ENS 44773: Difference between revisions
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| event date = 01/14/2009 11:30 CST | | event date = 01/14/2009 11:30 CST | ||
| last update date = 01/14/2009 | | last update date = 01/14/2009 | ||
| title = Manual Actions | | title = Manual Actions for Fire Not in Compliance | ||
| event text = During review of the 10 CFR 50 Appendix R safe shutdown compliance assessment, it was discovered that a fire in either fire area 31 or 32, the Aux Feedwater Pump and Instrument Air Compressor Room, could cause the loss of the instrument air system which is credited to supply compressed air for the control room chillers. The effect of the loss of compressed air supply to the control room chillers was not fully analyzed in the Appendix R compliance assessment. | | event text = During review of the 10 CFR 50 Appendix R safe shutdown compliance assessment, it was discovered that a fire in either fire area 31 or 32, the Aux Feedwater Pump and Instrument Air Compressor Room, could cause the loss of the instrument air system which is credited to supply compressed air for the control room chillers. The effect of the loss of compressed air supply to the control room chillers was not fully analyzed in the Appendix R compliance assessment. | ||
The chillers have compressed air cylinders to provide at least an 8 hour backup supply of compressed air and operators routinely validate that there is at least a 12 hour supply of compressed air and have a procedure to replace the compressed air cylinders if needed. The control room chillers are required to cool the control room to achieve and maintain hot shutdown and per the guidance in RIS 2006-10, 'Regulatory Expectations with Appendix R Paragraph III.G.2 Operator Manual Actions,' operator manual actions to replace compressed air cylinders for the loss of the instrument air compressors are not in compliance with 10 CFR 50 Appendix R. | The chillers have compressed air cylinders to provide at least an 8 hour backup supply of compressed air and operators routinely validate that there is at least a 12 hour supply of compressed air and have a procedure to replace the compressed air cylinders if needed. The control room chillers are required to cool the control room to achieve and maintain hot shutdown and per the guidance in RIS 2006-10, 'Regulatory Expectations with Appendix R Paragraph III.G.2 Operator Manual Actions,' operator manual actions to replace compressed air cylinders for the loss of the instrument air compressors are not in compliance with 10 CFR 50 Appendix R. | ||
Latest revision as of 21:12, 1 March 2018
| Where | |
|---|---|
Prairie Island  Minnesota (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-2.22 h-0.0925 days <br />-0.0132 weeks <br />-0.00304 months <br />) | |
| Opened: | Bob Carlson 15:17 Jan 14, 2009 |
| NRC Officer: | Pete Snyder |
| Last Updated: | Jan 14, 2009 |
| 44773 - NRC Website
| |