Engineered Safeguards Flashcards

1
Q

ECCS acceptance Criteria

HOTCC

A
  • H2 production <1%
  • Oxidation <17%
  • Temperature of cladding <2200 degrees
  • Coolable geometry
  • Cooling long-term
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2
Q

SI block with pressure

A

When less than 2000psig
Low Pressure in PZR (1715psig)
Hi Steam Line D/P (100psig)

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3
Q

SI block with Tave

A

When 543 degrees
Hi Steam line flow
Hi-Hi CV pressure

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4
Q

Actions caused by SI

SPARE FCCC

A
  • Safegaurd sequence Actuation
  • Phase A and IVSW
  • AFW Autostart
  • Reactor Trip
  • EDGs
  • Feedwater Isolation
  • CV ventilation isolation
  • Control Room Pressurization
  • Close Normal dampers on HVH-1-4
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5
Q

Resetting auto SI signal

A
  • If SI reset button pressed before 2 mins, 2 minutes must pass from time of signal before EDG white light extinquish and SI is reset
  • If Si reset button pressed after 2 mins then there is no wait
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6
Q

Resetting Manual SI

A

Must wait 2 minutes before pressing reset button. Unlike Auto signal the button cannot be pressed before 2 minutes.

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7
Q

Do components reposition after a SI signal is reset?

A

No, components do not reset

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8
Q

What signals must be reset individually?

A

Phase A
Phase B
HVH dampers
IVSW
CV ventilation isolation
Feedwater isolation

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9
Q

SI valves

which reposition

A

SI-867 A/B BIT inlets open
SI-870 A/B BIT outlets Open-Move
SI-841 A/B BIT Recirc to RWST Closed
SI-865 A/B/C Accumulator Oulets open
RHR-747 A/B RHR cold leg injection Open-Move

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10
Q

Interposing Relays are powered from?

A

IB-7A Train A
IB-3 Train B

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11
Q

Automatic Spray signal does what?

A
  • Spray Actuation
  • Phase B
  • SI signal
  • Steam Line Isolation
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12
Q

Manual Spray signal does what?

A
  • Spray Actuation 2/2
  • Phase B
  • CV Ventilaition Isolation
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13
Q

CV Ventilation Isolation does what?

A

Shuts
CV Purge Valves
Pressure Relief Valves
Vacuum Relief Valves

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14
Q

Phase B valves

A

CC-716A-CC to RCP A/B/C and CRD Cool isolation
CC-716B-CC to RCP A/B/C and CRD Cool Isolation
cvc-381- RCP Seal Water Return
CC-735- CC from RCP A/B/C thermal barrier isolation
CC-730- CC from RCP A/B/C oil cool isolation
FCV-626- CC From RCP A/B/C thermal Barrier isolation

CCW to Containment basically

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15
Q

Steam Line isolation SI singals

A

Hi-Hi CV pressure (10psig)
High Steam Flow with Low stm line press or low tavg

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16
Q

Steam LIne Isolation is what?

A

Closure of MSIVs

17
Q

Feedwater Isolations

A
  • Reactor Trip with Tavg <554
  • Hi-Hi SG lvl (2/3 on 1/3 @ 75%)
  • SI Actuation
18
Q

Reactor Trip with Tavg <554 degrees does what to feedwater?

A

Shuts all FRVs

19
Q

Hi-Hi S/G Level does what to feedwater?

A
  • Shuts FRV and FRV Bypass for respective S/G
  • Trips both MFPs
  • Trips the Turbine
20
Q

SI actuation does what to Feedwater?

A
  • Shuts all FRV, FRV bypass, and FRV Block
  • Trips both MFPs
  • Trips the Turbine
21
Q
A