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

FUN 2 EO: 1.4-j

1 / 15

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

Control the reactor temperature during normal operations

Monitor radiation levels inside the reactor

Provide core cooling under loss of coolant accident conditions

Ensure a backup power supply to the reactor

2 / 15

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

Reactor reaches its maximum pressure level

The reactor is fully depressurized

Reactor pressure has decreased below approximately 100 psig

The low pressure emergency systems are activated

3 / 15

The low pressure emergency core cooling systems consist of:

Dual nuclear process barriers

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

ADS and HPCI systems

Two independent HPCI systems

4 / 15

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

High pressure coolant injection (HPCI) system

Low pressure coolant injection (LPCI) mode

Automatic depressurization system (ADS)

Core spray system

5 / 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

6 / 15

The dominant mode of the residual heat removal system is:

High pressure coolant injection mode

Low pressure coolant injection mode

Automatic depressurization mode

Core spray system mode

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

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

1000 F

1800 F

3200 F

2200 F

9 / 15

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

Two

Four

Three

One

10 / 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 nuclear process barrier is functioning perfectly

The reactor needs a routine pressure release

11 / 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

12 / 15

The core spray system consists of:

Two separate and independent pumping loops

Four relief valves for pressure release

Three backup coolant injection systems

One central pumping mechanism

13 / 15

The residual heat removal system primarily takes water from:

Internal coolant chambers

Automatic relief systems

External water sources

The suppression pool

14 / 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

15 / 15

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

High pressures

Low pressures

Variable pressures

Medium pressures

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