Headquarters Daily report AUGUST 04, 1995 *************************************************************************** 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 III AUGUST 4, 1995 Licensee/Facility: Notification: Commonwealth Edison Co. MR Number: 3-95-0128 Zion 1 2 Date: 08/04/95 Zion,Illinois SRI VIA PC Dockets: 50-295,50-304 PWR/W-4-LP,PWR/W-4-LP Subject: PERSONNEL CHANGES Reportable Event Number: N/A Discussion: The following personnel change was announced August 2 and will be effective Monday, August 7, 1995. Bill Fitzpatrick will become the Operations Manager, replacing Bob Cascarano who has been acting as Operations Manager since June 1995. Mr. Fitzpatrick was an Executive Assistant to Mr. Mike Wallace since October 1994. Mr. Cascarano will assume responsibilities of the Assistant to the Operations Manager. Regional Action: Information Only Contact: L.F. MILLER, JR. (708)829-9629 PRIORITY ATTENTION REQUIRED MORNING REPORT - REGION III AUGUST 4, 1995 Licensee/Facility: Notification: Indiana MR Number: 3-95-0129 Cook 1 Date: 08/04/95 Bridgman,Michigan N/A Dockets: 50-315 PWR/W-4-LP Subject: POST MAINTENANCE TESTING ON AN EMERGENCY DIESEL GENERATOR Reportable Event Number: N/A Discussion: On August 2, 1995, after the licensee completed maintenance on the "AB" emergency diesel generator turbocharger, the resident inspectors raised a concern regarding the post maintenance test that was performed. The licensee had performed the maintenance in response to a recent failure of a similarly designed turbocharger at the McGuire plant. The failure was attributed to a design change to an insert that provided starting air to the turbocharger during initial roll-up to assist in getting it up to operating speed. The new insert caused the compressor impeller blades to reach resonance frequency at normal turbocharger operating speed, resulting in excessive vibration and fatigue failure of the blades. During the maintenance activity, the licensee replaced the insert with the design previously used and inspected the impeller blades to ensure that they were not damaged. The licensee's post maintenance test consisted of a slow start and full load run. The inspectors questioned the licensee concerning the adequacy of the post maintenance test since starting air is not provided to the insert during a slow start test. The licensee subsequently successfully completed a fast start and run. Regional Action: For Information Only Contact: WAYNE KROPP (708)829-9633 PRIORITY ATTENTION REQUIRED MORNING REPORT - REGION IV AUGUST 4, 1995 Licensee/Facility: Notification: Texas Utilities Electric Co. MR Number: 4-95-0096 Comanche Peak 1 2 Date: 08/04/95 Glen Rose,Texas Licensee Notified Resident Insp. Dockets: 50-445,50-446 PWR/W-4-LP,PWR/W-4-LP Subject: OVERFLOWING OF UNIT 1 SPENT FUEL POOL Reportable Event Number: N/A Discussion: On August 3, while testing Refueling Water Purification Pump X-02, the licensee mispositioned a valve in the pump discharge line that resulted in the transfer of approximately 10,000 gallons of water from the Refueling Water Storage Tank (RWST) to the Unit 1 spent fuel pool. The spent fuel pool filled to the ventilation duct level and overflowed by way of the ventilation ducts into the floor drain system. The event was detected at 3:17 p.m. (CDT), when personnel observed an overflowing floor drain in the Fuel Building. Pump X-02 was stopped and the mispositioned valve was identified and properly positioned. During the evolution, the RWST level decreased from 96 percent to 94 percent. The licensee entered TS 3.5.4.a, which required a minimum level of 95 percent. RWST level was restored and the limiting condition for operation was exited within the 1 hour allowed by the Action statement. Spent Fuel Pool level had stabilized to a level approximately 1/2 inch below the ventilation duct, terminating the leakage from the pool. The event was apparently the result of operator error during system alignment. The spent fuel pool high level alarm setpoint was above the level at which water would be introduced into the ventilation system. The licensee was investigating the operator performance error and the fuel pool high level alarm setpoint rationale. Regional Action: The Resident Inspectors will monitor the licensee's activities and corrective actions. Contact: A. T. Gody, Jr. (817)897-1500 PRIORITY ATTENTION REQUIRED MORNING REPORT - REGION IV AUGUST 4, 1995 Licensee/Facility: Notification: Nebraska Public Power District MR Number: 4-95-0097 Cooper 1 Date: 08/04/95 Brownville,Nebraska SRI Dockets: 50-298 BWR/GE-4 Subject: INOPERABLE HIGH PRESSURE COOLANT INJECTION (HPCI) SYSTEM Reportable Event Number: 29154 Discussion: In Event Number 29154, the licensee reported that the Cooper Nuclear Station HPCI was rendered inoperable due to the potential for waterhammer in the HPCI turbine exhaust line. Water is accumulating in the line from two sources: steam leakage past the turbine admission valve and a siphon effect which drains water up the line from the torus following test runs. The exhaust line vacuum breakers are apparently not functional. The acceleration of water in the exhaust line on a HPCI restart could cause excessive loading on the turbine exhaust line. The inoperable HPCI system places the unit in a Technical Specifications 7-day shutdown Limiting Condition for Operation. The HPCI is currently in pull-to-lock and danger-tagged shut. Operations continues to drain the accumulated water. Licensee contract personnel have calculated that all structural piping supports in the exhaust line downstream of the HPCI turbine would be overloaded upon a HPCI restart resulting in 100 percent turbine demand assuming the amount of water estimated to be collecting in the piping (120 gal.). The allowable stresses on some supports would be exceeded by a factor of 5. The licensee is planning corrective actions to install a mechanical/hydraulic ramp mechanism on the turbine governor (GE SIL480), which would moderate the exhaust line pressure increase applied to the static water, and to reinforce at least one piping support. Presently, the licensee does not plan to correct the causes for the water accumulation within the 7-day time frame. Regional Action: The Region is planning a special inspection to assess the safety significance of the condition, the licensee corrective actions, and the licensee actions that led to the condition. Contact: T. Reis (817)860-8185