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Systems > Containment Hydrogen Control > Flashcards

Containment Hydrogen Control Flashcards

1
Q

What is the main purpose for Containment Hydrogen Control ?

A

It’s used to monitor hydrogen concentrations in containment following a LOCA

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2
Q

Following a LOCA, how is hydrogen gas generated inside containment ?

A

-Metal water reaction involving zirconium fuel cladding & RC
-Radiolytic decomposition post-LOCA emergency cooling solutions
-Corrosion of metals & paints by solutions used for Emerg. Cooling or Containment Spray

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3
Q

What Hydrogen Monitoring subsystem is provided in units ?

A

-Hydrogen Gas Analyzers
-Containment Isolation Valves

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4
Q

What is the Hydrogen Monitoring system designed to do?

A

Designed to measure hydrogen concentration in Containment

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5
Q

What emergency operating procedures are used ?

A

-LOCA
-Excess Steam Demand
-Entry into functional Recovery Procedure

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6
Q

Where do the Hydrogen Analyzers draw from & discharge to ?

A

-Draw from containment atmosphere
-Discharges back to containment atmosphere

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7
Q

Where does the Hydrogen Analyzers suction pass through ?

A

-Passes through associated trains Inside Containment Isolation Valve
-Passes through Analyzer discharge through inside Containment Isolation Check Valve

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8
Q

How many hydrogen analyzers are there per train ?

A

There are two redundant Hydrogen Analyzers ONE per Train

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9
Q

What indications does each Hydrogen Analyzers ? Where do it show indication at ?

A

Provided indication for hydrogen concentration inside containment, locally at the analyzer & in Control Room

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10
Q

What’re the normal conditions for Hydrogen Analyzers ? How long can accurate readings be attained ?

A

-Normally in standby condition & placed in service by control room
-When placed in service readings can be attained in 30 minutes

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11
Q

How is Containment hydrogen concentration measured ?

A

Draws sample of containment atmosphere through each gas analyzer

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12
Q

What does each Gas Analyzer consist of ?

A

Consist of a:
-Sensor
-Electronic sub-assembly
-Local & remote alarms & readouts

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13
Q

What kind of Gas Bottles are used with Hydrogen Analyzer ?

A

-Span Gas & Reagent Gas mounted next to Hydrogen Analyzers

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14
Q

Why is Span Gas & Reagent Gas Bottles needed for the Hydrogen Analyzers ?

A

Span Gas Bottle- Required for calibration of Analyzer

Reagent Gas Bottle-Required for operation of Analyzer

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15
Q

When should the POST Accident Monitoring Instrumentation be FUNCTIONAL ?

A

In Modes 1,2,and 3 it shall be FUNCTIONAL

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16
Q

What does the Post-Accident Monitoring instrumentation ensure ?

A

-Ensures sufficient info is available on selected plant parameters to monitor & assess the variable following accident

17
Q

What is the normal position of the Hydrogen Containment Isolation Valves ? What happens to containment isolations when Hydrogen Analyzers are placed in service ?

A

-They’re normally closed & will open when Hydrogen Analyzers are placed in service

18
Q

Where are the Inside Containment Isolation Valves operated from ?

A

They’re operated from control room

19
Q

What will auto close the Hydrogen Containment Isolation Valves ?

A

Automatically close on a CIAS

20
Q

Hydrogen Control Monitoring subsystem is aligned for operation following what ?

A

-LOCA
-Excess Steam Demand
-Direction from Functional Recovery Procedure

21
Q

How do Hydrogen Control Monitoring system interface with 480VAC CLASS(PH)?

A

PH provides power for:
-Hydrogen Analyzers
-Hydrogen Control Containment Isolation Valves
PH D-Panel provides 120VAC power to:
Hydrogen Analyzer Control Panels

22
Q

How does Hydrogen Control Monitoring system interface with PK system ?

A

PK provides power to solenoid operated Hydrogen Analyzer Isolation Valves

23
Q

How does Hydrogen Control system interface with Containment Building HVAC(HC) ?

A

HC provides mixing of Containment atmosphere which enables accurate reading by Hydrogen Analyzers

24
Q

How does Containment Hydrogen Control interface with Heat Tracing(QM)?

A

-Heat Tracing provided to prevent condensation in supply line to Hydrogen Analyzers

25
Q

How does Containment Hydrogen Control system interface with Safety Injection(SI)?

A

Containment Spray provides mixing of Containment Atmosphere to prevent localized buildup of hydrogen within Containment

26
Q

How does Containment Hydrogen Control interface with ESFAS?

A

CIAS will close Containment Hydrogen Control Containment Isolation Valves

Systems (62 decks)

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