ENS 40266
ENS Event | |
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06:18 Sep 27, 2003 | |
Title | Invalid High Pressure Core Spray (Hpcs) Actuation During Surveillance Testing |
Event Description | This report is being made under 10CFR50.73 (a) (2) (iv) (A).
On September 27, 2003, at 0118 hours0.00137 days <br />0.0328 hours <br />1.951058e-4 weeks <br />4.4899e-5 months <br /> Central Time, while operating at 100 percent power, Grand Gulf Nuclear Station experienced an invalid actuation of the High Pressure Core Spray (HPCS) System. The invalid signal was the result of an error made while performing a continuity check during a quarterly surveillance. The invalid HPCS initiation caused the following systems to actuate: HPCS Pump, Division III Diesel Generator (DG) and Standby Service Water (SSW) 'C' (as designed to support DG operation). Each train actuation was complete, HPCS started and functioned as designed and all support systems functioned properly. There was an unexpected HPCS pump suction valve transfer to Suppression Pool. The most probable cause of this valve transfer was minor oscillation in Suppression Pool level. The licensee informed the NRC Resident Inspector. |
Where | |
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Grand Gulf Mississippi (NRC Region 4) | |
Reporting | |
10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
Time - Person (Reporting Time:+581.93 h24.247 days <br />3.464 weeks <br />0.797 months <br />) | |
Opened: | William B. Abraham 12:14 Oct 21, 2003 |
NRC Officer: | Steve Sandin |
Last Updated: | Oct 21, 2003 |
40266 - NRC Website
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Unit 1 | |
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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 | |