ML061950656
| 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 o o'mrGurdziel