ENS Event | |
|---|---|
05:00 Feb 12, 2010 | |
| Title | Interim Report Concerning an Issue in Sump Blockage Generic Tests |
| Event Description | Westinghouse is evaluating an identified inconsistency between test assumptions and the test rig configurations used for Generic Safety Issue (GSI) 191, "Assessment of Debris Accumulation on PWR Sump Performance," testing. Specifically, this issue is related to jet impingement zone-of-influence (ZOI) tests and it applies to testing done for coatings and insulation.
Prior to discovery of the inconsistency, Westinghouse provided letters to the utilities to summarize the testing, analyze the test results, and propose acceptable ZOIs to support resolution of the ZOI aspect of GSI-191. The ZOI tests assumed the smallest diameter in the nozzle producing the jet to be at the nozzle. Westinghouse discovered however, that the inner diameter of an upstream component was smaller than the nozzle. This inconsistency may have resulted in undersized ZOIs being proposed in the letters. Westinghouse has not yet concluded its determination as to whether there is a defect as defined by 10 CFR 21. Westinghouse has been working with the Pressurized Water Reactors Owners Group and the NRC NRR Safety Issues Resolution Branch to resolve general test protocol issues and establish methods to evaluate the test results in terms of ZOIs.
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| Where | |
|---|---|
| Westinghouse Electric Company Pittsburgh, Pennsylvania (NRC Region 1) | |
| Organization: | Westinghouse Electric Company |
| Reporting | |
| 10 CFR 21.21 | |
| Time - Person (Reporting Time:+8.67 h0.361 days <br />0.0516 weeks <br />0.0119 months <br />) | |
| Opened: | J.A. Gresham 13:40 Feb 12, 2010 |
| NRC Officer: | Pete Snyder |
| Last Updated: | Feb 16, 2010 |
| 45697 - NRC Website | |
Westinghouse Electric Company with 10 CFR 21.21 | |
WEEKMONTHYEARENS 457762010-03-18T04:00:00018 March 2010 04:00:00
[Table view]10 CFR 21.21 Defect Concerning Failure of Relay to Release When De-Energized ENS 456972010-02-12T05:00:00012 February 2010 05:00:00 10 CFR 21.21 Interim Report Concerning an Issue in Sump Blockage Generic Tests 2010-03-18T04:00:00 | |