Headquarters Daily report MAY 28, 1998 *************************************************************************** REPORT NEGATIVE NO INPUT ATTACHED INPUT RECEIVED RECEIVED HEADQUARTERS X REGION I X REGION II X REGION III X REGION IV X *************************************************************************** PRIORITY ATTENTION REQUIRED MORNING REPORT - REGION I MAY 28, 1998 Licensee/Facility: Notification: Consolidated Edison Co. Of N.Y. MR Number: 1-98-0028 Indian Point 2 Date: 05/28/98 Buchanan,New York SRI PC Dockets: 50-247 PWR/W-4-LP Subject: GAS TURBINE GENERATOR TEST FAILURE/BREAKER INTERLOCK DESIGN VULNERABILITY (REFER TO EVENT NOS. 34283/34285 Reportable Event Number: N/A Discussion: On May 22, 1998, gas turbine generator No. 3 (GT-3) was operated to test a modification to the auto-synchronizing relays and was successfully paralleled with the 13.8 kilovolt (KV) bus while the bus was energized; however, auto-synchronizing failed when attempting a dead bus transfer to the 13.8 KV bus. This was the first time that a dead bus transfer had been attempted with this gas turbine since a new control system was installed in 1992. GT-3 was declared inoperable as a result of this test failure. An extent of condition inspection conducted on May 23 failed to demonstrate that GT-2 would be capable of performing a dead bus transfer and it was subsequently declared inoperable. Operability of GT-1 was confirmed on May 24, 1998, when it was tested and successfully transferred onto a dead bus. Indian Point 2 has three gas turbine generators (GT), which provide a source of emergency electrical power during station blackout conditions and certain Appendix R fire scenarios as well as serve as peaking power units. GT-1 is located within the protected area while GT-2 and GT-3 are locate approximately one mile from the plant in the Buchanan switchyard. All three GT's have Woodward digital control systems. During troubleshooting conducted on May 27 by Consolidated Edison and the vendor of the digital controller (Woodward), it was determined that an interlock on the GT-3 output breaker prevents the breaker from closing if there is a reverse power condition on the 13.8 KV bus. The interlock logic receives an input from a real power meter which is powered from the 13.8 KV bus and has an output of 4 milliamps (mA) at zero megawatts (MW). When the meter is de-energized, the output is 0 mA which is interpreted by the controller as a reverse power condition; therefore the interlock is never satisfied when the bus is dead. An additional interlock prevents closure of the breaker onto a dead bus if there is voltage on any phase of the bus. During troubleshooting, residual voltage was observed on one phase which did not satisfy the interlock since there is no dead band on this logic gate to allow for instrument drift. Con Edison verified that Woodward controller for GT-1 is configured differently than GT-3 and would not experience these same problems. However, while the real power meter for GT-2 is configured differently than GT-3, the set-up of the other breaker interlock is identical. Presently, GT-2 and GT-3 are inoperable while GT-1 remains operable. This configuration is allowed by Technical Specifications for the current plant condition. Regional Action: The resident inspectors are on-site following Con Edison's trouble-shooting efforts and corrective actions for this test failure on GT-3 as well as the interlock design vulnerabilities identified on both GT-2 & GT-3. Contact: Scott Schwind (914)739-9360 PRIORITY ATTENTION REQUIRED MORNING REPORT - REGION III MAY 28, 1998 Licensee/Facility: Notification: United States Enrichment Corporation MR Number: 3-98-0039 Paducah Gaseous Diffusion Plant Date: 05/27/98 Paducah,Kentucky SRI Dockets: 07007001 Subject: SITE MANAGEMENT CHANGE Reportable Event Number: N/A Discussion: Mr. Steve Polston, General Manager of the Paducah Gaseous Diffusion Plant, has accepted a position with a different employer and will be leaving his current position in mid-July. Mr. Polston is the senior Paducah site manager for Lockheed Martin Utility Services, the principle site contractor. The Paducah Plant is managed by the United States Enrichment Corporation. No plans for a replacement have been announced. Regional Action: Information Only Contact: PAT HILAND (630)829-9603