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21 Cards in this Set
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- Back
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Question 1: What is the function of the DRPI System?
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Answer 1: monitor each individual control rod position to ensure rods are maintain within ? 12 steps to meet Technical Specification requirements. Accuracy is normally within ?4 steps. Information is displayed on Main Control Board.
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Question 1. When comparing the DRPI for shutdown rods to those of control rods, what is the most significant difference?
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Answer 1. Shutdown rods have 20 coils each while control rods have 42 coils each.
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Question 2. What is "inductive reactance" and how is it used to determine control rod position?
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Answer 2. AC power is applied to coils. Electromagnetic flux generated by coils penetrates housing. Drive shaft is ferromagnetic so flux concentrates where shaft penetrates coil. The concentration of flux improves inductance of coil, increasing coil's impedance (resistance to current flow). The change in coil impedance is measured to determine rod position.
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Question 3. Why do we use two data channels?
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Answer 3. Increases system reliability by preventing a total loss of position information if a single component fails.
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Question 4. What is so unique about the "gray code?"
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Answer 4. Only one digit changes as the coils are counted.
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Question 5. Why are there three "central control cards" in the control board display unit?
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Answer 5. Increased reliability. The three cards use a "majority vote" to identify card failure.
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Question 6. What is the power supply to the DRPI system?
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Answer 6. PN07
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Question 7. From where does PN07 receive power?
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Answer 7. NG01B (NORMAL) PG19G (backup)
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Question 1. What will cause a "Rod Deviation Alarm?"
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Answer 1. 1. Any shutdown bank rod < 210 steps with any control bank rod greater than zero 2. Any two rods in a control bank differing by > 12 steps
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Question 2. Both data trains have failed resulting in a RPI urgent failure. What indication should be present of the control board display unit?
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Answer 2. 1. Rod deviation LEDs lit 2. Urgent alarm LEDs lit 3. Data A failure LEDs lit 4. Data B failure LEDs lit 5. General warning LEDs lit 6. Rod bottom LEDs lit
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Question 3. The control board display unit is indicating a rod deviation. The "1" and "R" LEDs are lit but the "2" LED is not. What does this indicate?
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Answer 3. The first rod deviation card is sensing a rod deviation while the second rod deviation card is not.
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Question 4. Generally speaking, each row of the control board display unit represents how many control rod steps?
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6
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Question 5. What shutdown rod position indications display on the control board display unit?
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Answer 5. 228 steps, 210 steps, transition, 18 steps, rod bottom
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Question 1. Assuming a loss of "A" data, what is the accuracy of the DRPI system?
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Answer 1. +10/-4 steps
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Question 2. What warnings are provided to the operator to inform him that the DRPI is operating at half-accuracy?
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Answer 2. 1. "GW" (General Warning) LED above affected rod 2. "A" or "B" data failure LEDs 3. RPI non-urgent alarm on the MCB
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Question 1. What is the function of the bank demand indication system?
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Answer 1. Provide indication of rod group position with +1 step accuracy and display this information to control room operators.
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Question 2. By what common name is the bank demand indication system called?
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Answer 2. Step counters
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Question 3. (T/F) Step counters always accurately reflect the actual position of a rod?
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Answer 3. False
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Question 1. Which of the following statements is true when comparing the bank demand indication system to the DRPI system? A. The bank demand indication system is more accurate and more reliable than the DRPI system. B. The bank demand indication system is less accurate and less reliable than the DRPI system. C. The bank demand indication system is more accurate but less reliable than the DRPI system. D. The bank demand indication system is less accurate but more reliable than the DRPI system.
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Answer 1. C. The bank demand indication system is more accurate but less reliable than the DRPI system.
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Question 1. What is the function of the rod insertion monitor?
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Answer 1. Alerts operator when plant condition is approaching or exceeding insertion limit for control bank rods.
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Question 2. Which of the following parameters are utilized for the rod insertion monitor? A. Auctioneered high TAVG and DRPI control rod position B. Auctioneered low TAVG and DRPI control rod position C. Auctioneered low RCS DT and P/A converter output D. Auctioneered high RCS DT and P/A converter output
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Answer 2. D. Auctioneered high RCS DT and P/A converter output
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