Main Steam System Alarms Flashcards Preview

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Flashcards in Main Steam System Alarms Deck (6):
1

EK-0130, "STEAM AND FEEDWATER PENETRATION HI TEMP"

EK-0130, "STEAM AND FEEDWATER PENETRATION HI TEMP"

  1. Alarm is indicative of a ventilation system failure or a steam leak in the area.
  2. ARP-1 directs verifying proper ventilation, initiating a work request, and referring to SOP-24.
  3. If the cause is a steam leak, it must be isolated or the plant must shutdown to allow repair.

2

EK-0166, "MAIN STEAM ISO VALVE ACCUMULATOR LO PRESS"

EK-0166, "MAIN STEAM ISO VALVE ACCUMULATOR LO PRESS"

  1. Indicates a loss of instrument air, a local air leak, or a solenoid leaking by
  2. ARP-1 directs performance of EOP-1 if the reactor tripped, checking solenoid valves, or valving in high pressure air.
  3. The plant will trip if an MSIV drifts off its open limit switch.

3

EK-0965, "STEAM GEN LO PRESS CONTROL CKT UNDERVOLTAGE"

EK-0965, "STEAM GEN LO PRESS CONTROL CKT UNDERVOLTAGE"

  1. Indicates loss of Y10, Y20, Y30, or Y40 supply to the Steam Generator pressure channels
  2. ARP-5 directs reference to ONP-24.
  3. Steam Generator pressure channels will fail low on loss of power and 2/4 channels at 512 psig will close the MSIVs. This will trip the reactor.

4

EK-0966, " MAIN STEAM ISOLATION VALVE UNDERVOLTAGE

EK-0966, " MAIN STEAM ISOLATION VALVE UNDERVOLTAGE

  1. Indicates loss of 125V DC (D11-1 or D21-1) supply to MSIV control circuit/solenoid valves
  2. ARP directs reference to ONP-2.3, Loss Of DC Power.
  3. If loss of power to the MSIVs results in closing the MSIVs, it will trip the reactor.
  4. Will need manual action to close MSIVs

5

EK-0970, "STEAM GEN VALVES ISOLATION LOCKOUT

EK-0970, "STEAM GEN VALVES ISOLATION LOCKOUT

  1. Indicates bypass of MSIV closure on Low SG pressure with pushbutton (HS/LPE-50A and/or B) depressed with 3 of 4 SG pressure channels less than 548 psia, but greater than 512 psia.
  2. Defeats Auto closure of affected MSIV, FW Reg Valve, and FW Bypass Valve due to low SG pressure
  3. ARP directs reference to in-use EOP or GOP-9 if applicable.

6

EK-3405, "MAIN STEAM PEN ROOM HIGH TEMP

EK-3405, "MAIN STEAM PEN ROOM HIGH TEMP

  1. Alarm is indicative of a ventilation system failure or a steam leak in the area.
  2. ARP directs verifying proper ventilation.
  3. If the cause is a steam leak, it must be isolated or the plant must shut down to allow repair.