ENS 42658
ENS Event | |
|---|---|
21:00 Jun 19, 2006 | |
| Title | Initial Part 21 Notification - Prime Measurement Products, Models 763 and 763A Gage Pressure Transmitters and Model 764 Differential Pressure Transmitters |
| Event Description | 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) |
| Where | |
|---|---|
Callaway  Missouri (NRC Region 4) | |
| Reporting | |
| 10 CFR 21.21 | |
| Time - Person (Reporting Time:+37.03 h1.543 days <br />0.22 weeks <br />0.0507 months <br />) | |
| Opened: | Dennis Griffith 10:02 Jun 21, 2006 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Jun 22, 2006 |
| 42658 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Callaway with 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation | |
WEEKMONTHYEARENS 426582006-06-19T21:00:00019 June 2006 21:00:00
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