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systems test 3 > PCCW > Flashcards

PCCW Flashcards

pccw

1
Q

STATE the functions of the Primary Component Cooling Water (CC) System

A
  • It removes heat from radioactive and potentially radioactive systems and components during normal and emergency plant evolutions.
  • It acts as an intermediate barrier between radioactive fluid systems and the environment during normal and emergency plant evolutions.
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2
Q

LIST the major components of the CC system and EXPLAIN their functions

A
  • PCCW Pumps
  • PCCW Heat Exchangers
  • PCCW Temperature Control Valves
  • Head Tank
  • Radiation Detectors
  • Flow Indicators
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3
Q

LIST the essential heat loads served by the CC system

A
  • RHR pumps (seal coolers)
  • RHR heat exchangers
  • Centrifugal Charging Pumps (oil coolers)
  • SI pumps (oil coolers)
  • CBS pumps (seal coolers)
  • CBS heat exchangers
  • Containment enclosure cooling units
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4
Q

STATE the normal CC system temperature and flowrate

A
  • Train (A) 65 - 75°F.
  • Train (B) 65 - 78°F
  • Total system flow is normally about 10,500 gpm per loop
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5
Q

EXPLAIN the purpose for the CC pump trip on CC supply header over temperature.

A
  • Because of the seismic supports on the pump, it is anticipated that the pump and associated piping may not be able to expand properly at high temperatures.
  • Therefore, if the supply header temperature reaches 135°F, the running pump will trip.
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6
Q

STATE the system and method used to provide makeup water to the CC head tanks

A

Demin water system

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7
Q

LIST the power supply to each CC pump

A
  • Train A (P-11A & C) 4160 KV Bus 5

* Train B (P-11B & D) 4160 KV Bus 6

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8
Q

LIST the two (2) locations where a CC pump can be operated, and DESCRIBE the changes when control is shifted to LOCAL

A

Pumps are controlled either locally at the pump switchgear or remotely at the MCB.
• When the pump is being operated locally, all pump automatic control or interlock functions and the high temperature trip are bypassed, including the emergency power sequencing system control signals.

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9
Q

DESCRIBE three flow arrangements used in the CC loops and EXPLAIN their uses

A
  • Automatically throttled heat loads-Used when desired temperatures are required
  • Manually throttled heat loads-Used when a constant flow rate is required
  • Unrestricted flow heat loads-Used when the component does not depend on a PCCW temperature band.
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10
Q

LIST the major components of the Thermal Barrier Cooling Water System

A
  • 2 -100% capacity pumps
  • 2 Heat Exchangers in series
  • 1 Full flow head Tank
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11
Q

EXPLAIN what happens in the Thermal Barrier Cooling Water System if there is a high outlet flow, and DESCRIBE the possible effects

A

A flow transmitter on the cooling water outlet would sense the increased flow and automatically shut the outlet isolation valve.

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12
Q

DESCRIBE the process of swapping CC pumps

A
  • Placing CC P 11C In Service And CC P 11A In Standby (OS1012.03)
  • As directed by US, PERFORM PCCW pump C prestarts. (Protected: Ref. 5.8)
  • START CC P 11C, PCCW PUMP C.
  • UNLOCK and CLOSE CC V 5, CC P 11A discharge isolation.
  • STOP CC P 11A, PCCW PUMP A, and ALLOW control switch to return to AUTO.
  • OPEN and LOCK CC V 5, CC P 11A discharge isolation.
  • Independently VERIFY CC V 5, CC P 11A discharge isolation, is locked open.
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13
Q 
DESCRIBE the automatic responses of each CC loop to the following signals:
"T"
"P"
Low Head Tank
Low-Low Head Tank
A

“T”-Isolates non essential loads outside containment. Supports initiation of CC to safeguards loads
“P”-Isolates containment to support CBS Heat Exchanger
Low Head Tank-Try to isolate leak!
Low-Low Head Tank-Try to isolate leak!

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14
Q

EXPLAIN the manual operation of the CC HX valve temperature controllers, and STATE the main reason for concern if the CC temperature control valve(s) are in manual

A
  • Accomplished by taking the controller out of auto by depressing the manual pushbutton on the M/A station at the MCB
  • Depress the desired output push buttons to change temperature
  • This will control both the HX output and bypass valves
  • Concerns
  • Temperature within the system will change as heat loads are added and removed.
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15
Q

EXPLAIN how to locally operate the CC HX temperature control valves.

A
  • Local Operator Aid
  • Turn H/W until red arrows on clutch plate face line up
  • Unscrew locking pin on clutch lever and engage clutch halves using lever-lock lever by screwing in pin
  • Immediately place manual / auto valve to manual position
  • Proceed with manual operation of valve using h/w
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16
Q

DESCRIBE the process of throttling CC flow to CCP oil coolers

A

Start counting turns once valve stem starts to move

systems test 3 (7 decks)

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