ENS 46372
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ENS Event | |
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15:45 Oct 28, 2010 | |
Title | Standby Liquid Control System Test Tank Seismic Analysis Faulty |
Event Description | This report is being made pursuant to 10CFR50.72(b)(3)(v), Event or Condition that could have prevented fulfillment of a Safety Function. As part of a recent NRC Component Design Basis Inspection (CDBI), the seismic analysis of the Unit One and Unit Two Standby Liquid Control (SBLC) system test tanks was questioned. During the formal operability determination process initiated on 10/27/10, Engineering was verifying design data and calculations. During this review, on 10/28/10, Engineering determined that the historical calculation used the wrong formula in determining the test tank's natural frequency. The consequence is that if the test tank is filled with water, the possibility exists that the test tank could fall over or collapse during a seismic event and adversely affect adjacent safety-related items (i.e. SBLC). Calculations confirm that empty test tanks are seismically qualified.
The SBLC test tanks on both units had been drained of water on 10/27/10 and thus both Unit One and Unit Two SBLC systems are fully operable at this time. The licensee has notified the NRC Resident Inspector. |
Where | |
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Lasalle ![]() Illinois (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
LER: | 05000331/LER-2010-006 05000373/LER-2010-003 |
Time - Person (Reporting Time:+-0.4 h-0.0167 days <br />-0.00238 weeks <br />-5.4792e-4 months <br />) | |
Opened: | Mark Zickefoose 15:21 Oct 28, 2010 |
NRC Officer: | John Knoke |
Last Updated: | Oct 28, 2010 |
46372 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Unit 2 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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