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ACADs (08-006) Covered Keywords

Plant Chemistry Overview. ACADs (08-006) Covered Keywords

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ACADs (08-006) Covered Keywords

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  1. Plant Chemistry Overview ACADs (08-006) Covered Keywords Atoms, molecules, acids, bases, states of matter, conductivity, pH, Periodic Table of Elements, elements, mixtures, solutions, compounds, properties, analysis methods, states of matter, units of measure, vapor pressure, corrosion, basic water chemistry control, water treatment, sources of impurities, control methods, cation. Description Supporting Material

  2. Power Plant Chemistry Overview IRSC EE 1580

  3. Desired Outcome (Terminal Obj.) • The student will be able to explain and apply the basic concepts of chemistry fundamentals, including water chemistry control and reactor water chemistry.

  4. Enabling Statements: Competency 6 • Explain the basic fundamentals of chemistry including: • Atoms • Molecules • Acids and Bases • States of Matter • Conductivity • pH

  5. Enabling Statements: Competency 6 • Explain how to read and interpret information from the Periodic Table of Elements.

  6. Enabling Statements: Competency 6 • Define: • Elements • Mixtures • Solutions • Compounds

  7. Enabling Statements: Competency 6 • Explain Properties and Analysis Methods

  8. Enabling Statements: Competency 6 • Explain States of Matter • Gases • Liquids • Solids

  9. Enabling Statements: Competency 6 • Define units of measure: • Atomic Number • Atomic Weight • AMU

  10. Enabling Statements: Competency 6 • Explain characteristics of gases

  11. Enabling Statements: Competency 6 • State the relationship between the temperature of a liquid and its vapor pressure

  12. Enabling Statements: Competency 6 • Explain corrosion chemistry and monitoring, including • Types of corrosion • Characteristics, and • Prevention.

  13. Enabling Statements: Competency 6 • Explain primary and secondary water chemistry control, including: • Types, sources and effects of impurities • Sampling methods • Parameters monitored • Principles of water treatment

  14. Enabling Statements: Competency 7 • Explain basic water chemistry control fundamentals, including the following: • Effects of impurities (such as increased corrosion rates, reduction in heat transfer area, tube failure in Steam Generators)

  15. Enabling Statements: Competency 7 • Explain basic water chemistry control fundamentals, including the following: • Ion Exchange Theory (Anion, Cation, Mixed Bed, Bed Exhaustion, Decontamination Factor)

  16. Enabling Statements: Competency 7 • Explain basic water chemistry control fundamentals, including the following: • Parameters monitored: pH, Conductivity, Sodium, Chlorides, Flourides, Sulfates, hardness, silica, etc.

  17. Enabling Statements: Competency 7 • Explain basic water chemistry control fundamentals, including the following: • Principles of water treatment (Filters, RO, IX)

  18. Enabling Statements: Competency 7 • Explain basic water chemistry control fundamentals, including the following: • Sources of impurities (e.g. tube leaks)

  19. Enabling Statements: Competency 7 • Explain basic water chemistry control fundamentals, including the following: • The corrosion process including types, characteristics and prevention • Water chemistry control methods (such as IX), O2 control with chemistry (hydrazine or N2) and, pH Control.

  20. Enabling Statements: Competency 7 • Explain reactor water chemistry fundamentals, including the following: • Control/removal of impurities (such as IX, Chemical addition, hydrogen addition, hydrazine and degassing) • Effects of impurities (such as increase in corrosion rates, total gases, local radiation levels)

  21. Enabling Statements: Competency 7 • Explain reactor water chemistry fundamentals, including the following: • Hydrogen gas in reactor water for Oxygen control • Radiolysis and recombination (Such as water/ammonia and the effects on pH)

  22. Enabling Statements: Competency 7 • Explain reactor water chemistry fundamentals, including the following: • Sources of impurities (Such as air intrusion, IX exhaustion • Types of impurities (Such as Chlorides, Flourides, Oxygen and Hydrogen)

  23. Enabling Statements: Competency 6 • Explain the basic fundamentals of chemistry including: • Atoms • Elements • Molecules • Acids and Bases • States of Matter • Conductivity • pH • Units of Measure.

