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Annual Prep > Steam Dumps > Flashcards

Steam Dumps Flashcards

1
Q

What are the steam dump controls based on?

A
  • Auctioneered High Tavg
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2
Q

Which group(s) stagger open instead of opening all together? ***

A
  • Group 1 only
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3
Q

Where are the arm/block solenoids powered from?

A
  • VDCD (Train “A”)

- VDAB (Train “B”)

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4
Q

What is Conditional C7A and is it an arming or blocking signal? **

A
  • Arming signal (Load Rej)

- 10% Step Load Change or 5% / min on MPC-254.
Allows operation of Group 1 and 2 Valves

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5
Q

What is Conditional C7B and is it an arming or blocking signal? **

A
  • Arming Signal (Load Rej)

- 30% Step Load Change on MPC-254.
Allows operation of Group 3 Valves

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6
Q

What is Conditional C8 and is it an arming or blocking signal? **

A
  • Arming Signal (Turb Trip)
  • 4/4 Main Turbine Stop Valves Closed
    OR
  • 2/3 Oil Pressure switches below 800#
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7
Q

What is Conditional C9 and is it an arming or blocking signal? **

A
  • Blocking Signal
  • 1 Circulating Water pp breaker closed.
  • CRID 2 energized.
  • Pressure switches on 3/3 Condensers ≥ 20.6 inHg
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8
Q

What is Conditional P12 and is it an arming or blocking signal?

A
  • Blocking Signal
  • 2/4 Tave < 541°F - Status Light ON
    (P-12 Active (Status Light ON) Steam Dumps are Blocked in All Modes until placed in “Bypass Interlock“)

(3/4 Tave > 541°F - Status Light OFF)

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9
Q

What does the bypass interlock for P12 allow?

A
  • allows group I steam dumps to operate when P12 met

Bypass seals in until reset or P-12 block clears

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10
Q

Which ctrl switch will reset C7A and C7B conditionals and how are they reset?

A
  • Mode Ctrl Switch and must be taken to off/reset
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11
Q

Which steam dump groups are allowed to operate when the turbine trip controller is activated?

A
  • Groups I and II
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12
Q

Which steam dump groups are allowed to operate when the load rejection controller is activated?

A
  • Groups I, II, and III
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13
Q

What is the design of the steam dumps? **

A
  • Plant design accepts a step load reduction of 50% from full power by using the 40% from Non-Safety Related Steam Dump system and 10% from Rods
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14
Q

What signals does the turbine trip ctrlr use to open steam dumps?

A
  • Auctioneered High Tavg - Tno-load
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15
Q

What signals does the load rejection ctrlr use to open steam dumps?

A
  • Auctioneered High Tavg - Tref
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16
Q

What signal gives you Tref?

A
  • MPC-253 (First Stage Impulse #)
17
Q

When will group I open with the Turbine Trip Ctrlr?

A
  • 0°F to 10°F ΔT - Modulates open
  • 0%-33% Demand
  • If > 10°F ΔT -Trips Open
18
Q

When will group II open with the Turbine Trip Ctrlr?

A
  • 10°F to 20°F ΔT - Modulates Open
  • 33%-67% Demand
  • If > 20°F ΔT - Trips Open
19
Q

When will group I open with the Load Reject Ctrlr?

A
  • 5°F to 9°F ΔT - Modulates open
  • 0%-33% Demand
  • If > 9°F ΔT - Trips Open
20
Q

When will group II open with the Load Reject Ctrlr?

A
  • 9°F to 13°F ΔT - Modulates open
  • 33%-67% Demand
  • If > 13°F ΔT - Trips Open
21
Q

When will group III open with the Load Reject Ctrlr?

A
  • 13°F to 17°F ΔT - Modulates open
  • 67%-100% Demand
  • If > 17°F ΔT - Trips Open
22
Q

Which mode only allows modulating of steam dumps?

A
  • Steam Pressure Mode

No trip functions

23
Q

How much turbine load are the steam dumps designed to handle on a load rejection?

A
  • 40% Load
24
Q

What is the Power Supply for the trip open solenoids?

A
  • VDAB
25
Q

*** A Unit 2 reactor trip occurred from 90% power. The following plant conditions exist:

  • Reactor trip breakers: OPEN
  • Main turbine stop valve (C): OPEN
  • Condenser vacuum: 21.4 in. Hg.
  • RCS Tavg: 561°F
  • Auto Stop Oil Pressure: 400 psig

Assuming all other equipment operated as designed and no operator actions are taken, the Steam Dump system is:

A. armed and dumping steam to the condenser with group 1 trip open solenoid bistables energized.

B. armed and dumping steam to the condenser with groups 1 and 2 trip open solenoid bistables energized.

C. armed but not dumping steam to the condenser because of a blocking signal.

D. not armed and not dumping steam to the condenser.

A

A. armed and dumping steam to the condenser with group 1 trip open solenoid bistables energized.

26
Q

If MPC-253 or MPC-254 Fail High in Tavg mode, what affect will it have on steam dumps?

A
  • Will have no affect
27
Q

If MPC-253 Fails low in Tavg mode, what affect will it have on steam dumps?

A
  • Will have no affect because it has no arming signal
28
Q

If MPC-254 Fails low in Tavg mode, what affect will it have on steam dumps?

A
  • Will have no affect because it has no demand signal
29
Q

If you take the ctrl selector switch to off/reset, what will it do?

A
  • If you previously bypassed your P12 signal, it will re-enable P12
30
Q

What are the trip open signals for Turbine Trip bistables for steam dumps? ***

A
  • 10°F Group I
  • 20°F Group II
    (Direct 20# air to the trip/open valves)
31
Q

What are the trip open signals for Load Rejection bistables for steam dumps?

A
  • 9°F Group I
  • 13°F Group II
  • 17°F Group III
    (Direct 20# air to the trip/open valves)
32
Q

If CRID 1, 2 and 4 are lost, can steam dumps still operate?

A

No, steam dumps remain closed

33
Q

Whats the fastest cooldown rate allowed with steam dumps?

A
  • 100°F per hour
34
Q

If UPC-101 fails high while in steam pressure mode, what will happen to steam dumps?

A
  • Groups I and II will go full open until P12 is met
35
Q

If UPC-101 fails low while in steam pressure mode, what will happen to steam dumps?

A
  • Any open steam dump valves will close
36
Q

If Tavg fails high > 20°F ΔT with no turbine trip, what will happen to steam dumps?

A
  • Nothing will happen, because the C7A and C7B arming signals are not in
37
Q

If Tavg fails high > 20°F ΔT with a turbine trip, what will happen to steam dumps?

A
  • Groups I and II will go full open and stay full open until P12 is met and then it will cycle at 541°F
38
Q

During the final stages of an RCS heatup, the Steam Dump System is set to automatically control RCS temperature at 541°F.

Which ONE of the following is the correct Steam Dump Pressure Controller setpoint required to
maintain RCS temperature at approximately 541°F Tavg?

A. 940 psig
B. 955 psig
C. 970 psig
D. 985 psig

A

B. 955#

39
Q

Load Rejection control will maintain temperature within ___ between Auctioneered High Tavg and Tref with no rod motion. ***

A
  • 5°F

Annual Prep (7 decks)

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