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Systems > CRDM Cooling > Flashcards

CRDM Cooling Flashcards

1
Q

P.S. To CRDM cooling fans?

A

1E11- 12J

1E12- 12I

1E13- 12J

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2
Q

When must CRDM cooling fans be energized? When is it not req but desired?

A

Prior to 350 deg Anytime CRDM energized Natural circulation (faster cooldown)

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3
Q

Describe CRDM cooling system including flowpath

A

Three fans, two running (100% flow) one in off, non running fan backdraft damper closed. Flow enters side of IHP, flows down towards head, guided across head and up IHP through fans

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4
Q

Purpose of CRDM cooling system

A
  • remove heat from CRDM coils and Rx head - cool concrete in primary shield wall - provide full flow w/2 fans - ease of disassembly (IHP)
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5
Q

Interlocks associated w/CRDM cooling fans

A

If in auto restart- if power lost and subsequently restored fan will restart after time delay

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6
Q

CRDM cooling fans- what is purpose of power transfer switches

A

Provide temporary source of power from other unit during outages NOT for alternative power to fans

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7
Q

Precautions and limitations for CRDM cooling

A

Don’t run three fans in parallel Don’t use power xfr switch for alt power for fans only for outage use

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