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

FUN 2 EO: 1.4-j

1 / 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

2 / 15

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

Automatic depressurization system (ADS)

High pressure coolant injection (HPCI) system

Core spray system

Low pressure coolant injection (LPCI) mode

3 / 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

The reactor is fully depressurized

Reactor reaches its maximum pressure level

4 / 15

The core spray system consists of:

Two separate and independent pumping loops

One central pumping mechanism

Four relief valves for pressure release

Three backup coolant injection systems

5 / 15

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

Provide a backup power source during outages

Operate while the nuclear system is at high pressure

Maintain radiation levels inside the core

Cool the core during normal operations

6 / 15

The automatic depressurization system (ADS) operates to:

Prevent over-cooling of the reactor core

Maintain regular reactor pressures during operations

Provide reactor depressurization for certain loss of coolant accidents

Manually regulate the temperature inside the reactor

7 / 15

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

Variable pressures

High pressures

Medium pressures

Low pressures

8 / 15

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

Ensure a backup power supply to the reactor

Provide core cooling under loss of coolant accident conditions

Monitor radiation levels inside the reactor

Control the reactor temperature during normal operations

9 / 15

The residual heat removal system primarily takes water from:

Automatic relief systems

Internal coolant chambers

External water sources

The suppression pool

10 / 15

The core spray system functions by:

Injecting coolants at the base of the reactor

Monitoring radiation levels continuously

Regulating the reactor's internal pressure

Spraying water on top of the fuel assemblies

11 / 15

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

Three

One

Four

Two

12 / 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

1800 F

1000 F

13 / 15

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

High pressure ECCS have started functioning

Reactor pressure has decreased below approximately 100 psig

Core temperature has reached a certain threshold

Reactor pressure has increased above 200 psig

14 / 15

The dominant mode of the residual heat removal system is:

High pressure coolant injection mode

Core spray system mode

Automatic depressurization mode

Low pressure coolant injection mode

15 / 15

The low pressure emergency core cooling systems consist of:

Two independent HPCI systems

Dual nuclear process barriers

ADS and HPCI systems

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

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