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pkress

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- Homework Statement
- Using the BWR data from Appendix IV of the textbook (NE, Knief), calculate the minimum critical power ratio for 100% power assuming the following axial linear power shape

a) The axial linear power shape can be expressed as

q’(z) = q’(ref)e^(-az/L)sin (pi(z)/L)

where a = 1.96. Determine q’(ref) such that q’(max) = 44 kW/m

b) The critical bundle power is 9319 kW

- Relevant Equations
- Minimum Critical Power Ratio = Critical Power/Operating Power

(unfortunately, the textbook is sparse in its relevant equations and examples)

Im having a really tough time with this problem, I am assuming that in order for q'(z) to be a maximum, e^(-az/L)sin (pi(z)/L) must be a maximum. I believe this occurs when the derivative with respect to with respect to z/L is zero, which gives me z = 0.322L, but I am not sure if this is correct or where to go from here. Any help would be greatly appreciated. A clearer version of the problem is attached( I am mainly referring to the second problem, but I am having some issues with the first as well so any help with that one is appreciated too.)

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