CPC Flashcards
Which ONE of the following states how the CPC calculated value of LPD would change if a dilution was started as rods were inserted into the core? LPD would…
A. decrease and margin will initially remain constant and then decrease.
B. decrease and LPD margin will increase.
C. remain the same and margin will remain constant.
D. increase and LPD margin will decrease.
Answer: D
Which of the following describes the operational bypass associated with the Core Protection Calculator trips? These trips are automatically…
A. bypassed when power drops to 1E-4%.
B. bypassed when power drops to 1E-2%.
C. placed in service when power increases to 1E-4%.
D. placed in service when power increases to 1E-2%.
Answer: C
Given the following plant conditions: Unit 1 is operating at rated power. Subgroup 5 has been transferred to the hold bus. The ‘B’ Main Feed Pump trips. Which of the following describe the plant response?
A. A RPCB will initiate with group four providing sufficient negative reactivity to offset the reduction of feedwater.
B. A normal RPCB will be initiated.
C. The reactor will trip if group 5 is not inserted manually within 40 seconds following the RPCB signal.
D. The reactor will trip immediately.
Answer: D
Given the following plant conditions: A twelve finger CEA in Regulating Group 3 slips from 150” to 88” withdrawn. All other CEAs are ARO. Unit is at 100% power. What is the affect of this dropped rod on CPCs and CEACs?
A. All four CPCs will immediately trip on LPD and DNBR due to an out of sequence condition.
B. No CPCs will trip. CEACs will send a small penalty factor to all CPCs.
C. One CPC will immediately trip on LPD and DNBR. CEACs will send a penalty factor to the other CPCs.
D. One CPC will immediately trip on LPD and DNBR. CEACs will send no penalty factor to the other CPC’s.
Answer: C
Since rod position information is fed to the CPCs, why are the CEACs still necessary? Only the…
A. CEACs are capable of detecting smaller deviations to give quicker protection.
B. CPCs are used for protection, while the CEACs are used to monitor LCOs.
C. CEACs are capable of detecting a deviation between CEAs in a subgroup.
D. CPCs have demanded position information (pulse counters), but CEACs have actual position information (RSPTs).
Answer: C
In the upgraded CPCs (Advant) which one of the following describes how the “A” CPC determines where its “Target CEAs” are located? CEA position information is provided by:
A. RSPT-2 to CPP-1A to CEAC-2A to CPC A
B. RSPT-1 to CPP-1A to CEAC-2A to CPC A
C. RSPT-2 to CPP-1A to CEAC-1A to CPC A
D. RSPT-1 to CPP-1A to CEAC-1A to CPC A
Answer: D
In the upgraded CPC System (Advant), the CEAC penalty factors are generated based on…
A. Partstrength insertion limits.
B. CEA misalignment within a subgroup.
C. Reg Groups out of sequence.
D. Subgroup deviations within a group.
Answer: B
Considering the upgraded CPC System (Advant), what information does CEAC 1A supply to the CPC “A”?
A. 22 target CEA positions and Penalty Factors based on subgroup deviations within a group.
B. 22 target CEA positions and Penalty Factors based on CEA misalignment within a subgroup.
C. 89 target CEA positions and Penalty Factors based on subgroup deviations within a group.
D. 89 target CEA positions and Penalty Factors based on CEA misalignment within a subgroup.
Answer: B
