed when:

The nuclear process barrier is functioning perfectly

The emergency systems fail to start during testing

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

The reactor needs a routine pressure release

8 / 15

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

One

Three

Two

Four

9 / 15

The residual heat removal system primarily takes water from:

The suppression pool

Automatic relief systems

Internal coolant chambers

External water sources

10 / 15

The low pressure emergency core cooling systems consist of:

Two independent HPCI systems

Dual nuclear process barriers

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

ADS and HPCI systems

11 / 15

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

Low pressure coolant injection (LPCI) mode

High pressure coolant injection (HPCI) system

Automatic depressurization system (ADS)

Core spray system

12 / 15

The core spray system functions by:

Spraying water on top of the fuel assemblies

Injecting coolants at the base of the reactor

Monitoring radiation levels continuously

Regulating the reactor's internal pressure

13 / 15

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

High pressure ECCS have started functioning

Core temperature has reached a certain threshold

Reactor pressure has decreased below approximately 100 psig

Reactor pressure has increased above 200 psig

14 / 15

The dominant mode of the residual heat removal system is:

Core spray system mode

Automatic depressurization mode

High pressure coolant injection mode

Low pressure coolant injection mode

15 / 15

The core spray system consists of:

Two separate and independent pumping loops

Three backup coolant injection systems

Four relief valves for pressure release

One central pumping mechanism

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