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Catawba Nuclear Station > Engineering Safeguard Actuation System(ISE) > Flashcards

Engineering Safeguard Actuation System(ISE) Flashcards

1
Q

What is the purpose of the Engineered Safety Features Actuation System?

A

The purpose of the Engineered Safety Features Actuation System(ESFAS) is to initiate action to protect the core and Reactor Coolant System components and ensure containment integrity in the event of an accident.

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2
Q

What is the system designator for the Engineered Safety Features Actuation System?

A

ISE

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3
Q

What is the design/purpose of the Input Bay?

A

Provides a signal to the Logic Cards in the Logic Bay. This is accomplished through the actuation of relay circuits based on input received from Process Protection Cabinet bistables.

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4
Q

What is the purpose of the Logic Bay?

A

The purpose of the Logic Bay is to provide input to the respective Master relay(s) located in the Output Bay if an ESF required logic is satisfied.

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5
Q

What are the two power supplies(voltage level) in the Logic Bay, and what do they provide power to?

A
  1. There are two 15VDC and two 48VDC power supplies in the Logic bay.
  2. The 15VDC power supply powers the logic cards
  3. The 48VDC power supply powers:
    A. The Reactor Trip Breaker undervoltage coils
    B. Master Relay Coils in the Output Bay
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6
Q

What is the purpose of the Output Bay?

A

The Output Bay energizes the required Slave Relays for actuation of the Engineered Safety Features.

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7
Q

What are the SSPS Cabinet Power Supplies ?

A

ERPA
ERPB
ERPC
ERPD

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8
Q

What does ERPA supply power to?

A
  1. Input Cabinet Train A, Channel 1
  2. Input Cabinet Train B, Channel 1
  3. Slave Relays Train A
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9
Q

What does ERPB supply power to?

A
  1. Input Cabinet Train A, Channel 2

2. Input Cabinet Train B, Channel 2

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10
Q

What does ERPC supply power to?

A
  1. Input Cabinet Train A, Channel 3

2. Input Cabinet Train B, Channel 3

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11
Q

What does ERPD supply power to?

A
  1. Input Cabinet Train A, Channel 4
  2. Input Cabinet Train B, Channel 4
  3. Slave Relays Train B
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12
Q

What are the Safety Injection Signals?

A
  1. Manual
  2. Pressurizer pressure less 1845psig
  3. Containment pressure high greater than or equal to 1.2psig
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13
Q

What are the Phase ‘A’ Isolation signals?

A
  1. Manual

2. Safety Injection

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14
Q

What are the Phase ‘B’ Isolation Signals?

A
  1. Manual

2. Hi-Hi Containment pressure - greater than or equal to 3.0psig

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15
Q

What are the Containment Ventilation Isolation Signals?

A
  1. Manual Phase ‘A’
  2. Manual Phase ‘B’
  3. Safety Injection Signal
  4. EMF-38, or EMF-39L trip 2(high containment particulate or gas)
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16
Q

What are the Feedwater Isolation signals?

A
  1. Manual
  2. Safety Injection
  3. Hi-Hi Steam Generator level
    A. Unit 1 - 83.9%
    B. Unit 2 - 77.1%
  4. Low Tave coincident with a Reactor Trip - less than 564F and reactor trip
17
Q

What are the Main Steam Isolation Signals?

A
  1. Manual
  2. Hi-Hi Containment pressure - greater than or equal to 3.0psig
  3. Low Main Steam Line pressure - 775psig
  4. High Steam Pressure Rate of Decrease - greater than or equal to 100psig/second up to 2psig/second for 250 seconds
18
Q

What are the functions relying on ESFAS?

A
  1. A reactor trip will be generated, provided one has not already been generated by the reactor trip system
  2. NV, NI, and ND pumps, and associated valves which provide emergency makeup water to the cold legs of the NC system following a LOCA
  3. KC pumps which provide cooling water to the ND heat exchangers
  4. RN pumps which provide cooling water to the KC heat exchangers
  5. Motor driven CA pumps, CAPT
  6. Feedwater isolation to prevent excessive cooldown
  7. Phase ‘A’ Containment Isolation
  8. Main Steam Isolation to prevent continuous uncontrolled blowdown thereby preventing an uncontrolled cooldown
  9. Diesel Generators assure backup supply of power
  10. VE system actuation to maintain a negative pressure in the Annulus
  11. Containment Ventilation Isolation to prevent spread of radioactivity
  12. Containment Air Return Fans and NS pump to reduce pressure
  13. Phase ‘B’ Containment Isolation
  14. VA system aligns to the filtered exhaust

Catawba Nuclear Station (72 decks)

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