Systems Test 3 > LOT 201.10 ECCS > Flashcards

LOT 201.10 ECCS Flashcards

(16 cards)

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1
Q
  • LOT 201.10 ECCS*
    • *

What are the Emergency Core Cooling System (ECCS) acceptance criteria?

A

Coolable Geometry

Long-Term cooling

Cladding Oxidation
≤ 17% the total cladding thickness before oxidation.

  • *Peak Cladding Temperature**
  • ≤ 2200 ˚F*
  • *H2 Generation**
  • ≤ 1% the total amount of H2 produced from all metal surrounding the fuel reacting*
  • (excludes metal around plenum volume)*

DBAs:

  • LOCA
  • SLB
  • Fuel Handling Accident
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2
Q
  • LOT 201.10 ECCS*
    • *

What fills/drains the accumulators?

A 
# *_Fill:_*
HHSI
  • Drain:*
  • *RWST**
  • *RCDT (Spoolpiece)**
  • Complete Draining*
  • *Primary Sampling**
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3
Q
  • LOT 201.10 ECCS*
    • *

In order for the RWST to be OPERABLE in MODES 1 - 4, what must water volume and boron concentration be?

A

≥ 458,000 gallons

2800 ppm - 3000 ppm

LCO 3.5.5 RWST

Applicable: MODES 1 - 4

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4
Q
  • LOT 201.10 ECCS*
    • *

In order for the accumulators to be OPERABLE in MODES 1 - 3 w/ PZR pressure > 1000 psig, what must water volume and boron concentration be?

A
  • Water Volume:*
  • *8800 gal - 9100 gal**
  • Boron Concentration:*
  • *2700 ppm - 3000 ppm**

LCO 3.5.1 Accumulators

Applicable: MODES 1 - 3

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5
Q
  • LOT 201.10 ECCS*
    • *

What valves in the ECCS have a power lockout feature?

A
  • *HHSI/LHSI Hot leg injection valves (MOV-008/MOV-019)**
  • 100% Power: Closed w/ power locked out*
  • CP-001*
  • *Accumulator outlet valves (MOV-039)**
  • 100% Power: Open w/ power locked out*
  • CP-001 / ASP*

No accumulator pressure / level indicators exist on ASP!!

  • Note:*
  • 2 transfer switches for accumulator outlet valves. 1 transfers control and VPI and the other transfers power lockout feature.*
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6
Q
  • LOT 201.10 ECCS*
    • *

What will auto open the accumulator discharge valve? (MOV-039)

A

SI

  • *RCS Pressure ≥ P-11**
  • PZR Pressure ≥ 1985 psig [2/3]*
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7
Q
  • LOT 201.10 ECCS*
    • *

How do you place ECCS in-service during a plant heatup from cold shutdown?

A
  • Mode 5:*
  • *ALL HHSI pumps inoperable**
  • *SI not blocked**
  • Before Entering MODE 4:*
  • *Open ALL HHSI CL injection valves**
  • *2 trains of LHSI OPERABLE**
  • Within 4 hrs of going > 200 ˚F and before exceeding 225 ˚F:*
  • *1 HHSI OPERABLE and 1 HHSI in Standby**
  • Before Entering MODE 3 (350 ˚F):*
  • *ALL LHSI OPERABLE**
  • Within 4 hrs of going > 350 ˚F and before exceeding 375 ˚F:*
  • *ALL HHSI OPERABLE**
  • 900 psig - 1000 psig:*
  • *ALL Acummulators OPERABLE**
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8
Q
  • LOT 201.10 ECCS*
    • *

At what RCS pressures will the ECCS Accumulators, HHSI pumps, and LHSI pumps inject into the RCS Cold Legs?

A
  • HHSI:*
  • *< 1600 psig**
  • Accumulators:*
  • *590 - 670 psig**
  • LHSI:*
  • *< 300 psig**

Receive water from RWST.

  • Note:*
  • During DBA, Accumulators will inject 1st.*
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9
Q
  • LOT 201.10 ECCS*
    • *

Where does HHSI and LHSI mini-flow valves discharge to?

A

RWST

Close on SI auto recirculation signal

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10
Q
  • LOT 201.10 ECCS*
    • *

Which valves will not be able to be manually opened if the respective train’s Emergency Sump Outlet Valve (MOV-016) is open?

A

HHSI Mini-Flow Valves (MOV-011/MOV-012)

LHSI Mini-Flow Valves (MOV-013/MOV-014)

RWST Outlet Valves (MOV-001)

To manually open Emergency Sump Outlet Valve:

  • RWST Outlet Valve closed (Manual Only)
  • HHSI Mini-Flow Valve closed [1/2]
  • LHSI Mini-Flow Valve closed [1/2]
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11
Q
  • LOT 201.10 ECCS*
    • *

What are the four phases of a DBA LOCA?

A
  • *Blowdown**
  • Begins with LOCA and ends with RCS pressure = CTMT pressure*
  • *Refill**
  • Water at bottom of the reactor vessel and reaches the bottom of the fuel rods via addition of ECCS (Accumulators and SI pumps).*
  • *Reflood**
  • Rx vessel filled with water*
  • Core temperature rise has terminated*
  • Core temperatures have been reduced to their long term steady state level.*
  • *Long Term Recirculation**
  • Cold Leg Recirc (1st Phase)*
  • Hot Leg Recirc (2nd Phase)*
  • Hot Leg Recirc starts 5.5 hrs (Operator Action) after start of LOCA and cools upper head and prevents boron precipitation.*
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12
Q
  • LOT 201.10 ECCS*
    • *

What is the system lineup during hot leg recirc?

A

2 ECCS trains injecting into Hot Legs

1 ECCS train injecting into Cold Leg

LHSI and HHSI mini-flow valves closed

Taking Suction from Emergency Sumps

HHSI and LHSI are operated together. Never align HHSI to Hot leg and LHSI to Cold leg or vice versa.

  • Note:*
  • Cold Leg Recirc is the exact same except all 3 ECCS trains injecting into cold legs.*
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13
Q
  • LOT 201.10 ECCS*
    • *

What will cause an SI auto recirculation signal?

A

SI Signal

AND

  • *RWST Level - Low 2 (≤ 75,000 gal) [1/1]**
  • Each lvl switch provides signal for it’s train only*

Closes HHSI AND LHSI pump mini-flow valves.

When ≥ 1 valve for each pump closed:

  • Opens containment sump → SI suction header Isolation valve.

RWST → SI suction header isolation valve must be manually closed by operator. (CP001)

  • Note:*
  • Reset and RWST lvl indication are located on CP001*
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14
Q
  • LOT 201.10 ECCS*
    • *

What cools the HHSI/LHSI upper and lower bearings?

A

Resevoir Oil Baths

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15
Q
  • LOT 201.10 ECCS*
    • *

When must all HHSI pumps be inoperable per tech specs?

A
  • *MODE 5**
  • *MODE 6 w/ Rx Vessel Head on**

LCO 3.5.3.2 ECCS Subsytems - Tavg ≤ 200 ˚F

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16
Q
  • LOT 201.10 ECCS*
    • *

When does the accumulator relief lift?

Study These Flashcards
A

700 psig

Relieves to Containment Atmosphere

  • HHSI Discharge Relief (1750 psig) → PRT
  • LHSI Discharge Relief (600 psig) → PRT
Systems Test 3
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