Headquarters Daily Report AUGUST 24, 1998 *************************************************************************** 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 AUGUST 24, 1998 Licensee/Facility: Notification: Union Electric Co. MR Number: 4-98-0050 Callaway 1 Date: 08/24/98 Fulton,Missouri SRI notified via telephone Dockets: 50-483 PWR/W-4-LP Subject: LEAK IN THE BORON THERMAL REGENERATION SYSTEM Discussion: On August 20, 1998, a leak developed in the boron thermal regeneration system which resulted in the loss of approximately 250 gallons of reactor coolant system water from the volume control tank. The leak occurred when the system was being placed in service, and the CVCS moderating heat exchanger to reactor coolant system filter control valve did not fully open due to a faulty solenoid in the actuator. This resulted in pressure spiking to approximately 500 psig (normal system pressure is approximately 350 psig). The pressure spike ruptured several diaphragm valve gaskets which provided the path for the leakage into the auxiliary building. The operator observed the decreasing volume control tank level and isolated the system. The licensee repaired the faulty and damaged valves and returned the system to service. No further problems were noted. Regional Action: The resident inspectors will continue to monitor the licensee's actions. Contact: David Passehl (573)676-3181 David Graves (817)860-8141 _ REGION IV MORNING REPORT PAGE 2 AUGUST 24, 1998 Licensee/Facility: Notification: Washington Public Power Supply System MR Number: 4-98-0051 Washington Nuclear 2 Date: 08/24/98 Richland,Washington Call from SRI Dockets: 50-397 BWR/GE-5 Subject: WNP-2 RESTART FROM FORCED OUTAGE Discussion: On August 20, 1998, Washington Public Power Supply System returned Washington Nuclear Project, Unit 2 (WNP-2) to power operations after a 13-day forced outage.The outage, required by plant Technical Specifications, was entered due to operability concerns with the Division II emergency diesel generator. While making repairs to the emergency diesel generator, the licensee also repaired a reactor coolant system pressure boundary leak in the drywell that was identified subsequent to the shutdown. The leak was on a socket weld for a 3/4" instrument sensing line for a recirculation loop. Finally, the station vital batteries were tested satisfactorily. These tests were required to re-establish compliance with the battery surveillance program required by Technical Specifications (re: NOED 98-6-012). Mode 1 operation was achieved at 2:35 a.m. on August 22, and 100 percent power was reached at 11:30 a.m. on August 23. Regional Action: For information only. Contact: H. J. Wong (925)975-0296 S. A. Boynton (509)377-2627 _