Headquarters Daily Report SEPTEMBER 10, 1997 *************************************************************************** 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 - REGION IV SEP. 10, 1997 Licensee/Facility: Notification: Omaha Public Power District MR Number: 4-97-0069 Ft Calhoun 1 Date: 09/10/97 Fort Calhoun,Nebraska RI VIA TELEPHONE CALL FROM LICENSEE Dockets: 50-285 PWR/CE Subject: PLANT SHUTDOWN DUE TO CONDENSER TUBE LEAK Discussion: The licensee was operating at approximately 55 percent power with Main Condenser B drained in order to repair a main condenser backwash outlet valve. Increasing levels of sodium were detected in steam generator blowdown chemistry, and a power reduction to less than 30 percent was initiated at approximately 9:29 p.m. (CDT) on September 9 to comply with Chemistry Action Level 2. Chemistry Action Level 2 directs that power be reduced to less than 30 percent if sodium levels exceed 50 ppb. Sodium levels continued to increase, and the licensee decided to shut down the plant in order to identify and repair the suspected tube leak on Main Condenser A. Sodium levels peaked at 158 ppb in Steam Generator A and 165 ppb in Steam Generator B. Mode 2 was entered at 3:05 a.m., and Mode 3 was entered at 3:46 a.m. on September 10. The plant is currently in Mode 3 with Reactor Coolant System temperature being maintained via the steam dump bypass valves. As of this morning, the licensee planned to complete the repair on the condenser backwash outlet valve, restore Main Condenser B, and then locate and repair the tube leak on Main Condenser A. Regional Action: The resident inspector is monitoring the licensee's activities. Contact: V. G. Gaddy (402)426-9611 _ REGION III MORNING REPORT PAGE 2 SEPTEMBER 10, 1997 Licensee/Facility: Notification: Indiana MR Number: 3-97-0094 Michigan Electric Co. Date: 09/08/97 Cook 1 2 50.72 CALL Bridgman,Michigan Dockets: 50-315,50-316 PWR/W-4-LP,PWR/W-4-LP Subject: POST ACCIDNET ECCS SYSTEMS POTENTIALLY INOPERABLE Discussion: At 4:55 p.m. EDT on September 8, 1997, a dual unit shutdown was commenced due to concerns over operability of the Emergency Core Cooling Systems (ECCS). Inadequate communication may exist between areas of containment to allow a sufficient volume of water to drain to the containment sump to support ECCS systems in the recirculation mode. At 8:00 p.m. EDT, both units entered Technical Specification 3.0.3 and a Notice of Unusual Event (NUE) was declared due to both trains of ECCS and containment spray (CTS) being inoperable. The potential exists during a small or large break loss of coolant accident that a sufficient volume of water may not drain back to the recirculation sump. The containment drainage system is designed to ensure that water entering the containment from a breach of the reactor coolant system, ECCS injection and ice condenser melt flows back into the containment recirculation sump via drains. Analysis was unable to confirm that sufficient communication existed between all areas of containment to ensure adequate drainage to the recirculation sump. Without adequate drainage to the sump, a low level may result which could jeopardize long term operation of the ECCS and CTS pumps due to vortexing and air entrainment in the suction lines. Outage maintenance scope has not yet been determined. Regional Action: The resident inspectors and the Architect Engineering Inspection will evaluated the licensee analysis and corrective actions. Contact: B. BURGESS (630)829-9629 _