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NE PE > PE Trivia > Flashcards

PE Trivia Flashcards

1
Q

sintering

A

heating without melting

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2
Q

The primary interaction mechanism for 2 MeV gammas in concrete is

A

Compton Scattering

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3
Q

After the first few minutes past shutdown, the major source of decay heat in a nuclear reactor is

A

fission product decay

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4
Q

For a BWR, the major source of water for RCIC during long term recirculation is

A

suppression pool

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5
Q

In a BWR, if the normal heat removal system is still operative when the reactor is tripped, then the shutdown cooling is provided by

A

condensate from the condenser

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6
Q

Can a Geiger Mueller counter distinguish the radiation from different isotopes?

A

No. A GM counter provides no energy discrimination.

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7
Q

The enrichment of the fuel in a fast breeder reactor compared to that in a thermal reactor is

A

higher

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8
Q

Describe the relationship of fuel centerline temperature and fuel diameter for cylindrical fuel pins with an “infinitely” thin cladding and a constant coolant temperature.

A

the fuel centerline temperature is proportional to the fuel diameter squared.

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9
Q

A critical configuration of fissile material contains an extraneous (gamma, neutron) neutron source. The time behavior of this configuration increases __ with time

A

linearly

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10
Q

The physical form of Krypton is a

A

noble gas

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11
Q

The primary interaction mechanism for 2 MeV photons in concrete is

A

Compton Scattering

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12
Q

The total activity of spent fuel from a LWR first decays to a level less than that of natural uranium ore in a time (years) of nearly

A

10,000 years

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13
Q

The primary purpose of an ADS in a BWR is to

A

depressurize the BWR

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14
Q

Is bismuth germinate an effective gamma ray spectrometer?

A

No. It has poor resolution.

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15
Q

The product of milling uranium ore is

A

yellow cake, U3O8

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16
Q

Steam to the turbine from a PWR can be superheated if

A

once-through steam generators are used

17
Q

Increasing the effective delayed neutron fraction will ___ the asymptotic period

A

increase

18
Q

Increasing the effective delayed neutron fraction will ___ the size of the prompt drop (jump)

A

decrease

19
Q

A thermal reactor core cannot have a significant nuclear yield like a nuclear weapon because

A

the neutron generation time is too long

20
Q

The regulation that limits the amount of Kr-85 that can be routinely released offsite is which CFR?

A

10CFR20

21
Q

The external dose from exposure to Kr-85 is mostly due to

A

gamma rays and beta rays

22
Q

According to 10CFR30.4, a byproduct is

A

any radioactive material (WTEO SNM) yielded in or made radioactive by exposure to the radiation incident to the process of producing or utilizing SNM.

23
Q

A self-powered neutron detector si so named because it

A

operates with no applied voltage. Beta decay from the neutron-activated emitter provides the detector current.

24
Q

bismuth germanate detects

A

gammas

25
Q

a proton recoil detector counts

A

fast neutrons

26
Q

a surface barrier detector is used for

A

alpha spectrometry

27
Q

a plastic scintillator is a common

A

beta spectrometer

28
Q

Germanium has ___ gamma ray energy resolution for spectrometry

A

excellent

29
Q

Sodium Iodide and Cesium Iodide have ___ gamma ray energy resolution for spectrometry

A

moderate

30
Q

A thin shield is defined as one with

A

a buildup factor of

31
Q

What type of detector would be best to use to determine if the area is contaminated with a beta emitter?

A

Thin window GM

32
Q

What is the best fast neutron poison?

A

None. There are no materials that have significantly larger fast neutron absorption cross sections than do the fissionable materials.

33
Q

Two cylinders of plutonium content he same mass and composition. Cylinder A has an H/D=20 while Cylinder B has an H/D=1. Which cylinder will have the highest k-infinity?

A

Both will have the same k-infinity

34
Q

If the material buckling is less than the geometric buckling, then the system is __.

A

subcritical

35
Q

If a supercritical chain starts in a metal assembly of fissionable material, the first pulse of neutrons and gamma rays will last __.

A

a few hundred microseconds

NE PE (5 decks)

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