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

FUN 2 EO: 1.4-j

1 / 15

Automatic depressurization is needed when:

The reactor needs a routine pressure release

The emergency systems fail to start during testing

The nuclear process barrier is functioning perfectly

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

2 / 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

3 / 15

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

High pressures

Medium pressures

Low pressures

Variable pressures

4 / 15

The low pressure emergency core cooling systems consist of:

ADS and HPCI systems

Two independent HPCI systems

Dual nuclear process barriers

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

5 / 15

The residual heat removal system primarily takes water from:

The suppression pool

Automatic relief systems

External water sources

Internal coolant chambers

6 / 15

The dominant mode of the residual heat removal system is:

Low pressure coolant injection mode

Core spray system mode

High pressure coolant injection mode

Automatic depressurization mode

7 / 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

8 / 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

Ensure a backup power supply to the reactor

Monitor radiation levels inside the reactor

9 / 15

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

Core temperature has reached a certain threshold

High pressure ECCS have started functioning

Reactor pressure has increased above 200 psig

Reactor pressure has decreased below approximately 100 psig

10 / 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

11 / 15

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

Reactor reaches its maximum pressure level

The low pressure emergency systems are activated

Reactor pressure has decreased below approximately 100 psig

The reactor is fully depressurized

12 / 15

The core spray system consists of:

Four relief valves for pressure release

Three backup coolant injection systems

One central pumping mechanism

Two separate and independent pumping loops

13 / 15

The core spray system functions by:

Injecting coolants at the base of the reactor

Regulating the reactor's internal pressure

Spraying water on top of the fuel assemblies

Monitoring radiation levels continuously

14 / 15

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

Cool the core during normal operations

Provide a backup power source during outages

Maintain radiation levels inside the core

Operate while the nuclear system is at high pressure

15 / 15

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

One

Three

Four

Two

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