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

FUN 2 EO: 1.4-j

1 / 15

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

Core spray system

Low pressure coolant injection (LPCI) mode

High pressure coolant injection (HPCI) system

Automatic depressurization system (ADS)

2 / 15

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

The low pressure emergency systems are activated

Reactor pressure has decreased below approximately 100 psig

Reactor reaches its maximum pressure level

The reactor is fully depressurized

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

Two

One

Four

Three

5 / 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

6 / 15

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

High pressures

Variable pressures

Low pressures

Medium pressures

7 / 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

8 / 15

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

Monitor radiation levels inside the reactor

Provide core cooling under loss of coolant accident conditions

Control the reactor temperature during normal operations

Ensure a backup power supply to the reactor

9 / 15

The dominant mode of the residual heat removal system is:

Core spray system mode

Low pressure coolant injection mode

High pressure coolant injection mode

Automatic depressurization mode

10 / 15

The core spray system consists of:

Three backup coolant injection systems

Four relief valves for pressure release

Two separate and independent pumping loops

One central pumping mechanism

11 / 15

The automatic depressurization system (ADS) operates to:

Provide reactor depressurization for certain loss of coolant accidents

Prevent over-cooling of the reactor core

Manually regulate the temperature inside the reactor

Maintain regular reactor pressures during operations

12 / 15

Automatic depressurization is needed when:

The emergency systems fail to start during testing

The reactor needs a routine pressure release

The nuclear process barrier is functioning perfectly

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

13 / 15

The low pressure emergency core cooling systems consist of:

Dual nuclear process barriers

ADS and HPCI systems

Two independent HPCI systems

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

14 / 15

The residual heat removal system primarily takes water from:

Internal coolant chambers

External water sources

The suppression pool

Automatic relief systems

15 / 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

1800 F

2200 F

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