ENS 48350

v t e ENS Event
15:01 Sep 27, 2012
Title	Error in Main Steam Line High Flow Calculational Methodology
Event Description	The following information was received by facsimile: GEH [General Electric Hitachi] has recently discovered that calculations of choked flow rate in the Main Steam Line (MSL) of GEH BWRs may not be conservative, with the potential impacts to be evaluated for existing MSL high-flow setpoints and Analytical Limits (ALs). GEH has not completed the evaluation of this condition to determine reportability under 10CFR Part 21 and is therefore issuing this 60-day Interim Notification. GEH will close or issue an update on this matter on or before December 12, 2012. Given the early status of the evaluation, GEH has no recommended actions at this time. This 60-day Interim Notification is issued in accordance with 10CFR Part 21.21(a)(2), and will be sent to all GE BWR/2-6 plants and ABWR plants. Affected plants include the following: Nine Mile 1-2, Fermi 2, Columbia, Grand Gulf, River Bend, FitzPatrick, Pilgrim, Vermont Yankee, Clinton, Dresden 2-3, LaSalle 1-2, Limerick 1-2, Oyster Creek, Peach Bottom 2-3, Quad Cities 1-2, Perry 1, Duane Arnold, Cooper, Susquehanna 1-2, Brunswick 1-2, Hope Creek, Hatch 1-2, Browns Ferry 1-3, and Monticello.

ENS 48350 +/-
Where
Ge Hitachi Nuclear Energy Wilmington, North Carolina (NRC Region 1)
Organization:	Ge Hitachi Nuclear Energy
Reporting

10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component
Time - Person (Reporting Time:+-4 h-0.167 days <br />-0.0238 weeks <br />-0.00548 months <br />)
Opened:	Dale Porter 11:01 Sep 27, 2012
NRC Officer:	Vince Klco
Last Updated:	Sep 27, 2012
48350 - NRC Website
v • d • e

v t e Emergency Notification System
Ge Hitachi Nuclear Energy with 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component
WEEKMONTHYEAR2017-02-27T04:00:00 [Table view]
[ENS list for Ge Hitachi Nuclear Energy]

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