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Questions and Answers
What is the primary purpose of the steel liner inside the containment building?
What is the primary purpose of the steel liner inside the containment building?
- To serve as a vapor proof membrane preventing gas escape (correct)
- To enhance the structural integrity of the concrete
- To absorb radiation and reduce health risks
- To provide a surface for cooling systems to operate on
Which system is primarily responsible for reducing temperature in the containment building after an accident?
Which system is primarily responsible for reducing temperature in the containment building after an accident?
- Fan cooler system (correct)
- Containment pressure relief system
- Containment spray system
- Pressure regulation system
What can happen if cracks develop in the concrete of the containment building during a high energy fluid release?
What can happen if cracks develop in the concrete of the containment building during a high energy fluid release?
- Temperature will automatically stabilize without further action
- Radioactive material may be forced out into the environment (correct)
- Water will absorb all the radioactive material
- Gas can escape, increasing the cooling requirements
What is one of the consequences of a break in the primary system within the containment building?
What is one of the consequences of a break in the primary system within the containment building?
How does the containment spray system contribute to containment safety?
How does the containment spray system contribute to containment safety?
What effect does prolonged exposure to high temperatures and pressures have on the concrete of the containment?
What effect does prolonged exposure to high temperatures and pressures have on the concrete of the containment?
What is the result of maintaining high pressure in the containment after an incident?
What is the result of maintaining high pressure in the containment after an incident?
In the event of a secondary break, what would the containment atmosphere primarily be filled with?
In the event of a secondary break, what would the containment atmosphere primarily be filled with?
What is the primary purpose of the safety valves in a pressurized water reactor system?
What is the primary purpose of the safety valves in a pressurized water reactor system?
Which component is primarily responsible for feeding liquid to the reactor coolant system (RCS) within a pressurizer setup?
Which component is primarily responsible for feeding liquid to the reactor coolant system (RCS) within a pressurizer setup?
What role does the cooling spray serve in a pressurized water reactor?
What role does the cooling spray serve in a pressurized water reactor?
How does the main steam isolation valve (MSIV) function within the context of reactor safety?
How does the main steam isolation valve (MSIV) function within the context of reactor safety?
What is the primary function of the relief tank associated with the pressurizer?
What is the primary function of the relief tank associated with the pressurizer?
What is the function of the moisture separator reheater (MSR) in a pressurized water reactor system?
What is the function of the moisture separator reheater (MSR) in a pressurized water reactor system?
Which component directly affects the heating process within the pressurizer?
Which component directly affects the heating process within the pressurizer?
What is the purpose of instrumentation nozzles in the reactor system?
What is the purpose of instrumentation nozzles in the reactor system?
In a cutaway view of a pressurizer, what does the lifting trunnion primarily provide?
In a cutaway view of a pressurizer, what does the lifting trunnion primarily provide?
What is the primary function of the containment spray system?
What is the primary function of the containment spray system?
Where does the containment spray pump draw water from during operation?
Where does the containment spray pump draw water from during operation?
What happens to steam when water droplets are sprayed into the containment atmosphere?
What happens to steam when water droplets are sprayed into the containment atmosphere?
What can the containment spray system utilize if the refueling water storage tank is depleted?
What can the containment spray system utilize if the refueling water storage tank is depleted?
Which of the following terms is synonymous with 'residual heat removal system' as per various vendor designs?
Which of the following terms is synonymous with 'residual heat removal system' as per various vendor designs?
What is a key difference among the designs of pressurized water reactors by different vendors?
What is a key difference among the designs of pressurized water reactors by different vendors?
The operation of the containment spray system is similar to which other system?
The operation of the containment spray system is similar to which other system?
Why is reducing the pressure of the containment important during operations?
Why is reducing the pressure of the containment important during operations?
What is the purpose of the Cold Leg Accumulators in the context of emergency core cooling systems?
What is the purpose of the Cold Leg Accumulators in the context of emergency core cooling systems?
Which component is responsible for the high-pressure injection in a Pressurized Water Reactor?
Which component is responsible for the high-pressure injection in a Pressurized Water Reactor?
In the event of a cooling system failure, which system utilizes water from the containment sump?
