Systems > CVCS > Flashcards

CVCS Flashcards

(23 cards)

Study These Flashcards
1
Q

Describe LCV-459 & 460

A
  • air open, fail close
  • auto close on Lpzr < 17% (459-control chnl)(460 b/u)
  • all three orifice valves must be closed to manually close 459/460
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2
Q

Norm value regen hx

Letdown inlet

Letdown outlet

Charging inlet

Charging outlet

A

545 degrees

290

130

480

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3
Q

Describe Orifice isolation valves CVCS-8149 A, B, & C

A
  • air open, fail close with nitrogen b/u
  • CS on VB2 and HSDP
  • close on phase A
  • close on Lpzr < 17%
  • close if LCV-459 or 460 off open seat
  • close loss of all charging
  • close if LTDN hx room >/= 150 degrees (HELB)
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4
Q

Describe CIV CVCS-8152

A
  • air open, fail close with nitrogen b/u
  • outside CNMT
  • close on phase A
  • close on LTDN hx room >/= 150 degrees (HELB)
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5
Q

Describe HCV-133

A
  • provide letdown flow via RHR when RCS d/p is too low to develop flow via CVCS
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6
Q

Describe Letdown hx

A
  • CCW cooled hx
  • removes heat from letdown to protect resin and RCP seals
  • TCV-130 maintains ~100 degrees outlet (controls CCW flow)
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7
Q

Describe PCV-135

A
  • air operated back pressure control valve
  • maintains 350 psig downstream of orifices (prevent flashing)
  • nominal set point is 58.3%
  • controls pressure of RCS when solid (?)
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8
Q

Describe TCV-149

A
  • air operated, three way globe valve
  • directs flow to demins or VCT
  • fails to VCT(loss air)
  • auto bypass to VCT if temp at 136 degrees
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9
Q 
Describe demineralizers
MB (2)
Cat bed (1)
Deborating (2)
Filters (2)
A

MB- maintain RCS chemistry(remove unwanted ions)
CB- reduce RCS pH by removing Li+ ions
DB- remove Boron when [B] so low it would take a lot of water to dilute (1-1 is MB used during forced O2)(1-2 is anion bed used to remove boron)
Ltdn filter- collects resin fines & other particulates

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10
Q

How does temperature affect resin beds affinity for boron

A
  • increased temp, saturated bed will release boron
  • reduced temp, saturated bed will absorb more boron

boron sweats!

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11
Q

Purpose of Zinc injection system

A
  • reduces source term
  • reduce general corrosion of primary system materials
    (Materials made up of alloy 600)(pwscc)
  • injects downstream of seal water hx, upstream VCT
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12
Q

Describe Argon injection

A
  • increase source term to enhance ability to detect primary to secondary leak
  • argon has short half life (1.8 hrs) and non-condensible => able to be monitored by SJAE rad monitor, injected into zinc injection line
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13
Q

Describe LCV-112A

A
  • air operated, fails to VCT (loss air) three way divert valve
  • at set point (norm 40%) valve will divert flow from VCT to LHUTs ( mods using prop cntrlr)(LT-114)
  • can be controlled manually
  • trip signal from LT-112 (87% Lvct)
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14
Q

Purposes of VCT

A
  • NPSH for CCP’s
  • maintain chemistry (H2 /N2 for O2 control)
  • maintain chemistry (degas RCS)
  • means to add boric acid and pri water to RCS
  • back pressure on #1 Seals
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15
Q

LT-112 outputs

A
  • trip open signal @ 87% Lvct (ovrds mod sig)
  • stop auto m/u @ 24%
  • start auto m/u @ 14%
  • 1/2 input to xfr CCP suction to RWST @ 5%
  • ind on VB-2
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16
Q

LT-114 outputs

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A
  • modulates LCV-112A divert to LHUTS @ 40% (based on cntrlr set point)
  • 1/2 input to swap CCP suction to RWST @ 5%
  • ind @ HSDP & ppc
17
Q

Describe CCP’s

P.S.
1-1
1-2
1-3

Study These Flashcards
A
  • hi head ECCS pumps
  • normal charging (1-3, then 1-2/1-1)(1-3 is air cl)
    • return letdown flow to RCS
    • cool regen hx
    • seal injection
      P.S
      1-1 F
      1-2 G
      1-3 G (air cooled)
18
Q

Auto starts on ECCS CCP

Manual start

Study These Flashcards
A

SI
XFR to diesel

(Auto start will not wait for oil Press)

Manual will not start in man if oil Press < 9psig

19
Q

Trips on ECCS CCP

Study These Flashcards
A

O.C.

Xfr to diesel (load shed)

20
Q

CCP 1-3

Trips

Study These Flashcards
A

Air cooled

UV
O.C.
Xfr to diesel

21
Q

What will cause CCP suction to swap from VCT to RWST?
LCV-112B, 112C close
8805A, 8805B open

Study These Flashcards
A

Both LT-112 & 114 = 5% Lvct
SI
As soon as one RWST valve is f.o., VCT valves will shut

22
Q

Describe purpose, interlock and p.s. for 8107 and 8108

Study These Flashcards
A

Close on SI
Isolates charging(downstream of HCV-142)
8107-F, 8108-G
Motor operated CIV

23
Q

Different possible loads on seal water hx?

During SI

Study These Flashcards
A

Seal return
Excess letdown
CCP recirc

Only CCP recirc

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