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

FUN 2 EO: 1.4-j

1 / 15

The residual heat removal system primarily takes water from:

Internal coolant chambers

The suppression pool

External water sources

Automatic relief systems

2 / 15

The dominant mode of the residual heat removal system is:

Automatic depressurization mode

Low pressure coolant injection mode

Core spray system mode

High pressure coolant injection mode

3 / 15

The low pressure emergency core cooling systems consist of:

ADS and HPCI systems

Dual nuclear process barriers

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

Two independent HPCI systems

4 / 15

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

Low pressures

Medium pressures

High pressures

Variable pressures

5 / 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

2200 F

3200 F

1000 F

6 / 15

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

Cool the core during normal operations

Maintain radiation levels inside the core

Provide a backup power source during outages

Operate while the nuclear system is at high pressure

7 / 15

The core spray system functions by:

Regulating the reactor's internal pressure

Monitoring radiation levels continuously

Spraying water on top of the fuel assemblies

Injecting coolants at the base of the reactor

8 / 15

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

The low pressure emergency systems are activated

The reactor is fully depressurized

Reactor reaches its maximum pressure level

Reactor pressure has decreased below approximately 100 psig

9 / 15

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

Reactor pressure has decreased below approximately 100 psig

Reactor pressure has increased above 200 psig

Core temperature has reached a certain threshold

High pressure ECCS have started functioning

10 / 15

The automatic depressurization system (ADS) operates to:

Maintain regular reactor pressures during operations

Provide reactor depressurization for certain loss of coolant accidents

Manually regulate the temperature inside the reactor

Prevent over-cooling of the reactor core

11 / 15

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

Control the reactor temperature during normal operations

Ensure a backup power supply to the reactor

Provide core cooling under loss of coolant accident conditions

Monitor radiation levels inside the reactor

12 / 15

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

Four

Three

One

Two

13 / 15

The core spray system consists of:

Four relief valves for pressure release

Three backup coolant injection systems

Two separate and independent pumping loops

One central pumping mechanism

14 / 15

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

Automatic depressurization system (ADS)

Low pressure coolant injection (LPCI) mode

High pressure coolant injection (HPCI) system

Core spray system

15 / 15

Automatic depressurization is needed when:

The reactor needs a routine pressure release

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

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