Sampling Methods in Power Plants

Questions and Answers

What is the purpose of the sample program at a power plant?

To obtain for analysis a small portion of the main body that is truly representative or valid.

What is a representative sample?

A sample that is truly indicative of the system or process being sampled.

What is a routine sample?

Samples having a set frequency which must be maintained within certain limits.

What is a non-routine sample?

Samples having no defined frequency, usually a sample of a treatment process. Signup and view all the answers

List five critical factors that could influence a sample's validity.

Sample Point, Sample Time, Temperature, Frequency, Sample Integrity. Signup and view all the answers

What is a grab sample?

A single sample that only represents conditions at the time of sampling. Signup and view all the answers

What is a composite sample?

A collection of grab samples from a specific point taken at regular time or flow intervals. Signup and view all the answers

What is an on-line sample?

A sample that flows continuously through an analyzer. Signup and view all the answers

What is the first step for obtaining a proper sample?

Review procedure. Signup and view all the answers

What should be ensured regarding the sample container?

They should be clean and of sufficient volume for applicable analyses. Signup and view all the answers

List two potential hazards to be aware of when dealing with radioactive samples.

Personal contamination, Radiation exposure. Signup and view all the answers

What is the purpose for having a post-accident sampling procedure?

To outline accident contingency plans for obtaining and analyzing highly radioactive samples. Signup and view all the answers

List three reasons for obtaining a reactor coolant sample during or after a nuclear accident.

To provide information related to core damage, To determine types and quantities of fission products, To provide information on coolant chemistry. Signup and view all the answers

What is the special consideration associated with post-accident sampling?

Ensure plant alignment allows for obtaining actual reactor coolant sample. Signup and view all the answers

What should be evaluated for the storage of a post-accident sample?

Radiological conditions and a plan developed with Chemistry. Signup and view all the answers

Study Notes

Purpose of Sampling at Power Plants

Obtain a representative portion for analytical validity.

Sample Definitions

Representative Sample: Indicative of the sampled system or process.
Routine Sample: Collected at predetermined intervals according to specifications.
Non-routine Sample: Collected without a set frequency, typically for specific operational needs.

Critical Factors Affecting Sample Validity

Sample Point: Location where the sample is taken.
Sample Time: Timing of the sample collection.
Temperature: Environmental conditions impacting sample characteristics.
Frequency: Regularity of sample collection affecting reliability.
Sample Integrity: Preservation of sample quality throughout collection and analysis.

Sampling Methods

Grab Sample: Represents conditions at the time of collection; predominant sampling method.
Composite Sample: Combination of grab samples over time or flow, potentially using an automatic sampler.
On-line Sample: Continuous flow sample collected through an analyzer, like a conductivity cell.

Proper Sampling Steps

Review Procedure: Familiarize with sampling protocol and resolve queries before starting.
Recirculation: Ensure sufficient system recirculation, typically around two tank volumes.
Obtain Sample Containers: Use clean containers that meet volume requirements stated in procedures.
Establish Sample Flow: Identify sample point, purge sample lines, and confirm undisturbed flow.
Collect Sample: Gather the sample as per the established flow.
Secure Flow: Maintain consistent flow during and after collection.
Note Sampling Information: Label samples accurately with relevant details.
Sample Analysis: Perform necessary analyses on collected samples.
Disposal of Sample: Follow appropriate procedures for sample disposal.
Notify Operations: Inform operations if sampling impacts them.
Complete Documentation: Ensure all records related to the sampling process are accurately filled out.

Hazards of Radioactive Samples

Personal Contamination: Risk of contamination during sample handling.
Radiation Exposure: Dangers associated with exposure to radioactive materials.

Post-Accident Sampling Procedures

Outline measures for obtaining and analyzing samples post-accident in radioactive environments.

Reasons for Reactor Coolant Sampling After an Accident

Assess core damage extent.
Determine released fission product types and quantities.
Analyze coolant chemistry and radiochemistry using various metrics.

Special Considerations for Post-Accident Sampling

Ensure the sample reflects actual reactor coolant, accounting for system alignments during safety procedures.

Post-Accident Sample Storage Expectations

Radiological conditions will be evaluated by RP, coordinating with Chemistry to develop an ALARA-focused plan for sample storage if necessary.

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Description

Explore the various sampling methods utilized in power plants to ensure analytical validity. This quiz covers definitions of representative, routine, and non-routine samples, along with critical factors affecting sample validity. Test your knowledge on the importance of proper sampling techniques for effective operations.