Gas Cooled Experiments

Question 1

What is a gas cooled/lead experiment?

Answer 1

Encapsulated experiment with instrumentation lines exiting the capsule and can have a system for measuring and controlling temp and pressure.

Question 2

What two gasses are typically used in gas cooled experiments?

Answer 2

helium/neon or helium/argon

Question 3

How is temperature controlled across the gas gap?

Answer 3

Adjusting the ratio of gases.

Question 4

Impact of helium concentration on cooling?

Answer 4

Helium has a higher thermal conductivity than neon or argon, therefore more helium equals more heat removal.

Question 5

Draw one-line diagram of gas cooling system

Answer 5

Question 6

In which cubicle are gas cooled experiment equipment located?

Answer 6

1B

Question 7

How are the gases blended in ratio?

Answer 7

Via mass flow control cabinet.

Question 8

What is the emergency cooling gas for gas cooled experiments?

Answer 8

Facility helium supply.

Question 9

How is excess bypass flow limited in the helium line?

Answer 9

Orifice

Question 10

Which gasses are cooling/heating gases?

Answer 10

Helium is a cooling gas
Argon/neon are heating gases.

Question 11

Advantage of argon over neon?

Answer 11

Argon has larger temp control range.

Question 12

Disadvantage of argon to neon?

Answer 12

Argon activates

Question 13

What is the function of the 3-way valve positions?

Answer 13

1 - helium-neon/argon blend to the experiment
2 - helium dump to the experiment (to place test in a safe condition)

Question 14

What is the purpose of the moisture sensor in the gas cooled experiments?

Answer 14

Checks for failure of capsule pressure boundary.

Question 15

What impact does a high moisture in a gas cooled test have?

Answer 15

Automatic isolation of the test.

Question 16

Bypassing moisture interlock?

Answer 16

Possible to bypass via DCS.

Question 17

Where is the argon delay tank?

Answer 17

OSCC Corridor

Question 18

How long does it take for Argon gas to pass through the delay tank?

Answer 18

~35 hours

Question 19

What is the half-life of Ar-41?

Answer 19

1.82 hours

Question 20

How many tubes deliver gas flow to/from the experiment?

Answer 20

6 lines influent, 1 line effluent

Question 21

Where do the experiment lines connect to the experiment?

Answer 21

Through an L-flange in the nozzle trench.

Question 22

What are the power supplies to gas experiment loops?

Answer 22

Commercial power 1C-E-85
Diesel/Commercial power E-244/1285
UPS power E-85

Question 23

Give each RPU power supply.

Answer 23

RPU-1 1C-E-84 Comm
RPU-2 1C-E-84 Comm
RPU-3 1C-E-84 Comm
RPU-4 E-244 Diesel/Comm
RPU-5 E-244 Diesel/Comm
RPU-6 E-1285 Diesel/Comm
RPU-7 E-1285 Diesel/Comm

All backed by E-85 LOCS UPS

Question 24

Where are RPU-1 and 2 located?

Answer 24

Outside sub-pile room.

Question 25

Where are RPU-3/4/5 located?

Answer 25

Outside 1B primary cubicle

Question 26

Where are RPU-6/7 located?

Answer 26

Outside 1A Primary Cubicle

Question 27

Where is engineering workstation 2 located?

Answer 27

Second basement, east side

Question 28

Where is LOCS 2 Safe located?

Answer 28

Second Basement, east side

Question 29

Describe Helium purge.

Answer 29

Occurs automatically on HiHi Temp alarm. Sets Helium mass flow controller to 100% in manual and neon to 0%. Can be manually initiated from DCS

Question 30

Describe Helium dump.

Answer 30

Occurs at 50F above HiHi Temp alarm. Full helium flow sent to the test and blocks mixture. Lasts for 120 seconds and then resets.

Question 31

Where can you find abnormal/emergency operation guidance for gas cooled loops?

Answer 31

In the EOILs

Question 32

Required actions for loss of ups or comm electrical power?

Answer 32

No immediate actions capsule gas supply and temp control remain operational in automatic. Place all capsules in PURGE For ups - monitor from 1B For comm - monitor from LCA

Question 33

Response to loss of diesel/comm power?

Answer 33

Capsule gas supply and temp control in 1B cubicle fail to full helium flow. Control and monitoring available from LCA LCA op station 2 OOS Place all capsules in PURGE