ML17037A701

Table 7.2-1 (Continued)

ML17037A701
Person / Time
Site:	Nine Mile Point
Issue date:	02/06/2017
From:	Niagara Mohawk Power Corp
To:	Office of Nuclear Reactor Regulation
References
Download: ML17037A701 (1)

Text

NMPNS "2 TABLE 7.2-1 (CONT'D)

Valve Location Number Approximate Valves Relative to Valve snd/or of Pipe Size, Per Primary Operator Power to Power to Isolation Normal Line Isolated Lines In. Line Garou Containment ~z(6 Open(5,6) ~66' 6) Signal Closing Time(7,11,12) Status(9,10) Remarks Primary containment 1/2 Inside SO valve A-c Spring A>F>Z Open sample return Outside SO valve D-c Spring Open MSLIV water seal Inside MO A-c A-c Standard Closed system Outside MO D-c D-c Standard Closed A5 NOTES These notes are keyed by number to correspond to parentheses.

1. Main steam isolation valves will require that both solenoid pilots 4. Control rod hydraulic lines can be isolated by the solenoid valves 8. Refueling fleer exhaust high radiation signal "Z" be de-energized to close valves. Accumulator air pressure plus outside the primary containment. Lines that extend outside the will be generated. by two trip channels; each channel will have ia5 spring set, together to close valves when both pilots sre de- primary containment will be small snd terminate in a system that two trip units. This will require one unit at high trip or energized, Voltage failure at only one pilot will not cause is designated to prevent out-leakage. Solenoid valves normally one unit at downscale (instrument failure) trip, on one trip valve closure. The valves will be designed to fully close in will be closed, but they will open on rod movement snd during channel and one unit st high trip or one unit at downscale trip less than 10 seconds. reactor scram. on the other trip channel in order to initiate isolation.

2. Containment spray and suppression cooling valves will have interlocks 5. A-c motor operated valves required for isolation functions shall be 9. Valve csn be opened or closed by remote manual switch for operating that allow them to be manually reopened. after automatic closure. This powered from the a"c stand-by power buses. D-c operated convenience during any mode of reactor operation except when setup will permit containment spray, for high dry well pressure con- isolation valves will be powered from the staticn batteries. automatic signal is present.

ditions, and/or suppression water cooling. When automatic signals are not present these valves may be opened for test or operating 6. All motor operated isolation valves will remain in the last position 10. Normal status position of valve (open or closed) is the position convenience. upon failure of'alve power. All air operated valves will close on during normal power operation of'he reactor (see "Normal Status" motive air failure. column) .

3~ Testable check valves will be designed for remote opening with zero differential pressure across the valve seat. The valves will close 7. The stsndarcl minimum closing rate for automatic isolation valves 11. The specified closure rates are ss required for containment isolation on reverse flow even though the test switches may be positioned for will be based on a nominal line size of 12 in. Using the standard only.

open. The valves will open when pump pressure exceeds reactor closing rate, - 12 in, line will be isolated in 60 seconds. Con-pressure even though the test switch may be for close. version to closing time can be made on this basis using the actual 12. Minimum closing rate is based on valve and line size.

size of the line in which the valve is installed..

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