Start-up Annunciators

Question 1

What will cause the SR or IR Level Trip Bypass alarm, Annunciator 110 (210) drop 1?

Answer 1

Operator takes level trip bypass switch on the drawer to bypass. (Allows instrument fuse removal)

Question 2

What will cause the SR Hi Flux at Shutdown alarm? Annunciator 110 (210) Drop 3

Answer 2

With it set properly (3x stable shutdown count rate or 1/2 decade above background) any increase to that set point will cause the alarm.

Question 3

What else will happen if you receive the SR Hi flux at Shutdown alarm?

Answer 3

Containment evacuation alarm will sound

Question 4

What will cause the SR Hi Flux at shutdown alarm blocked alarm? Annunciator 110 (210) Drop 4

Answer 4

Startup procedure requires operator to place the block switches in the blocked position, causing the alarm.

Question 5

What will cause the PR Upper Detector Flux Deviation alarm? Annunciator 110 (210) drop 16

Answer 5

It will be standing during startup bc all PR detectors are below 50% power.

Above 50% power, +/- 2% deviation from the avg of all upper detectors will bring it in.

Question 6

What is the probable cause of a PR upper detector flux deviation alarm?

Answer 6

Rod mis-alignment

Question 7

What is the cause of the PR Lower detector flux deviation alarm? Annunciator 110 (210) Drop 17

Answer 7

Probably cause is rod mis-alignment.

Standing at startup below 50% power

Question 8

When will The Rod Dropped or Rod Bottom alarm clear? Annunciator 110 (210) Drop 22

Answer 8

Clears with withdrawal of control bank “A” at 20 steals as indicated by IRPI.

Question 9

What does the Rod Dropped or Rod Bottom alarm tell us?

Answer 9

If any SD Banks or CB A drops to less than 20 steps.

Or for CB B, C, D, it is armed after their banks are above 35 steps as indicated by the P/A. It will then tell you if a rod drops below 20 steps.

Question 10

What causes the Rod Sequence Violation alarm? Annunciator 110 (210) Drop 29

Answer 10

Alarm will be standing during startup.

Question 11

What must we do during startup because of the Standing Rod Sequence Violation alarm?

Answer 11

Record individual rod IRPI Positions as compared to demand during startup

Question 12

When does the Rod Bank A Low Low alarm Clear? Annunciator 110 (210) Drop 36

Answer 12

When Control Bank A gets to 215 steps as indicated by bank position

Question 13

When does the Rod Bank A Low alarm clear? Annunciator 110 (210) Drop 31

Answer 13

When Control Bank A gets to 225 steals as indicated by bank position

Question 14

When does Rod Bank B Low Low alarm Clear? Annunciator 110 (210) Drop 37

Answer 14

When Control Bank B gets to 215 Steps

Question 15

When does Rod Bank B Low Alarm Clear? Annunciator 110 (210) Drop 32

Answer 15

When Control Bank B gets to 225 steps as indicated by bank position

Question 16

When does Rod Bank C Low Low alarm clear? Annunciator 110 (210) Drop 38

Answer 16

When control bank C gets to 128 steps

Question 17

When does the Rod Bank C Low alarm Clear? Annunciator 110 (210) Drop 33

Answer 17

When Control Bank C is at 138 Steps

Question 18

When Does Rod Bank D Low Low alarm Clear? Annunciator 110 (210) Drop 39

Answer 18

At 0 Steps on control bank D

At the same time control bank C clears

Question 19

When does the Rod Bank D Low alarm clear? Annunciator 110 (210) Drop 34

Answer 19

When Control Bank D is at 10 steps

Clears at the same time as Rod Bank C Low)

Question 20

Why is the Reactor Delta Flux Deviation alarm standing during startup and what does it do? Annunciator 110 (210) Drop 44

Answer 20

Alarm is standing bc power is < 15%

Alarm monitors AFD

Question 21

When would the Loops 1,2,3,4 Tavg Low alarm clear during startup? Annunciator 111 (211) Drop 1

Answer 21

Should not clear unless temp gets above 554*F