Morning Report for May 14, 1999
Headquarters Daily Report MAY 14, 1999 *************************************************************************** REPORT NEGATIVE NO INPUT ATTACHED INPUT RECEIVED RECEIVED HEADQUARTERS X REGION I X REGION II X REGION III X REGION IV X PRIORITY ATTENTION REQUIRED MORNING REPORT - HEADQUARTERS MAY 14, 1999 Licensee/Facility: Notification: MR Number: H-99-0044 River Bend Date: 05/14/99 Subject: General Electric Fuel Issues Discussion: On May 12, 1999 members of NRR and Region IV staffs participated in a conference call with members of the River Bend and General Electric (GE) organizations on the status of licensee's investigation of fuel failures that occurred last cycle. Preliminary results indicate that the failures were caused by deposition of a unusually thick layer of crud on the fuel in areas of particularly high heat flux. For reasons not yet fully understood, the thickest depositions and all the cladding failures occurred in first cycle fuel. These depositions were different from those previously seen at River Bend or other GE facilities, in that the coating was less adherent, of much lower density hence the greater thickness and more porous. At the most affected locations the crud thickness on adjacent fuel rods was such that the open flow channel between the rods was significantly reduced. Licensee intends to replace all the affected fuel and to identify the oxide deposition mechanism prior to restart. Samples of the crud and of fuel rods are being transferred to GE facilities at Wilmington and Vallecitos for further examination. Contacts: Margaret Chatterton, NRR (301) 415-2889 Email: msc1@nrc.gov Edward Goodwin, NRR (301) 415-1154 Email: efg@nrc.gov _
Page Last Reviewed/Updated Wednesday, March 24, 2021
Page Last Reviewed/Updated Wednesday, March 24, 2021