Term
| Reasons for chemical control |
|
Definition
| Limit reactor plant corrosion. Minimize failures, contamination, and inefficiency. |
|
|
Term
|
Definition
| defined as anything that occupies space and contains a mass. |
|
|
Term
|
Definition
| Can not be separated any further by chemical means. |
|
|
Term
|
Definition
| Smallest amount of an element you can have. |
|
|
Term
|
Definition
| Chemical combination of 2 or more atoms (same or different element). |
|
|
Term
|
Definition
| Chemical combination of 2 different elements. |
|
|
Term
|
Definition
| Uniform homogenous mixture, solute (solid, liquid, gas) and solvent (liquid or solid) |
|
|
Term
|
Definition
| Process of going from one set of chemical substances to another. Spontaneous or non-spontaneous. |
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
| Measure of the ability of water to conduct electric current. |
|
|
Term
|
Definition
| Measure of activity of H+, potential of Hydrogen. |
|
|
Term
|
Definition
| Cloudiness or haziness of a fluid caused by suspended solids. |
|
|
Term
|
Definition
| Silicon Dioxide, sampled for indication of cation/anion resins being exhausted. |
|
|
Term
|
Definition
| parts per million, parts per billion. |
|
|
Term
|
Definition
| Dose equivalent Iodine -131, E-Bar, weighted average of the sum of beta and gamma energies to ensure you are within regulation. |
|
|
Term
|
Definition
|
|
Term
|
Definition
| Lower the pH, higher the conductivity. |
|
|
Term
|
Definition
| Gradual destruction of a material usually metals, by chemical reaction with its environment. |
|
|
Term
|
Definition
| Presence of halogens, oxygen concentration hi or low, pH > 10, worse at High temp. |
|
|
Term
|
Definition
| Two different metals have physical or electrical contact with each other and immersed in a common electrolyte, or different concentration electrolyte. |
|
|
Term
| Intergranular Stress Corrosion Cracking |
|
Definition
| Boundaries of crystallites of material are more susceptible to corrosion. Chromium is added for protection. Chromium depletes above 950F. |
|
|
Term
|
Definition
| Requires High Temp, Susceptible material, Stress, Oxidizer, and Strong acid ions. |
|
|
Term
| Possible solutions to IGSCC |
|
Definition
| Hydrogen injective to minimize free oxygen, maintain chloride and sulfate to minimum. |
|
|
Term
|
Definition
| Radiolysis, primary source power ops. Shutdown- air exposure. To minimize: Fill and vent systems, inject hydrogen, remove and gases with air injectors. |
|
|
Term
| Effects of excess oxygen on RPV |
|
Definition
|
|
Term
| Effects of Hydrogen on RPV |
|
Definition
| Can cause N16 to form volatile ammonia. |
|
|
Term
| Why Coolant chemistry limits for conductivity and chlorides in RPV change upon operation condition |
|
Definition
| Reactor is open to the environment. |
|
|
Term
| Describe process of ion exchange and its effect on conductivity |
|
Definition
| Purifying water by exchanging undesired ions for desired. Reduces conductivity. |
|
|
Term
|
Definition
| has better filter properties but less ion exchange capabilities. |
|
|
Term
|
Definition
| doesnt filter well but has extensive ion exchange capabilities. |
|
|
Term
| Effect of excessive DP on demineralizer |
|
Definition
| Compacts resin and leads to channeling. Flow too high or bed is clogged. |
|
|
Term
| Reason for sampling inlet and outlet of demineralizer |
|
Definition
| Determine decontamination factor, outlet should be much cleaner than inlet. |
|
|
Term
| What causes and what is channeling in demineralizer |
|
Definition
| Changes in flow and pressure causes areas of least resistance and reduced ion-exchange. |
|
|
Term
| Why temperature and flow limits are imposed on demineralizers |
|
Definition
| Changes in flow can lead to channeling, high temperatures can break down resin and reduce the capability of resin from not releasing ions. |
|
|
Term
| What parameters are used to determine demineralizer bed condition |
|
Definition
| Decontamination Factor. Inlet/Outlet |
|
|
Term
| 3 sources of radioactivity in reactor vessel |
|
Definition
| Activated coolant products, Activated Corrosion Products, Activated fission products. |
|
|
Term
| Methods by which fission products enter the reactor coolant |
|
Definition
| Recoil activity, Equilibrium activity, Diffusion. |
|
|
Term
|
Definition
| Trapped uranium found in cladding of fuel elements. |
|
|
Term
|
Definition
| small defect in the fuel element. |
|
|
Term
|
Definition
| Process which fission process diffuse through t he pores of the fuel pellet to the surface then into coolant through defect, depends on fuel temp. |
|
|
Term
| Identify source, half life, and radiological hazard of N-16 |
|
Definition
| Source is excess hydrogen, half life of 7.1 seconds, and radiological hazard of 6.1Mev. |
|
|
Term
| Describe methods of reducing/removing amount of radioactive materials in the reactor coolant |
|
Definition
| Through ion exchange and filters. |
|
|
Term
| Describe how hydrogen is produced in reactor vessel including post accident concerns |
|
Definition
| Zirconium and water reaction releases hydrogen causing hydrogen build up in the steam cycle. |
|
|
Term
| Explain how a reactor coolant sample can indicate condition of fuel cladding |
|
Definition
| High concentration of iodine in the reactor coolant during steady state operations may be an indication of a fuel cladding defect. |
|
|
Term
| Explain why substance with chlorine and bromine content is added to circulating water system |
|
Definition
| To reduce biological growth. |
|
|
Term
| Explain effect of resin intrusion on the reactor coolant system in terms of conductivity and coolant activity |
|
Definition
| Plate out on fuel cladding surfaces causing a reduction in heat transfer across fuel pin. General output will decrease. |
|
|
