N32 - EHC Flashcards

1
Q

What is the EHC system mainly controlling?

A

Reactor pressure to control reactivity

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2
Q

What happens if turbine limit (setpoint) is exceeded?

A

Bypass valves open

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3
Q

What happens if EHC pump ‘B’ < 1600 psig @ >26% power?

A

Turbine trip and reactor SCRAM

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4
Q

how many overspeed protection systems are required?

A

Both of them:

DOPS and back-up overspeed (ovation)

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5
Q

How many bypass valves are there?

A

3 bypass valve.

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6
Q

How much can bypass valves bypass?

A

30%, (10% each valve)

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7
Q

How many bypass valves are required? why?

A

2 required

thermal limit penalty imposed by MCPR and LHGR

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8
Q

How many stop and control valves are required?

A

ALL of them

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9
Q

If EHC is ingested, what should be done?

A

induce vomiting

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10
Q

What PPE should be used when around EHC fluid?

A

Glove, face shield, respirator

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11
Q

What type of respirator should be used when handling EHC fluid?

A

Air purifying

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12
Q

What level should not be exceeded when filling EHC reservoir? why?

A

34” to prevent overfilling tank

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13
Q

when will the standby EHC pump auto-start?

A

<1800 psig on running pump OR header if pump is in Auto-STBY

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14
Q

What are the EHC pump trips?

A

< 15” EHC tank level LO-LO

MPD

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15
Q

What are the heater start permissives?

A

> 15” tank level

Recirc pump must be running

< 105 deg F heater start

> 115 deg F heater stop

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16
Q

When will the main turbine trip relative to EHC pressure

A

<1600 psig

17
Q

What does the cornsilk color mean?

A

it is selected

18
Q

When does the high filter DP alarm come in?

19
Q

What’s the primary purpose of the stop valves?

A

prevent overspeed of turbine on turbine trip

20
Q

on a turbine trip, what controls Rx pressure?

A

Bypass valves

21
Q

What must be done for a setpoint to be active?

A

Enable or confirm it

22
Q

How do control/bypass/stop valves operate?

A

Fluid to open, spring to close

23
Q

what valves are fast close, and which are fast opening?

A

Fast close – stop and control valves

Fast opening – bypass valves

24
Q

What’s the power supply to EHC pumps?

A

A - 13AD

B - 14AE

25
What's the power supply to Ovation? | and control power?
Inverter power 120 VAC (BOP)
26
What's the tech spec part of EHC? (safety function)
BYPASS VALVES
27
What cools EHC
TBCW
28
How does the Temp control valve fail?
OPEN (max cooling)
29
What needs to be running to run the EHC heater?
Recirc pumps
30
What temp does the heater maintain?
105 - 115 deg F
31
What the SCRAM setpoints? (EOC RPT) and (EHC pressure)
TSV < 675 psig TCV < 970 psig <1600 psig header pressure
32
When are the SCRAM setpoints bypassed?
< 26% Rx power
33
What type of SCRAM is the EHC scram?
RPS scram
34
What is temp maintained at when running by temp control valve?
115 - 130 deg F