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Area 3 > Safety Injection > Flashcards

Safety Injection Flashcards

1
Q

What are the flow rates for a running Containment Spray pump?

A

3900 gpm

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2
Q

What are the flow rates for a running LPSI pump?

A

4250 gpm

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3
Q

What are the flow rates for a running HPSI pump?

A

850 gpm

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4
Q

What are the recirc limits for the Containment spray pumps?

A

150 gpm for one hour, 2100 gpm continous

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5
Q

What are the recirc limits for the LPSI pumps?

A

100 gpm for one hour, 2400 gpm continous

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6
Q

What are the recirc limits for the HPSI pumps?

A

85 gpm for one hour, 225 gpm continous

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7
Q

What is the Containment spray system expected to reduce containment from max design pressure to?

A

Reduce pressure from peak value to 1/2 peak in 24 hours

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8
Q

What is used to fill the SIT’s?

A

The ‘B’ HPSI Pump

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9
Q

What does a SIT need to be considered operable?

A

MOV full open with power removed, with sufficient volume, boron concentration, and N2.

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10
Q

What is the limit to heating up the SDC loop? What is the limiting component?

A

19 degrees F per min. The SDC HX.

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11
Q

What is the flow limitation for RWLIS to be accurate if the same train of SDC is being used?

A

5000 gpm. Above 5000 gpm you should use the other train of RWLIS indication as it will be more accurate.

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12
Q

What is the temperature limit above which SDC header venting shouldn’t occur?

A

200 degrees F

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13
Q

How are the SDC containment isolation valves interlocked?

A

If pressurizer pressure is greater then 385 psia they will not open

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14
Q

What is the SDC low flow alarm set-point for one pump operation?

A

3615 gpm

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15
Q

What is the SDC low flow alarm set-point for two pump operation?

A

7400 gpm

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16
Q

If a LPSI or CS pump is shutdown for greater then one hour, how many consecutive starts may be attempted?

A

Two

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17
Q

If a CS or LPSI pump is shutdown for less then one hour, how many consecutive starts may be attempted?

A

One

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18
Q

What are the limits that are in place for placing a CS pump into service for SDC?

A

RCS temp- 200 degrees F

RCS press- 250 psia

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19
Q

What is the Safety Injection system’s design basis?

A

-Peak Cladding temp

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20
Q

What is SDC design basis?

A
  • Cool the RCS to 125 degrees F in 27.5 hours
  • Limit core HUR and CDR to 75 degrees F/hr
  • Capable of 1 year operation following LOCA
  • One train maintain RCS temp
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21
Q

Containment spray system design basis?

A
  • Prevent exceeding containment design press and temp (60 psig and 300 degrees F)
  • Maintain containment press and temp at acceptable level during recirc ops.
  • Reduce containment pressure from peak value to 1/2 peak value in less than 24 hours.
  • Provide 100 percent of the required heat removal capability an partially remove iodine from the containment atmosphere.
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22
Q

What is the LPSI pumps shutoff head?

A

150 psia

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23
Q

CS pump shutoff head?

A

150 psia

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24
Q

What is the design pump flow in the CS and LPSI pumps?

A

5000 gpm

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25
Q

Around how much volume does a SIT contain?

A

14,000 gallons

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26
Q

Where can the SIT’s be drained to?

A

RWT

27
Q

At what level in the containment spray header do we get a level low alarm?

A

113’

28
Q

If we are to be in SDC for longer then four days, what is our temperature limit?

A

RCS temp less then 135 degrees F

29
Q

What is the power used on the SDC containment isolation valves? (Ones inside of containment)

A

Powered from PK to INV that makes it AC. AC prevents sparking inside of containment

30
Q

When SDC is aligned using the LPSI pump what are the requirements with the LPSI’s normal suction from the RWT?

A

Must be closed and down-powered. Prevents leakage from RWT into SDC system. The LPSI pump suction check valves are not considered boundary valves.

31
Q

What are the baskets inside of containment?

A

Trisodium phosphate

32
Q

What is TSP used for?

A

Used to raise the pH of the water inside of containment to keep iodine in solution and not in the atmosphere. Also helps inhibit stress corrosion cracking of stainless steel.

33
Q

What is the boron concentration, gas pressure, and pipe size of the SIT tanks sized for?

