Reactor Manual Control System - 1.0

Question 1

What occurs as a result of the Bypassed Rod Interlock?

Answer 1

1. Not tested and cannot be moved by the RMCS system.
2. When a specific transponder is placed in BYPASS at the RDCC, it will stop both the SCAN and Self test functions of the analyzer card.

Question 2

What causes an Activity Controls Disagree Interlock and what actions/indications does it actuate?

Answer 2

Causes:
1. Thinks that <1 or >1 rod is selected.*

Actions:
2. 120VAC removed from BJM
3. Inhibits motion on all rods. (No “Rod Block” lights illuminate.)
4. RMCS INOP OHA.
5. Alarm light located on RMCS.
*Illuminates whenever outputs from both activity control (transmitter) cards are not identical. If transmitter cards are not identical, the Rod Select P.B. will only have 1 of the 2 lights illuminated.

Question 3

When does the RDCC Activity Control Card inhibit rod motion?

Answer 3

Prevents rod motion if:
- RWM program not ready
- RWM computer failure
- RWM requests a rod block
- Most other rod block signals (look in system lesson plan)

Question 4

Data Fault.

Answer 4

System sees more than one even reed switch closed on a single rod. (XX on four rod display.)

Question 5

What is the indication of rod drift?

Answer 5

Occurs if an odd reed switch is closed w/ no rod motion signal present.

Question 6

Single Rod Insert Signal Times.

Answer 6

• Insert rod for 2.94 sec
• Settle function 5.9 sec
• Continuous insert bypasses settle function.

Question 7

Single Rod Withdrawal Signal times.

Answer 7

• Insert for .64 sec
• Withdraw for 1.5 sec
• Settle function 6 sec

Question 8

Rod Disagreement

Answer 8

Analyzer card sees more than one rod selected.

Question 9

What occurs when Rod Disagreement is present?

Answer 9

1. Rod motion inhibited.
2. 120 VAC power to BJM’s removed.
3. Reactor Control System inoperative alarm.

Question 10

Describe the SCAN function performed by the Analyzer (SCANALYZER)

Answer 10

This function updates the CR on the status of the HCU (alarms, etc.).

Question 11

What systems make up RMCS and what are their functions?

Answer 11

• Rod Drive Control: Movement signals.
• RPIS: Position indication.
• RWM: Enforces CR patterns.

Question 12

Loss of AD 483.

Answer 12

No RPIS for position indication.

Question 13

Channel Distortion.

Answer 13

Slow to settle - 2 seconds from settle light going out to indication on the 4 rod display.

Question 14

What causes a blank 4 rod display indication?

Answer 14

• Rod overtravel.
• Rod motion.
• Failed reed switch.