Headquarters Daily report MAY 31, 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 MAY 31, 1995 Licensee/Facility: Notification: Consumers Power Co. MR Number: 3-95-0099 Palisades 1 Date: 05/31/95 Covert,Michigan 05/24/95-RESIDENT Dockets: 50-255 PWR/CE Subject: COOLDOWN RATE EXCEEDED IN LOCALIZED AREA OF PRESSURIZER. Reportable Event Number: N/A Discussion: On May 24, with a cooldown of the primary coolant system (PCS) and pressurizer in progress, the cooldown limit of 100 degree per hour was exceeded in a localized area in the pressurizer vapor space at the top of the pressurizer. During the cooldown evolution, a 110 degree F divergence in temperature between the pressurizer liquid and vapor spaces occurred indicating the presence of noncondensible gases at the top of the pressurizer. Operators then directed reinitiation of degas activities and vented off the hot 321 degree F gas bubble, replacing it with cooler 211 degree F liquid. The licensee recently submitted a Technical Specification amendment to change the 200 degree heatup and cooldown rate for the pressurizer to a 100 degree heatup and cooldown rate limit. However, the amendment was submitted in error since the licensee intended a 200 degree cooldown limit and 100 degree heatup limit. The requested amendment was approved by NRR and instead of submitting a correction, the licensee changed the applicable operating procedure to reflect the new 100 degree cooldown limit. Plant engineers plan to evaluate the effect that the cooldown on the pressurizer. Regional Action: Routine resident inspector followup will include a review of the licensee's assessment of this event. Contact: D.G. PASSEHL (616)764-8971 PRIORITY ATTENTION REQUIRED MORNING REPORT - REGION III MAY 31, 1995 Licensee/Facility: Notification: Commonwealth Edison Co. MR Number: 3-95-0100 Dresden 2 3 Date: 05/31/95 Morris,Illinois RESIDENT INSPECTOR Dockets: 50-237,50-249 BWR/GE-3,BWR/GE-3 Subject: MANAGEMENT CHANGES Reportable Event Number: N/A Discussion: The licensee announced the following management changes: Mr. John Heffley, previously the Unit 3 Station Manager, has been appointed Station Manager responsible for Units 2 and 3; Mr. Richard Bax, previously the Unit 2 Station Manager, is now responsible for the Unit 2 refuel outage and reports to Mr. Heffley; Mr. Tim O'Connor, previously the Unit 2 Operations Manager, is now the Operations Manager responsible for Units 2 and 3; and Mr. Jerry Tietz, previously the Unit 3 Operations Manager, will now provide support to operations. In addition the licensee has placed one Shift Manager in charge of both units. Two Unit Supervisors in the Control Room for each shift will remain and will report to the Shift Manager. Regional Action: Information Only. Contact: P.L. HILAND (708)829-9603 PRIORITY ATTENTION REQUIRED MORNING REPORT - REGION IV MAY 31, 1995 Licensee/Facility: Notification: Arizona Public Service Co. MR Number: 4-95-0077 Palo Verde 1 Date: 05/31/95 Wintersburg,Arizona Call from Senior Resident Inspector Dockets: 50-528 PWR/CE80 Subject: REACTOR TRIP ON LOW STEAM GENERATOR LEVEL Reportable Event Number: 28870 Discussion: On May 30, 1995, at 10:42 p.m. (MST), while performing troubleshooting on the hydraulic actuation system of feedwater isolation Valve SGB-137, the valve went closed and caused a low steam generator condition. This caused a trip of the Unit 1 reactor which was at 65 percent power following startup from a refueling outage. The trip was determined to be uncomplicated and safety systems performed as intended. The licensee's preliminary root cause investigation identified that a loose wire on a terminal board may have caused closure of the valve. While the troubleshooting work on the valve's hydraulic system should not have by itself caused valve closure, the combination with the loose wire appears to have actuated a solenoid valve in the hydraulic system which caused the valve to close. The licensee is continuing with their root cause investigation. Regional Action: The Senior Resident Inspector responded to the site and the resident inspectors continue to monitor the licensee's evaluation of the reactor trip event. Contact: H. Wong (510)975-0296 K. Johnston (602)386-3650