ML19291B114

Forwards Info on Seismically Qualified Purge Valves & Actuators in Response to 790716 Request

ML19291B114
Person / Time
Site:	Arkansas Nuclear
Issue date:	08/22/1979
From:	Trimble D ARKANSAS POWER & LIGHT CO.
To:	Reid R Office of Nuclear Reactor Regulation
References
1-089-8, 1-89-8, NUDOCS 7908290420
Download: ML19291B114 (3)

Text

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ARKANSAS POWER & LIGHT COMPANY POST OFFICE BOX 551 LITTLE ROCK. ARKANSAS 72203 [501) 371-4000 e

August 22, 1979 1-089-8 U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Attention: Mr. R. W. Reid Chief, Operating Reactor Branch #4 Subj ect : Arkansas Nuclear One - Unit 1 Docket No. 50-313 License No. DPR-51 Reactor Building Purge Valves (File: 1510, 1511.1)

Gentlemen:

Attached is information on purge valves and their actuators requested in your July 16, 1979, letter.

Each type of actuator and the purge valves were seismically qualified by individual analysis in the early 1970's.

Purging at power is restricted by administrative controls to less than eight hours per issuance of a Reactor Building Gaseous Waste Release Permit. An average of approximately six of these permits have been issued per year during the last four years, which indicates an average purge time o f forty-eight hours per year. However, the unit is usually p2 aced in a cold shutdown condition during the purging operation which will give an actual average purge time of much less than forty-eight hours per year for purging at power.

Very truly yours, s

f a c

, David C. Trimble Manager, Licensing DCT: ERG:nm Attachments 2012 7/,l

.o 79082go MEMEEA MtOOLE SOUTH UTlUTIEs SYSTEM

DATA FOR C0flTAlflMErlT PURGE & VErlT VALVE ASSEft0 LIES FACILITY: Arkansas Nuclear One - Unit 1

• flUCLEAR ~VEllDOR: Babcock and wticox ASE: Bechtel Corp.

- DATA FOR VALVES -

~

T IMED ,*

DESIGNAT10rl PART OR INSIDE OR SEC0tlDS

• Off P. I . VALVE VALVE VALVE VALVE MODEL 0*ISIDE fl0. DRAWillG 5IZE TYPE MAflVFACTURER flUMBER C0flTAIllMENT

_ _CLOSE TIME 1 CV-7401 54" Butterfly llenry Pratt Co. 2.4 RlA g Outside Anvil Seat " Return" 2 CV-7402 54" Butterfly IIenry Pratt Co. 3.3 RlA Outside Anvil Seat " Supply" 3 CV-7403 54" Butterfly llenry Pratt Co. 4.7 RlA Inside Anvil Seat " Return" 4 CV-7404 54" Butterfly IIenry Pratt Co. 5.0 RlA Inside Anvil Seat " Supply"

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• Average of last four tests.

N .

CD TJ .

as '

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DATA FOR ACTUATORS INFORMAT10ft FOR PILOT VALVE '

ACTUATOR IF AIR CYLIllDER ACTUATORS:

PART OR lilSIDE OR 7 -

ACTUATOR ACTUATOR MODEL PART OR OUTSIDE fl0. liAfluFACTURER TYPE flullBER flANUFACTURER f10 DEL 110. C0tlT Al!!ME'iT -

1 Bettis Pist6n-Sprin), T520-SR2 ASCO FT8331A45 Outside Air to open 2 Bettis Piston-Spring, T520-SR2 ASCO FT8331A45 Outside Air to open 3 Limitorque-Philadelphia Gear Corp. Motor SMB3-80/

IISBC 4 Limitorque-Philadelphia Gear Corp. Motor SMB3-80/

il5BC N

cD N

• J .

tA ghich Valve Assemblies have been seismically qu211(idd? AVERAGE PURGt TIf4E (ll0URS) PER YR PER Util Individual analysis of actuators and valves has qualified Less than fifty. .

each item separately.

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