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Catawba Nuclear Station > Safety Injection(NI) > Flashcards

Safety Injection(NI) Flashcards

1
Q

What is the purpose of the Safety Injection System?

A
  1. Provides emergency core cooling for loss of coolant accidents that cause primary coolant pressure to drop below the shut-off head of the pumps.
  2. Provides borated water to the core in the event of a steam line break to maintain core shutdown margin.
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2
Q

What is the system designator for the Safety Injection System?

A

NI

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3
Q

What is the design/purpose of the Safety Injection Pumps?

A
  1. Two redundant, 100% capacity pumps
  2. Perform the following functions:
    A. Deliver borated water from the Refueling Water Storage Tank during the injection phase
    B. Deliver containment sump water during the recirculation phase
    C. Fill the Cold Leg Accumulators(CLA)
  3. Normally aligned for cold leg injection Safety Injection - no valves need to reposition to inject flow
  4. Capable of injecting to the Hot Legs
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4
Q

What is the approximate shutoff head of the Safety Injection Pumps?

A

1520psig

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5
Q

What is the status of the Refueling Water Storage Tank to Safety Injection Pump Suction Isolation Valve(NI-100B) during normal operation?

A

NI-100B is normally open with power removed to prevent inadvertent closure.

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6
Q

What is the status of the Refueling Water Storage Tank to Safety Injection Pump Suction Isolation Valve(NI-100B) during the recirculation phase of ECCS operation?

A

NI-100B is manually closed during the recirculation phase to prevent:

  1. Possible contamination of the FWST by the reactor coolant
  2. Loss of NI pump suction due to diversion of flow to the FWST
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7
Q

What is the status of the Refueling Water Storage Tank to Safety Injection Pump Suction Isolation Valves(NI-103A and NI-135B) during normal operation?

A
  1. NI-103A and NI-135B are normally open valves
  2. Both valves are open during the injection and recirculation phase of ECCS operation
  3. Open during the recirculation phase to ensure either Residual Heat Removal Pump can supply either Safety Injection Pump or Centrifugal Charging Pump
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8
Q

What is the setpoint for the Safety Injection Suction Relief(NI-102), and where does it relieve to?

A
  1. 220psig

2. Discharges to the Recycle Holdup Tank(RHT)

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9
Q

What is the status of the Residual Heat Removal Supply Valves to the Safety Injection Pump and Centrifugal Charging Pumps Valves(NI-28 and NI-136B) during normal operation?

A
  1. Normally closed valves
  2. Closed during the injection phase of ECCS operation
  3. Opened for both the Cold Leg Recirculation and Hot Leg Recirculation modes
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10
Q

What is required to open the Residual Heat Removal Supply Valves to the Safety Injection Pump and Centrifugal Charging Pumps Valves(NI-28 and NI-136B)?

A
  1. Associated ND pump aligned to the sump
  2. Associated DN pump is isolated from the applicable Hot Leg
  3. NI pump minimum flow lines are isolated
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11
Q

What is the status of the Safety Injection Pump/Centrifugal Charging Pump Suction Crossover Isolation Valves(NI-332A and NI-333B) during normal operation?

A
  1. Normally closed valves
  2. Remain closed during the injection phase
  3. Opened during both Cold Leg Recirculation and Hot Leg Recirculation modes for redundancy of suction source for NV and NI
  4. In parallel so that loss of power to either train, or valve failure, will not impair the flow path
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12
Q

What is the status of the Safety Injection Pump/Centrifugal Charging Pump ????????(NI-334) during normal operation?

A
  1. NI-334 is normally open and remains open for all phases

2. May be manually closed for isolation in the even of a NI-332A or NI-333B failure

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13
Q

What is the status of the Safety Injection Pump Minimum Flow Valves(NI-115A and NI-144A) during normal operation?

A
  1. Normally open to protect the NI pumps from deadheading when reactor coolant pressure is above their shutoff head
  2. Only closed during the recirculation phase to prevent possible contamination of the FWST
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14
Q

What is the required minimum flow for the Safety Injection Pumps?

A

45gpm

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15
Q

What is the status of the Safety Injection Pump ????????(NI-147B) during normal operation?

A
  1. Normally opened with power removed

2. Closed during Cold Leg Recirculation and Hot Leg Recirculation to prevent contamination of the FWST

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16
Q

What is the setpoint for the Safety Injection Discharge Relief Valves(NI-119 and NI-151), and where do they relieve to?

A
  1. 1900psig

2. They relieve to the Recycle Holdup Tank(RHT)

17
Q

What do the Safety Injection Discharge Relief Valves protect the system from?

A

The discharge relieve valves protect the discharge side piping from overpressure caused by a leaking reactor coolant loop hot leg check valve

18
Q

What is the status of the Cold Leg Accumulator Fill Line Isolation Valve(NI-120B) during normal operation?

A
  1. NI-120B is normally closed

2. Receives a Phase ‘A’ Isolation signal to prevent a release after an accident

19
Q

What is the status of the Cold Leg Injection Line Valves(NI-118A, NI-162A, and NI-150B) during normal operation?

A
  1. NI-118A and NI-150B are normally open during the injection phase as well as Cold Leg Recirculation, but closed for Hot Leg Recirculation
  2. NI-162A is normally opened with power removed for the injection phase as well as Cold Leg Recirculation, but closed for the Hot Leg Recirculation Phase
20
Q

What is the status of the globe valves located in the Cold Leg Injection Lines?

A

The globe valves in the Cold Leg Injection Lines are locked throttled as determined by the ECCS flow balance test to:

  1. Prevent runout of the Safety Injection Pumps
  2. Equalizes flow to the loops
21
Q

What is the status of the Hot Leg Injection Line Isolation Valves(NI-121A and NI-152B) during normal operation?

A
  1. The Hot Leg Injection Line Isolation valves are normally closed.
  2. They remain closed during the Injection Phase and Cold Leg Recirculation, but are opened for Hot Leg Recirculation
22
Q

What are the Safety Injection Pump power supplies?

A

A - ETA

B - ETB

23
Q

What is the system interrelationship with the Refueling Water System(FW)?

A
  1. The FWST provides the emergency suction source for the Safety Injection Pumps
  2. Safety Injection Pump recirculation lines also return to the FWST
24
Q

What is the system interrelationship with the Residual Heat Removal System(ND)?

A

The ND system provides the suction source to the NI pumps during Cold Leg Recirculation. This flow path is manually aligned when directed by emergency procedures

25
Q

What is the system interrelationship with the Component Cooling Water System(KC)?

A

The Component Cooling Water System provides cooling for the NI Pump Auxiliary Oil System and NI Pump Motor Cooler

26
Q

What is the system interrelationship with the Containment Valve Injection Water System(NW)?

A

The NW system provides pressurized water between some of the NI system double disc gate valves to prevent leakage

27
Q

What is the mission time of the Safety Injection System?

A

30 days

28
Q

What signals will automatically start the Safety Injection Pumps?

A
  1. Less than 1845psig in the Pressurizer(train related)
  2. Containment pressure greater than 1.2psig(train related)
  3. Manual
29
Q

What is a general sequence of events for Safety Injection?

A
  1. NI in standby with pumps off
  2. All MOVs are positioned to allow cold leg injection
    * Safety Injection Signal Received
  3. Both NI Pumps are running with minimum flow aligned to the FWST
  4. All MOVs are in their original safeguards positions
  5. NI Pumps inject when NC pressure is less than 1520psig
  6. Cold Leg Accumulators inject when NC pressure is less than CLA nitrogen pressure(normally 600psig)

Catawba Nuclear Station (72 decks)

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