Term
| Identify and describe the six basic reactor systems |
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Definition
1. Fuel
2. Moderator
3.Control Devices
4.Coolant
5. Instrumentation
6. Containment Vessel |
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Term
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Definition
| UO2 which fissions after absorbing slow neutrons |
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Term
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Definition
| Slows down neutrons so they are fissionable |
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Term
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Definition
| Can vary the number of neutrons available in core |
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Term
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Definition
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Term
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Definition
| Plant control and other devices |
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Term
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Definition
| Gives structure and sheilding |
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Term
| What are the four reactor design objectives |
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Definition
1. Economical Fuel Cycle
2. High thermal efficiency
3.Safety and reliability
4.Neutron economy |
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Term
| What is the primary drawback identified in the text for BWR'S Compared to PWR'S |
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Definition
| BWRS contamination is spread through the whole system |
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Term
| Describe breifly how the reactor power level is controlled |
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Definition
| Through the use of control rods and chemical shims. There are poisons and absorbs the neutrons so they dont fission |
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Term
| What is the purpose of the reactor vessel |
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Definition
| Primary function of a reactor vessel are core containment , primary coolant flow direction and guiding of control rods |
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Term
| What two additional reactor components does a PWR have that a BWR does not and what functions do they serve |
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Definition
1 Stream generator- transfers heat form pressuried water so no contamination enters the rest of the loop
2. pressurizers- to create pressure in the reactor vessel so water doesn't boil at lower temps |
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Term
| What is approximate operating pressure and electrical output of a PWR |
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Definition
| 1200 MWe output and 3800 MWt |
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Term
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Definition
| wet steam contains water droplets |
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Term
| What is typical operating pressure and temperature of a BWR |
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Definition
Pressure 1040 PSIA
Temp. 548 F |
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Term
| On a BWR explain why control rods enter through the bottom of the reactor vessel |
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Definition
| they enter upward through the bottom head in the powered shutdown made against the force of gravity. Control rods enter the bottom of the vessel to avoid the steam separators and dryer located in the top of the vessel |
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Term
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Definition
| Chemical shim is used during a normal operating by controlling the concentration of boric acid in the coolant, reactor power is maintained or altered, its used to aid in the absorption of neutrons so they don't fission |
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Term
| What is the range of per cent of enrichment U-235 for intail fueling and refueling |
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Definition
U-235 ranging from 1.6 WT% to 2.20 WT% of all total uranuim
Reloading range from 2.4% to 2.6% |
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Term
| Briefly describe how a neutron detector works |
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Definition
| A neutron detector uses the gas BF3 which ionizes which is then by the electrical components of the detector |
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Term
| what is "CRUD" and where does it come from |
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Definition
| Chalk river unidentified deposits, its is a combination of erosion and rust products outer coating the fuel rods |
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