ML17037C683

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Table 7.2-1, Isolation Signal Codes (Cont'D) 6 of 6
ML17037C683
Person / Time
Site: Nine Mile Point Constellation icon.png
Issue date: 02/06/2017
From:
Niagara Mohawk Power Corp
To:
Office of Nuclear Reactor Regulation
References
Download: ML17037C683 (1)


Text

NMPNS-2 TABLE 7 2-1 (CONT'D)

OLATI S DE

13. Abbreviations used in table: ~Si nal vessel low water level (A scram will occur at this level also. This is the higher of the two low water level signals)

D~t'eactor AO Air operated MO Motor operated Reactor vessel low water level - (The reactor core isolation cooling system will be initiated at this level also. This is the lower of the two low water level signals.)

SO Solenoid operated High radiation - main steam line RHR - Residual Hea* Removal System Dtt Line break - main steam line (high steam flow)

LPCI - Low Pressure Coolant Injection System EDD Line break main steam line (steam line high space temperature)

RCIC Reactor Core Isolation Cooling System Ftj. High dry well pressure LPCS Low Pressure Core Spray System Reactor vessel low water level or high dry well pressure (core standby cooling systems will be started.)

HPCS High Pressure Core Spray System H High reactor water level in startup mode Line break in cleanup system high space temperature; high differential flow Line break in reactor core isolation cooling system steam line to turbine (high steam line space temperature, high steam flow, or low steam line pressure)

Line break in residual heat removal system shutdown and. head cooling (high space temperature)

N Reactor high water level PDD Low main steam line pressure at inlet to turbine (RUN mode only)

R Low condenser vacuum S Low dry well pressure High reactor vessel pressure close residual heat removal shutdown cooling valves and head cooling valves High temperature at outlet of cleanup system nonregenerative heat exchanger, high differential flowD high area temperatureS Standby liquid control system actuated IA6 Remote manual switch from control room. (All regular Group A and Group B isolation valves will be capable of'emote manual operation from the control room.)

These are the isolation functions of the primary containment and reactor vessel isolation control system; other functions are given for information only.

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