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4703 > ECCS > Flashcards

ECCS Flashcards

1
Q

What are the ECCS Injection order with pressures?

A
  • CCP 2300#
  • SI Pumps 1600#
  • Accumulators 600#
  • RHR Pumps 200#
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2
Q

What does 10CFR50.46 state?

A
  • Peak clad temp < 2200°F
  • Max cladding oxidation < 17%
  • H2 concentration < 1%
  • Core maintains cool able geometry
  • Long term cooling provided
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3
Q

When does the ECCS injection phase end?

A
  • Injection phase ends when RWST reaches low level (20%) and transfer to Recirc Sump
    -Water level in Recirc Sump must be at least
    602’-2 3/4”
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4
Q

What is the RWST Tech Spec Limit?

A
  • 375,500 gallons - 1 Hr spec
  • 2400-2600 ppm boron con - 8 Hr spec
  • 70-100°F - 8 Hr Spec
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5
Q

When are the accumulators outlet valves open and deenergized?

A
  • Modes 1-2 and Mode 3 when Pzr # > 1000#
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6
Q

When do the accumulator outlets get an open signal?

A
  • SI sends signal to open outlet valves (IMO-110 thru IMO-140) to ensure any close valves will open
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7
Q

How many accumulators are necessary to inject into the core? (FSAR Assumption)?

A
  • 3 accumulators contain enough borated water to fill volume outside of the reactor core barrel, below nozzles, bottom plenum, and portion of the core* (Assumes one falls to the floor)
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8
Q

What are the SI pump auto starts?

A
  • SI

- Load Shed with SI (7 seconds)

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9
Q

What are the SI pump trips?

A
  • Load Shed

- Overload/Overcurrent

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10
Q

What is the runout flow of the SI Pump?

A
  • 700 gpm
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11
Q

When do IMO-262 and IMO-263 (SI Pump to RWST recirc valves) auto open?

A
  • Open on injection phase
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12
Q

When do IMO-262 and IMO-263 (SI Pump to RWST recirc valves) auto close?

A
  • Closed for cold leg recirc to prevent pumping recirc sump to RWST
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13
Q

When are IMO-270 and IMO-275 (SI train x-tires) normally open and when are they closed?

A
  • Normally open to provide 4 loop injection on 1 SI Pump failure
  • Closed during cold leg recirc
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14
Q

What will give you an SI signal?

A
  • Pzr # Low - 1775# (2/3)
  • Containment # High - 1.0# (2/3)
  • S/G # Low - 500# (1/1 on 2 S/G)
  • 1 S/G 100# ΔP lower than 2 others (2/3)
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15
Q

What is the RWST Tech Spec Basis?

A
  • Level 375,500 gal - min level for recirc sump
  • Temp 70°F - Lower ΔP rcs vs cntmt - backpressure
  • Temp 100°F - Prevents Peak # in Ctmnt to < 12#
  • Boron > 2400 ppm - ensure subcriticality
  • Boron < 2600 ppm – max time to HL recirc
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16
Q

When do you align Hot Leg Recirc?

A
  • Align before 7.5 hrs after the LOCA. (Prevent boron precipitation in the reactor)
17
Q

When do you NOT align Hot Leg Recirc?

A
  • Do NOT align < 5.5 hours after the LOCA. (Avoid core uncovery due to boil off)
18
Q

When do we initiate RHR Spray after an accident and when is in required/not required?

A
  • RHR Spray not initiated until > 50 min after accident (ensures adequate injection for decay heat removal)
  • If < 2 CTS running RHR Spray must be I/S in 75 minutes (limits can # and keeps CR dose < 5 rem TEDE.)
  • required for 6 hours after LBLOCA
  • not required if containment # < 1.5#
19
Q

What is the ECCS Leakage limits for CR habitability?

A
  • Total unfiltered leakage from Recirc Loop < 0.1 gpm for Control Room dose and < 2.0 gpm for containment sump water level analysis
  • Filtered- Means there is communication with AES Fan.
20
Q

What does TS 3.5.1 (Accumulators) state?

A
  • If 2 or more accumulators are inoperable in Modes 1-3 with RCS Pressure > 1000#
    IMMEDIATELY
  • enter LCO 3.0.3
21
Q

What does TS 3.5.2 (ECCS, operating) state?

A
  • If 1 of the ECCS flow is < 100% equivelant to a single Operable ECCS train available for reasons other than having 1 or more SI Systems x-tie valves closed
    IMMEDIATELY
  • enter LCO 3.0.3

(3.5.2.1 Train - CCP, SI and RHR)

22
Q

What does TS 3.5.3 (ECCS, Shutdown) state?

A
  • If Required ECCS Train (RHR or CCP) subsystem inoperable in Mode 4
    IMMEDIATELY
  • enter Initiate action to restore required ECCS RHR/CCP subsystem to OPERABLE status
23
Q

What does TS 3.5.4 (RWST) state?

A
  • If the RWST is inoperable for reasons other than boron concen or temp then
    WITH IN 1 Hr
  • restore RWST to OPERABLE status.
24
Q

What are the Accumulator parameters?

A
  • Volume 921-971 cuft
  • 585-658#
  • 2400-2600 ppm Boron

4703 (11 decks)

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