ML061950656

Tom Gurdziel Letter FitzPatrick LPCI Battery

ML061950656
Person / Time
Site:	FitzPatrick
Issue date:	06/25/2006
From:	Tom Gurdziel - No Known Affiliation
To:	Boska J Office of Nuclear Reactor Regulation
References
Download: ML061950656 (1)

Text

9 Twin Orchard Drive Oswego, NY 13126 June 25, 2006 Mr. John P. Boska Project Manager, NRR US NRC Washington, DC 20555-0001

Dear Mr. John P. Boska:

I do not think that Entergy/FitzPatrick has the recommended number of cells in their 419 volt LPCI batteries. (They have 186 cells).

I am reading this recommendation:

"The nominal voltage of a lead-acid cell is 2.0 Vdc and the number of cells used for the dc system is half the nominal system voltage (e.g. 24 cells for a 48-Vdc system).

Similarly, 60 and 120 cells are normally used for 125- and 250-Vdc systems. This number is by no means fixed and may vary based upon system maximum or minimum voltages."

If you call the LPCI battery a nominal 420 volts, they are about 24 cells short.

The reference is: "Considerations for Selecting and Sizing Batteries" by Marco W.

Migliaro. IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS VOL IA-23, NO.1, JANUARY/FEBRUARY 1987. 1 found it in Section 3 of the "Sourcebook on Lead-Acid Batteries" published by IEEE STANDARDS PRESS in 1992.

Could you have somebody check that they have the right number of cells for the LPCI service?

Vo.v trylours oo'mrGurdziel