E21 - LPCS Flashcards

1
Q

What pressure does Inj valve open?

A

476 psig

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2
Q

what will trip LPCS motor?

A

LSS

Motor Protection

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3
Q

When does min flow valve open? close?

A

opens with pump running, and <1333 gpm

closes @ >1376 gpm

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4
Q

How long is allowable to run LPCS on min flow?

A

30 minutes

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5
Q

Does injection valve receive auto open signal on initiation?

A

yes, but does not open until <476 psig

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6
Q

When will inj valve auto close?

A

NEVER

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7
Q

When will the suction valve auto open?

A

NEVER. it will never auto close or open

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8
Q

what flow should not be exceeded to prevent pump damage?

A

9100

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9
Q

What is motor cold and how many start attempts?

A

80 minutes idle, 2 starts allowed

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10
Q

what is motor hot? How many start attempts allowed?

A

Pump running for 30 minutes

1 restart allowed. additional allowed after 20 minutes idle

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11
Q

What is the flow rate of LPCS?

A

7115 gpm @ 290 psid, 7450 gpm @ 125 psid

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12
Q

What low pressure pumps start first and when? when do the other pumps start?

A
  1. 5 seconds - LPCS/RHR C

7. 5 seconds - RHR A/B

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13
Q

what does the min/flow line restrict flow to?

A

1250 gpm

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14
Q

what flow will the jockey pump provide?

A

40 gpm @ 47 psig

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15
Q

what’s the purpose of test return valve?

A

used for full flow testing returning to suppression pool

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16
Q

when does LPCS initiate?

A
  • 150.3” Rx level

1. 39 psig DW pressure

17
Q

what level is required in suppression pool for NPSH

A

> 14.5’ or

18’ 4 1/2” to be operable

18
Q

what cools LPCS pump room?

19
Q

When can the inj valve F005 be manually opened after initiation?

20
Q

If pressure drops below 530 psig (manually open setpoint after initiation), how long after it goes back up can it still be manually opened?

A

15 minutes

21
Q

what pressure can LPCS inject at?

A

< 476 psig (pump starts… valve opens at 476)

22
Q

What is the suction source for LPCS?

A

Suppression pool

23
Q

What is the purpose of LPCS?

A

Automatically initiate to restore and maintain Rx water level to mitigate effects of a LOCA.
Sprays inside core shroud and directly onto fuel bundles.

24
Q

LPCS power supply?

25
Purpose of the LPCS jockey pump?
keeps discharge line full to prevent water hammer and minimize injection time
26
what is the additional purpose of the jockey pump?
provides fill water to div 1 suppression pool instrument reference leg
27
what provides the manual over-ride of LPCS?
Loss of 15AA bus Loss of logic power Div 1 ECCS initiation signal is reset