文档介绍：PROBLEM 2-7N QUESTION
Relationships Between Assemblies Of Different Pin Arrays
A utility wishes to replace the fuel in its existing PWR from 15x15 fuel pin array assemblies to
17x17 fuel pin array assemblies. What is the ratio of the core average linear power, q′, in the new
core to the old core, assuming reactor power length and number of fuel assemblies are maintained
constant, .,
q′
a) 17x17 = ?
q′
15x15
q″
b) 17x17 = ?
q″
15x15
Page 1 of 1 page Fall 2004
PROBLEM 3-6N QUESTION
Energy Sources In A Typical PWR
Compute the energy sources in a typical PWR (Sequoyah - Table 1-2) which the containment
might have to modate.
1 . Stored Energy in primary coolant. Should enthalpy or internal energy be used: Explain.
2 . Stored energy in secondary side of the steam generator (assume 89 m3 of saturated liquid at
secondary system conditions).
3 . Decay Heat – integrated release over a one day shutdown period after infinite operation.
4 . Chemical Reactions –
a) metal-water reaction of 75% of the zircaloy clad.
b) reaction of 25% of the zircaloy clad with CO2 to produce C which then reacts with CO2
to produce CO. Assume reactions are constrained only by amount of zircaloy available.
5 . Combustion of hydrogen and carbon monoxide product in (4) above.
Reaction Heat
5
Zr + 2H2O → ZrO2 + 2H2 + J/mol of Zr
→ 5
Zr + CO2 ZrO2 + C + J/mol of CO2
→ 5
C + H2O CO + H2 - J/mol of H2O
→ 5
C + CO2 2CO - J/mol of CO2
* Please pay attention to Heat Unit
Combustion Reactions
5
H + 1 O → H O + J/mol of H2
2 2 2 2
5
CO + 1 O → CO + J/mol of CO
2 2 2 2
Page 1 of 1 page Fall 2004
PROBLEM 3-7N QUESTION
Decay Heat From A PWR Fuel Rod
A decay heat cooling system is capable of removing 1 kW from the surface of a typical PWR
(Sequoyah, Table 1-2; and PWR(W), Table 2-3) fuel rod. Assume the rod has operated for an
essentially in