RPI

Question 1

State the T.S. allowable Rod Deviation

Answer 1

12 steps, T.S. 3.1.3.1

Question 2

State the accuracy of DRPI

Answer 2

+/- 4 steps. This accuracy changes when either A or B data cabinet component fails

Question 3

State what gives a Rod Deviation alarm

Answer 3

Any shutdown rod ≤ 210 steps or
Any two rods in the same control bank ≥ 12 steps apart
Signals the system rod deviation alarm (1,R,2) and D7753

Question 4

State T.S. 3.1.3.1 (Group Height) LCO and Action

Answer 4

All full-length shutdown and control rods shall be OPERABLE and positioned within +/-12 steps of their group step counter demand position
MODE:1 and 2
A: With one or more full-length rods inoperable because of being immovable as a result of excessive friction or mechanical interference or known to be untriplable, determine that the SHUTDOWN MARGIN is within the limits specified in the COLR within 1 hour and be in HOT STANDBY within 6 hours

Question 5

State what gives Central Control Failure

Answer 5

Lit to indicate CCC disagrees with both of the other two CCCs and been automatically disconnected from the system

Question 6

State what gives Urgent Alarm

Answer 6

Flashing to indicate at least one rod position is unknown. Affected rod(s) indicated by GW and Rod Bottom position

Question 7

State what gives Data A/B failure

Answer 7

Flashing to indicate that the “A/B” position information is invalid for at least one rod. Affected Rod(s) indicated by GW.

Question 8

State what gives general warning alarm

Answer 8

Flashing to indicate affected rod with DATA A/B FAILURE, or URGENT ALARM