CPCs And CEACs

Question 1

What conditions will generate a CWP?

CC LoLo HR

Answer 1

• CPC pre-penalty sequence
• CEA deviation
• Lo DNBR pre-trip
• Lo Pressurizer pressure pre-trip
• Hi LPD pre-trip
• RPCB demand

Question 2

What is the function of the CEACs?

Answer 2

Only the CEACs can detect a deviation between CEAs in a subgroup

Monitored by RSPTs

Question 3

When does a CPC shift from using a canned value to an actual value of ASI?

Answer 3

• When you are raising power and the sum of the three excore NI detectors reaches 51%
• When you are lowering power and the sum of the three excore NI detectors reaches 45%

Question 4

What are the outputs of the CPCs?

Answer 4

• Low DNBR trips/pre-trips
• Hi LPD trips/pre-trips
• Calibrated neutron flux power
• CWP