ENS 45296
ENS Event | |
|---|---|
07:00 Jun 30, 2009 | |
| Title | Part 21 - Radiation Monitor Defect |
| Event Description | The defect is contained in the General Atomics Electronic Systems, Inc (GA-ESI) radiation monitoring system model RM-80 firmware. The RM-80 firmware anomaly was initially identified at the St. Lucie Nuclear Power Plant. The radiation monitor was part of the control room outside air intake ventilation radiation monitors.
More specifically, if the radiation monitor is already in a high and or alert alarm state, and subsequently suffers a loss of power, then upon restoration of power to the unit, the RM-80 high and or alert alarm relays are not reenergized by the RM-80 firmware. This in turn prevents the relays that are located in the [RM]-80 from performing their safety related function. This error in the firmware only affects those plant sites that connect annunciator panels or other safety related equipment to the RM-80 Alert and High Alarm relays. Plant sites that use RM-80 radiation monitors will be advised to test their systems for this anomaly. When so requested, GA-ESI will provide all necessary information to plants on how to test their RM-80 radiation monitors, and how to receive firmware upgrades if the condition is found during testing. General Atomics will notify the following affected plants: Beaver Valley, Braidwood, Byron, Callaway, Indian Point 2 &3, Limerick, River Bend, Shearon Harris, South Texas, St. Lucie, Waterford, and Wolf Creek.
This notification is an update to a notification made on 1506 Hrs. EST on August 25, 2009 regarding the existence of a defect. This notification is being provided in compliance with the requirements of Title 10 Code of Federal Regulations Part 21.21. In the initial notification, under the section titled 'Locations affected by the reported condition,' General Atomics Electronic Systems, Inc. (GA-ESI) provided a table (Table1) that listed sites and corresponding firmware sets having safety related RM-80 software that had been found to contain the reported firmware anomaly. GA-ESI has now identified one additional firmware set that should be included in Table 1. The site is Braidwood and the firmware set is bhr165/01. Accordingly, Table 1 has been revised to include this firmware set for the Braidwood site. The revised Table 1 is attached to this update notification. Also, please note that earlier today, August 31, 2009, GA-ESI emailed a notification letter to its customer contact at the Braidwood site. All other information remains the same as was initially reported on August 25, 2009 Notified R3DO (Lipa). Also notified NRR and NRO via email. |
| Where | |
|---|---|
| General Atomics San Diego, California (NRC Region 4) | |
| Organization: | General Atomics |
| Reporting | |
| 10 CFR 21.21 | |
| Time - Person (Reporting Time:+1352.28 h56.345 days <br />8.049 weeks <br />1.852 months <br />) | |
| Opened: | Keith Asmussen 15:17 Aug 25, 2009 |
| NRC Officer: | Vince Klco |
| Last Updated: | Aug 31, 2009 |
| 45296 - NRC Website
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General Atomics with 10 CFR 21.21 | |
WEEKMONTHYEARENS 452962009-06-30T07:00:00030 June 2009 07:00:00
[Table view]10 CFR 21.21 Part 21 - Radiation Monitor Defect 2009-06-30T07:00:00 | |