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Questions and Answers
What is the purpose of the sample program at a power plant?
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?
What is a representative sample?
A sample that is truly indicative of the system or process being sampled.
What is a routine sample?
What is a routine sample?
Samples having a set frequency which must be maintained within certain limits.
What is a non-routine sample?
What is a non-routine sample?
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List five critical factors that could influence a sample's validity.
List five critical factors that could influence a sample's validity.
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What is a grab sample?
What is a grab sample?
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What is a composite sample?
What is a composite sample?
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What is an on-line sample?
What is an on-line sample?
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What is the first step for obtaining a proper sample?
What is the first step for obtaining a proper sample?
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What should be ensured regarding the sample container?
What should be ensured regarding the sample container?
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List two potential hazards to be aware of when dealing with radioactive samples.
List two potential hazards to be aware of when dealing with radioactive samples.
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What is the purpose for having a post-accident sampling procedure?
What is the purpose for having a post-accident sampling procedure?
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List three reasons for obtaining a reactor coolant sample during or after a nuclear accident.
List three reasons for obtaining a reactor coolant sample during or after a nuclear accident.
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What is the special consideration associated with post-accident sampling?
What is the special consideration associated with post-accident sampling?
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What should be evaluated for the storage of a post-accident sample?
What should be evaluated for the storage of a post-accident sample?
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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.
