ENS 41455

v t e ENS Event
08:00 Jan 27, 2005
Title	Part 21 Report Concerning Mcpr Limits and Mcpr Monitoring
Event Description	On 01/27/05, Framatome ANP determined that a deviation exists in the interpolation scheme for the minimum critical power ratio (MCPR) within a range of fuel bundle flows for several operating plants. The condition could be experienced during startup, shutdown, or for other generally very infrequent reasons with core flows in the 30-45% range. The error has no impact on reactor operation above 45% flow. The defect involves the MCPR operating limit and the monitoring of that limit. The plants where the MCPR operating limit was affected are Browns Ferry Unit 3 and Grand Gulf. The plants where the steady state MCPR predicted by the monitoring system was affected are Browns Ferry Unit 3, Columbia Generating Station, Grand Gulf, LaSalle Unit 2, and River Bend. All affected plants have been notified. Recommendations for compensatory actions have been provided to those plants (Grand Gulf and River Bend) where the impact of the error is evident for current and future cycle exposures. Compensatory measures have been provided to the affected plants for use until the incore monitoring code can be updated at each plant.

ENS 41455 +/-
Where
Framatome Anp Richland Richland, Washington (NRC Region 2)
License number:	SNM-1227
Reporting

10 CFR 21.21
Time - Person (Reporting Time:+820.45 h34.185 days <br />4.884 weeks <br />1.124 months <br />)
Opened:	Jerald Holm (Via Fax) 12:27 Mar 2, 2005
NRC Officer:	Jeff Rotton
Last Updated:	Mar 2, 2005
41455 - NRC Website
v • d • e

v t e Emergency Notification System
Framatome ANP Richland with 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation
WEEKMONTHYEAR2005-11-15T08:00:00 [Table view]
[ENS list for Framatome ANP Richland]

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