ENS Event | |
|---|---|
12:20 Aug 20, 2014 | |
| Title | an Isolation Valve Did Not Close During a Maintenance Evolution |
| Event Description | On 8/20/2014, 0820 hrs [EDT], the Plant Shift Superintendent was notified of the following condition:
During a maintenance evolution to change the machine drive unit (MDU) software, one of the four primary isolation valves comprising the machine isolation valve (MIV) set did not close as required. Specifically, the purge vacuum (PV) isolation valve did not close. All other isolation valves did close as required. This event is being reported as a loss or degradation of an IROFS [Item Relied on for Safety] that results in a failure to meet the performance requirements of Section 70.61 [and is reportable per 70.50(b)(2)]. The licensee will notify the NRC Resident Inspector.
On 09/08/2014, the Plant Shift Superintendent, with concurrence of USEC-ACP RO [Regulatory Oversight] determined that this event can be retracted. Engineering Evaluation, EE-2101-0053 Rev. 0, establishes the basis for retracting Event Number 50384. The retraction is based upon an analysis showing that failure of the purge vacuum (PV) isolation valve in the machine isolation valve (MIV) IROFS does not create a condition that results in a failure to meet the performance requirements of 10 CFR 70.61. The licensee will notify the NRC Resident Inspector. Notified R2DO (Seymour) and NMSS EO (Habighorst). |
| Where | |
|---|---|
| Portsmouth American Centrifuge Piketon, Ohio (NRC Region 2) | |
| License number: | SNM-2011 |
| Reporting | |
| 10 CFR 70.50(b)(2) | |
| Time - Person (Reporting Time:+6.02 h0.251 days <br />0.0358 weeks <br />0.00825 months <br />) | |
| Opened: | Eric Spaeth 18:21 Aug 20, 2014 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Sep 8, 2014 |
| 50384 - NRC Website | |
Portsmouth American Centrifuge with 10 CFR 70.50(b)(2) | |
WEEKMONTHYEARENS 503842014-08-20T12:20:00020 August 2014 12:20:00
[Table view]10 CFR 70.50(b)(2) an Isolation Valve Did Not Close During a Maintenance Evolution 2014-08-20T12:20:00 | |