Event Notification Report for July 31, 2000
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
07/30/2000 - 07/31/2000
General Information or Other
Event Number: 37275
Rep Org: EATON CUTLER-HAMMER
Licensee: EATON CUTLER-HAMMER
Region: 1
City: WARRENDALE State: PA
County:
License #:
Agreement: N
Docket:
NRC Notified By: LAURENCE PATTERSON
HQ OPS Officer: LEIGH TROCINE
Licensee: EATON CUTLER-HAMMER
Region: 1
City: WARRENDALE State: PA
County:
License #:
Agreement: N
Docket:
NRC Notified By: LAURENCE PATTERSON
HQ OPS Officer: LEIGH TROCINE
Notification Date: 08/30/2000
Notification Time: 15:06 [ET]
Event Date: 07/31/2000
Event Time: 00:00 [EDT]
Last Update Date: 08/30/2000
Notification Time: 15:06 [ET]
Event Date: 07/31/2000
Event Time: 00:00 [EDT]
Last Update Date: 08/30/2000
Emergency Class: NON EMERGENCY
10 CFR Section:
21.21 - UNSPECIFIED PARAGRAPH
10 CFR Section:
21.21 - UNSPECIFIED PARAGRAPH
Person (Organization):
PETE ESELGROTH (R1)
CAUDLE JULIAN (R2)
MELVYN LEACH (R3)
CHUCK PAULK (R4)
VERN HODGE (via fax) (NRR)
PETE ESELGROTH (R1)
CAUDLE JULIAN (R2)
MELVYN LEACH (R3)
CHUCK PAULK (R4)
VERN HODGE (via fax) (NRR)
10 CFR PART 21 NOTIFICATION REGARDING THE POTENTIAL FAILURE OF EATON-CUTLER-HAMMER DS-206 CIRCUIT BREAKERS TO CLOSE ON DEMAND
The following text is a portion of a facsimile received from Eaton Cutler-Hammer Nuclear Programs personnel:
"The following information is provided pursuant to the requirements of 10 CFR Part 21 to report a potential safety concern. This issue concerns the possibility for malfunction of the Eaton Cutler-Hammer DS-206 circuit breakers due to 'shock-out' of Direct Trip Actuators (DTA). Shock-out is defined as the unwarranted or undesired change in the state of a DTA from the normally un-tripped state to a tripped state. Shock-out occurs as a result of shock caused by the circuit breaker cycling from the open position to the closed position. The shock force is supplied by the closing springs striking the bottom plate of the breaker frame during the breaker closing operation. The result of shock-out is that the DTA trips immediately, returning the breaker to an open condition, which is neither required nor desired."
"[Eaton Cutler-Hammer Nuclear Programs (C-HNP)] has determined that the root cause of DTA shock-out in DS-206 breakers is the replacement of operating mechanisms and/or closing springs with new operating mechanisms and/or new closing springs, as part of the standard reconditioning process. DTA shock-out has not been observed in vintage DS-206 breakers that are reconditioned in accordance with C-HNP procedures, which does not include the replacement of operating mechanisms and/or closing springs as part of the standard reconditioning process. The standard C-HNP reconditioning process DOES include installation of design upgrades."
"To eliminate the possibility of shock-out, when the DS-206 breaker reconditioning process includes installation of a new operating mechanism and/or closing springs, C-HNP recommends the installation of a modified bottom plate to eliminate transmission of shock to the DTA. A modified bottom plate has been designed, [and] tested and is being seismically qualified by C-HNP."
"This deficiency was identified and determined to be of a chronic reportable nature on approximately July 31, 2000."
"The installed base of the C-HNP supplied operating mechanisms and closing springs is limited to a single utility and plant, Tennessee Valley Authority Sequoyah Nuclear Plant. C-HNP does not know where operating mechanisms and closing springs, procured commercially by third party dedicators, may have been installed in safety-related applications."
(Contact the NRC operations officer for supplier contact information.)
