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RO34 - Revised and Upgraded Decks > Main and Reheat Steam > Flashcards

Main and Reheat Steam Flashcards

1
Q

What are the safety related functions of the Main Steam system?

A
  • Supply steam to the TDAFW Pump
  • Control the plant cooldown rate during a station blackout using the SG PORVs
  • Allow rapid cooldown following a SGTR.
  • Provide isolation capability following a HELB.
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2
Q

What the pressure set points for the SG PORVs and MSSVs?

A

2 Safeties @ 1065 psig
2 Safeties @ 1075 psig
1 Safety @ 1085 psig

1 SG PORV @ 1025 psig

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3
Q

What percent steam flow are each safety rated for?

A

5.5% steam flow ea

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4
Q

Why do we have PORVs?

A
  • Prevents lifting safeties
  • Used to cooldown when steam dumps are unavailable
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5
Q

What percent steam flow are each PORV rated for?

A

2.5% steam flow ea

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6
Q

In regards to the Main Steam System, what will cause a SI?

A
  • SG less than 500 psi on 2 SGs (1/1)
  • Steam Line DP greater than 100 psi, 1 SG lower than 2 others
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7
Q

What causes Steam Line Isolation (SLI)?

A
  • 2.8# in Lwr Ctmnt
  • SG Pressure Low
    (500# 1/1 on 2 SGs)
  • High Steam Flow with Low-Low Tavg (541°F)
    (1.42E6 (1.6E6) pph at 0%, variable with power 1/2 on 2/4 SGs)
  • Manual
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8
Q

How will the SGSV dump valves fail on loss of ctrl power?

A

Closed, causing the SGSV to remain open

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9
Q

How will the SGSV dump valves fail on loss of ctrl air?

A

Open, which will close the SGSV

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10
Q

Are the rad monitors downstream of the PORVs operable if the PORVs are isolated?

A

NO

Also INOP if controller is taken to manual and closed

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11
Q

What is the purpose of the SGSVs?

A
  • Ensures only 1 SG will blowdown in a steam rupture, even when 1 SGSV fails.
  • Minimize positive reactivity from RCS cooldown
  • Limit Containment pressure for steam rupture inside Containment.
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12
Q

WIll the SGSVs close on a SLI?

A

Yes, in 8 sec

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13
Q

How are the SGSVs interlocked to prevent opening them with a SLI signal?

A

Hydraulics are interlocked to prevent opening with a standing SLI signal

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14
Q

How do you clear the SGSV interlock to allow closing of the SGSV dump valves?

A

Take the ctrl switch to lockout

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15
Q

What are the MS bypass header loads?

A
  • MFPs
  • MSR High Pressure Steam
  • Steam Dumps
  • Aux Steam
  • Low Flow FW Preheating
  • Turbine Steam Seals (U2 Only)
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16
Q

What are the Aux Steam header loads?

A
  • Turbine sealing steam (U1)
  • SJAE
  • MFPs (startup)
  • Plant heating
  • Aux Building Vent Heating
  • Boric Acid Batch Tank
  • Chemical cleaning station
  • Hotwell de-aerating (Unit 2 only)
  • CO2 vaporizers
17
Q

Where are the TDAFP Turbine steam shutoff valves located?

A

2 and 3 SGs after the MS venturis and before the Safties/PORVs

18
Q

How are the PORVs operated if ctrl power and ctrl air/N2 is lost?

A

By a handwheel on the valve

19
Q

How do the SGSVs open and close?

A
  • Hydraulic for normal opening and closing
  • Steam to close in emergency
20
Q

What does 3.7.4D SG PORVs (Mode 4 when SGs relied upon for heat removal) state?

A

IMMEDIATELY Initiate action to restore Inoperable SG PORV(s) to Operable status

21
Q

What is the S/G PORV Set point raised to when have a SG Tube Rupture?

A

1040 psi

22
Q

How do the S/G PORV’s fail?

A

Closed

23
Q

How do the MSL, Bypass Header, and Turbine Steam Lead Drains fail on Turbine Trip?

A

Open

24
Q

Which ONE of the following describes the function of the LOCKOUT position associated with each Steam Generator Stop Valve (SGSV) Dump Valve control switch?

A. Prevents the operator from opening the SGSV Dump Valves after the receipt of a Hi-Hi Containment Pressure Signal.

B. Allows the operator to close the SGSV Dump Valves after the receipt of a Hi-Hi Containment Pressure Signal.

C. Prevents a Hi-Hi Containment Pressure Signal from closing the associated SGSV and allows testing of the circuitry.

D. Allows the operator to open a SGSV hydraulically after the receipt of a Hi-Hi Containment Pressure Signal.

A

B. Allows the operator to close the SGSV Dump Valves after the receipt of a Hi-Hi Containment Pressure Signal.

25
Q

How is the SGSV held open/closed?

A

Detents

26
Q

Where are the U1 Main Steam orifices located?

A

On the bypass header before entering the bypass equalizing header

27
Q

Where are the U2 Main Steam orifices located?

A

Main Steam Header right after the SGSVs

28
Q

How many rad monitors and detectors for the PORVs?

A

2 monitors, and 4 detectors

29
Q

What does the operability of the Main Steam Safety Valves ensure?

A

secondary steam pressure will be limited to 110% of desired pressure during most severe anticipated operational transient

30
Q

When are the PORV Rad Monitors considered INOPERABLE per TRM 8.3.8?

A
  • If PORV Manual Isoaltion Valves is closed
  • If PORV controller is in manual
31
Q

When is Reactor Nitrogen System needed to maintain SG PORV Operability per TS 3.7.4?

A

When CAC or CD EDG is unavailable

32
Q

When is a SG PORV considered OPERABLE?

A

When capable of fully opening from the control room. (If manually isolated in field, PORV is INOP)

33
Q

What are the main steam pressures for both units at ~50% power?

A

Unit 1 ~885 psig
Unit 2 ~900 psig

Unit 2 SG pressures higher than Unit 1

RO34 - Revised and Upgraded Decks (84 decks)

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