LEVEL III QUESTIONS PRESSURE CHANGE MEASUREMENT TESTING METHOD

The general gas law showing the relationship of pressure, temperature and volume of a gas is expressed by which one of the following relationships?

• 
• 
• PV = nRT or P1T2 = P2T1 (when V1 = V2)
• PV = constant or P1V2 = P2V1 (when T1 = T2)

Specifications for final pressure change measurement tests of components often list the allowable as a leakage rate in units of mass flow per unit of time. To convert this for a procedure to an equivalent allowable pressure loss per unit of time, which of the following relationships would be the correct one to use?

• 
• 
• 
• 

A large volume nuclear containment system has an allowable total leakage rate La given as a percent per time of the total contained system mass at test pressure. To ensure that small volume system components leak no more than their respective share of the system total allowable La, where realistic or possible, a specification should assign each component an allowable leakage rate that is:

• equal to one hundredth the system allowable since there are normally about one hundred system components that must be individually leakage rate tested.
• equal to a 1 psig per hour pressure loss at test pressure.
• equal to a percent per unit of time of 0.60 La but with that percent based on the component contained mass at test pressure.
• equal to one twentieth the system allowable since there are normally about twenty system components that must be individually leakage rate tested.

When the pressure change per unit of time at test pressure for a system is known, to determine the total leakage rate for that system in mass flow per unit of time, it is necessary to know the total:

• number of leaks in the system.
• contained volume of the system.
• type of pressure gage in the system.
• surface area of the system.

Assuming uniform temperature, the amount of pressure change per unit of time at test pressure for a given system is dependent on the total system:

• leakage rate and configuration.
• configuration and volume.
• barometric pressure and leakage rate.
• volume and leakage rate.

One way to increase the accuracy and reliability of the results of a pressure change measurement test is to:

• extend the time period of the test.
• use a reliable person to record the gage readings.
• use a reliable dewpoint sensor.
• shorten the time period of the test.

For very short duration pressure change measurement tests of systems such as gasket interspaces and leak chase (test channel) zones, it is always necessary to measure which two of the following variables?

• Volume and temperature.
• Absolute pressure and skill factor.
• Barometric pressure and dewpoint,
• Time and gage pressure.

For short duration pressure change measurement tests of small volume systems, which of the following are two of the more important features or characteristics of the pressure gage used?

• Repeatability and readability.
• Manufacturer and repeatability.
• Needle length and sensitivity.
• Readability and inlet diameter.

An ordinary pressure dial gage of adequate size, range and readability is available for a pressure change measurement test. For this type of leak test, as a general rule, this gage should have a typical accuracy in the range of:

• the smallest scale graduation.
• one tenth the smallest scale graduation.
• ±0.10% of the full scale.
• ±0.25% to 0.33% of the full scale.

The two acceptable test methods for performing an integrated leakage rate test of a primary nuclear reactor containment system are known as the:

• absolute method and reference vessel method.
• constant pressure flow method and verification method.
• constant flow method and reference vessel method.
• temperature correction method and partial pressure method.