The following text is a portion of a facsimile received from Eaton Cutler-Hammer Nuclear Programs personnel:
"The following information is provided pursuant to the requirements of 10 CFR Part 21 to report a potential safety concern. This issue concerns the possibility for malfunction of the Eaton Cutler-Hammer DS-206 circuit breakers due to 'shock-out' of Direct Trip Actuators (DTA). Shock-out is defined as the unwarranted or undesired change in the state of a DTA from the normally un-tripped state to a tripped state. Shock-out occurs as a result of shock caused by the circuit breaker cycling from the open position to the closed position. The shock force is supplied by the closing springs striking the bottom plate of the breaker frame during the breaker closing operation. The result of shock-out is that the DTA trips immediately, returning the breaker to an open condition, which is neither required nor desired."
"[Eaton Cutler-Hammer Nuclear Programs (C-HNP)] has determined that the root cause of DTA shock-out in DS-206 breakers is the replacement of operating mechanisms and/or closing springs with new operating mechanisms and/or new closing springs, as part of the standard reconditioning process. DTA shock-out has not been observed in vintage DS-206 breakers that are reconditioned in accordance with C-HNP procedures, which does not include the replacement of operating mechanisms and/or closing springs as part of the standard reconditioning process. The standard C-HNP reconditioning process DOES include installation of design upgrades."
"To eliminate the possibility of shock-out, when the DS-206 breaker reconditioning process includes installation of a new operating mechanism and/or closing springs, C-HNP recommends the installation of a modified bottom plate to eliminate transmission of shock to the DTA. A modified bottom plate has been designed, [and] tested and is being seismically qualified by C-HNP."
"This deficiency was identified and determined to be of a chronic reportable nature on approximately July 31, 2000."
"The installed base of the C-HNP supplied operating mechanisms and closing springs is limited to a single utility and plant, Tennessee Valley Authority Sequoyah Nuclear Plant. C-HNP does not know where operating mechanisms and closing springs, procured commercially by third party dedicators, may have been installed in safety-related applications."
(Contact the NRC operations officer for supplier contact information.)
Power Reactor
Event Number: 37200
Facility: CLINTON
Region: 3 State: IL
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: ROBERT POWERS
HQ OPS Officer: DOUG WEAVER
Region: 3 State: IL
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: ROBERT POWERS
HQ OPS Officer: DOUG WEAVER
Notification Date: 07/31/2000
Notification Time: 12:11 [ET]
Event Date: 07/31/2000
Event Time: 10:18 [CDT]
Last Update Date: 07/31/2000
Notification Time: 12:11 [ET]
Event Date: 07/31/2000
Event Time: 10:18 [CDT]
Last Update Date: 07/31/2000
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(1)(v) - EMERGENCY SIREN INOP
10 CFR Section:
50.72(b)(1)(v) - EMERGENCY SIREN INOP
Person (Organization):
JAMES CREED (R3)
JAMES CREED (R3)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
EMERGENCY SIRENS INOPERABLE
On 7/31/00, a system test of the emergency sirens was conducted. During this test it was discovered that a large number of emergency sirens are not functioning. It is believed that the sirens are not functional due to a lightning strike which occurred during storms which passed through the area last night.
The licensee notified the NRC resident inspector and Dewitt County.
* * * UPDATE AT 2317 ON 7/31/00 BY FUNKHOUSER RECEIVED BY WEAVER * * *
The sirens were restored at approximately 1600 CDT on 7/31/00. The licensee notified the NRC resident inspector. The NRC Operations Officer notified the R3DO (Jim Creed).
On 7/31/00, a system test of the emergency sirens was conducted. During this test it was discovered that a large number of emergency sirens are not functioning. It is believed that the sirens are not functional due to a lightning strike which occurred during storms which passed through the area last night.
The licensee notified the NRC resident inspector and Dewitt County.
* * * UPDATE AT 2317 ON 7/31/00 BY FUNKHOUSER RECEIVED BY WEAVER * * *
The sirens were restored at approximately 1600 CDT on 7/31/00. The licensee notified the NRC resident inspector. The NRC Operations Officer notified the R3DO (Jim Creed).