05000266/LER-1997-036, Forwards LER 97-036-00,describing Discovery That Coincidental,Random Failure of Particular DC Power Supply During Seismic or Tornado Event Could Prevent Timely Stoppage of Auxiliary Feedwater Pumps

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Forwards LER 97-036-00,describing Discovery That Coincidental,Random Failure of Particular DC Power Supply During Seismic or Tornado Event Could Prevent Timely Stoppage of Auxiliary Feedwater Pumps
ML20217B802
Person / Time
Site: Point Beach NextEra Energy icon.png
Issue date: 09/25/1997
From: Dante Johnson
WISCONSIN ELECTRIC POWER CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20217B804 List:
References
NPL-97-0589, NPL-97-589, NUDOCS 9709300230
Download: ML20217B802 (1)


LER-2097-036, Forwards LER 97-036-00,describing Discovery That Coincidental,Random Failure of Particular DC Power Supply During Seismic or Tornado Event Could Prevent Timely Stoppage of Auxiliary Feedwater Pumps
Event date:
Report date:
2662097036R00 - NRC Website

text

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Wisconsin Electnc POWER COMPAN1' Point Beach Nuclear Pkant (920) 755 2321 6610 Nuckpor Rd . Iwo Revers. WI 54241 NPL 97-0589 September 25,1997 Document Control Desk U.S. NUCLEAP. REGULATORY COMMISSION Mail Station Pl-137 Washington, D. C. 20555 ,

Ladies / Gentlemen:

DOCKETS 50 266 AND 50 301 LICENSEE EVENT REPORT 97-036-00 POTENTIAL COMMON MODE FAILURE IN DC POWER SUPPLY

] COULD DISABLE AUXILIARY FEEDWATER SYSTEM

POINT BEACH NUCLEAR PLANT. UNITS 1 AND 2 4

Enclosed is Licensee Event Report 97-036 00 for Point Beach Nuclear Plant, Units 1 and 2. This 4

report is provided in accordance with 10 CFR 50.73(a)(2)(ii)(B), "a condition that was outside the design basis of the plant." This report describes the discovery that a coincidental, random failure of a particular DC power supply during a seismie or tornado event could prevent the timely stoppage of auxiliary feedwater (AFW) pumps if the normal water supply to the AFW

pumps were damaged by the earthquake or iomado.

New commitments within the report are indicated in italics.

i i P! case contact us if you require additional information.

! Sincerely, W

i D. F. Johnson

Manager, Regulatory Services & Licensing gaa,lf)

Enclosure cc: NRC Resident inspector NRC Regional Administrator PSCW INPO Support Senices '

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