1. The principle of a nuclear-fission reactor is summarized below. H,0 235U + n° 137TE + 97Zr + 2n° Нeat A. Why does this process not violate the first law of thermodynamics? B. The energy released from fission is about 200 MeV per fission event or 3.2-10-11 J per 235U nucleus. The fission of 1 g of 235U generates about 1 MW of thermal power; thus, a reactor that contains 1 kg of 235U fuel generates about 1 GW (10° W). If the reactor core is immersed in a heat bath containing 8.7.105 liters of water (12 m x 6 m x 12 m) initially at 25°C, how long will it take for the water to begin to boil off? Assume that the heat capacity of water is constant and that there is no heat lost from the reactor coolant to the surroundings. C. In order to cool the core and prevent a meltdown, reactors are designed with recirculating cooling systems. What is the minimum flow rate in ft/min needed to keep the reactor running properly? Assume that the cooling water has an average temperature of 50°C.

1. The principle of a nuclear-fission reactor is summarized below. H,0 235U + n° 137TE + 97Zr + 2n° Нeat A. Why does this process not violate the first law of thermodynamics? B. The energy released from fission is about 200 MeV per fission event or 3.2-10-11 J per 235U nucleus. The fission of 1 g of 235U generates about 1 MW of thermal power; thus, a reactor that contains 1 kg of 235U fuel generates about 1 GW (10° W). If the reactor core is immersed in a heat bath containing 8.7.105 liters of water (12 m x 6 m x 12 m) initially at 25°C, how long will it take for the water to begin to boil off? Assume that the heat capacity of water is constant and that there is no heat lost from the reactor coolant to the surroundings. C. In order to cool the core and prevent a meltdown, reactors are designed with recirculating cooling systems. What is the minimum flow rate in ft/min needed to keep the reactor running properly? Assume that the cooling water has an average temperature of 50°C.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.

Question

1. The principle of a nuclear-fission reactor is summarized below.
H,0
235U + n°
137TE + 97Zr + 2n°
Heat
A. Why does this process not violate the first law of thermodynamics?
B. The energy released from fission is about 200 MeV per fission event or
3.2-10-11 J per 235U nucleus. The fission of 1 g of 235U generates about 1 MW of thermal
power; thus, a reactor that contains 1 kg of 235U fuel generates about 1 GW (109 W).
If the reactor core is immersed in a heat bath containing 8.7-105 liters of water (12 m x
6 m x 12 m) initially at 25°C, how long will it take for the water to begin to boil off?
Assume that the heat capacity of water is constant and that there is no heat lost from
the reactor coolant to the surroundings.
C. In order to cool the core and prevent a meltdown, reactors are designed with
recirculating cooling systems. What is the minimum flow rate in ft/min needed to keep
the reactor running properly? Assume that the cooling water has an average
temperature of 50°C.

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