Power range nuclear instruments

Question 1

The PR NIs utilize what type of detector?

Answer 1

Uncompensated ion chamber

Question 2

Which radiation detectors operate in the Ionization region?

Answer 2

SR, IR, and PR
MIDS
VCT cubicle and CNTMT high range monitors

Question 3

Detector current comparator drawer is powered from ______. Loss of power defeats the ________ switches.
The ________ switches are unaffected by the loss of power and are still functional.

Answer 3

AC bus 114

Upper and Lower section defeat switches

Rod stop and power mismatch switches are unaffected.

Question 4

To calculate delta I, _____- _____.

Answer 4

Upper minus lower

Question 5

If instrument power is lost, the lights on the PR drawer will ______ and if control power is lost, the lights will _____.

Answer 5

Remain lit

Go dark

Question 6

What is the function of the Rate mode selects switch?

Answer 6

Resets the positive rate trip. >5% in <=2 seconds

Question 7

What is the function of the power mismatch bypass switch?

Answer 7

Removes the selected channel from the rod drive and U2 SG level circuitry.

Question 8

What is the function of the Rod stop bypass switch?

Answer 8

Removes the selected channel from the rod stop circuitry and generates alarm.

Question 9

What is the function of the channel comparator defeat switch?

Answer 9

Defeats the 3% deviation alarm function by taking a channel out of the comparator circuitry.

Question 10

PR uncompensated ion chamber can has an inner coating of ____.

Answer 10

Boron-10

Question 11

Comparator and rate drawer is powered from ______. Loss of power to this drawer disables the _______ and it will not function.

Answer 11

AC bus 113

Comparator channel defeat switch

Question 12

P6 is the _____
Inputs_____
Purpose_____
Automatic actions_____

Answer 12

SR permissive

1/2 IR channels>1.0E-5%, Resets 2/2 <5E-6%

Allows manual block of SR high flux trip

Automatically unblocks SR high flux trip below P-6

Question 13

P7 is the _____
Inputs_____
Purpose_____
Automatic actions_____

Answer 13

Low power permissive

1/2 P-10 or P-13, Resets both P10and P13 clear

Unblocks 6 reactor trips above P7
2/4 RCS flow, RCP bus UF, RCP bus UV, PZR low pressure, PZR high level, 2/4 RCP breakers open

No auto actions

Question 14

P8 is the _____
Inputs_____
Purpose_____
Automatic actions_____

Answer 14

Low flow/turbine trip permissive

2/4 PR ch. >30%
3/4 <=30% reset

Unblocks 2 reactor trips when above P8
1. 1/4 RCS low flow
2. Turbine trip

No auto actions

Question 15

P10 is the _____
Inputs_____
Purpose_____
Automatic actions_____

Answer 15

At-power permissive

2/4 PR channels >10%, resets 3/4 PR<10%

Blocks SR high flux trip
Inputs to P7
Allows manual block of both IR and PR low flux trip

Automatically blocks SR high flux trip

Question 16

How many PR NIs need to indicate AFD outside limits for LCO 3.2.3?

Answer 16

The AFD shall be maintained within the limits specified in
the COLR.
—————————-NOTE—————————-
The AFD shall be considered outside limits when two or more
OPERABLE excore channels indicate AFD to be outside limits.
————————————————————

30 minutes to reduce power <50%

Question 17

IF the P-8 and P-10 lights are lit on the NI panels, the lights will be ______ on the bypass permissive panel.

Answer 17

OFF