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Chapter 21: Problem 65

Which type or types of nuclear reactors have these characteristics? (a) Does not use a secondary coolant (b) Creates more fissionable material than it consumes (c) Uses a gas, such as \(\mathrm{He}\) or \(\mathrm{CO}_{2}\), as the primary coolant

Short Answer

Expert verified
The nuclear reactor type that meets the characteristics given is a hypothetical Gas-Cooled Fast Breeder Reactor (GCFBR). This type of reactor would not use a secondary coolant, create more fissionable material than it consumes, and use a gas such as helium or carbon dioxide as the primary coolant.

Step by step solution

01

(Step 1: List common types of nuclear reactors)

Some of the common types of nuclear reactors are: 1. Pressurized Water Reactor (PWR) 2. Boiling Water Reactor (BWR) 3. Heavy Water Reactor (HWR) 4. Gas-Cooled Reactor (GCR) 5. Fast Breeder Reactor (FBR) 6. Liquid Metal Fast Breeder Reactor (LMFBR)
02

(Step 2: Identify the type or types of reactors without a secondary coolant)

Among these types of reactors, only the Gas-Cooled Reactor (GCR) does not use a secondary coolant system, as it uses a gas, such as helium or carbon dioxide, for the direct cooling of the reactor core.
03

(Step 3: Identify the type or types of reactors that create more fissionable material than they consume)

Fast Breeder Reactors (FBR) and Liquid Metal Fast Breeder Reactors (LMFBR) are specially designed to produce more fissionable material than they consume, by converting fertile material into fissile material through neutron capture.
04

(Step 4: Identify the type or types of reactors that use a gas as the primary coolant)

The Gas-Cooled Reactor (GCR) uses a gas, such as helium or carbon dioxide, as the primary coolant, which directly cools the reactor core.
05

(Step 5: Determine the type or types of nuclear reactors with all given characteristics)

Now, we need to find the type or types of reactors that meet all the characteristics (a, b, and c). Based on the information we gathered in steps 2, 3, and 4: - The Gas-Cooled Reactor (GCR) meets both characteristics (a) and (c). - The Fast Breeder Reactor (FBR) and the Liquid Metal Fast Breeder Reactor (LMFBR) meet characteristic (b). None of the reactors alone meet all three characteristics; however, it is possible to have a modified type of Gas-Cooled Reactor designed as a breeder reactor. This hypothetical reactor would be called a Gas-Cooled Fast Breeder Reactor (GCFBR), which could then meet all three characteristics.

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