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Module 9 Rad Release Systems > N64 Offgas > Flashcards

N64 Offgas Flashcards

1
Q

What is the purpose of the catalytic recombiner?

A

Remove hydrogen by recombining it with oxygen at high temperatures

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2
Q

What cools the offgas condenser

A

TBCW

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3
Q

What does the water separator do?

A

Removes water vapor from condenser exhaust

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4
Q

What signals will auto close the F060 Valve

A

2 HiHiHi
1 HiHiHi and 1 INOP
2 downscale/INOP signals

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5
Q

Will the F060 valve re-open when the signal clears?

A

Yes

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6
Q

What monitor is the F060 Valve closure from?

A

Offgas post-treat rad monitor

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7
Q

What cools the off gas cooler condenser

A

Glycol

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8
Q

What cools the offgas dryer chiller?

A

Glycol

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9
Q

What cools the glycol refrigeration system?

A

TBCW

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10
Q

What is the purpose of offgas?

A

Receive air from SJAEs and process for decay and/or removal of gasses and radioactive isotopes

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11
Q

Why is there a low temperature of off gas?

A

Reduces the possibility of explosion from hydrogen buildup

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12
Q

What is the hold time for Krypton and Xenon?

A

35 hours for Kr and 32 days for Xe

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13
Q

What heats the offgas preheater?

A

Equalizing header

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14
Q

What’s the purpose of the pre-heater?

A

Raises the temperature of offgas to 350°F required for recombining

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15
Q

What do the oxygen and hydrogen monitoring systems do?

A

Monitors flow for hydrogen<2% and oxygen 15 to 35%

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16
Q

What is the purpose of the hold up line and where is it located?

A

Provide time for decay of shorter lived isotopes

Radwaste tunnel

17
Q

What fills the loop seal for it?

A

CRWST

18
Q

What component reduces the explosive limit of hydrogen

A

Catalytic Recombiner

19
Q

What is the purpose of the pretreat rad monitor?

A

Detect fuel leakers

20
Q

Will pre-treat isolate anything?

A

No, alarm only

21
Q

What is used to suppress fires in the charcoal beds?

A

Nitrogen

22
Q

How does the F060 fail?

A

Open

23
Q

Where does F060 exhaust to?

A

Radwaste ventilation

24
Q

What should be bypassed during initial offgas startup and why?

A

Charcoal adsorber beds So they don’t get wet and not adsorb as well

25
Q

Order of offgas components

A

Prefilter - Catalytic Recombiner - offgas preheater - water separator - hold up line - cooler condenser - Moisture separator - prefilter - Dryer - Gas cooler - charcoal adsorber - after filter

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Module 9 Rad Release Systems (10 decks)

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