Headquarters Daily Report OCTOBER 23, 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 23, 1996 MR Number: H-96-0078 NRR DAILY REPORT ITEM GENERIC COMMUNICATIONS NRC Information Notice 96-55, "Inadequate Net Positive Suction Head of Emergency Core Cooling and Containment Heat Removal Pumps Under Design Basis Accident Conditions," dated October 22, 1996. The NRC is issuing this information notice to alert addressees to recent discoveries by licensees that the available net positive suction head requirements for emergency core cooling system and containment heat removal pumps may not be adequate under all postulated design basis scenarios. Technical contacts: Howard Dawson, NRR (301) 415-3138 William Long, NRR (301) 415- 3026 _ REGION II MORNING REPORT PAGE 2 OCTOBER 23, 1996 Licensee/Facility: Notification: Virginia Power Co. MR Number: 2-96-0099 North Anna 1 2 Date: 10/23/96 Richmond,Virginia Dockets: 50-338,50-339 PWR/W-3-LP,PWR/W-3-LP Virginia Power Co. Surry 1 2 Surry,Virginia Dockets: 50-280,50-281 PWR/W-3-LP,PWR/W-3-LP Subject: CORPORATE MANAGEMENT CHANGE Discussion: Virginia Electric and Power Company announced that Mr. Robert F. Saunders, Vice President Nuclear Operations, will become Vice President Nuclear Engineering and Services. Mr. Michael R. Kansler, Vice President Nuclear Engineering and Services, will become Vice President Nuclear Operations. These changes are effective on November 1, 1996. Regional Action: Information only. Contact: Perry Hopkins (404)331-5568 _ REGION II MORNING REPORT PAGE 3 OCTOBER 23, 1996 Licensee/Facility: Notification: MR Number: 2-96-0100 Nuclear Fuel Services, Inc. Date: 10/23/96 Erwin,Tennessee Dockets: 07000143 License No: SNM-124 Subject: UNINTERRUPTIBLE POWER SUPPLY SYSTEM MALFUNCTION Discussion: At 12:21 p.m. on October 22, 1996, the licensee notified the NRC of a malfunction of their Uninterruptible Power Supply (UPS) system (EN31190). Maintenance had been performed on the backup power generator to install an oil heater in preparation for cold weather. Upon completion of the maintenance activity, the UPS system was tested to verify its operability. During the testing at 11:42 a.m. that morning, the system failed to properly switch to the backup power generator causing a loss of power to plant safety and security systems for four minutes. The systems that were affected included security detection, criticality safety alarm and fire protection detection. The criticality safety alarm system provided visual and audible indication of system unavailability. The plant fire safety system, and the security systems (central and secondary alarm stations, perimeter intrusion detection, and security lighting) were also without power during this time. Immediate compensatory actions were taken by the licensee's security staff in response to the event. The criticality alarm and fire protection system were functionally tested after restoration of power and found to be operating properly. The switching system which activates the backup generator upon loss of power is tested weekly. The licensee stated there were no similar problems during previous tests. The cause of the malfunction is currently under investigation by the licensee. No fuel processing was occurring at the facility at the time of the malfunction. Regional Action: The region followup included discussions with the licensee on the circumstances surroundng the malfunction. The regional staff will followup on the results of the licensee's investigation during the next inspection, and will verify that corrective actions have been taken. Contact: D. AYRES (404)331-7514 _ REGION II MORNING REPORT PAGE 4 OCTOBER 23, 1996 Licensee/Facility: Notification: Carolina Power & Light Co. MR Number: 2-96-0101 Robinson 2 Date: 10/23/96 Hartsville,South Carolina Dockets: 50-261 PWR/W-3-LP Subject: WATER HAMMER Discussion: On 10/16/96 when completing back leakage tests for the two of RCS isolation valves for the "A" safety injection (SI) Accumulator, a water hammer event occurred. The line had been depressurized and partially drained for the test. Restoration was to refill the line by opening the MOV discharge valve from "A" Accumulator which was pressurized to 600 psig. The MOV takes about 10 seconds to open fully. Operators in containment reported a rumbling noise when the valve opened. The licensee walked down all three accumulator discharge lines to the reactor coolant system cold leg, lines cross-connecting the accumulators, and portions of the residual heat removal system inside containment connecting with the system. The inspections revealed damage to a seismic restraint support downstream of the "A" accumulator discharge valve which consisted of a bent lug capture plate; an abandoned welded pipe attachment that was bent; and minor spalling of grout and concrete at the embedment plate with no undercutting of the embedment noted. Welded pipe attachments on the remaining seismic restraint supports were visually inspected and no signs of damage were found. Hot load spring settings were observed to be within the required range. The damage to the welded pipe attachment was repaired by grinding down the broken welded pipe attachment and repairing the bent lug capture plate. Repairs were examined utilizing the dye penetrant examination method and were found to be acceptable. The licensee determined that the damage observed was due to a larger water hammer than experienced previously. The piping and supports were restored to the original design requirements. Regional Action: Resident Inspector walked down piping systems following repair and participated in followup of welded supports inspection. The Resident Inspector will continue followup of corrective actions. Contact: Frank Jape (404)331-5649 _