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How do they start a nuclear reactor?

Updated: 9/19/2023
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13y ago

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  1. With all control rods inserted all the way, begin inserting fuel rods.
  2. When the basic minimum operating number of fuel rods have been inserted, insert a continuous neutron source of known intensity.
  3. Measure the neutron flux in the reactor and calculate the reactor's neutron multiplication factor to determine how close you are to design predicted critical.
  4. Begin withdrawing control rods very slowly, stopping periodically and repeating step 3. Each time the neutron multiplication factor should increase.
  5. If the multiplication factor keeps increasing in step 4 while the control rods are stopped, you have reached critical. Remove the neutron source and the neutron flux in the reactor should decline slightly then become constant.
  6. You have now safely started your nuclear reactor. Congratulations!

If anything unexpected happens reinsert all control rods, remove the neutron source, find and fix the problem, and restart the procedure.

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Q: How do they start a nuclear reactor?
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