Event Notification Report for April 21, 2010
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
04/20/2010 - 04/21/2010
EVENT NUMBERS
45862
General Information or Other
Event Number: 45862
Rep Org: WATERFORD STEAM ELECTRIC STATION
Licensee: TYCO ELECTRONICS
Region: 4
City: KILLONA State: LA
County:
License #:
Agreement: Y
Docket: 05000382
NRC Notified By: WILLIAM HARDIN
HQ OPS Officer: DONG HWA PARK
Licensee: TYCO ELECTRONICS
Region: 4
City: KILLONA State: LA
County:
License #:
Agreement: Y
Docket: 05000382
NRC Notified By: WILLIAM HARDIN
HQ OPS Officer: DONG HWA PARK
Notification Date: 04/21/2010
Notification Time: 10:35 [ET]
Event Date: 04/21/2010
Event Time: 00:00 [CDT]
Last Update Date: 04/21/2010
Notification Time: 10:35 [ET]
Event Date: 04/21/2010
Event Time: 00:00 [CDT]
Last Update Date: 04/21/2010
Emergency Class: NON EMERGENCY
10 CFR Section:
21.21 - UNSPECIFIED PARAGRAPH
10 CFR Section:
21.21 - UNSPECIFIED PARAGRAPH
Person (Organization):
JACK WHITTEN (R4DO)
PART 21 (EMAI)
JACK WHITTEN (R4DO)
PART 21 (EMAI)
HIGH FAILURE RATE OF NORMALLY ENERGIZED ELECTRO-PNEUMATIC TIME DELAY RELAYS
The following was received via facsimile:
"Waterford 3 has observed a higher than expected failure rate of normally energized Tyco model E7024PB electro-pneumatic time delay relays produced since 2007. Seven of the eight failures were observed on 2007 or newer date code relays and one was observed on a 2004 date code relay. Waterford 3 had 33 Tyco model E7024PB time delay relays installed in the plant. The Agastat E7000 series timing relay consists of two basic operating types, On-Delay and Off-Delay. The On-Delay models provide a delay period of contact re-positioning on energization and no time delay upon de-energization. The Off-Delay models provide a delay period of contact re-positioning on de-energization and no time delay upon energization. These relays may be ordered with various electrical characteristics suitable for use specific to each application. The early-in-life failures have been observed on Tyco model E7024PB relays designed as an Off-Delay, 4 pole double throw, 125 VDC operating coil, with a time delay range of 0.5 to 5 seconds.
"All failed relays were replaced. Post failure bench testing at Waterford 3, Tyco, or independent Failure Analysis has not consistently repeated the failures."
See EN #44684 for Part 21 reported by Tyco Electronics.
The following was received via facsimile:
"Waterford 3 has observed a higher than expected failure rate of normally energized Tyco model E7024PB electro-pneumatic time delay relays produced since 2007. Seven of the eight failures were observed on 2007 or newer date code relays and one was observed on a 2004 date code relay. Waterford 3 had 33 Tyco model E7024PB time delay relays installed in the plant. The Agastat E7000 series timing relay consists of two basic operating types, On-Delay and Off-Delay. The On-Delay models provide a delay period of contact re-positioning on energization and no time delay upon de-energization. The Off-Delay models provide a delay period of contact re-positioning on de-energization and no time delay upon energization. These relays may be ordered with various electrical characteristics suitable for use specific to each application. The early-in-life failures have been observed on Tyco model E7024PB relays designed as an Off-Delay, 4 pole double throw, 125 VDC operating coil, with a time delay range of 0.5 to 5 seconds.
"All failed relays were replaced. Post failure bench testing at Waterford 3, Tyco, or independent Failure Analysis has not consistently repeated the failures."
See EN #44684 for Part 21 reported by Tyco Electronics.