ENS 42285
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ENS Event | |
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01:32 Jan 25, 2006 | |
Title | Invalid High Pressure Core Spray (Hpcs) Initiation Signal During Surveillance Testing |
Event Description | 50.72 (b) (3) (vi) Non-Emergency 8Hr Reportable
When I&C was performing STP-051-4256, HPCS Drywell Pressure High Channel Calibration and Logic System Functional Test (B21-N067R, B21-N667R), a human performance error resulted in an invalid HPCS initiation signal. Division III diesel generator and the HPCS pump started. The HPCS injection valve stroked open and was manually overridden closed after full open indication, thus HPCS system injection was terminated. HPCS System was unavailable due to being overridden with an initiation signal present from 1932 until 2109 [CST] for a total of 1 Hr and 37 minutes. NUREG 1022 states that single-train systems that perform safety functions (i.e., HPCS), when lost, prevents the fulfillment of the safety function of that system. The licensee informed the NRC Resident Inspector. |
Where | |
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River Bend Louisiana (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
Time - Person (Reporting Time:+0.02 h8.333333e-4 days <br />1.190476e-4 weeks <br />2.7396e-5 months <br />) | |
Opened: | Chad G. Blanchard 01:33 Jan 25, 2006 |
NRC Officer: | Steve Sandin |
Last Updated: | Jan 25, 2006 |
42285 - 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 %) |
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