| 21. | Jet pumps increase the flow of water through the reactor core.
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| 22. | This solution allowed for a very compact reactor core design.
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| 23. | Since nuclear fission creates radioactivity, the reactor core is surrounded by a protective shield.
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| 24. | In its central part, the reactor core's heat is generated by controlled nuclear fission.
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| 25. | It consisted of an experimental reactor core installed in a modified S5W reactor plant.
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| 26. | The reactor core normally consists of 27 fuel elements, of about 30 kg of uranium.
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| 27. | About one-fifth of the reactor core had experienced inadequate cooling caused by uneven coolant flows.
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| 28. | The uranium-oxide fuel pellets would start to melt, releasing radioactivity into the graphite reactor core.
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| 29. | Therefore, one or more of the 200 reactor cores could conceivably sink, sooner or later.
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| 30. | While the submarine was only halfway through her design lifespan, her reactor core required refueling.
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