Digital rod position indication

Question 1

Power supply for DRPI is ______. If fails, a backup can be selected with a switch located _____.

Answer 1

134V1 and 133X1

426’ penetration area

Question 2

Note that the ____ two coils are always penetrated and the ____two coils are never expected to be penetrated

Answer 2

bottom
top

Question 3

Error in data A condition______
Error in data B condition______

Answer 3

+10, -4 steps

-10, +4 steps

Question 4

Shutdown bank rods have a transition area between ____ and _____ steps. ____ is lit.

Answer 4

18-210 steps
Transition zone LED

Question 5

Data cabinets A and B are located in the ______.

Answer 5

Containment Building

Question 6

____ to ____ steps when Data ____ is the only good cabinet.

Answer 6

+10 to -4 steps
Data cabinet B
10-4 buddy

Question 7

Causes of Rod Dev Pwr range tilt alarm: (4)

Answer 7

-2 % radial tilt or >=25% axial tilt (NIs)
-Demand >ARO, sequence or overlap >1 step deviation, CBD >223 steps
-> 12 Steps Dev w/in a bank, SD Rod < 225 (DRPI) when that bank > 227 (Demand
-DRPI Vs. Demand > 12 steps (computer)

Question 8

Rod at bottom alarm will come in when _____ control bank rod bottom light lit or ______ control bank _____ light is lit.

Answer 8

preceding
Current rod bottom light is lit

Question 9

Rod bottom alarm will come in when any control bank is ____ steps and a ______ comes in.

Answer 9

> =12 steps
Rod bottom light within that group comes in

Question 10

There are ____ central control cards. If a central control card disagrees with the other 2, ______.

Answer 10

3
Automatically kicks out and does not affect system operation

Question 11

Ejected rod indications

Answer 11

Ejected Rod Indications
-DRPI (Data A and Data B) Urgent
-Rod Control Urgent Annunciator .
-General Warning (Affected Rod)
-Rod Bottom Light (Affected Rod)
-Rod Deviation Power Range Tilt Annunciator
-Possible Power Spike from Positive Reactivity
-Pressurizer Pressure Dropping
-Pzr Level Dropping
-Rise in Charging Flow

Question 12

The _____ two coils are always penetrated and the ____ two coils are never penetrated.

Answer 12

Bottom
Top

Question 13

Group step counters are reset to zero by operating the _____.

Answer 13

Rod control startup switch

Question 14

General warning alarm causes

Answer 14

4. General Warning
   A General Warning Alarm will be accompanied by other alarms
   a. Alarm flashes when:
   1) A and/or B data for any rod is defective
   2) Urgent Failure Alarm is present

Question 15

LCO 3.1.4 Rod alignment

Answer 15

All shutdown and control rods shall be OPERABLE.
AND
Individual indicated rod positions shall be within 12 steps
of their group step counter demand position.

Question 16

LCO 3.1.7 rod position indication

Answer 16

The Digital Rod Position Indication (DRPI) System and the
Demand Position Indication System shall be OPERABLE.

Question 17

If a rod in a control bank drops prior to a rod reaching ____, the rod bottom alarm WILL NOT actuate until the first rod reaches ______.

Answer 17

12 steps
>=12 steps

Question 18

The only DRPI alarm that inputs to rod control urgent failure is the ______.

Answer 18

DRPI urgent failure