ML19030A745

Referring Letters of 6/22 & 9/2/1977, Providing Description & Evaluation of Design Measures to Minimize Potential for Water Hammer & Water Hammer Testing, as Requested

ML19030A745
Person / Time
Site:	Salem
Issue date:	01/10/1978
From:	Librizzi F Public Service Electric & Gas Co
To:	Lear G Office of Nuclear Reactor Regulation
References
Download: ML19030A745 (2)

Text

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..Mr. George Lear 1/10/78

1. All bottom discharge holes in the feedwater spargers were plugged. J-tubes were installed to provide "top djscharge" capability,

2. the effective length of the horizontal runs of feed-water pipe adjacent to all steam generator inlet nozzles were shortened by the installation of a "loop seal" piping arrangement to ensure that the pipe length which could be drained through the sparger was minimized,

3. a rate of steam generator level recovery restriction of 1. 2" per minute was imposed when the level was below the sparger and additionally,

4. the Salem design provides for automatic initiation of auxiliary feedwater.

Details of items 1 and 2 were previously transmitted to you as the response to Question 10.18 in the Salem Plant FSAR.

It is felt that these measures, which are in full accord with the recommendations of the Creare Report (enclosed with the Reference 2 letter), provide adequate assurance that the feedwater lines and spargers will remain full during normal and transient operating conditions, and that the potential for the destructive water hammer at the Salem Plant is at a minimum.

Water Hammer Testing The topic of conducting a water hammer test of the feedwater system for the purpose of removing the license restriction on the rate of steam generator level recovery has been thoroughly evaluated, and we choose not to perform such a test at this time. Subjecting the system to the conditions required in such a test does not appear to be warranted in light of the benefits involved at the present time.

very truly yours, hut~

F. P. Librizzi General Manager -

Electric Production 7Dl 04/05