Movable Incore Detector System

Question 1

Purpose of incore detectors (8)

Answer 1

• Confirm proper fuel loading
• Calc hot channel factors
• Compute fuel burnup profiles
• Calibrate power range detectors
• Monitor QPTR
• Verify control rod misalignment
• Compute extent of fuel damage
• Calibrate PDMS

Question 2

Purpose of safety limit switch

Answer 2

Prevents detector from entering the drive unit

Question 3

Purpose of the withdrawn limit switch

Answer 3

• Stops auto rod withdrawal

- Disallows 5 and 10 path movement

Question 4

Slow speed is _____ft/min and fast is _____ft/min.

Answer 4

12; 72

Question 5

If a RCS leak occurs in the seal table room, ______ will alarm. There is also an audible alarm w/ light on the front of the _____ to warn of a leak.

Answer 5

_AR03J will alarm

MID panel

Question 6

TLCO 3.3.a The Movable Incore Detection System shall be OPERABLE with:

Answer 6

1. ≥ 75% of the detector thimbles,
2. ≥ 2 detector thimbles per core quadrant, and
3. Sufficient movable detectors, drive, and readout
   equipment to map these thimbles.
   ————————–NOTES ————————–
   Only ≥ 50% of the detector thimbles are required for Power
   Distribution Monitoring System (PDMS) calibrations after the
   initial PDMS calibration following each refueling.
   ———————————————————-

Question 7

The ________ energizes the withdraw position lamp on the panel.

Answer 7

Withdraw limit switch

Question 8

5 path has 1 inlet and 5 outlet paths which are:

Answer 8

Normal
Calibrate
Emergency
Common
Storage

Question 9

Function of the Insert button?

Answer 9

Inserts MIDS from withdrawn to bottom of core @72 ft/min

Question 10

Function of the scan button?

Answer 10

Moves MIDS from bottom to top of core @12 ft/min

Question 11

Function of the record button?

Answer 11

Moves MIDS from top to bottom of the core @ 12 ft/min

Question 12

Function of the withdraw button?

Answer 12

Withdraws MIDs from bottom of the core to withdrawn @72 ft/min

Question 13

When the Movable Incore Detection System is used for:

4 reasons

Answer 13

1. Recalibration of the Excore Neutron Flux Detection
   System,
2. Calibration of the PDMS,
3. Monitoring normalized symmetric power distribution, or
4. Measurement of N F∆H ,FC
   Q(Z), and FW
   Q(Z).

Question 14

Order of components starting at drive units

Answer 14

Drive unit to the limit switches to the 5 path to the 10 path to the guillotine valves to the seal table to the bottom of the core through the thimble tubes for flux mapping.