Headquarters Daily Report OCTOBER 03, 1996 *************************************************************************** REPORT NEGATIVE NO INPUT ATTACHED INPUT RECEIVED RECEIVED HEADQUARTERS û REGION I û REGION II û REGION III û REGION IV û PRIORITY ATTENTION REQUIRED MORNING REPORT - HEADQUARTERS OCTOBER 3, 1996 MR Number: H-96-0071 NRR DAILY REPORT ITEM GENERIC COMMUNICATIONS NRC Information Notice 96-40, Supplement 1, "Deficiencies in Material Dedication and Procurement Practices and in Audits of Vendors," dated October 7, 1996. The NRC is issuing this supplement to correct an inspection date that was incorrectly reported in Attachment 1 to Information Notice (IN) 96-40 and to discuss further the applicability of the material dedication concerns identified in IN 96-40 to the individual suppliers identified in Attachment 1 to that notice. Technical contacts: Uldis Potapovs, NRR (301) 415-2959 Larry Campbell, NRR (301) 415-2976 _ REGION IV MORNING REPORT PAGE 2 OCTOBER 3, 1996 Licensee/Facility: Notification: Entergy Operations, Inc. MR Number: 4-96-0104 Arkansas Nuclear 1 Date: 10/03/96 Russelville,Arkansas Resident Inspector Dockets: 50-313 PWR/B&W-L-LP Subject: EXCESSIVE LEAKAGE OF ULTIMATE HEAT SINK DUE TO FOULING BY ZEBRA MUSSELS Discussion: On September 22, 1996, the licensee made an Event Notification identifying excessive leakage through a sluice gate that compromised the water inventory assumptions for the emergency cooling pond (ECP). The inventory assumptions for the ECP require enough service water to accommodate a loss-of-coolant accident on one unit and to shutdown the other unit from 100 percent power coincident with losing the Lake Dardanelle Reservoir. The inventory assumptions also include a leakage limit of 75 gpm total from the ECP through the sluice gates that separate the service water bays from the Lake Dardanelle Reservoir. The licensee notified the commission that the as-found leakage through one Unit 1 sluice gate was 103 gpm. The licensee also identified a significant increase of zebra mussels in the circulating water bay since the last refueling outage. The licensee believes that the sluice gate was leaking because of zebra mussel shells preventing it from sealing properly at the bottom. The licensee tested another sluice gate on Unit 1 and determined the as-found leakage to be 41 gpm. After operations manually raised the gate slightly and then manually closed it, leakage dropped to 7 gpm. The licensee used divers and inspected the three Unit 2 sluice gates and found that the seating surfaces were clear on these sluice gates. In the last 3 months, the service water pump strainers have indicated high differential pressure alarms when performing the routine surveillance test. The licensee believes that the high differential pressure alarms occur when the water source is switched from the lake to the ECP and back to the lake, which stirs up the debris in the service water bays leading to the filters becoming clogged. The licensee planned inspections of the service water bays as followup action on the alarms during the Unit 1 outage. The licensee has inspected the Unit 1 service water bays and noted significant amounts of dead zebra mussel shells and silt present. Regional Action: The inspectors will followup on the licensee's safety evaluation for the as-found leakage and proposed actions to reduce the effects of the zebra mussels. Contact: Elmo Collins (817)860-8291 _