ENS 46444
ENS Event | |
|---|---|
11:00 Nov 30, 2010 | |
| Title | Loss of Power to Instrumentation in the Operating Units of the Feed Materials Building |
| Event Description | Description of the Event: This report is performed pursuant to 10 CFR 40.60(b)(2) reporting requirements.
On Tuesday, November 30, 2010, at approximately 0500, the failure of F-Substation caused a loss of instrumentation in operating units in the Feed Materials Building. At 0505, various weight, temperature and pressure indications were not available. Due to the loss of power to a load cell component, the UF6 Vaporizer weight exceeded the administrative limit. During the power loss the vessel's weight measurement was not available to the operator. At 0538, power was restored and instrumentation readings returned to normal. The loss of the Vaporizer weight control did not have any safety consequences. Isotope, Quantities and Chemical Form: No material release. Personnel Radiation Exposure Date (if applicable): No additional exposure to radiation or radioactive materials. The licensee will inform the NRC Region II Office.
On December 1, 2010, Honeywell Metropolis Works made notification of Event #46444 to the NRC Operations Center. This November 30, 2010 incident occurred due to the loss of power to a load cell component. During the power loss the weight measurement was not available to the operator, and the UF6 Vaporizer weight exceeded the administrative limit. This twenty-four hour report was made following 10 CFR 40.60(b)(2) reporting requirements: Each licensee shall notify the NRC within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the discovery of any of the following events involving licensed material: ... (2) An event in which equipment is disabled or fails to function as designed when: (i) The equipment is required by regulation or license condition to prevent releases exceeding regulatory limits, to prevent exposures to radiation and radioactive materials exceeding regulatory limits, or to mitigate the consequences of an accident; (ii) The equipment is required to be available and operable when it is disabled or fails to function; and (iii) No redundant equipment is available and operable to perform the required safety function. As determined by Honeywell's safety analysis, potential UF6 release may occur due to failure to control process resulting in process vessel failure. UF6 Vaporizer load cells, which are identified in the safety analysis as a safety feature to control the total weight in this vessel, were not operable during the incident. However, load cells are not the only component designed to perform the equivalent safety function - to prevent UF6 Vaporizer failure. Thus, UF6 Vaporizer failure due to over-pressurization is prevented by the existing relief system which is designed to relieve at a pressure below the maximum allowable working pressure. This Vaporizer relief system was available and operable during the event. As a result of these additional considerations, Honeywell determined that the redundant equipment (Vaporizer relief system) was available and operable to perform the required safety function (Vaporizer failure prevention), and therefore the initially reported incident (# 46444) does not meet the reporting requirement (iii). Since this incident does not constitute a reportable event, Honeywell requests to withdraw its event notification#46444. Notified R2DO(Henson) and NMSS EO(Davis) |
| Where | |
|---|---|
| Honeywell International, Inc. Metropolis, Illinois (NRC Region 2) | |
| License number: | SUB-526 |
| Reporting | |
| 10 CFR 40.60(b)(2) | |
| Time - Person (Reporting Time:+28.33 h1.18 days <br />0.169 weeks <br />0.0388 months <br />) | |
| Opened: | Mark Wolf 15:20 Dec 1, 2010 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Dec 20, 2010 |
| 46444 - NRC Website | |
Honeywell International, Inc. with 10 CFR 40.60(b)(2) | |
WEEKMONTHYEARENS 565862023-06-21T20:30:00021 June 2023 20:30:00
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