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SRO Cert > Week 4: Engineered Safety Feature Actuation Signals > Flashcards

Week 4: Engineered Safety Feature Actuation Signals Flashcards

1
Q

What are the ESFAS signals?

A

SIS
CISA
CISB
CRVIS
FWIS
MSLIS
FBIS
AFAS
CSAS

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2
Q

What is the function of a SIS?

A

To shutdown the reactor, maintain the reactor shutdown, and ensure containment integrity.

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3
Q

What conditions will initiate a SIS?

A

Low SL pressure, 615 psig
Low PZR pressure, 1849 psig
High CTMT pressure, 3.5 psig
Manual

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4
Q

What is the function of a CISA?

A

To isolate all lines penetrating the containment not essential to Reactor Protection.

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5
Q

What conditions will initiate a CISA?

A

SIS
Manual

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6
Q

What is the function of a CPIS?

A

To isolate the CTMT purge system to prevent the release of radioactive material to the environment.

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7
Q

What conditions will initiate a CPIS?

A

CSIA
Rad monitors in purge system or CTMT reading high
Manual

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8
Q

What is the function of a CRVIS?

A

To ensure suitable atmosphere in the control room.

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9
Q

What conditions will initiate a CRVIS?

A

SIS
CPIS
CR ventilation rad monitors
FBIS
CL gas detection
Manual

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10
Q

What is the function of a FWIS?

A

To minimize the excessive cooldown that can result from overfilling the SGs.

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11
Q

What conditions will initiate a FWIS?

A

Hi SG level, 78%
Rx trip with low Tavg (564F)
SIS
Lo-Lo SG Level

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12
Q

What is the function of a MSLIS?

A

To prevent the excessive cooldown that would result from a SLB.

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13
Q

What conditions will initiate a MSLIS?

A

Low SL pressure, 615 psig
High SL pressure rate with SIS blocked, 100 psig down in 50s
Hi-2 CTMT pressure, 17 psig
Manual

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14
Q

What is the function of a FBIS?

A

To prevent the release of radioactive material to the environment.

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15
Q

What conditions will initiate a FBIS?

A

Radiation monitors in the FB ventilation system
Manual

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16
Q

What is the function of a CSAS?

A

To limit the pressure and temperature inside the containment building following an accident by initiating CTMT spray.

17
Q

What conditions will initiate a CSAS?

A

Hi-3 CTMT pressure, 27 psig
Manual

18
Q

What is the function of a CISB?

A

To isolate CCW to/from the RCPs to ensure complete isolation of all nonessential penetrations into containment.

19
Q

What conditions will initiate a CISB?

A

Hi-3 CTMT pressure, 27 psig
Manual

20
Q

What are the SI termination criteria?

A

PZR level stable/increasing
PZR pressure stable
30 degrees of subcooling margin
260,000 lbm/hr of AFW flow

SRO Cert (40 decks)

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