ENS Event | |
|---|---|
07:01 Aug 22, 2003 | |
| Title | Invalid Actuation of the "a" Standby Service Water System |
| Event Description | On August 22,2003, at 0201 Central Time, while operating at 100 percent power, Grand Gulf Nuclear Station experienced an invalid actuation of the 'A' Standby Service Water (SSW) System. A failed DC/DC converter power supply in Panel 1H22P400 for the Division 1 Diesel Generator (DG) resulted in a faulty DG speed monitor signal indicating DG speed greater than 450 revolutions per minute (RPM). The DG was not running since it was already inoperable due to a planned outage. The event occurred during restoration activities to prepare the DG for retest. The invalid DG start signal caused the outside air fan and SSW 'A' to auto start as designed to support DG operation. SSW 'A' started and functioned as designed. No other actuations occurred and all support systems functioned properly.
The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Grand Gulf  Mississippi (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+133.67 h5.57 days <br />0.796 weeks <br />0.183 months <br />) | |
| Opened: | Gary Ingram 20:41 Aug 27, 2003 |
| NRC Officer: | Arlon Costa |
| Last Updated: | Aug 27, 2003 |
| 40108 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 402662003-09-27T06:18:00027 September 2003 06:18:00
[Table view]10 CFR 50.73(a)(1), Submit an LER Invalid High Pressure Core Spray (Hpcs) Actuation During Surveillance Testing ENS 401082003-08-22T07:01:00022 August 2003 07:01:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of the "a" Standby Service Water System 2003-09-27T06:18:00 | |