In the event of a cooling system failure, which system utilizes water from the containment sump?
Which system is responsible for removing excess heat from the reactor vessel after a shutdown?
Which system is responsible for removing excess heat from the reactor vessel after a shutdown?
What is the primary function of the Reactor Coolant System?
What is the primary function of the Reactor Coolant System?
Which of the following components is NOT located inside the containment building?
Which of the following components is NOT located inside the containment building?
What role do the Steam Generators play in a Pressurized Water Reactor system?
What role do the Steam Generators play in a Pressurized Water Reactor system?
What does the acronym RCP stand for in the context of reactor coolant systems?
What does the acronym RCP stand for in the context of reactor coolant systems?
During which circumstances would the Intermediate Pressure Cooling Injection System be activated?
During which circumstances would the Intermediate Pressure Cooling Injection System be activated?
Which of the following best describes the term 'accumulators' in the context of reactor safety systems?
Which of the following best describes the term 'accumulators' in the context of reactor safety systems?
What happens to the steam generation process as decay heat decreases?
What happens to the steam generation process as decay heat decreases?
Which system is primarily responsible for cooling in the event of reduced steam generation?
Which system is primarily responsible for cooling in the event of reduced steam generation?
What role does the Service Water System (SW) play in a Pressurized Water Reactor?
What role does the Service Water System (SW) play in a Pressurized Water Reactor?
During the cooldown process, which component directly interacts with the environment?
During the cooldown process, which component directly interacts with the environment?
What is the consequence of insufficient decay heat in relation to the steam generators?
What is the consequence of insufficient decay heat in relation to the steam generators?
Which component's function is primarily affected when decay heat diminishes?
Which component's function is primarily affected when decay heat diminishes?
What is a likely outcome when the reactor core temperature increases significantly after decay heat decreases?
What is a likely outcome when the reactor core temperature increases significantly after decay heat decreases?
Which system ultimately helps manage decay heat when steam generation cannot be sustained?
Which system ultimately helps manage decay heat when steam generation cannot be sustained?
Study Notes
Pressurized Water Reactor Systems Overview
- Pressurized Water Reactors (PWR) utilize a pressurizer to maintain the reactor coolant system (RCS) pressure.
- Key components include spray nozzles, relief and safety nozzles, instrumentation nozzles, heater supports, and surge nozzles.
Pressurizer and Associated Components
- Pressurizers control system pressure and assist with liquid expansion.
- Contain safety features such as safety valves and relief valves.
- Connected to cooling spray systems and relief tanks to manage pressure and temperature during incidents.
Emergency Core Cooling Systems
- Essential for reactor safety; these systems activate during unexpected cooling events.
- Utilize various injection systems to ensure continuous cooling of the reactor core.
- Components like High Pressure Injection System and Low Pressure Injection System serve critical roles in maintaining system integrity.
Containment Features
- Containment structures are designed to withstand high pressure and temperature from potential coolant leaks.
- A steel liner acts as a vapor barrier, preventing radioactive material release during accidents.
- Containment spray systems operate to cool and depressurize the containment atmosphere by spraying cooler water to condense steam.
Cooling and Heat Removal Systems
- The Residual Heat Removal (RHR) system is crucial for removing decay heat after reactor shutdown.
- Additional components like the Chemical and Volume Control System (CVCS) manage coolant makeup and purification.
Differences Among Vendor Designs
- While key safety systems are standard, terminology and design specifics may vary across reactor vendors.
- Emergency core cooling systems are universally required, although implementation details differ.
Containment Response Mechanism
- In the event of a containment air atmosphere filled with steam due to a break, the containment spray system activates automatically.
- The spray pump draws water from the refueling water storage tank or containment sump to reduce pressure and temperature effectively.
Structural Considerations
- Containment structures feature cooling systems designed to handle potential steam releases.
- Proper thermal management is essential to prevent degradation of structural materials due to prolonged exposure to high temperatures.
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Description
This quiz focuses on the essential concepts of Pressurized Water Reactor (PWR) systems, including the functions of various nozzles such as relief and safety nozzles. Test your understanding of these critical components and their roles in reactor safety. Perfect for students and professionals in nuclear engineering.
