Detectors

Question 1

What do Instrument Power Fuses supply?

Answer 1

Instrument power supplies

Question 2

What to Control power fuses do for NIs?

Answer 2

Bistables

Question 3

How do Source Range Detectors work?

Answer 3

BF3 Proportional Counters

Question 4

How do IR Detectors work?

Answer 4

Compensated Ion Chamber

Question 5

How do PR Detectors work?

Answer 5

Uncompensated Ion Chambers

Question 6

How do gammametrics work?

Answer 6

Fission Chamber (U235)

Question 7

What powers NIs?

Answer 7

Own unit’s CRID which matches the 2nd number of the detector. Ex: Power Range N-41 = CRID 1

Question 8

What powers SR N-23?

Answer 8

Opposite Unit CRID 3

Question 9

What powers IR N-35?

Answer 9

CRID 1

Question 10

What powers IR N-36?

Answer 10

CRID 2

Question 11

What does an Overcompensation of IRNI do?

Answer 11

Gives a false low indication

Question 12

What does unercompensation of the IRNI output do?

Answer 12

Gives a false High Indication

Question 13

What happens to P-6 if you’re overcompensated?

Answer 13

Can cause IR current to decrease below P6 setpoint earlier than normal and cause SR detectors to energize at higher than normal flux level. Going up, P-6 bistable may become active later than it should.

Question 14

What happens to P-6 if you’re undercompensated?

Answer 14

Can cause IR current to stay above P6 setpoint, preventing SR detectors from auto energizing.

Question 15

What is Overlap for NIs?

Answer 15

IRs allow blocking SRs at E-10 amps

Question 16

What is lower flux deviation?

Answer 16

Alarms when power <50% OR a lower detector +/- 2% from the AVG of others

Question 17

What is PR Flux Deviation?

Answer 17

PRNI Channel +/- 3% from any other

Question 18

What’s the purpose of Incore NIs?

Answer 18

Identify misaligned rods

Determines magnitud / location of fuel burnup

Question 19

What speed do the Incore Drive Units move in SLOW?

Answer 19

12 ft/min while scanning core

Question 20

What speed do Incore Drive Units move in FAST?

Answer 20

72 ft/min from withdrawn to bottom of core

Question 21

For Incore NIs, what does the Safety Limit Switch do?

Answer 21

De-Energizes drive motor

Question 22

What are the positions of the 5 Path Transfer Device Switch?

Answer 22

1. Normal
2. Calibrate (J10)
3. Emergency (next 10 path)
4. Common (C ten path)
5. Storage
6. OFF (normal position and Drive Gear Deactivated)

Question 23

Where is a leak sensed on the 10 Path Transfer Device?

Answer 23

Pressure switch which alarms control room

Question 24

For Incore INs, what is the RCS Leakage Boundary?

Answer 24

Guide Tubes (wet inside)

Question 25

Where does the common path go for the 5 path transfer device?

Answer 25

To the C 10 Path

Question 26

Where does the storage path go for the 5 path transfer device?

Answer 26

Concrete Storage Area