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Operator Knowledge > Residual Heat Removal > Flashcards

Residual Heat Removal Flashcards

1
Q

What are the Safety Related functions of RHR?

A
  • Transfer heat from the RCS to the CCW system via the RHR HX’s. (Forced cooldown)
  • Used as a part of ECCS.
  • Used as a part of CTS.
  • Provides RCS LTOP during shutdown conditions. (450# relief)
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2
Q

What are the RHR pump auto starts?

A
  • SI (Train Specific)
  • Load shed with SI (Train Specific)
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3
Q

What are the RHR pump trips?

A
  • Load shed
  • RWST Lo-Lo (9.6%) with respective suction valve open (IMO-310/320)
  • Overcurrent
  • Overload
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4
Q

What are the requirements to open IMO-128/ICM-129? (RCS Loop 2 Hot Leg to RHR Suction)

A

To open these valves, RCS # must be < 410#
- NPS-122 -> IMO-128
- NPS-121 -> ICM-129

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5
Q

What is the setpoint for SV-103 (RHR Suction relief valve) and what is its purpose?

A
  • 450# at 900gpm
  • Provides LTOP and RHR suction overpressure protection
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6
Q

What is the setpoint for IMO-312/322? (RHR pump recirc valves)

A

Open and Close:
- Unit 1: 820gpm and 1335gpm
- Unit 2: 900gpm and 1500gpm

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7
Q

What are the fail positions for the air operated valves in the RHR system?

A
  • IRV-311 (RHR HX Bypass Flow Control Vlv) -> Fail Open
  • IRV-310/320 (RHR HX Outlet Recirc Line Shutoff) -> Fail Open
  • IRV-300 (RHR HX to CVCS Demin Shutoff) -> Fail Closed
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8
Q

What is ICM-305/306?

A

Recirc Sump to RHR/CTS Pump Suction Valves

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9
Q

What is IMO-340/350?

A

East/West RHR HX to CCP/SI Pump Suction Valves.

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10
Q

What is IMO-330/331?

A

East/West RHR Spray Supply Valves

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11
Q

What is IMO-310/320?

A

East/West RHR Pump Suction Valves

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12
Q

What is IMO-215/225?

A

RWST to East/West CTS Pump Suction Valves

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13
Q

What is IMO-262 and -263?

A

CCP to SI Pump Suction X-Connect Valves

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14
Q

What are the interlocks to open ICM-305/306?

A
  • IMO-310/320 Closed
  • IMO-215/225 Closed
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15
Q

What are the interlocks to open IMO-340/350?

A
  • ICM-305/306 Open
  • IMO-262 OR 263 Closed
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16
Q

What are the interlocks to open IMO-330/331?

A
  • ICM-305/306 Open
17
Q

What are the interlocks to open IMO-310/320?

A
  • ICM-305/306 Closed
  • IMO-340/350 Closed
  • IMO-330/331 Closed
18
Q

What prevents dead heading an RHR pump (weak pump) during the injection phase following a LOCA?

A

Check valves between the tee for the RHR pump recirc valve and the tee for RHR spray and IRV-310/320.

19
Q

What level is Reduced Inventory?

A

618’ 1.5”

20
Q

What level is Mid Loop?

A

614’

21
Q

What does Hot Leg Recirc do for the RCS?

A

Prevents boron precipitation is the RX Vessel.

22
Q

When can RHR be placed in service following a RX Shutdown?

A
  • RCS# less than or equal to 400#
  • RCS Temp < 350F
23
Q

What are the time restrictions for transferring to Hot Leg Recirc and why?

A
  • Minimum: 5.5 Hours, to avoid core uncovery due to high decay heat.
  • Maximum: 7.5 Hours, to prevent boron precipitation in the RX vessel head.
24
Q

Why must RHR Loop Injection Valves be closed prior to aligning RHR Spray?

A

Prevent RHR pump run-out.

25
Q

How many RHR pumps can be ran at Reduced Inventory and why?

A
  • One
  • Prevents air entrapment due to vortexing at the suction.
26
Q

Upon SI, what does the CCW outlet of the RHR HX throttle to? (CMO-419/429)

A

3000-3500 gpm

27
Q

What is the purpose of Hot Sleeve Fans?

A

Cools concrete around containment penetrations to prevent dryout.

28
Q

What is the LCO requirement for RCS Loops in MODE 4? (LCO 3.4.6)

A

Two loops consisting of any combination of RCS loops and RHR loops shall be OPERABLE, and one loop shall be in operation.

29
Q

What 1 hour or less actions are required if one required tech spec loop is INOPERABLE while in MODE 4?

A
  • Initiate action to restore a second loop IMMEDIATELY.
30
Q

What 1 hour or less actions are required if two required tech spec loops are inoperable OR the required loop is not in operation?

A
  • Suspend ops that would cause introduction of coolant < required boron concentration IMMEDIATELY
    AND
  • Initiate action to restore one loop to OPERABLE status and operation IMMEDIATELY
31
Q

What is the LCO requirement for RCS Loops in MODE 5, Loops Filled? (LCO 3.4.7)

A

One RHR loop shall be OPERABLE and in operation, and either:
- One additional RHR loop shall be operable
OR
- SGWL of 2 S/G’s shall be above the lower tap of the wide range instrumentation by greater than or equal to 420 inches.

32
Q

What is the LCO requirement for RCS Loops in MODE 5, Loops NOT Filled? (LCO 3.4.8)

A

Two RHR loops shall be OPERABLE and one RHR loop shall be in service.

Operator Knowledge (17 decks)

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