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

FUN 2 EO: 1.4-j

1 / 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

2 / 15

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

1800 F

3200 F

2200 F

1000 F

3 / 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 reactor needs a routine pressure release

The nuclear process barrier is functioning perfectly

4 / 15

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

Variable pressures

Medium pressures

High pressures

Low pressures

5 / 15

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

Operate while the nuclear system is at high pressure

Cool the core during normal operations

Provide a backup power source during outages

Maintain radiation levels inside the core

6 / 15

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

Low pressure coolant injection (LPCI) mode

Core spray system

High pressure coolant injection (HPCI) system

Automatic depressurization system (ADS)

7 / 15

The automatic depressurization system (ADS) operates to:

Prevent over-cooling of the reactor core

Provide reactor depressurization for certain loss of coolant accidents

Manually regulate the temperature inside the reactor

Maintain regular reactor pressures during operations

8 / 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

9 / 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

10 / 15

The core spray system consists of:

One central pumping mechanism

Three backup coolant injection systems

Four relief valves for pressure release

Two separate and independent pumping loops

11 / 15

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

High pressure ECCS have started functioning

Reactor pressure has increased above 200 psig

Core temperature has reached a certain threshold

Reactor pressure has decreased below approximately 100 psig

12 / 15

The residual heat removal system primarily takes water from:

Internal coolant chambers

Automatic relief systems

The suppression pool

External water sources

13 / 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 reactor is fully depressurized

The low pressure emergency systems are activated

Reactor reaches its maximum pressure level

14 / 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

Monitor radiation levels inside the reactor

Ensure a backup power supply to the reactor

15 / 15

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

One

Two

Four

Three

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