Headquarters Daily Report OCTOBER 01, 1997 *************************************************************************** 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 - HEADQUARTERS OCTOBER 1, 1997 Licensee/Facility: Notification: Part 21 Database MR Number: H-97-0120 Fisher Valve Date: 10/01/97 Subject: Part 21 - Auxiliary feedwater steam admission valve unseated inadvertently Discussion: VENDOR: Fisher Valve PT21 FILE NO: 97-61-0 DATE OF DOCUMENT: 05/15/97 ACCESSION NUMBER: 9705210044 SOURCE DOCUMENT: LER 50-446/97-01 REVIEWER: PECB, J. Carter NEW ISSUE. The Comanche Peak Unit 2 licensee reports that the auxiliary feedwater turbine steam admission valve failed open due to leakage through the valve diaphragm, starting the turbine driven auxiliary feedwater pump. Water flowed to all four steam generators for 30 - 40 seconds until the flow control valves were closed. Later, this valve came off its closed seat due to leakage through a newly replaced diaphragm but no water flowed into the steam generators. The licensee attributes the cause to susceptibility of the new "thick" replacement diaphragms developed by the valve vendor to under torquing (pullout) and over torquing (crush). The auxiliary feedwater system remained capable of performing its intended safety function throughout the event. A replacement "thin" diaphragm (original design) has been obtained and installed in the valve. _ HEADQUARTERS MORNING REPORT PAGE 2 OCTOBER 1, 1997 Licensee/Facility: Notification: Part 21 Database MR Number: H-97-0121 General Electric Date: 10/01/97 Subject: Part 21 - Short circuit of coil of Type CR120AD relays Discussion: VENDOR: General Electric PT21 FILE NO: 97-62-0 DATE OF DOCUMENT: 06/12/97 ACCESSION NUMBER: 9706190261 SOURCE DOCUMENT: LETTER REVIEWER: PECB, D. Skeen NOT A NEW ISSUE BUT FIRST TIME REPORTED UNDER 10 CFR 21. The licensee reports failures of Type CR120AD relays because of a a manufacturing defect; specifically, part of the start-end pigtail of the relay coils was off the insulating lead pad and, therefore, lay directly on the outer layer of the winding. This configuration placed insulation on the affected length of magnet wire in a high-electrical-stress condition that led to dielectric breakdown at the failure site, thus effectively short circuiting the coil. _ HEADQUARTERS MORNING REPORT PAGE 3 OCTOBER 1, 1997 Licensee/Facility: Notification: Part 21 Database MR Number: H-97-0122 Kerotest Date: 10/01/97 Subject: Part 21 - Charging check valve would not open completely Discussion: VENDOR: Kerotest PT21 FILE NO: 97-63-0 DATE OF DOCUMENT: 07/28/97 ACCESSION NUMBER: 9708050112 SOURCE DOCUMENT: LER 50-361/97-01 REVIEWER: PECB, J. Carter NEW ISSUE. The licensee reports that a Kerotest check valve in the charging system would not open completely, possibly due to a design defect. This would cause the charging flow distribution to the reactor coolant system differ from that assumed in the safety analysis. _ HEADQUARTERS MORNING REPORT PAGE 4 OCTOBER 1, 1997 Licensee/Facility: Notification: Part 21 Database MR Number: H-97-0123 Fafnir Date: 10/01/97 Subject: Part 21 - Replacement bearings for Limitorque actuators would not rotate freely Discussion: VENDOR: Fafnir PT21 FILE NO: 97-65-0 DATE OF DOCUMENT: 08/11/97 ACCESSION NUMBER: 9708150316 SOURCE DOCUMENT: LETTER REVIEWER: PECB, C. Petrone NEW ISSUE. During refurbishment of a safety related Limitorque actuator, the Comanche Peak licensee noted that replacement Fafnir S7K bearings (part number RGP2559) obtained from the warehouse did not rotate freely. _