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SRO > Control > Flashcards

Control Flashcards

1
Q

Where does loop-specific Tavg go?

A

OPDT
OTDT
Low Tavg (FW isolation at 2/4 < 564 and P4)
Low-low Tavg, i.e., P12 (550 on 2/4)

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2
Q

What is Low Tavg?

A

Tavg < 564 on 2/4 and P4 (trip)
Causes FW isolation

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3
Q

What is low-low Tavg?
Purpose?
Another name?

A

a.k.a P12
2/4 Tavg < 550
Blocks steam dumps
Prevents excessive cool

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4
Q

What uses auctioneered high Tavg?

A

PZR level control
Rod control
Steam dumps

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5
Q

PZR level control program

A

25% -> 61.5% as auctioneered Tavg goes from THZP to THFP
It stays constant above/below those Tavgs

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6
Q

PZR response to a continuous P increase

A

Heaters off
Sprays on
PORVS hit
Trip
Safeties hit

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7
Q

PZR response to continuous P decrease

A

Heaters on
Close PORVs
Trip (low PZR P, OTDT)
SIS

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8
Q

What measures FW flow for control?

A

Venturi

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9
Q

What signals feed rod control?

A

Tref from Pimp
Auctioneered high Tavg
Pturb from impulse P
Auctioneered high PR power

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10
Q

What does the SG level controller adjust?

A

FW control valve for flow

FW pump speed for dP across the SG

The speed controller keeps the control valve in the range where response is linear.

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11
Q

What does the SG controller monitor to maintain level?

A

Actual level vs reference level
Steam flow vs. feed flow

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12
Q

Should charging flow change as power goes from 0 to 100%?

A

No. The PZR level program was designed to match the natural expansion of water along the Tavg program.

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13
Q

What are the two main causes of a change in charging flow?

A

RCS leak (restoring VCT level)

Temp instrument failure causing Tavg / Tref deviation

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14
Q

Describe the SD error signal in load reject

A

Auctioneered high Tavg vs Tref (from Pimp)

Opens when error > 2 F

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15
Q

Describe the SD error signal in plant trip

A

Auctioneered-high Tavg vs Thzp

Opens when error > 0 F

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16
Q

Describe the SD error signal in steam pressure

A

Steam header pressure vs manually adjusted setpoint (used for heat up and cooldown)

17
Q

What instrument failures would cause rod insertion?

A

Thot high
Tcold high
Pimp low
PR high

18
Q

What system is not available if a Pimp fails?

A

Steam dumps

19
Q

What signals do you get if a PZR P channel fails low?

A

An OTDT
A PZR low P trip
A SIS
A P11

20
Q

What Ps, Cs, and Ts do the PRs feed?

A

PR low trip
PR high trip
PR rate trip
P7 - P10
C2 - C4
OTDT
OPDT

21
Q

How do rods respond if Pimp fails low?
What does the operator do?

A

They drive in
Put rods in manual if no load rejection

22
Q

How do the SDs use the Pimp transmitters in load reject mode?

A

PT505 feeds how much to open the SDs based on Tavg vs Tref.

PT506 senses if a >10% load reject has occurred to arm the system.

SRO (11 decks)

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