Headquarters Daily Report SEPTEMBER 18, 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 I SEP. 18, 1998 Licensee/Facility: Notification: Consolidated Edison Co. Of N.Y. MR Number: 1-98-0044 Indian Point 2 Date: 09/18/98 Buchanan,New York ENS NOTIFICATION Dockets: 50-247 PWR/W-4-LP Subject: PLANT SHUTDOWN DUE TO CONTAINMENT FAN COOLER HEPA FILTER DEGRADATION Reportable Event Number: 34788 Discussion: At 10 p.m. on Wednesday, September 16, 1998, Consolidated Edison initiated a plant shutdown due to a potential common mode failure mechanism of the containment fan cooler units (FCUs) from degradation of the High Efficiency Particulate Air (HEPA) units. Specifically, on September 13, 1998, Con Edison inspected the 25 FCU following the receipt of a low flow alarm in that FCU. Inspection of the FCU internals found that several of the bottom row HEPA filter units had become water soaked, one of which had failed, leaving elements of the paper in the filter clogging the FCU fan intake screen. The source of the water in the HEPA filters was believed to be a plugged drain on the drain pans for the upstream catch basins for the FCU cooling coils and demisters. Following the replacement of the HEPA filters and tests to confirm proper drainage from the FCU catch basins, the 25 FCU was returned to service. To confirm the extent of condition of this problem, Con Edison subsequently began internal inspections of the other four (4) FCUs, beginning with the 22 FCU. Inspection of that FCU found similar deterioration of the HEPA filters in that unit due to water accumulation. At that point, Con Edson declared the 21- 24 FCUs inoperable after they concluded that this problem was a potential common mode failure mechanism. In accordance with their Tech Specs, a plant shutdown was initiated. As of 10 a.m. on September 17, the plant was in hot shutdown and cooling down. Examination of the 21-24 FCU internals and replacement of deteriorated HEPA filters is currently ongoing as part of Con Edison's root cause evaluation and extent of condition review. Several of the deteriorated HEPA filters have been shipped offsite to a laboratory for analysis. Regional Action: NRC Region I will continue to follow Con Edison's root cause evaluation and extent of condition review in this matter and has discussed the HEPA filter failures with an NRR technical specialist. Contact: John Rogge (610)337-5146 _ REGION III MORNING REPORT PAGE 2 SEPTEMBER 18, 1998 Licensee/Facility: Notification: Indiana MR Number: 3-98-0065 Michigan Electric Co. Date: 09/17/98 Cook 1 2 Via PC Bridgman,Michigan Dockets: 50-315,50-316 PWR/W-4-LP,PWR/W-4-LP Subject: AEP RELEASES REVISED COOK RESTART SCHEDULE Discussion: An updated restart schedule now shows American Electric Power's Cook Nuclear Plant Unit 1 is expected to return to service by the end of first quarter 1999. Previously, Unit 1 was projected to start by the end of 1998. Unit 2 restart should follow Unit 1 by approximately 90 days. The new date is primarily due to a change in the sequencing of repairs and spare parts needs for the ice condenser system, more detailed information about the issues requiring resolution prior to restart and better scheduling information developed from detailed individual job planning. Regional Action: Information Only Contact: E. R. Schweibinz (630)829-9712 _