ML18143A883

Information Pertaining to Valves Which Not Included in Item 1 of Our Letter Oct 6, 1970, Regarding furnace-sensitized Stainless Steel in the Reactor Primary Coolant System

ML18143A883
Person / Time
Site:	Ginna
Issue date:	10/26/1970
From:	Nelson E Rochester Gas & Electric Corp
To:	Morris P US Atomic Energy Commission (AEC)
References
Download: ML18143A883 (4)

Text

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/IIIIIIIII ROCHESTER GAS AND ELECTRIC CORPORATION e

89 EAST AVENUE, ROCHESTER, N.Y. 74604 EDWARDJ. NELSON PRESIDENT Dr. Peter A. Morris, Director Division of Reactor Licensing U. S. Atomic Energy Commission Washington, D. C.

20545

Dear Dr. Morris:

TEI.EPHONE AREA coDE 7ls 546.2700 October 26, 1970 lgpg

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Re:

Rochester Gas and Electric Corporation Docket No. 50-244 regulatory File Gy.

This letter contains information pertaining to valves which was not included in item 1 of our letter of October 6, 1970, regarding.

furnace-sensitized stainless, steel in the reactor primary coolant system of the R. E. Ginna Nuclear Power Plant Unit No. l.

The only valves which have sensitized stainless steel within the primary pressure boundary are two (2) pressurizer safety valves.

They were manufactured by Crosby Valve and Gage Company and are identified as Model 4K2-6.

Information pertaining to these valves is included in Attachment lA appended to this letter and supplements Attachment 1

contained as part of our letter dated October 6, 1970.

This information completes our response,to your letter of August 6, 1970.

Very truly yours, Attachment E

ard S. N son President

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ATTACHMENTlA

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Wk<r Dna Supplemental List of Furnace-Sensitized Stainless Steel Components including Location, Material, Sensitization Process and Operating Environment Pressurizer Safet Valves Nozzle sensitized during hardsurfacing operations directly on valve bodies.

Nozzle material is ASTM A182-F316 and hardsurfacing material is Stellite ]j6.

The hardsurfacing was done by the oxyacetylene process using a pre-heat of 800 F - 1000 F and a post-heat treatment of 1000 F.

Total time for operation including post-heat treat-ment is one (1) hour.

The nozzle of these valves is normally in an environment of stagnant air.

A water loop seal protects them from exposure to the environment found in the steam portion of the pressurizer.

They could, however, be capable of entrapment

• of gases.

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