Part 21 Report - 1998-730
12/10/1998
U.S. Nuclear Regulatory Commission Operations Center Event Report
Page 1
| Other Nuclear Material | Event# | 35129 |
| Rep Org: | FISHER-ROSEMOUNT | | Notification Date / Time: | 12/09/1998 12:17 (EST) |
| Licensee: | FISHER-ROSEMOUNT | | Event Date / Time: | 12/09/1998 11:17 (CST) |
| Region: | 3 | | Last Modification: | 12/09/1998 |
| | | Docket #: | |
| City: | Eden Prairie | | Agreement State: | No |
| County: | | | License # | |
| State: | MN | | Notifications: | MARK RING R3 |
| NRC Notified by: | JERRY HANSON | | | VERN HODGE NRR |
| HQ Ops Officer: | JOHN MacKINNON | | | JOHN ROGGE R1 |
| Emergency Class: | NON EMERGENCY | | | DAVID GRAVES R4 |
| 10 CFR Section: | | | | CHARLES OGLE R2 |
| 21.21 | UNSPECIFIED PARAGRAPH |
| | 10 CFR PART 21 REPORT REGARDING ROSEMOUNT MODEL 710 TRIP UNITS |
Rosemount Nuclear Instrumentation, Inc. (RNII) has determined that they have a potential deviation related to certain 710DU0TS 4-20 mA master trip units. A jumper wire (J1) may be incorrectly installed on the circuit card assembly (CCA) of the master trip units. This jumper should only be installed on the CCA's of Mode 710DU0TS slave trip units. This jumper bypasses a buffer circuit that serves to protect the 1-5 volt bus of the master trip unit from electrical faults on a slave unit(s). This circuit configuration places the master trip unit in an unqualified (untested) condition and may expose the master trip unit to an unanalyzed failure mode.
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