Morning Report for October 12, 1999
Headquarters Daily Report OCTOBER 12, 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 I OCTOBER 12, 1999 Licensee/Facility: Notification: Northeast Utilities MR Number: 1-99-0039 Millstone 1 Date: 10/12/99 Waterford,Connecticut Dockets: 50-245 BWR/GE-3 Subject: FUEL POOL CRANE FAILURE Discussion: Millstone Unit 1 is permanently shut down and has initiated the decommissioning process. On Monday, October 11, the licensee was moving a new fuel assembly out of the spent fuel pool, where it was stored, and into the new fuel storage vault. During this move, however, the reactor building crane auxiliary hook continued to drift downward past the stop point and the fuel assembly came in contact with the refuel floor for a short period of time. All fuel movements with the crane have been halted pending the licensee's determination of the cause of the crane failure, and completion of appropriate corrective measures. Prior to the crane problem and subsequent placement of the affected assembly into the storage vault, the licensee had succesfully transferred 16 assemblies from the spent fuel pool to the new fuel vault. There was no visible damage to the new assembly and no radiological consequences from this event. NRC informed the State of Connecticut Regional Action: The resident inspector is following licensee actions to investigate the crane problem. Contact: Todd Jackson (610)337-5308 Paul Cataldo (860)447-3170 _ REGION II MORNING REPORT PAGE 2 OCTOBER 12, 1999 Licensee/Facility: Notification: Virginia Power Co. MR Number: 2-99-0015 Surry 1 2 Date: 10/12/99 Surry,Virginia Dockets: 50-280,50-281 PWR/W-3-LP,PWR/W-3-LP Subject: LOSS OF NORMAL FEED TO SURRY UNIT 1 H AND UNIT 2 J EMERGENCY BUSSES Discussion: On October 9, 1999, at 12:41 pm., the cabling between the C reserve station service transformer (RSST) buss work and the emergency switchgear experienced an internal fault and caused a transformer lockout. The C RSST is the normal feed for the Unit 1 H and Unit 2 J emergency busses. The #1 and #3 emergency diesel generators (EDGs) started on undervoltage to supply the Unit 1 H and the Unit 2 J busses respectively. Prior to the event both Units 1 and 2 were at 100 percent power. There were no unexpected effects on Unit 1; however, Unit 2 power decreased to approximately 96 percent due to the momentary power lost to a turbine electro-hydraulic control panel before the #3 EDG re-energized the J buss. Unit 2 was restored to 100 percent power approximately two hours later. Both units continued full power operation with the #1 and #3 EDGs powering their associated emergency busses until approximately noon on October 11 when the C RSST was restored to full service. The cable fault was between the cable conductor and the cable aluminum shielding at the point where the cable is attached to a lug. The licensee suspects that a breakdown of the insulation and protective covering at this location occurred. Samples of the material have been sent offsite for evaluation. While the C RSST was out of service, the material at all twelve connection points was replaced. Regional Action: Routine followup. Contact: Robert C. Haag (404)562-4550 _
Page Last Reviewed/Updated Wednesday, March 24, 2021
Page Last Reviewed/Updated Wednesday, March 24, 2021