Morning Report for November 10, 1999
Headquarters Daily Report NOVEMBER 10, 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 - REGION III NOV. 10, 1999 Licensee/Facility: Notification: Consumers Power Co. MR Number: 3-99-0090 Palisades 1 Date: 11/10/99 Covert,Michigan SRI Dockets: 50-255 PWR/CE Subject: PALISADES CONTROL ROD DRIVE MECHANISM OUTAGE ISSUES Reportable Event Number: 36385 Discussion: On November 2, 1999, Palisades personnel Identified a crack indication around the inner diameter of a Control Rod Drive (CRD) motor tube sleeve. A subsequent sample of 15 housings identified 8 additional indications. As a result, the licensee plans to examine all 45 inservice CRDM seal housings and has sent two of the housings offsite for detailed analysis to determine the root cause. The licensee is considering one of 3 options for each indication identified: 1) Replacement of housings with spares, 2) Removal of the defects, or 3) Weld repair of any identified defects, such that all defects will be removed and the welds will meet ASME Code requirements. Also, during the start of the current refueling outage at Palisades, one CRD failed to fall into the core when operators tripped the reactor. The rundown feature drove the rod into the core per the CRDM design. The licensee subsequently discovered that a bearing in the CRDM dual clutch assembly was seized with hardened grease. The licensee sampled other CRDM assemblies and discovered other bearings that exhibited small resistance to rotation. The licensee is presently rebuilding all clutch assemblies (41) except for 5, which were rebuilt in 1996. Regional Action: Regional and NRR staff will monitor both examination, and repair, issues for the CRDM weld indications. Resident inspectors will continue to follow the licensee's actions concerning the CRDM bearings. Contact: ANTON VEGEL (630)829-9620 _
Page Last Reviewed/Updated Wednesday, March 24, 2021
Page Last Reviewed/Updated Wednesday, March 24, 2021