ENS 40266

v t e ENS Event
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.

ENS 40266 +/-
Where
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
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v • d • e

v t e Emergency Notification System
Grand Gulf with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2003-09-27T06:18:00 [Table view]
[ENS list for Grand Gulf]

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