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Systems > Containment Spray System > Flashcards

Containment Spray System Flashcards

1
Q

What is the function of the CSS?

A
  • Post accident limit of containment pressure rise to 55 psig or less.
  • Pressure of 50% or less of 55 psig within 24 hours.
  • Barrier to limit radioactive release (iodine entrapement),
  • HPSI subcooling during RAS,
  • HPSI pressure boost on loss of charging pumps due to fire.
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2
Q

What is the left train CSS?

Left Train Containment Cooling?

A

Left Train Containment Spray

  • 1-1 EDG
  • P-54B/C

Left Train Containment Cooling

  • 1-1 EDG
  • P-54B and P-54C
  • CV-3001 and its spray header
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3
Q

What is the right train CSS?

Right Train containment cooling?

A

Right Train Containment Spray

  • P-54A via 1-2 EDG

Right Train Containment Cooling

  • 1-2 EDG
  • P-54A
  • CV-3002 / its spray header
  • CACs VHX-1, VHX-2, and VHX-3
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4
Q

Describe the design of a CS pump.

A

Vertically split, horizontal centrifugal pumps with mechanical seals and auxiliary gland.

  • 1,340 gpm at 195 psia injection
  • 1800 at 175 psia recirc.

2300v, 250 hp, 55 amps at full load.

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5
Q

Describe the harsh environment features up the CS pumps.

A
  • Can operate continuously without seal cooling with pumped fluid at 130F.
  • Can only operate for 10 minutes with no seal cooling and pumped fluid at 320F
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6
Q

What are the CS throttle valves?

A

CV-3001/3002

  • 6-inch globe valves
  • powered by instrument air, backup via N2 Station 5.
  • Full open on CHP.
  • Fail open on loss of air/power.
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7
Q

What is the control and throttle power for CV-3001?

A

Closing: D-11-1 and D-21-1 Opening and Throttling D-11-1

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8
Q

What is the control and throttle power for CV-3002?

A

Closing, Opening, and Throttling D-21-1

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9
Q

What “arms” a containment spray pump?

A

SIAS

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10
Q

When do the CS throttle valves throttle and why?

A

On RAS at 2% in SIRW tank to reduce NPSH requirements of CS pumps.

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11
Q

What is RAS and its logic?

A

Switch from SIRW to Sump on 24” (2%) in SIRW.

1 out of 2 taken twice.

Left Channel LS powered via Y-10 (327) and Y-20 (328)

Right Channel LS powered via Y-30 (329) and Y-40 (330)

  • LS from Y-10 or LS Y-30 AND LS from Y20 or LS Y-40
  • Fires RAS relaying
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12
Q

Describe the containment sump.

A

22 feet in diameter, seven 4-inch floor drains, five 16-inch inlets, one 24-inch inlet and two 24-inch outlets to ECCS (CS & HPSI) pumps. One 4-inch outlet to radwaste.

Only two of the five 16-inch inlets, attached to passive strainers, are credited flow paths.

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13
Q

What are the passive strainers and what is unique in terms of flow path?

A

Installed on two of the 16-inch inlets and allow passage of no larger than 0.095 inch particles while meeting NPSH requirements.

They are the only post LOCA credited flowpath.

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14
Q

What is NaTB?

A

Sodium Tetraborate Decahydrate. Apprx 9k lbs in strainer baskets. Keeps ph >7 post RAS to maintain iodine captured via spray system.

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15
Q

What is the normal flow path of the CS system?

A

Not in service. Pump suction/discharge locked open, mini-flow locked closed, CV-3001/3002 spray control valves closed.

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16
Q

PRV-3001/3002 setpoint?

A

95 psig +/- 5 psig

17
Q

What opens CV-3071, P-66A Subcooling?

A

P-66A running and RAS signal.

18
Q

What opens CV-3070, P-66B Subcooling?

A

P-66B running and CV-3030 open

19
Q

What happens if CV-3030 does not open?

A

RAS closes CV-3001 after a 30-second time delay.

20
Q

What happens on CHP?

A

P-54A/B start, CV-3001/3002 open provided SIAS present.

P-54C will start 20-seconds later.

White light on pump controls indicate they have SIAS signal and are waiting on CHP.

21
Q

What is the left-train RAS signal?

A

Y-10 and Y-20 powering LS-0327/0328.

22
Q

What is right-train RAS signal?

A

Y-30 and Y-40 power LS-0329/0330.

23
Q

What happens on RAS?

A
  1. Sump outlets open
  2. SIRW outlets close
  3. SIRW recirc valves close if in ‘A’ postion
  4. CCW highcaps open and tcv’s close
  5. LPSI pumps trip
  6. CV-3001/3002 go to throttled
  7. Subcooling for operating HPSI pump opens.
24
Q

How is CS lined up to fill SI tanks?

A
  • SDC System goes through only E 60B.
  • SIT fill goes through E 60A.
  • Note: This is only done in Modes 5 or 6. This is NOT the normal way to fill the SITs.
  • Only one Spray Pump is used and its Recirculation path is unisolated. Flow from the Spray system through the Spray recirculation line and into the SIT fill and drain header.
  • Multiple tanks are filled at the same time for better pump performance. Due to the relatively low flows, this fill operation is limited to <= 8 hours for any one pump.
25
Q

What are CS control room controls on EC-03?

A

EC-03:

  • Spray Pump CS and status indicating lights,
  • Control switches for CV-3001/3002.
  • CS Valve CHP Bypass Switches,
  • SDC Heat Exchanger Inlet and Outlet Valves and HPSI Subcooling Valves
26
Q

EC-08 indications?

A

PI 1812 and PI 1805 indicate Containment Building Pressure in a range of 0 to 100 PSIA.

27
Q

EC-13 indications?

A
  • PI 0360, SDC HExch Inlet Pressure of 0 to 500 psig.
  • FI 0301A and FI 0302A, CSFlow indicators with a range of 0 to 3000 gpm,
  • LPIR 0382 and LPIR 0383, Containment Sump Level/Pressure Recorders record Containment pressure on one of their pens.
  • PIA 1814 and PIA 1815, Containment Pressure Indicating Alarms alarm at 0.85 psig and have a range of 0 to 5 psig.
28
Q

From memory, draw and label a one-line diagram of the Containment Spray System showing system interfaces and the following major components:

  • Containment Spray Pumps (P-54 A/B/C
  • Shutdown Cooling Heat Exchangers (E-60 A/B/C
  • Containment Spray Valves (CV-3001/3002
  • Containment Spray system control room indication
  • Containment Sump
  • SIRWT
A

Draw

29
Q

What is required for 100% Cooling with MSIV bypasses closed?

A

100% Cooling with MSIV bypass closed

  • 2 Spray pumps
  • 2 spray headers

OR

  • 1 spray pump
  • 2 spray headers
  • 3 safety relate CACs
  • 2 SW pumps
30
Q

What is required for 100% Cooling with MSIV bypasses open?

A

100% Cooling with MSIV bypasses open

  • 2 Spray pumps
  • 2 spray headers
  • 2 safety related CACs
  • 2 SW pumps

OR

  • 1 Spray pump
  • 1 spray header
  • 3 safety related CACs
  • 3 SW pumps
31
Q

What must you do if in SIAS Pre-Ras and only one P-54 operating?

A

SIAS Pre-Ras and only one P-54 operating

Manually secure HPSI pumps

A single P-54 can only supply 1 spray header and 1 HPSI pump (2 things)

Systems (53 decks)

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