  24. Explain the basic fundamentals of chemistry: Atoms • All matter is composed of atoms, existing individually or in combination with each other. • An atom is an extremely small electrically-neutralparticle. • It is the smallest unit involved in the chemical change of matter

  25. Explain the basic fundamentals of chemistry: Atoms • Atoms themselves are composed of even smaller subparts. • An atom is composed of a positively-charged nucleus orbited by one or more negatively-charged particles called electrons

  26. Atoms

  27. Elements • The number of PROTONS in an atom define the ELEMENT (e.g., Hydrogen, Oxygen, Sodium) • All isotopes of the same ELEMENT have the same number of protons.

  28. Explain the basic fundamentals of chemistry: Atoms  Elements • An atom is classified chemically by the number of protons in its nucleus. • Atoms that have the same number of protons in their nuclei have the same chemical behavior. • Atoms that have the same number of protons are grouped together and constitute a chemical element.

  29. Explain the basic fundamentals of chemistry: Molecules • Molecules are groups or clusters of atoms held together by means of chemical bonding. • There are two types of molecules; • molecules of an element and • molecules of a compound.

  30. Explain the basic fundamentals of chemistry: Molecules • Molecules of an ELEMENT: In certain cases, two single atoms of an element can be attracted to one another by a bond to form a molecule.

  31. Explain the basic fundamentals of chemistry: Molecules • Molecules of Compounds: • Two or more atoms of different elements held together by bonds form a compound. • The molecule is the primary particle of a chemical compound.

  32. Explain the basic fundamentals of chemistry: Molecules • Molecules of Compounds:

  33. Explain the basic fundamentals of chemistry: Molecules Examples of Molecules of compounds: • hydrogen chloride (HCl), • water (H2O), • ammonia (NH3 ).

  34. Explain the basic fundamentals of chemistry: Acids and Bases

  35. Acids and Bases: • Different substances respond differently in solution. How substances behave in water is of special interest to the power industry. The interactions of water and acids, bases, or salts are of special interest because water is used in many industries.

  36. Acids: • Acidsare substances that dissociate in water to produce hydrogen (H+). • Strong Acids have LOW pH values.

  37. Acids: • An example of a common acid is sulfuric acid, H2 SO4 . In solution, H2SO4 dissociates to form hydrogen and sulfate ions

  38. Bases: • Bases are substances that produce hydroxide ions (OH-) in water solutions. • Strong Bases have HIGH pH values

  39. Bases: • An example of a common base is sodium hydroxide, NaOH. In solution, it dissociates to form sodium ions and hydroxide ions

  40. Acids and Bases • When an acid reacts with a base, two products are formed; water and a salt. A salt is an ionic compound composed of positive ions and negative ions. • The ionic bond is what keeps salts in their molecular form.

  41. States of Matter • The term states of matterrefers to the physical forms in which matter exists: solid, liquid, and gas.

  42. States of Matter • Solids are characterized as having both a definite shape and a definite volume. In a solid, the forces that keep the molecules or atoms together are strong. Therefore, a solid does not require outside support to maintain its shape.

  43. States of Matter • Liquids have definite volumes but indefinite shapes and are slightly compressible. Liquids take the shape of their containers. The forces that keep a liquid's molecules or atoms together are weaker than in the solids.

  44. States of Matter • Gases are readily compressible and capable of infinite expansion. They have indefinite shape and indefinite volume. Of the three states, gases have the weakest forces holding their molecules or atoms together.

  45. Conductivity • Conductivity is a measure of the ability of a substance to allow electron flow.

  46. Conductivity • Conductivity of reactor facility water is measured to provide an indication of dissolved ionic substances in the coolant

  47. Conductivity • In the context of corrosion, conductivity indicates the amount of ions in solution, which relates directly to the potential of corrosion taking place.

  48. Conductivity • Treating the water by softening and demineralization removes the dissolved solids and reduces the conductivity.

  49. pH • pH is defined as the negative logarithm of the hydrogen concentration, represented as [H+] in moles/liter in a solution. • The pH of pure water at 25 C is 7. • pH values less than 7 indicate an acidic solution and values greater than 7 indicate a basic or alkaline solution.

  50. pH and Corrosion • The corrosion rate of iron in high temperature water is lower in the pH range of 7 to 12 than (Neutral to slightly basic) it is at either lower or higher pH values

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