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1. Systems > RCS > Flashcards

RCS Flashcards

1
Q

Where are the thermal sleeves located in the RCS?

A
  • Charging to Loops 1 and 4 CLs
  • RHR Normal Cooldown lines to Loops 2 and 3 CLs
  • Pzr Surge Line – Both Ends
  • Pzr Spray Line at Pzr
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2
Q

What are the RCS penetrations below centerline?

A
  • RHR Suction from Loop 2 Hot Leg ***
  • Loop flow instruments (High Side Tap)
  • Drain Lines
  • NR Thot Scoops
  • Half Loop level indication connection (NLI-122)
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3
Q

What loops does Pzr spray come from?

A
  • loops 3 and 4 CLs **
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4
Q

What loops have RVLIS penetrations?

A
  • loops 1 and 3 HLs
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5
Q

What loops have Sample penetrations?

A
  • loops 1 and 3 HLs
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6
Q

What loops have Mid Loop Level Indicator penetrations? **

A
  • Loop 2 (NLI-122) hot leg

- Loops 3 and 4 Intermediate legs ***

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7
Q

What loop has Pzr Surge line penetration?

A
  • loop 3 HL**
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8
Q

What loop has RHR suction penetration? **

A
  • loop 2 HL ** (Does not extend into Pipe**)
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9
Q

What loop has NLI-122 half loop indicator penetration? **

A
  • loop 2 HL **
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10
Q

What loop has ExLD line penetration?

A
  • loop 4 CL
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11
Q

What loop has Normal Charging penetration?

A
  • loop 4 CL **
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12
Q

What loop has alternate charging penetration?

A
  • loop 1 CL
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13
Q

What loop has normal LD penetration?

A
  • Loop 4 CL (Intermediate Leg)
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14
Q

What is the design basis of the Rx Vessel Head Vent?

A
  • vent a volume of h2 equal to half the volume of the RCS in 1 hr at system design # and temp
  • 0.25” orifice prevents leakage > capacity of 1 CCP ***
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15
Q

When is RVLIS for Narrow Range Used?

A
  • No RCPs running **
  • Top to bottom of vessel
    100% = Full
    70% = Top of Hot Leg (N/C)
    67% = Top of Fuel
    46% = 3.5ft above bottom of fuel
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16
Q

When is RVLIS for Wide Range Used?

A
  • With RCPs running **
  • Looks for Void Fraction (50%)
    46% w/4 RCPs
    32% w/3 RCPs
    22% w/2 RCPs
    15% w/1 RCPs
  • If WR shows a higher number than table, void fraction is less than 50% and core would remain covered if RCP(s) were stopped
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17
Q

When is RVLIS for the Upper Range Used?

A
  • All RCPs Off **
  • top of Loop 1 HL and top of Rx vessel
    100% = Full **
    70% = Top of Hot Leg **
  • Generally used in EOPs to assess whether a RV head void exists for natural circulation cooldown procedures.
  • Fails when RCPs are running
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18
Q

What does Loose Parts Monitoring system do (DMIMS)?

A
  • Provides early detection of loose parts in the RCS that may occur as a result of material wear, component failure, or outage/maintenance work
  • Operating Control Rods will bypass the system (RV head)
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19
Q

Where does DMIMS look for loose parts?

A
  • Both sides SG tube sheet (8)
  • Reactor Vessel Head (2)
  • Bottom of Core (2)
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20
Q

What is the normal Tavg for both units?

A
  • Unit 1: 571ºF

- Unit 2: 574ºF

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21
Q

What is the normal Thot for both units?

A
  • Unit 1: 600ºF

- Unit 2: 607ºF

22
Q

What is the normal Tcold for both units?

A
  • Unit 1: 541ºF

- Unit 2: 541ºF

23
Q

What is the normal Core ΔT for both units?

A
  • Unit 1: 59ºF

- Unit 2: 66ºF

24
Q

What is the normal RCS # for both Units?

A
  • 2235#
25
Q

What is the fastest, per TS, that the RCS can be heated up? (3.4.3 A, RCS # vs Temp)

A
  • < 60ºF/Hr *
    WITHIN
  • 30 min to restore to this temp change rate or below this temp rate change ***
26
Q

What is the fastest, per TS, that the RCS can be cool down? (3.4.3 A, RCS # vs Temp)

A
  • < 100ºF/Hr *
    WITHIN
  • 30 min to restore to this temp rate change ***
27
Q

Where does the subcooling monitor meter get it readings from to do the calc?

A
  • Auctioneered HI CETCs or WR RTD temps
  • Auctioneered LO RVLIS press
  • RVLIS press is used (located outside containment) *****
28
Q

What does 3.4.2 A (RCS min temp) state?

A
  • If Tavg in one or more RCS
    loops not within limit (> 541ºF)
    WITHIN
    30 min, be in MODE 2 with keff < 1.0
29
Q

What does 3.4.6 A (RCS Loops, Mode 4) state?

A
  • In MODE 4, Two loops consisting of any combination of RCS loops and RHR loops shall be OPERABLE, and one loop shall be in operation
  • If one required loop becomes inoperable
    IMMEDIATELY
  • Initiate action to restore a second loop
30
Q

What does 3.4.7 A, B, C (RCS Loops, Mode 5 Loops Filled) state?

A

-In MODE 5, loops filled, 1 RHR loop operable and in operation + 1 more RHR loop OR 2 S/G water level 420” > WR operable

  • If any one of these is lost,
    IMMEDIATELY
  • initiate action to restore to operable
31
Q

What does 3.4.8 A (RCS Loops, Mode 5 Loops drained) state?

