C5104 - APRMs

Question 1

How much difference is acceptable between APRM channels?

Answer 1

< 2% while at > 21.8% power

Question 2

what should be done if the scram range is entered on the power/map?

Answer 2

If OPRM is operable, exit promptly.

If OPRM is not operable, SCRAM

Question 3

What should be done if the controlled area is entered on the Power/Flow map?

Answer 3

1. if unplanned, exit promptly

2. if planned, Fraction of core boiling boundary must be verified to be < 1.0

Question 4

What happens if 1 APRM channel is bypassed?

Answer 4

Logic goes to 2 out of 3

Question 5

What happens if 1 APRM channel is INOP?

Answer 5

Logic goes to 1 out of 3

Question 6

What is the purpose of APRM?

Answer 6

Primary indication of neutron flux up to 125% Rx power and responds immediately to flux increases

Question 7

What voters go to what RPS logic?

Answer 7

Voters 1 and 3 go to RPS A and C

Voters 2 and 4 go to RPS B and D

Question 8

How many APRMs can be bypassed at one time?

Answer 8

1

Question 9

what is the voter logic for APRM?

Answer 9

2 out of 4 of the SAME signal

Question 10

What causes an APRM to INOP?

Answer 10

SOO - switch out of operate
Critical Self-test fault
Watchdog timer timed out
Loss of input power

Question 11

How do you get a half scram on APRM?

Answer 11

Loss of power to a single APRM channel.

All others, would just give you a half trip

Question 12

When is the OPRM armed?

Answer 12

> 21.8% power and < 75% flow

Question 13

What is the formula to calculate APRM GAF

Answer 13

APRM gain adjustment factor (GAF)
AGAF = ATP/RTP/ APRM meter reading/ 100%

OR***

AGAF = actual/indicated

Question 14

what is a non-conservative GAF?

Answer 14

> 1.0

Question 15

What is tech spec GAF required to be?

Answer 15

within +/- .02 (2%)

Question 16

What are the APRM rod block signals? (and bypassed)

Answer 16

UU DULI (bypassed goes in parentheses)

Upscale neutron > 12% (RUN)
Upscale thermal 0.64Wd + 56.8% (cap @108%) (NEVER)
0.64Wd + 28% (single loop)
Downscale <5% (not in RUN)
Upscale flow > 111% total recirc flow (Not in RUN)
LPRMs per APRM <21 total; < 3 per level (NEVER)
INOP (NEVER)

Question 17

What are the APRM SCRAM signals (and bypassed)

Answer 17

UUU OI NO HALF SCRAMS FROM SIGNALS

Upscale neutron >18% (RUN)
Upscale neutron > 117.3% (not in RUN)
Upscale thermal 0.64Wd + 59.8% (cap @ 111%) (NEVER)
0.64Wd + 31% (single loop)

OPRMs (DIDA or CDA) (outside enable region, >21.8%
power < 75% flow)
INOP (NEVER)