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| Start date | Reporting criterion | Title | Event description | System | LER | |
|---|---|---|---|---|---|---|
| ENS 42658 | 19 June 2006 21:00:00 | 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation | Initial Part 21 Notification - Prime Measurement Products, Models 763 and 763A Gage Pressure Transmitters and Model 764 Differential Pressure Transmitters | This report is made per 10CFR21.21 Notification of failure to comply or existence of a defect and its evaluation. Callaway Plant received a notification dated May 18, 2006, from PRIME Measurement Products (formerly ITT Barton) stating Barton Model 763 and 763A Gage Pressure Transmitters and Model 764 Differential Pressure Transmitters may have defective external lead-wire connectors, which could affect their performance during an accident. The notification provided by PRIME stated the affected transmitters were manufactured after May 1982 and shipped from the factory prior to April 1, 2006. The potential defect is characterized as follows: The transmitters' external lead wires enter the electronics enclosure through a hermetic seal called a connector assembly. The external lead wires are soldered to the glass sealed pins of the hermetic seal. Epoxy potting is used to structurally support the soldered wire connections and establish a seal to protect the solder connections from shorting, which could be caused by an electrically conductive accident environment. The defect is that the insulated portions of the wires in the connectors, manufactured after May 1982, may not be embedded deeply enough into the epoxy potting to provide an electrical connection that would not be affected in an accident environment. The notification also states that actual transmitter installation may preclude shorting of exposed conductors due to the existence of conduit, conduit seals, and special wire connectors which could protect the exposed wires at a defective connector from conductive moisture. Callaway Plant identified thirty applicable Barton transmitters and connector assemblies in warehouse stock. Inspections of these operational spare parts identified three connectors, which had exposed conductors external to their seal. One connector had this defect on one lead wire and two connectors had this defect on both lead wires. Callaway has also identified that thirty-nine potentially affected transmitters are installed in the plant. An inspection plan has been developed to perform the required inspections, based on safety significance, ALARA considerations, and potential accident environmental conditions. Additional reporting requirements associated with the installed components will be evaluated under 10CFR50.72 as required. On 06/19/06, Callaway Plant personnel completed evaluations and determined the defective connections constitute a defect per 10CFR21 require initial NRC notification within two days. The NRC resident inspectors have been notified of this issue.
This report is a revision to report EN # 42658 reported on 06/21/2006. Added statement: "The suppliers of the identified transmitters were Prime Measurement Products and Westinghouse Electric Corporation. The licensee notified the NRC Resident Inspector. Notified NRR (O. Tabatabai), R4 DO (D. Graves) | ||
| ENS 42151 | 17 November 2005 14:30:00 | 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation | Initial Part 21 Notification - Prime Measurement Products, Models 763 & 763A Pressure Transmitters and Model 764 Differential Pressure Transmitters | The following information was received via facsimile: On 11/2/05 SGT LLC, primary contractor for Steam Generator replacements at Callaway Plant, received notification from PRIME Measurement Products, (formerly ITT Barton) of a manufacturing defect in Model 763, 763A, and 764 pressure transmitters involving use of Zener diodes that were not in compliance with purchase specifications. Subsequently, on 11/3/05 SGT LLC notified AmerenUE Callaway Plant of the potential manufacturing defects involving the aforementioned transmitters. These transmitters provide input to steam generator level indication and control functions. The notification provided by PRIME stated the purchasing specifications required JANTX components, but in some cases commercial variations of the required parts were used to manufacture some transmitters. This condition was potentially reportable under 10 CFR 21, depending on the specific application at facilities using these instruments manufactured by PRIME Measurement Products. The following is a summary of the information obtained from PRIME Measurement Products: 1. This notification involves 76 specific transmitters manufactured between 2/10/04 and 9/19/05. 2. Each transmitter contains two Zener diodes which may not comply with purchase specifications. 