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Neutronics > Lecture 7 > Flashcards

Lecture 7 Flashcards

1
Q

Flux shape for infinite slab

A
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2
Q

Flux shape in infinite cylinder

A
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3
Q

Flux shape in finite cylindrical core

A
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4
Q

Buckling in finite cylinder

A
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5
Q

Peak to average power

A
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6
Q

Diffusion lengths

A
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7
Q

Diffusivity equation

A
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8
Q

Multiplication factor with two group approximation

A
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9
Q

Migration length equation

A
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10
Q

Reflector savings for

a >> M

A
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11
Q

Reflector savings for

a << M

A
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12
Q

Buckling in reflected reactor

A
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13
Q

Adding a reflector _____ the flux distribution, thus ____ the ratio of peak to average flux

A

flattens, lowers

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14
Q

The worth changes most rapidly when the tip is _______ of the core, where the flux is largest.

A

near the midplane

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15
Q

Buckling change with reactivity change equation

A
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16
Q

Rod bank has large enough effects in reactivity and on the flux distribution that the ______ technique is no loger applicable

A

pertubation

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17
Q

Change in non-leakage probablity w/ different migration length and buckling

A
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18
Q

Increased fuel temperature results in a ________ in the resonance escape probablity because of doppler effects

A

decrease

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19
Q

Magnitidue of fuel temp coefficient _____ with increasing fuel temperature

A

decreases

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20
Q

Becomes more _______ with burnup because of ______

A

negative, Pu-240

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21
Q

Moderator temperature coefficient

A
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22
Q

Moderatore coefficient derives primarily from _____ changes with changes in the __________ playing a secondary role

A

density, thermal spectrum

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23
Q

MTC becomes more ______ with boron concentration because of larger reduction in poision content from reduced density.

A

positive

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24
Q

MTC becomes more _____ with burnup primarily because of reduction in boron concentration

A

negative

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25
Q

Large negative value would be limiting for a ________ incidence

A

cold water injection

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26
Q

MTC becomes more _______ with control rod insertion because of hardened neutron spectrum and increased leakage

A

negative

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27
Q

For the fuel temperature coefficient for fast reactors, doppler effect is ______ in magnitude

A

smaller

28
Q

For the coolent temperature coefficient for fast reactors, decreased density _____ the neutron spectrum and thus increases ____ and ____.

A

hardens, eta, kinfinite

29
Q

For the coolent temperature coefficient for fast reactors, decreased density _____ the migration length, and thus ______ leakage, resulting in ______ reactivity.

A

lengthens, increases, increased.

30
Q

Isothermal temperature coefficient, αT

A

αf + αc

31
Q

Power coefficient αp=

A
32
Q

In PWR, power coefficient becomes ______ with burnup

A

more negative

33
Q

The temperature defect is

A

reactivity decrease from cold shutdown state to hot zero power condition

34
Q

Power defect is

A

reactivity decrease from hot zero power to hot full power

35
Q

Excess reactivity is the value that ρ would take if

A

all moveable control poisions were instantiously removed from the core.

36
Q

Factors determining excess reactivity

A

temp defect, power defect, cycle length

37
Q

Transient heat transfer model,

A
38
Q
A
39
Q

Very slow transient with small step reactivity insertion, or Quasi-steady state heat transfer equation

A
40
Q

With .95$ insertion, _____ before fuel gains enough temp for ______

A

large power spike, negative feedback

41
Q

Without temperature feedback, transients would pass through ______ at one second

A

prompt critical

42
Q

Reactavity at t with reactivity insertion, ρ(t)=

A
43
Q

Short time phenomena:

A

typical time intervals of milliseconds to seconds, transient analysis

44
Q

Medium time phenomena:

A

hours to days, Xe and Sm effects

45
Q

Long time phenomena:

A

several months or years, fuel depletion analysis

46
Q

I-131 reaches it’s saturation value _____, and will be proportional to the _______

A

quickly, reactor power

47
Q

Cs-137 increases ______ with time over the few years the fuel is in the reactor and the amount is proportional to ______

A

linearly, the total energy produced

48
Q

Equilibrium concentration of Xenon, X(∞) =

A
49
Q

Xenon after reactor shutdown, X(t) =

A
50
Q

Xenon reactivity effect, ρ(t) =

A
51
Q

For a sufficiently large operating flux, the xenon concentration _____ following shutdown.

A

rises

52
Q

Peak concentration occurs _____ hours after shutdown

A

11.3

53
Q

Samarium concentration, S(∞) =

A
54
Q

Equilibrium concentration of Pm and I

A
55
Q

Samarium after reactor shutdown, S(t) =

A
56
Q

Samarium concentration _____ following shutdown

A

rises

57
Q

Uranium concentration, N(t) =

A
58
Q

conversion ratio, CR(t) =

A
59
Q

Power as function of p’’‘max, peaking factor, and volume

A
60
Q

The achievable maximum power density is dependent on _______ properties and that the _______ and _____ that can be tolerated

A

material, temperatures, pressures

61
Q

Fq=

A

FrFxFl

62
Q

Fq for a uniform cylindrical core =

A

3.63Fl

63
Q

p’’‘(r,z) =

A
64
Q

volume averaged coolant outlet temp To =

A
65
Q
A
66
Q

Average fuel temp Tf=

A
67
Q

The temperature at the rod’s hottest point, which is along it’s centerline, determines the limitation on the _______

A

linear heat rate

Neutronics (7 decks)

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