ML17037A686

Table 7.2-1

ML17037A686
Person / Time
Site:	Nine Mile Point
Issue date:	02/06/2017
From:	Niagara Mohawk Power Corp
To:	Office of Nuclear Reactor Regulation
References
Download: ML17037A686 (1)

Text

NMPNS-2 TABLE 7.2-1 (CO>VZ'D)

Valve Location Number Approximat,e Valves Relative to Valve and/or of Pipe Size, Per Primary Operator Power to Power to Isolation Closing Normal Line Isolated Lines In. Line Group Containment Type (6) Open(5,6) Close(5,6) Signal Time(7,11,12) Status(9,10) Remarks 1/2 Inside SO valve A-c Spring A,F Open Primary containment D-c sample return Outside SO valve Spring A>F Open seal A Inside MO A-c A-c Standard Clo seel MSLIV water A Outside MO D-c D-c Standard Closed system 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 [A5 be de-energized to close valves. Accumuj ator air pressure plus outside the primary containment. Lines that extend outside the spring set together to close valves when both pilots are de- primary containment will be small and. terminate in a system that Ag energized. Voltage failure at only one pilot will not cause is designated to prevent out-leakage. Solenoid valves normally valve closure. The valves will be designed to fully close in will be closecl, but they will open on rod movement and during less than 10 seconds. reactor scram.

2. Containment spray and suppression cooling valves will have interlocks 5. A-c motor operated valves required for isolation functions shall be 9. Valve can 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 powered be 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 valve power. All air operated valves will close on during normal power operation of the 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 standard minimum closing rate for automatic isolation valves 11. The specified closure rates are as required for containment isolation on reverse flow even though the test switches may be positioned for vill 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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