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INTEGRATED CONTROL SYSTEM (ICS) Flashcards

(48 cards)

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1
Q

What initiates mini-track in ICS?

A

Placing BOTH the Rx Demand and Diamond Stations in HAND.

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2
Q

What happens when SG/Rx Master is in HAND?

A

The turbine responds to changing load using unmodified header pressure error.

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3
Q

What does hitting the reset SASS button do?

A

It defeats the alarm until the green light flashes.

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4
Q

What are the characteristics of SG/Rx Following Mode?

A

Rapid, immediate MW response but poor RCS pressure/Tave/OTSG pressure control.

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5
Q

What are the characteristics of Turbine Following Mode?

A

Good stability, delayed MW response.

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6
Q

What are the characteristics of Integrated Mode?

A

Limited but immediate MWe response, good stability.

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7
Q

What causes SG/Rx Master to go to HAND?

A

A failure of STAR or loss of power (ATA).

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8
Q

What are the AUTO permissives for ULD?

A

Valid PPC data, sums matching STAR module sums, Thermal Power ± 0.7% of CTP setpoint.

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9
Q

What triggers AUTO to HAND for ULD?

A

CTP PPC inputs all 0, CTP > 102%, CTP Error >0.7% (3 consecutive times), no valid PPC for 90 sec, 3 consecutive check sums fail, 7 consecutive identical PPC inputs, or when Tracking or HLL/LLL clears.

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10
Q

What is the priority order for ULD signals?

A

(1) HLL, (2) Tracking, (3) LLL, (4) Operator Input.

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11
Q

What happens in AUTO mode for the Integrated Master?

A

MWerror from ULD demand vs. actual MW modifies THP setpoint (885#), which generates THP error and sends it to DTCS.

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12
Q

What happens in HAND mode for the Integrated Master?

A

Operator sets load set on Turbine H/A station, which generates THP error signal and sends it to DTCS.

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13
Q

What blocks MW Calibrating Integral?

A

R.o.C. >2%/min for 10 sec, TRACKING (except TB in HAND).

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14
Q

What bleeds MW Calibrating Integral?

A

Both OTSGs on LLL, Rx Demand @ minimum, or tracking (except TB or SG/Rx Master in HAND).

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15
Q

When does FW take control of TAVE?

A

If Rx Demand or Diamond is in HAND.

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16
Q

What blocks Delta Tc Calibrating Integral?

A

R.o.C., RC flow error >10%.

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17
Q

What happens if FW-V-16/17 are in HAND?

A

Return the controlling valve to AUTO first. If BOTH are controlling (~25%), return FW-V-17 to AUTO first.

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18
Q

What blocks Rx Tave Calibrating Integral?

A

R.o.C., Diamond in AUTO + Neutron Demand Limited, or both OTSGs on LLL + Tave Low.

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19
Q

What are the inputs for Rx Tave Calibrating Integral?

A

Neutron error if Diamond in HAND, Tave error if in AUTO, and Error across H/A station when Rx Demand in HAND.

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20
Q

What is the Low Neutron Demand Limit?

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A

Rx Power @ 18.5% with High Tave allows rod movement to correct TAVE.

21
Q

What is the High Neutron Demand Limit?

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A

Prevents control system from hitting RPS setpoint.

22
Q

What happens to Pzr Heaters on loss of ICS AUTO?

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A

Heaters fail OFF due to low level interlock.

23
Q

What happens to Pzr Heaters on loss of ICS HAND?

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A

Banks 1-3 fail to 50%.

24
Q

What must be done before placing Diamond in AUTO?

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A

Diamond must be in SEQUENCE.

25
What controls ADV/TBV?
OTSG pressure, not turbine header pressure.
26
What happens if FW loop temp fails high?
Feedwater demand increases to remove the same amount of energy.
27
What happens on a reactor trip?
ICS runback @ 20%/min (track), 100% neutron error develops, and neutron cross-limits drive a 95% reduction in FW demand instantaneously.
28
What happens if TAVE fails higher?
Rods will insert.
29
What happens if TAVE Setpoint fails higher?
Rods will pull to try to maintain the higher value.
30
What happens on RCP trip?
FW re-ratioing maintains higher level in the OTSG with 2 pumps.
31
What happens if FW-V-17 is in HAND and ICS hand power is lost <75% power?
Trip the reactor due to overcooling.
32
What happens when Turbine Stop Valve #1 fails closed?
Less heat is removed from “A” OTSG, positive ΔTC builds, and power is reduced to 90%.
33
What is the operator's action when TAVE fails LOW?
Place Diamond and Rx Demand in HAND, which causes FW demand to go DOWN due to FW TAVE control tieback.
34
How do BTU limits affect feedwater control?
BTU limits affect both feedwater pumps and the affected OTSG’s FW valves.
35
What is the role of the kicker circuit?
The kicker circuit raises or lowers demand to FW/Rx stations.
36
What do the red and white lights indicate?
- ULD: TRACK - Turbine: Mini-Track, Mark V Limiting/TB to Local - Rx Demand Station: Both Rx Demand and Diamond in HAND
37
What happens during a 100% Power FWP Trip?
- ULD H/A Station is HLL (both lights ON). - High Load Limit to 68% (560 MW) @ 50%/min. - FW to Rx Cross-Limits lowers Reactor since actual flow is much less than demand. - FW Valve dP goes DOWN, boosting signal to remaining FWP to speed UP.
38
What is the operator's action for high vibrations on RC-P-1C at 100% power?
Go to HAND on ULD, adjust R.o.C. to 5%/min, and dial back to <665 MW.
39
What happens when RC-P-1C trips during a runback at 90% power?
Runback to 455 MWe @ 30%/min for the dropped control rod (lowest HLL at its assigned rate).
40
What is the sequence of events during a Reactor Trip from 100% Power?
- Runback initiated in TRACK at 20%/min. - Rx-to-FW cross-limits reduce FW flow. - BTU limits take over control from cross-limits when hit. - Low Level Limits maintain minimum OTSG level.
41
What is the mitigation for Selected Turbine Header Pressure failing LOW at 100% power?
Take turbine to HAND and SG/Rx Master to HAND to manage the kicker circuit's positive demand signal.
42
What is the key takeaway when MW Generated fails LOW?
Take BOTH Turbine and SG/Rx Master to HAND to manage header pressure and FW/Rx demand.
43
What happens when NI-5 fails LOW slowly at 100% power with no SASS?
Indicated Rx power is LOWER than Rx Demand, Rx to FW cross-limits drag down FW, and rods pull due to large neutron error.
44
What happens when Selected THOT fails LOW with no SASS?
BTU limit actuates on BOTH OTSGs, and the low selector sends a lower signal to all FW valves and FWPs.
45
What happens when TAVE goes LOW? .
Rods are going to pull
46
What is the response when TAVE goes LOW?
Place all pumps and valves in HAND, and place Rx Demand and Diamond in HAND.
47
What happens when Loop A RCS fails LOW?
Loop B tries raising FW flow, Loop A tries lowering FW flow (re-ratioing).
48
What action is taken when BTU limits are hit on the "A" side?
Put "A" side in HAND (BTU), both FWPs in HAND, and Loop B FW Masters.

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