A

3 of the 4 tanks operating the recover the core in the event of a LOCA before significant clad melting or zirconium water reaction can occur.

34
Q

When will a LPSI pump automatically start?

A

SIAS, CSAS

35
Q

When will a LPSI pump trip?

A

RAS (RWT level 9.4%). Maintains NPSH to HPSI and CS pumps

36
Q

What is the effect of operating a LPSI or CS pump in the rumble region?

A

creates increased erosion of piping and impeller

37
Q

When you start a LPSI pump what do you expect lube oil level to do?

A

rise approx. .75 inches

38
Q

When you start a LPSI pump what do you expect the radial bearing oil (below the sightglass) to do?

A

Level will lower during operation of the pump

39
Q

What is the HPSI pumps shutoff head?

A

1850 psia

40
Q

After a LOCA when will the operator begin to direct some of the HPSI flow to the associated hot leg?

A

2-3 hours post LOCA to flush out precipitated boron

41
Q

At what temperature should we limit RCS temperature before utilizing a LPSI pump on SDC?

A

300 degrees F

42
Q

How do we check for oil leakage on a HPSI pump?

A

If oil is present. Wipe only the skid, not the bubbler. Return in 30 minutes, if more oil is present then contact the SM/CRS. HPSI’s have a 2 drop per hour limit.

43
Q

What is the limit for RCS level to operate a LPSI and CS pump on the same shutdown cooling loop?

A

107 feet

44
Q

What is the RCS level limit to operate a CS pump on a shutdown cooling loop?

A

103’ 1”

45
Q

What is the RCS level limit to operate both trains of shutdown cooling?

A

104’ (except when we are swapping SDC trains)

46
Q

What is the RCS level limit to operate a LPSI pump on SDC?

A

101’ 6”

47
Q

With RCS level between 101’ 6” and 102’; what is the SDC flow limit?

A

3780 gpm - 4150 gpm

48
Q

With RCS level between 102’-103’; what is the SDC flow limit?

A

3780 gpm- 4600 gpm

49
Q

What is the “rumble region”?

A

It is an interaction of flow induced swirl of water

50
Q

How do we control SDC purification flow rates?

A

Letdown backpressure control valves. As directed by CRS.

51
Q

What is the HPSI cold leg injection orfice used for?

A

Balance SI flow. 50% HL and 50% CL’s

52
Q

At what level do we need to notify the control room in the containment spray header?

A

114’

53
Q

When we are filling the containment spray header ‘A’; what level do we need to be careful not to fill to? Why?

A

115.3’ because is may cause the header to overflow into the nozzles in containment

54
Q

When we are filling the containment spray header ‘B’; what level do we need to be careful not to fill to? Why?

A

116’ because is may cause the header to overflow into the nozzles in containment

55
Q

What are the inventory requirements for the RWT?

A
  • 20 min full SI flow. All pumps both trains w/ 10% margin
  • Fill refuel pool and/or cavity
  • Equal flows delivered to each injection point regardless of break location
56
Q

Discuss OE with valves in the CS pump rooms?

A

Reach rod was being operated; indication at VPI showed it was closed. The sheer pin had broke and the valve was actually open. You must look at the valve stem to see if the valve is in the position you are required to put it in.

57
Q

Discuss the HPSI pumps.

A
  • 8 stage, centrifugal, powered from PB
  • Auto start on SIAS/CSAS
  • Can inject into all four CL’s and associated HL
58
Q

Why don’t we use HPSI ‘A’ to fill the SITs?

A

‘B’ is piped for it and has a procedure.

59
Q

What is some PVNGS with the RAS sumps?

A

We had voids, places where air was entrenched in our lines. The NRC thought we need to have the RAS line filled. We argued that our line was “self-venting”. Come to find out it was not self venting and we now fill the RAS line.

60
Q

Discuss the prestarts on the LPSI pumps?

A
  • upper bearing oil level
  • lower bearing oil level
  • radial bearing oil level
  • motor space heater running (@MCC)
61
Q

Discuss the prestarts on the CS pumps?

A
  • upper bearing oil level
  • lower bearing oil level
  • motor space heater running (@MCC)
  • One of the suction valves open. (V105 or V184)
62
Q

What is the SI systems mission time?

A

30 days

63
Q

In the worst case; how long will into an even will a HPSI pump actuation signal occurs?

A

10.5 seconds

Area 3 (6 decks)

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