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RO34 - Revised and Upgraded Decks > CTS and H2 Recombiners > Flashcards

CTS and H2 Recombiners Flashcards

1
Q

What is the purpose of the CTS system?

A
  • Limits post-accident containment pressure and temperature to less than design values
  • Removes radioactive elemental iodine from the containment atmosphere in the event of a DBA.
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2
Q

What is the purpose of the H2 Recombiner?

A

Control the hydrogen generated in the containment after a loss of coolant accident (LOCA)

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3
Q

What is the purpose of DIS?

A

Eliminates hydrogen in containment following a LOCA to prevent a detonation by periodic ignition of hydrogen-air mixtures

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4
Q

What are the ESF systems in the plant?

A
  • Ctmnt Structure
  • ECCS System
  • Ice Condenser
  • CTS
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5
Q

What are the CTS pump starts?

A
  • Load Shed (W/ Phase B)
  • Phase B
  • Manual

CTS Signal does NOT start the Pumps!

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6
Q

What are the CTS pump Trips?

A
  • Load Shed
  • Overload/Overcurrent
  • Manual
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7
Q

What causes a CTS signal?

A

2.8# (2/4 on LOWER containment pressure)

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8
Q

What are the fission product barriers?

A
  • Fuel Clad
  • RCS
  • Containment
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9
Q

What do you declare if you lose one or potential to lose one fission product barrier?

A

Unusual event

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10
Q

What do you declare if you lose two fission product barriers and potential to lose a thrid fission product barrier (Fuel Clad or RCS Barrier)?

A

General Emergency

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11
Q

What do you declare if you lose any TWO of the following:

  1. Loss or Potential Loss of Fuel Clad.
  2. Loss or Potential Loss of RCS.
  3. Loss of Containment Barrier.
A

Site Area Emergency

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12
Q

What happens on a SAT low-low lvl?

A
  • SAT outlet valves close
  • Eductor suction valves should have closed prior to the SAT Low Low lvl alarm but it sends the signal again
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13
Q

Which CTS header does RHR feed and how much flow?

A

Upper Containment Spray Hdr only at 2000gpm

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14
Q

What is the intended pH of the recirc sump due to CTS?

A

7-10 pH

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15
Q

What is added to the SAT to help remove radioactive iodine?

A

Sodium Hydroxide

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16
Q

What do we use in the SAT to minimize moisture (dilution of tank)?

A

Nitrogen over-pressure

17
Q

Can the H2 Recombiners be started in modes 1-4?

A

Yes, but you have to declare the EDGs inoperable because it will over load the EDGs in the event of an SI with LOOP (Load Cons)

18
Q

What powers the H2 recombiners?

A
  • 11/21 B
  • 11/21 C
19
Q

Will the H2 recombiners trip on a load shed?

A

No

20
Q

Will the CTS pump auto start on a Containment Spray Signal?

A

NO!

21
Q

What signal will give a Main Steam Isolation?

A

2.8 psi, AUTO Phase B

22
Q

What will 2.8 psi in containment cause?

A
  • Phase B
  • Ctmnt Spray Actuation
  • Steam Line Iso (auto only)
23
Q

What are the auto actions of a Ctmnt Spray Actuation?

A
  • CTS pump disch valves open
  • SAT outlet valves open
24
Q

What are the H2 production sources?

A
  • Zirc (Clad) H20 reaction
  • Radiolytic decomp of H20
  • Corrosion of metals inside containment
25
Q

What is the purpose of the Spray Add educator?

A

Draws the NaOH solution from the SAT and mixes it with a portion of the CTS pump discharge flow

26
Q

What must be closed before you can open ICM-305 and 306?

A

Normal Suction from RWST for both CST and RHR Pumps must be closed
- RHR normal suction from RWST must be closed (IMO-310/320)
- CTS normal suction from RWST Must be closed (IMO215/225)

27
Q

When do the ESW to CTS Hx outlet valves throttle open and to what flow?

A

Throttle open on a CTS Signal and ICM 305/306 open to 2400gpm

28
Q

What is the purpose of the lower end of the pH band for the Spray Add System? (8.5 pH)

A

Keeps iodine in solution

29
Q

What is the purpose of the upper end of the pH band for the Spray Add System? (10 pH)

A

prevent chloride and caustic stress corrosion on equipment

30
Q

Which Channel / Instrument of lower containment pressure feeds into CTS, but NOT SI?

A

PPP-303, which is Channel 1

Channel 1 does 1 thing

31
Q

If utilizing the manual Phase B switches in the control room, what can you expect to happen?

A
  • Actuates Train Specific Phase B
  • Actuates Train Specific CTS
  • Actuates Train Specific CVI
  • Starts CTS pumps

SLI will NOT come from manual Phase B. It is AUTO ONLY.

32
Q

During flow testing, the purpose of the containment spray pump test line is to minimize what?

A

closed loop heatup

33
Q

How many spray headers are there in contaiment?

A

2 CTS (Upper and Lower)
2 RHR (Upper Only, 1 for each Train)

34
Q

Hydrogen Recominbiers ________ be tested in mode 4 and recombintations of Hydrogen and Oxygen occurs at _________ degrees F

A

CAN NOT

1135 degrees F

35
Q

How long is the delay for a CTS Pump start after the Phase B Signal?

A
  • 240 seconds for Unit 1
  • 30 seconds for Unit 2
36
Q

To have an OPERABLE DIS Train, how many Hydrogen ignitors must you have capable of being energized?

A

34 of the 35 ignitors must be capable of being energized.

This is PER TRAIN. 70 ignitors total.

37
Q

How is temperature in the hydrogen recombiners maintained?

A

Controlling power ot the heaters

38
Q

What is the standby alignment position of ht e eductor supply valves?

A

Open

39
Q

If it is determined that a containment spray system TS LCO (3.6.6) is not met soley due to an AC electrical distribuation system being declared INOP, when must a SFD be performed?

A

When the conidtions and required actions associated w the supported system LCO are not entered

RO34 - Revised and Upgraded Decks (84 decks)

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