ENS 42110
ENS Event | |
---|---|
15:37 Oct 7, 2005 | |
Title | Invalid System Actuation |
Event Description | The following information is provided as a 60 day telephone notification to NRC under 10 CFR 50.73(a)(1) in lieu of submitting a written LER to report a condition that resulted in an invalid actuation of the 10CFR50.73(a)(2)(iv)(B) system checked above. NUREG1022 Revision 2 identifies the Information that needs to be reported as discussed below.
(a) The specific train(s) and system(s) that were actuated. On October 7, 2005, at 10:01 EDT, a procedure was started to calibrate the Unit 2 Refueling Floor Vent Exhaust radiation monitors 2D11K611C and K611D. Monitor K611C was tested and restored, and K611D was being tested in the tripped condition. At 10:37, the K611C monitor received a momentary, spurious high radiation signal, or spike. As per design, the high radiation signal resulted in the following automatic actions: Group 2 primary containment isolation valves closed, secondary containment isolated, and both Unit 1 and 2 A and B trains of Standby Gas Treatment initiated. The initiation signal was invalid because it did not result in response to an actual high radiation condition, nor did it trip as a result of any other requirement for initiation of the safety function, such as a downscale or inoperable trip, for example. (b) Whether each train actuation was complete or partial. The four Standby Gas Treatment (SBGT) trains auto started and both Unit 1 and 2 secondary containment fully isolated. This is a complete actuation. The primary containment isolation valve Group 2 isolation was outboard valves only. This is a partial actuation. (c) Whether or not the system started and functioned successfully. The above systems functioned successfully. The licensee notified the NRC Resident Inspector. |
Where | |
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Hatch ![]() Georgia (NRC Region 2) | |
Reporting | |
10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
Time - Person (Reporting Time:+620.15 h25.84 days <br />3.691 weeks <br />0.849 months <br />) | |
Opened: | Paul Underwood 12:46 Nov 2, 2005 |
NRC Officer: | Ronald Harrington |
Last Updated: | Nov 2, 2005 |
42110 - NRC Website
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Unit 2 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 568972023-11-02T01:11:0002 November 2023 01:11:00
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