ENS 48134: Difference between revisions
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| event date = 07/25/2012 16:02 CDT | | event date = 07/25/2012 16:02 CDT | ||
| last update date = 09/19/2012 | | last update date = 09/19/2012 | ||
| title = Identification | | title = Identification of a Degraded or Unanalyzed Condition | ||
| event text = At 1602 [CDT], Engineering personnel notified the control room that during review of a pipe stress calculation it was identified that non-conservative or incorrect methodologies were used in the calculation. This calculation was for a modification to install four; 3 [inch] drain lines between the Essential Service Water (ESW) (safety) and the Service Water (SW) (non-safety) in 1991. A preliminary ME101 stress analysis performed, which corrects the above-identified discrepancies, indicates that the pipe stresses at the drain line weldolet connection exceed the ASME code of record allowable stresses by approximately 50%, when the revised Stress Intensification Factor (SIF) is applied. This modification affected both trains (A & B) ESW trains. | | event text = At 1602 [CDT], Engineering personnel notified the control room that during review of a pipe stress calculation it was identified that non-conservative or incorrect methodologies were used in the calculation. This calculation was for a modification to install four; 3 [inch] drain lines between the Essential Service Water (ESW) (safety) and the Service Water (SW) (non-safety) in 1991. A preliminary ME101 stress analysis performed, which corrects the above-identified discrepancies, indicates that the pipe stresses at the drain line weldolet connection exceed the ASME code of record allowable stresses by approximately 50%, when the revised Stress Intensification Factor (SIF) is applied. This modification affected both trains (A & B) ESW trains. | ||
The normal system alignment uses the SW water to supply the ESW, then during accident conditions the SW and ESW systems isolate from each other so that two redundant separate train isolation valves isolate the ESW system. These 3 [inch] drain lines are located in the section of piping that is isolated from the ESW and SW systems. | The normal system alignment uses the SW water to supply the ESW, then during accident conditions the SW and ESW systems isolate from each other so that two redundant separate train isolation valves isolate the ESW system. These 3 [inch] drain lines are located in the section of piping that is isolated from the ESW and SW systems. | ||
Latest revision as of 22:03, 1 March 2018
| Where | |
|---|---|
Wolf Creek  Kansas (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+1.2 h0.05 days <br />0.00714 weeks <br />0.00164 months <br />) | |
| Opened: | Mark Jenkins 22:14 Jul 25, 2012 |
| NRC Officer: | Vince Klco |
| Last Updated: | Sep 19, 2012 |
| 48134 - NRC Website
| |