3. The JANTX Zener diodes are different in appearance with respect to the commercial variations. Some JANTX Zener diodes used in the recent past have bodies that are solid orange or light blue in color or clear glass. The commercial Zener diodes in question have a clear glass body. The commercial Zener diode is larger (0.095" diameter X 0.275" long) than the smaller JANTX Zener diode (0.072" diameter X .155" long). 4. The existence of the commercial Zener diode can be confirmed by removal of the transmitter electronics cover and observing the Zener diodes at locations CR2 and CR3, as shown on manufacturer supplied circuit board drawings. 5. The Zener diodes are not field replaceable, as it is necessary to electronically reestablish the calibration zero which will likely necessitate replacement of a calibration resistor. This calibration resistor is located in a temperature sensitive portion of the electronic circuit and requires thermal performance validation. 6. PRIME believes that transmitters with commercial Zener diodes that are currently installed in a plant can be relied upon to continue to operate and perform their safety-related function in the event of an accident. This belief is based on the facts that the commercial Zener diodes installed in any transmitter have been shown to be functional at the accident maximum sustained temperature and because the radiation effects on commercial Zener diodes are known to be within the margin of the original Barton qualification. SGT LLC purchased 22 of the suspect transmitters for use in the Callaway Plant Steam Generator replacement project. Additionally, 6 suspect transmitters had been supplied directly to Callaway Plant. Physical inspections by SGT LLC and Callaway Plant staff determined 21 of the transmitters had the commercial Zener diodes installed. These transmitters were returned to PRIME where the commercial Zener diodes were replaced with qualified Zener diodes and proper transmitter operation was verified. The affected transmitters have since been returned to Callaway as fully qualified for safety related use in nuclear applications. On 11 /16/05, Callaway Plant personnel completed evaluations and determined the use of commercial Zener diodes constituted a defect per 10 CPR 21, requiring initial notification to the NRC within two days. Per the information provided by PRIME, all other affected customers have been notified. The concern was identified while Callaway Plant was shutdown for a refueling outage when the transmitters were installed, and prior to being returned to service. Therefore, no other reporting criteria apply. The NRC Resident Inspectors have been notified of this issue. | Steam Generator | |
| ENS 40344 | 20 November 2003 16:20:00 | 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation | Low Voltage Circuit Breaker Defect and Noncompliance Report | Deviation related to upper stud assemblies for General Electric Nuclear AKR-30 low voltage circuit breakers. The deviation is specific to upper stud assemblies supplied under part number Q139C4632G1 and consist of an incorrect angle between the stud and pivot. Of the fifteen assemblies supplied with possible deviations to AmerenUE, five were returned and ten had been installed in Callaway Plant. The deviation will not prevent the circuit breakers from performing their design basis function at the Callaway Plant, however, the capability of the assemblies is indeterminate for severe faulted conditions. A circuit breaker could fail if an upper stud assembly with identified deviation was installed and the circuit breaker was called upon to interrupt a severe fault. Callaway has concluded that this deviation does not constitute a "defect" as defined in 10CFR Part 21 because the breakers would still perform their design basis requirements and would not create a substantial safety hazard. However, Callaway can not determine if the potential for a significant safety hazard or exceeding of a technical specification safety limit could exist at another nuclear power plant. Received written documentation that the licensee has notified the NRC resident inspector. | ||
| ENS 40283 | 29 October 2003 06:00:00 | 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation | 10 Cfr 21 Notification for Ge Magne-Blast Breaker Tube and Piston Assemblies | This notice is being sent within the two day period to inform you of a safety concern related to tube and piston assemblies for GE Magne-Blast breakers (model AM-4.16-350-2h medium voltage circuit breaker). The concern is specific to tube and piston assemblies supplied under part number Q0213X0343R094. All five assemblies supplied to AmerenUE contain a dimensional design error which would cause the assembly to interfere and bind with the circuit breaker movable contact assembly, which would render the breaker inoperative. All basic components with the defect at Callaway were returned to GENE . . .. |