ENS 55314

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v t e ENS Event
04:00 Feb 18, 2021
Title	Part 21 Report
Event Description	The following is a summary of a report received from the vendor via email: The vendor notified the NRC that the hydraulic loss coefficient used to calculate the pressure loss and flow rate into the Side Entry Orifice (SEO) at the fuel bundle entrance in BWR/6 plants may have been underpredicted. The SEO loss coefficient was underpredicted for some fuel bundle locations, which could result in an overprediction of MCPR margin in core monitoring applications. The overprediction was a result of not originally including in the assessment flow area restrictions associated with instrument support structures in the cross beams (structural supports underneath the core plate) in BWR/6 plant designs. BWR/2-5 plants built by GE have a different core support structure that is more open so that multiple SEO losses are not applied to evaluations for those plants. However, there are currently no US ABWR plants in operation that would potentially be affected by this evaluation. The potential error in the core monitoring system does not affect the NRC certified design of the ABWR or the GEH ABWR design certification renewal application currently under review. The unique core support structure design of the BWR6 and ABWR is not shared by earlier BWR plants or the ESBWR. Potentially Affected Plants: Grand Gulf, River Bend, Clinton, Perry Point of Contact: Michelle Catts GE Hitachi Nuclear Energy Safety Evaluation Program Manager 3901 Castle Hayne Road, Wilmington, NC 28401

ENS 55314 +/-
Where
Ge Hitachi Nuclear Energy Wilmington, North Carolina (NRC Region 1)
Organization:	Ge Hitachi Nuclear Energy
Reporting

10 CFR 21.21(d)(3)(i), Failure to Comply or Defect
Time - Person (Reporting Time:+2867.43 h119.476 days <br />17.068 weeks <br />3.928 months <br />)
Opened:	Jim Harrison 14:26 Jun 17, 2021
NRC Officer:	Jeffrey Whited
Last Updated:	Jun 17, 2021
55314 - NRC Website
v • d • e

v t e Emergency Notification System
Ge Hitachi Nuclear Energy with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect
WEEKMONTHYEAR2021-02-18T04:00:00 [Table view]
[ENS list for Ge Hitachi Nuclear Energy]

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