LOT 201.14 PZR Pressure & Level

Question 1

• LOT 201.14 PZR Pressure & Level*
• • *

At what pressure will the PORV (PCV-655A) lift when COMS is armed?

Answer 1

• 70 - 200 ˚F:*
• *515 psig**
• 220 - 380 ˚F:*
• *730 psig**

Uses Auct Low WR T_H / PT-403

• Note:*
• Normal PORV setpoint is ≈ 2335 psig. (Master pressure controller 87.5%)*

Question 2

• LOT 201.14 PZR Pressure & Level*
• • *

How many RCPs are required for PZR Spray?

Answer 2

• *RCP 1A ONLY**
• *OR**
• *RCP 1D ONLY**
• *OR**
• *RCPs 1B AND 1C**

Question 3

• LOT 201.14 PZR Pressure & Level*
• • *

At what pressure will the PORV (PCV-656A) lift when COMS is armed?

Answer 3

• 70 - 200 ˚F:*
• *475 psig**
• 220 - 380 ˚F:*
• *660 psig**

Uses Auct Low WR T_C / PT-404

• Note:*
• Normal PORV setpoint is 2335 psig. (B/U pressure channel)*

Question 4

• LOT 201.14 PZR Pressure & Level*
• • *

What T_avg is used to calculate PZR program level?

Answer 4

Auctioneered High T_avg

Compares selected controlling channel level (LT-465 or LT-467) to program level to determine demand to FCV-0205.

Question 5

• LOT 201.14 PZR Pressure & Level*
• • *

Which PZR level instruments are displayed on CP004?

Answer 5

• Hot Calibrated:*
• *LT-465 / LT-466 / LT-467**
• LT-468 only in ICS / QDPS*
• Cold Calibrated:*
• *LT-675**
• Calibrated to 140 ˚F*

Switch allows operator to select Cold Calibrated Level or Program Level.

Question 6

• LOT 201.14 PZR Pressure & Level*
• • *

What controls the opening of the PZR Spray Valves? (PCV-655B / PCV-655C)

Answer 6

• *Master Pressure Controller**
• Driven off controlling channel*

• Note:*
• Only odd numbered channels can be selected as the “controlling channel” to input to the master pressure controller. (455/457)*

Question 7

• LOT 201.14 PZR Pressure & Level*
• • *

Which PZR Pressure instrument does not tie into P-11?

Answer 7

PT-458

P-11: PZR Pressure ≥ 1985 psig [2/3]

Question 8

• LOT 201.14 PZR Pressure & Level*
• • *

What is the basis for the size of the PZR?

Answer 8

• Enough Water:*
• *Keep Heaters covered during step load increase of 10%**
• Enough Steam:*
• *Accomodate 50% load reduction w/o reaching PZR LVL - High (92%)**
• w/ Rods and Steam Dumps*
• *After PZR LVL - High (92%) Rx trip, will not lift safety valves**
• After Rx Trip AND Turbine Trip:*
• *No SI**
• *PZR will not empty**

Question 9

• LOT 201.14 PZR Pressure & Level*
• • *

What is the effect of indicated PZR level for the following conditions?

• Reference Leg Break
• Diaphragm Failure
• Reference Leg Heating

Answer 9

• Reference Leg Break:*
• *Less Mass → D/P ↓ → L_ind↑**
• Diaphragm Failure:*
• *D/P ↓ → L_ind↑**
• Reference Leg Heating:*
• *Less Mass → D/P ↓ → L_ind↑**
• w/o compensation*

Question 10

• LOT 201.14 PZR Pressure & Level*
• • *

What is the bypass flow for the PZR spray valves?

Answer 10

2 gpm

Minimizes thermal shock when spray valve opens.

Note:
Each PZR spray valve provides 525 gpm

Question 11

• LOT 201.14 PZR Pressure & Level*
• • *

What controls the opening of the PORVS? (PCV-655A / PCV-656A)

Answer 11

• PCV-655A:*
• *Master Pressure Controller**
• 87.5% (≈ 2335 psig)*
• PCV-656A:*
• *Backup PZR Pressure Channel**
• 2335 psig*

• Note:*
• Only odd numbered channels can be selected as the “controlling channel” to input to the master pressure controller. (455/457)
• Only even numbered channels can be selected for backup control, and they only input to PCV-656A (456/458)
• Switch on CP004

Question 12

• LOT 201.14 PZR Pressure & Level*
• • *

At what pressure will the PZR PORV auto open signal blocked?

Answer 12

2185 psig

• PCV-655A (PT-458)
• PCV-656A (PT-457)

Tailpipe temperature for PORVs and Safeties on CP004. (PORV: TI-676 / Safeties: TI-677 - 679)

Question 13

• LOT 201.14 PZR Pressure & Level*
• • *

What are the important PZR Master pressure controller setpoints?

Answer 13

• PCV-655A:*
• *87.5%: Opens**
• *75%: Closes**
• Spray Valves:*
• *72%: Full Open**
• *40.5%: Start to Open**
• Control Heaters:*
• *34.5%: Zero Power**
• 22%: NOP*
• *15.5%: Full Power**
• B/U Heaters:*
• *14.5%: Turn Off**
• *9.5%: Turn On**

Question 14

• LOT 201.14 PZR Pressure & Level*
• • *

How many PZR heaters are there and what is the KW rating / heater?

Answer 14

117 Heaters

• *17.95 KW / Heater**
• 2101 KW Total*

LCO 3.4.3 PZR

Applicable MODES 1-3

• Requires 2 groups (A/B) w/ 175 KW each

Question 15

• LOT 201.14 PZR Pressure & Level*
• • *

What PZR Level deviation will automatically turn on PZR B/U Heaters?

Answer 15

• *+ 5% Level Deviation**
• Controlling Channel Level (LT-465/467) > 5% above Program Level*

Done to preheat PZR insurge.

• Note:*
• Charging flow at +5% Level Deviation: 50 gpm
• Charging flow at -5% Level Deviation: 300 gpm

Question 16

• LOT 201.14 PZR Pressure & Level*
• • *

When is COMS required to be armed?

Answer 16

≤ 350 ˚F

• PCV-655A (Auct Low WR T_H / PT-403)
• PCV-656A (Auct Low WR T_C / PT-404)

COMS controller completely independent of master pressure controller.

• Note:*
• Manually armed on CP004*

Question 17

• LOT 201.14 PZR Pressure & Level*
• • *

What is the PZR Program Level for 0% RTP and 100% RTP?

Answer 17

• 0% RTP (567 ˚F):*
• *25%**
• 100% RTP (593 ˚F):*
• *57%**

At actual 100% RTP (592 ˚F) PZR Level will be 55.7%.

Question 18

• LOT 201.14 PZR Pressure & Level*
• • *

While operating in MODE 1, what is your PZR Pressure DNB limit?

Answer 18

2200 psig

LCO 3.2.5 DNB Parameters

Applicable: MODE 1

Question 19

• LOT 201.14 PZR Pressure & Level*
• • *

At what PZR level will the heaters trip off?

Answer 19

• *17% [1/2]**
• LT-465/467 OR LT-466/467*

Backup heaters will turn back on if in auto once PZR LVL > 17%. [2/2]

• Note:*
• For LOOP / SI, B/U heaters control switch must be cycled to turn back on.*