A
  • In Mode 5 + loops drained, Two RHR loops shall be OPERABLE and one
    RHR loop shall be in operation
- If One required RHR loop becomes inoperable
IMMEDIATELY
- Initiate action to restore
RHR loop to OPERABLE
status.
32
Q

What’s the purpose of RVLIS?

A
  • Verify adequate core cooling exists during accident
  • Inputs to subcooling monitor
  • Determines when Accumulators should be isolated to prevent nitrogen injection to RCS.
  • Can be used for Reactor Vessel Heat fill and vent.
33
Q

Which RVLIS correlation do you use when filling and venting RCS?

A
  • Use UPPER Plenum RVLIS with RCPs off when filling and venting RCS with RCP bump method
34
Q

What are the RCS leakage limits? (TS 3.4.13)?

A
  • RCS operational LEAKAGE shall be limited to:
    • NO pressure boundary
    • 0.8 (1.0) gpm unidentified
    • 10 gpm identified
    • 150 gal/day for 1 S/G
35
Q

What are the RCS leak detections in containment?

A
  • Required to detect a 1 gpm leak within 4 hours ***
  • Containment Sump Pumps
  • Particulate Rad Monitor (Unit 1) – most sensitive for small leaks
  • Humidity or Gaseous Rad Monitor
36
Q

What loops have WR # on them?

A
  • Loops 1 and 2 HLs
37
Q

Which loops have the NR Thot Scoops?

A
  • All Loops HLs
38
Q

Which loops have the WR RTD Thermowells?

A
  • All Loops HLs
39
Q

Which loops have the WR RTDs?

A
  • All Loops CLs
40
Q

Which loops have the NR RTDs?

A
  • All Loops CLs
41
Q

Which loops have the RCS Flow Meter Taps?

A
  • All Loops Intermediate Legs
42
Q

Which loops have the RCS drains?

A
  • All Loops CL Intermediate Legs
43
Q

Given the following:

  • Unit 1 is operating at 60% power
  • Loop 3 Delta-T indication fails LOW
  • Loop 3 Tavg indication fails HIGH

Which ONE of the following failures is the cause for these indications?

A. Thot failed high

B. Tcold failed high

C. Thot failed low

D. Tcold failed low

A
  • B. Tcold failed high
44
Q

The Unit 2 Reactor Operator has just discovered that while performing 02-OHP-4030-203-052L, Controlled Leakage Verification Test the seal line resistance was determined to be 2.13E-1 ft/gpm2.

Technical Specification requires a value of greater than or equal to 2.27E-1 ft/gpm2.

Which ONE of the following describes the impact this seal line resistance would have on the RCS should a small break LOCA occur? (based on accident analysis assumptions)

A. Auxiliary Spray flow may be less than required for RCS depressurization.

B. Seal Injection flow may be insufficient to the cool the seals in the event of a Thermal barrier rupture.

C. Charging Pump minimum flow may be less than required for pump cooling.

D. Boron Injection Tank flow may be less than required for core cooling.

A
  • D. Boron Injection Tank flow may be less than required for core cooling.
45
Q

Technical Specification 3.4.6, RCS Loops - Mode 4, requires that a minimum of two reactor coolant loops or RHR loops be operable at all times.

The basis for this requirement is that two loops are:

A. the minimum number required to ensure adequate shutdown margin.

B. the minimum number required to remove decay heat.

C. required to ensure the one loop required to remove decay heat is available in the event of a single failure.

D. required to ensure adequate shutdown margin in the event of a single failure.

A

C. required to ensure the one loop required to remove decay heat is available in the event of a single failure.

46
Q

Which ONE of the following, in addition to the Core Exit Thermocouples, describes the inputs to the RCS Subcooling Margin Monitor?

A. RCS Hot Leg Wide Range Pressure (NPS-121/122) RCS Narrow Range RTDs

B. RCS Hot Leg Wide Range Pressure (NPS-121/122) RCS Wide Range RTDs

C. RVLIS Wide Range Pressure (NPS-110/111) RCS Narrow Range RTDs

D. RVLIS Wide Range Pressure (NPS-110/111) RCS Wide Range RTDs

A
  • D. RVLIS Wide Range Pressure (NPS-110/111) RCS Wide Range RTDs
47
Q

Given the following plant conditions:

The Plant is in HOT STANDBY (MODE 3)
Plant COOLDOWN from HOT STANDBY to COLD SHUTDOWN (MODE 5) will begin within the next half hour

How many RCPs MUST be in operation with Tavg > 541°F and why?

A. 4; To ensure the required Tavg instruments are operable.

B. 3; To ensure that spray flow is maintained and is operable.

C. 2; To ensure that the delta T between the loops is less than 25°F.

D. 1; To ensure the vessel head temperature does not lag the rest of the RCS in cooldown.

A
  • A. 4; To ensure the required Tavg instruments are operable.
48
Q

Which ONE of the following functions does the Reactor Coolant Pump (RCP) flywheel provide?

A. Increases velocity of incoming fluid.

B. Minimize starting torque.

C. Prevents seal heating in an idle loop.

D. Sustains RCS flow following loss of power.

A
  • D. Sustains RCS flow following loss of power.
49
Q

The purpose of QRV-150, RCP #1 Seal Bypass Valve, is to provide:

A. adequate lower radial bearing cooling flow at low RCS pressures.

B. a relief path for RCP internal pressure if #1 seal gap is inadequate.

C. adequate cooling flow for #1 seal if leakoff flow is less than 0.2 gpm.

D. minimum #1 Seal DP at low RCS temperatures.

A
  • A. adequate lower radial bearing cooling flow at low RCS pressures.
50
Q

What input taps into RPS?

A
  • NR Thot ***
51
Q

What are the Rx head NSOs for?

A
  • to prevent steam voiding in the head during an accident which aids in core cooling

1. Systems (56 decks)

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