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LOSC > Pressurizer > Flashcards

Pressurizer Flashcards

1
Q

The Surge line for the pressurizer taps into the RCS where?

A

Loop 3 Hot Leg

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2
Q

What is the level to gallons ratio at NOP/NOT?

A

50.56 gals per 1%

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3
Q

What are your cooldown limits? Admin limits?

A

200°F per hour (Admin of 195°F/hr)

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4
Q

What are you heatup rate limits? admin?

A

100°F/hr (Admin 95°F/hr)

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5
Q

On insurge of RCS into Pressurizer (PZR insurge) what happens?

A

Pressue and Temperature RISE to maintain T(sat) and P(sat) conditions.

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6
Q

On outsurge of Pressurizer into the RCS what happens?

A

Pressure and Temperature Lower to maintin T(sat) and P(sat) conditions

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7
Q

The Pressurizer control heaters are powered from?

A

480V Bus 2B

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8
Q

What controls (turns off/on) the Control heaters for the pressurizer?

A

PC-444J, based on pressure of 2235(±15psig) from PT-444

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9
Q

What are the breaker trips for the Control Heaters for the PZR?

A
  • PZR low level @ 14.4% (does not reset automatically, must take switch to off to reset)
  • Overcurrent
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10
Q

PZR B/U heaters power supplies are?

A

B/U group A powered from 480V Bus1
B/U group B powered from 480V Bus2A

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11
Q

While in auto, what is the B/U PZR heaters operating parameters? from what controler?

A

In auto they operate from 2210-2220psig from PC-444J

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12
Q

B/U PZR heaters breaker trips are?

A
  1. PZR low level @ 14.4% (will not come back on automatically, must take switch to off to reset) In ON heaters trip on low level from the LT-460 only, in AUTO heaters trip on low level from LT-460 & LT-459
  2. Overload
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13
Q

B/U heaters can be controled locally where?

A

Locally controlled in Rod Drive Control Room. (Removes auto functions)

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14
Q

What is the ITS requirments for KW if on emergency power to be supplied to PZR heaters?

A

ITS requires 125KW, EPP-21directs 150KW from an E-bus.

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15
Q

Where is the PZR HTR ARMING SWITCH?

A

It is on the Miscellaneous Relay Rack 50 (Will trip open the heater supply breaker if a subsequent SI is recieved to prevent overloading an EDG)

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16
Q

What are the backup power supplies to the heater groups?

A
  1. Control group can be powered from “B” EDG & DSDG
  2. B/U group A can be powered from “A” EDG
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17
Q

What are the PZR Spray Valves?

A
  1. PCV-455A off of Loop 2 cold leg, must have 30% PZR level and “B” RCP running
  2. PCV-455B off of Loop 3 cold leg, must have “C” RCP running
  3. CVC-311- Aux Spray from Charging , Max 320°F ▲T between PZR and spray to prevent thermal shock to nozzels.
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18
Q

PZR spray valves start to open and close when? Controled by?

A
  1. Start to open @2260psig, fully open @ 2310psig
  2. Start to close @ 2285psig, fully closed @ 2235psig
  3. In auto controlled by PC-444J
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19
Q

What is the purpose of the PZR spray valves bypass flow?

A

0.5gpm through needle valves to keep line warm and prevent thermal shock, also provideds a way for mixing with RCS to keep boron concentraion with in 10ppm.

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20
Q

If a safegaurds (Phase A) actuation happens how does this effect the PZR spray?

A

Phase A closes PCV-1716, meaning no IA to CV, and all PZR spray valves fail closed.

21
Q

How many PZR safety valves?

A

3

22
Q

At what pressure do the safetys open?

A

2485psig (RCS design pressure)

23
Q

Where are the acoustic monitors for the PZR safety vavles?

A

Cable spread room

24
Q

How many PZR PORVS?

A

2

25
Q

What is the mode of force for the PORVs?

A

N2

26
Q

PCV-455C (PZR PORV) when does open? Powered by?

A

Opens at 2340psig
Powered from DP “B”

27
Q

PCV-456 (PZR PORV) when does it open? Powered by?

A

Opens at 2235psig
Powered from DP “A”

28
Q

PORV Black Valves are powered from?

