ENS 40641: Difference between revisions
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| facility = Paducah Gaseous Diffusion Plant | | facility = Paducah Gaseous Diffusion Plant | ||
| Organization = | | Organization = | ||
| license number = | | license number = GDP-1 | ||
| region = 2 | | region = 2 | ||
| state = Kentucky | | state = Kentucky | ||
| Line 16: | Line 16: | ||
| event date = 04/04/2004 14:30 CDT | | event date = 04/04/2004 14:30 CDT | ||
| last update date = 04/29/2004 | | last update date = 04/29/2004 | ||
| title = 24-Hour Nrc Bulletin 91-01 Loss | | title = 24-Hour Nrc Bulletin 91-01 Loss of Criticality Control Notification | ||
| event text = At 1430, on 04-04-04 the Plant Shift Superintendent was notified of a violation of Nuclear Criticality Safety (NCS) control in the C-333 process building. While preparing for start up of the C-333 #1 High Speed Purge and Evacuation (P & E) pump, operations discovered that the delta pressure (DP) alarm instrument line to the RCW supply was unattached and the isolation valve was closed. With the RCW instrument line not attached, both DP alarms for this pump were not functional and therefore not able to perform their safety function, violating a safety related item (SRI) in NCSE 039. The SRI requires that both DP alarms be functional while the P & E is isolated from the cascade. The purpose of the SRI Is to alert the operator to take actions within a 28-hour timeframe to prevent wet R-114 from leaking into the process gas system. The DP alarms had been nonfunctional for more than 28 hours when discovered. Both DP alarms were put back in service and the R-114 sampled and found dry within 4 hours of discovery, therefore, re-establishing double contingency. | | event text = At 1430, on 04-04-04 the Plant Shift Superintendent was notified of a violation of Nuclear Criticality Safety (NCS) control in the C-333 process building. While preparing for start up of the C-333 #1 High Speed Purge and Evacuation (P & E) pump, operations discovered that the delta pressure (DP) alarm instrument line to the RCW supply was unattached and the isolation valve was closed. With the RCW instrument line not attached, both DP alarms for this pump were not functional and therefore not able to perform their safety function, violating a safety related item (SRI) in NCSE 039. The SRI requires that both DP alarms be functional while the P & E is isolated from the cascade. The purpose of the SRI Is to alert the operator to take actions within a 28-hour timeframe to prevent wet R-114 from leaking into the process gas system. The DP alarms had been nonfunctional for more than 28 hours when discovered. Both DP alarms were put back in service and the R-114 sampled and found dry within 4 hours of discovery, therefore, re-establishing double contingency. | ||
The Senior NRC Resident Inspector has been notified of this event. | The Senior NRC Resident Inspector has been notified of this event. | ||
Latest revision as of 19:41, 24 November 2018
| Where | |
|---|---|
| Paducah Gaseous Diffusion Plant Paducah, Kentucky (NRC Region 2) | |
| License number: | GDP-1 |
| Reporting | |
| Response | |
| Time - Person (Reporting Time:+6.17 h0.257 days <br />0.0367 weeks <br />0.00845 months <br />) | |
| Opened: | Kevin Beasley 01:40 Apr 5, 2004 |
| NRC Officer: | Mike Ripley |
| Last Updated: | Apr 29, 2004 |
| 40641 - NRC Website | |