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

FUN 2 EO: 1.4-j

1 / 15

The core spray system consists of:

Four relief valves for pressure release

One central pumping mechanism

Two separate and independent pumping loops

Three backup coolant injection systems

2 / 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

3 / 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

4 / 15

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

Reactor pressure has decreased below approximately 100 psig

The reactor is fully depressurized

The low pressure emergency systems are activated

Reactor reaches its maximum pressure level

5 / 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

6 / 15

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

Operate while the nuclear system is at high pressure

Cool the core during normal operations

Provide a backup power source during outages

Maintain radiation levels inside the core

7 / 15

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

Four

Three

Two

One

8 / 15

The residual heat removal system primarily takes water from:

Internal coolant chambers

Automatic relief systems

External water sources

The suppression pool

9 / 15

The automatic depressurization system (ADS) operates to:

Prevent over-cooling of the reactor core

Provide reactor depressurization for certain loss of coolant accidents

Maintain regular reactor pressures during operations

Manually regulate the temperature inside the reactor

10 / 15

Automatic depressurization is needed when:

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

The nuclear process barrier is functioning perfectly

The reactor needs a routine pressure release

The emergency systems fail to start during testing

11 / 15

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

Low pressures

High pressures

Medium pressures

Variable pressures

12 / 15

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

Reactor pressure has decreased below approximately 100 psig

Core temperature has reached a certain threshold

High pressure ECCS have started functioning

Reactor pressure has increased above 200 psig

13 / 15

The core spray system functions by:

Injecting coolants at the base of the reactor

Spraying water on top of the fuel assemblies

Regulating the reactor's internal pressure

Monitoring radiation levels continuously

14 / 15

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

Provide core cooling under loss of coolant accident conditions

Monitor radiation levels inside the reactor

Control the reactor temperature during normal operations

Ensure a backup power supply to the reactor

15 / 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

1000 F

3200 F

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