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A certain nuclear power plant has a mechanical power output (usedto drive an electric generator) of 400 MW . Its rate of heat inputfrom the nuclear reactor is 1280 MW.

a.What is the thermal efficiency of the system?
b.At what rate is heat discarded by the system?

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Casey Durgan
Casey DurganLv2
28 Jun 2019
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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

A Brayton cycle is the same as the Rankine cycle, but it takesplace in the ideal gas region of states. A large stationary Braytoncycle gas-turbine power plant delivers a power output of 100 MW toan electric generator. The minimum temperature in the cycle is 300K, and the maximum temperature is 1600 K. The minimum pressure inthe cycle is 100 kPa, and the compressor pressure ratio is 14 to 1.Assume that the compressor has an isentropic efficiency of 85% andthe turbine an isentropic efficiency of 88%.

Q1. Calculate the power output of the turbine.
Q2. What fraction of the turbine output is required to drive thecompressor?
Q3. What is the thermal efficiency of the cycle?
Q4. What are the ways to improve this efficiency?
Q5. Describe a practical application of such cycle.
Q6. Draw all diagrams (cycle, P-v, T-s)

This is the question: Problem 79 Chapter 7inPhysics: For Scientistsand Engineers 6th ed.
A large nuclear power plants produces 1000 MW of electrical powerbynuclear fission.
(a) By how many kilograms does the mass of the nuclearfueldecrease in one year? (Assume an efficiency of 33 percent foranuclear power plant.)
(b) In a coal-burning power plant, each kilogram ofcoalreleases 31 MJ of thermal energy when burned. How manykilograms ofcoal are needed each year for a 1000-MW coal burningpower plant?(Assume an efficiency of 38 percent for a coal-burningpowerplant.)


Steam generators in a "typical" PWR in the USA have thefollowing operating conditions:

Side Pressure,MPa(absolute)
Primary loop 15.5
Secondary loop 6.2

Inlet Temperature,°C Outlet Temperature,°C

Primary side 315 (liquid water) 275 (liquid water)



Seconadary loop 220 (liquid water) 275 (saturated steam)



(1) Calculate the mass flow rate (gallon per minutes) in theprimary and secondary loop
respectively if the reactor is rated at 1000 MWe.
(2) The temperature of the sea water used in the condensing processincreases by
approximately 11.5 °C. Note that 34% of thermal power has beenconverted to
mechanical (turbine)-electrical (generator). Calculate the massflow rate (gallon per
minutes) in the tertiary loop.
(3) About 11 000 gallon per minutes of water is lost to evaporationin a cooling tower.
Calculate the heat lost by evaporation in W.

The thermal efficiency of a nuclear powerplant is 34%

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