Radiochemistry in Nuclear Power Reactors (1996) / Chapter Skim
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1. BRIEF DESCRIPTION OF NUCLEAR POWER REACTOR SYSTEMS AND PRIMARY COOLANT CHEMISTRY
1. BRIEF DESCRIPTION OF NUCLEAR POWER REACTOR SYSTEMS AND PRIMARY COOLANT CHEMISTRY
Pages 1-10
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The boiling water reactor requires substantially lower primary coolant flow through the core than pressurized water reactors. The core flow of a BWR is the sum of the feedwater flow and the recirculation flow.
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Z ° ~ Lit in ~ lo Z IL O C,2 I ~ 111 ' ~ Z Q Z I,,,=a mmm z c o I WnlS l:)
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(by Minimize the radiation field buildup on the system component surfaces due to deposition of activated corrosion products. More detailed discussion on the BWR water chemistry quality control and guidelines can be found elsewhereLl)
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-pH - Silica (ppb) - Total Copper · Fe edwater · Power Operation - Metallic Impurities(ppb)
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The energy is transferred by the coolant from the reactor core to the steam generators where secondary steam is subsequently produced and routed to the unit turbine generator and main steam system. The primary coolant system also includes the reactor, an electrically heated pressurizer, a pressurizer quench tank and inter-connecting piping, and the chemical and volume control system (Figure IBM.
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tar I: At Jo= lo Lot {Y J LO CL ,~ Z O - ~ 0= ~ 1-6 U]
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Under the highly reducing chemistry environment, most of the radioactive impurities are expected to be present in the reduced or insoluble forms in the PWR coolant. More detailed discussion on the principals of PWR coolant chemistry control and guidelines can be found in References 3 and 5.
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~ Concentration varies from high levels early in cycle to low levels at end of cycle.
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2) Chemistry Parameter Permissible Range Electrical Conductivity pH Dissolved Oxygen Chloride Fluoride Suspended Solids Hydrogen Boron Lithium Silica Calcium Magnesium Aluminum 140 ,umho/cm 4.2-10.5 <5 ppb <0.15 ppm <0.15 ppm <1.0 ppm 25-50 cc/kg 04000 ppm 0.7 to 2.2 ppm (recommendation depending on boron concentration)
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