A

MCC-6

29
Q

LTOPP (Low Temperature Over Pressure Protection) does what?

A

Changes the PORV pressure setpoint to varibale no lower than 400psig

30
Q

When is LTOPP used?

A

When <365°F

31
Q

PZR lvl Control transmitters?

A
  1. LT-459
  2. LT-460
  3. LT-461 (Can do either of the other two LT’s, acts as a backup)
32
Q

HI level trip is caused by?

A

LT-459/460/461 (2/3) at 91% above P7

33
Q

Level programing (Parameters of lvl to Tavg)
lvl in PZR from 0% to 100% power

A
  • 22.2% level in PZR at 0% power
  • 53.3% level in PZR at 100% power

you can use this to find the lvl or power if you have one or the other

34
Q

ITS requirements for the PZR?

A
  • ≤63.3% in mode 1
  • ≤92% in modes 2 or 3
  • Always have ≥125kw of heaters from E-bus
35
Q

LT-459 controls what?

A
  1. Level in the PZR by controlling Charging pump speed
  2. Gives HI and LO lvl alarms +/- 5% from program.
  3. At +5 lvl will turn on B/U heaters anticipating an insurge.
  4. At 14.4% cuts off control heaters and B/U (if in auto) also shuts LCV-460A/B
36
Q

LT-460 controls what?

A

At 14.4% cuts off control heaters and B/U heaters (in auto or on) also isolates letdown

37
Q

LT-461 controls what?

A

Backup LT, will perform all functions of what LT it replaces.

38
Q

PZR, PTs for protection?

A
  • PT-455
  • PT-456
  • PT-457
39
Q

PZR, PTs for control?

A
  • PT-444
  • PT-445
40
Q

PT-455, 456, 457 do what?

A
  1. 2376psig (2/3) Hi Pressure Rx trip
  2. 2000psig (2/3) Premissives for SI black and Closes PZR PORV’s (when in auto)
  3. 1844psig (2/3) Low Pressure trip
  4. 1715psig (2/3) Low pressure SI
  5. Input to OT▲T trip and runback
41
Q

PT-444 does what?

A
  1. Pressure indication on the RTGB, and at the MDAFW pump station
  2. Signals to proportaional integral controller (PC-444J) on RTGB
  3. Opens PVC-455C (PORV) (@2340psig)
42
Q

PT-445 does what?

A
  1. Singals PZR CNTRL HI & LO press alarms on RTGB
  2. Opens PCV-456 (PORV) (@2335psig)
  3. Indication on the RTGB
43
Q

PC-444J controls what?

A
  1. Control Group heaters +/-15psig
  2. Back up heaters 2220-2210psig
  3. Spray Valves
  4. PI-458 to indicate +/-15
44
Q

If LT-459 fails high what happens?

A
  1. If in auto charging pump drops to min. speed
  2. B/U heaters in auto energize
  3. PZR HI LVL, and PZR protection & Control HI level alarms
  4. Actual PZR level lowers causing letdown isolation and all heaters to turn off at 14.4% (Auto or manual) (LT-460 causes this)
  5. PZR presssure slowly falls due to lack of heaters.
  6. 15.4% signal resets, can mannually restore letdown and heaters.
45
Q

LT-459 failing high does different trips base on power level.

A
  1. High Power- OT▲T trip
  2. Low power- Low pressure trip at 1844psig
  3. Power <P-7- pressure would decrease to SI setpoint 1715psig
46
Q

LT-460 fails high what happens?

A

PZR protection high level alarm and bistable

47
Q

LT-461 fails high what happens?

A

PZR protection high level alarm and bistable

48
Q

LT-459 fails low, what happens?

A
  1. If in auto, charging pump max speed
  2. 14.4% letdown isolation and all heaters off (B/U if in auto)
  3. Low PZR Level alarm and bistable at 10%
  4. Actual PZR level increases (at 91% 2/3 get Reactor trip if >p-7)
49
Q

LT-460 fails low

A

1.If in auto, charging pump max speed
2.14.4% letdown isolation and all heaters off (B/U if in auto)
3.Low PZR level alarm and bistable at 10%
4.Actual PZR level increases (at 91% 2/3 get Reactor trip if >p-7)

LOSC (18 decks)

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