MSS(1) - Main Steam

Simplified Diagram

To MSRs

Simplified Diagram

MSRs to LPs

Nominal Parameters

Zero to Full Load

Zero: 1,085psig

Full: 830psig

Bypass Valves

Capacity

PMS Isolation

GSS/ASS Supply from Main Steam

GSS/ASS Supply from Main Steam Cont.

Aux Steam vs Main Steam Supply

Moisture Separator Reheaters

Heater Stages supply

Main Steam to MSR

Sequence Power Levels

Main Steam to MSR

Sequence Power Levels Cont.

Extraction MOVs vs NRVs

PMS Steamline Isolation Overview

3.7.1 Main Steam Safety Valves (MSSVs)

Applicability *Note

Number of Operable MSSVs to Maximum Power Level

MODES 1, 2, 3, and 4

*Not required to be Operable for OPENING when on SDC

3.7.1 Main Steam Safety Valves (MSSVs)

Lift Settings

First Setpoint: Design Pressure of system

+12psig

+12psig

+12psig

+11psig

+0psig (same as previous)

3.7.2 Main Steam Line Flow Path Isolation Valves

LCO (Applicable Valves)

Applicability

MSIVs (5-10sec closure time)

MSIV Bypasses

MSL Drain valves

Turbine Stop or Control valves*

Bypass valves

MSR 2nd stage steam isolation valves

MODES 1, 2, 3, and 4

3.7.8 Main Steam Line Leakage

LCO

Applicability

MSL leakage through pipe walls INSIDE containment shall be ≤0.5gpm

MODES 1, 2, 3, and 4