ENS 49043
ENS Event | |
|---|---|
23:34 May 15, 2013 | |
| Title | Primary Containment Airlock Non-Functional Due to Degraded Seal on Inner Door Concurrent with Personnel Passing Through the Outer Door |
| Event Description | At approximately 1934 EDT on May 15, 2013, maintenance personnel entered the primary containment personnel air lock to determine the cause of the inability to attain test pressure during a type B leak rate of the airlock. The inner door seal was found degraded and partially rolled from its required position allowing air from inside the airlock to enter the primary containment. During the limited time the outer airlock door was opened for access into the airlock concurrent with the degraded seal on the inner door, a condition existed that could have prevented the fulfillment of the safety function of the structure to control the release of radioactive material.
The inner door seal was subsequently replaced and the leak rate of the personnel air lock completed with satisfactory results. During the seal replacement activity, the outer airlock door remained closed to provide the barrier against the release of radioactive material should it be required. This is a notification per 10 CFR 50.72(b)(3)(v) for a condition that could have prevented the control of the release of radioactive material. It is recognized that this notification [was] not within eight hours of the event. The condition has been entered into the station's corrective action program. The licensee will notify the New York State Public Service Commission and the NRC Resident Inspector.
This notification is being made to retract Event Notification #49043, which reported a condition that could have prevented the control of the release of radioactive material when the primary containment airlock inner door seal was found degraded concurrent with the outer door being open. Further analysis by engineering of the actual conditions which were recorded when the airlock Type B leak rate test was being performed and calibration checks of the leak rate monitor instrumentation used for the test, has determined that the leakage through the degraded inner airlock door seal, when combined with the Appendix J As-Left Minimum Pathway Type B and C leak rates, remains below the Technical Specification Primary Containment As-Left Minimum Pathway Leakage Limit of 0.6 La. Therefore, for the period in which the inner airlock door seal was degraded and the outer airlock door was open, the primary containment function to control the release of radioactive material was maintained and the initial notification per 10 CFR 50.72(b)(3)(v) is being retracted. The licensee has notified the NRC Resident Inspector and the New York State Public Service Commission. R1DO (Ferdas) notified. |
| Where | |
|---|---|
Nine Mile Point  New York (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
| Time - Person (Reporting Time:+17.2 h0.717 days <br />0.102 weeks <br />0.0236 months <br />) | |
| Opened: | Jerry Helker 16:46 May 16, 2013 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Jun 27, 2013 |
| 49043 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (23 %) |
| After | Power Operation (23 %) |
Nine Mile Point with 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
WEEKMONTHYEARENS 529962017-09-30T05:34:00030 September 2017 05:34:00
[Table view]10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Declared Inoperable ENS 519692016-06-01T14:46:0001 June 2016 14:46:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Nine Mile Point Unit 1 Momentary Loss of Secondary Containment ENS 518562016-04-07T21:30:0007 April 2016 21:30:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Both Doors of Secondary Containment Open Simultaneously ENS 512892015-08-05T16:52:0005 August 2015 16:52:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Momentary Loss of Secondary Containment ENS 508602015-03-03T13:37:0003 March 2015 13:37:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Momentary Loss of Secondary Containment Due to Both Airlocks Opening at Same Time ENS 508132015-02-12T00:41:00012 February 2015 00:41:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Nine Mile Point Momentary Loss of Secondary Containment ENS 507322015-01-13T00:39:00013 January 2015 00:39:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Degraded Secondary Containment Differential Pressure ENS 505532014-10-20T17:53:00020 October 2014 17:53:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Both Secondary Containment Airlock Doors Open Simultaneously ENS 505422014-10-16T14:42:00016 October 2014 14:42:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Momentary Loss of Secondary Containment ENS 503632014-08-14T03:18:00014 August 2014 03:18:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Momentary Loss of Secondary Containment ENS 501872014-06-11T00:32:00011 June 2014 00:32:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Declared Inoperable ENS 499852014-04-02T05:23:0002 April 2014 05:23:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Inoperable Due to Two Air Lock Doors Open Simultaneously ENS 499482014-03-24T04:31:00024 March 2014 04:31:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Inoperable and Unplanned Isolation of the Reactor Building Vent Radiation Monitor ENS 499062014-03-12T18:22:00012 March 2014 18:22:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Inoperable and Unplanned Isolation of Building Vent Radiation Monitor ENS 490432013-05-15T23:34:00015 May 2013 23:34:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Primary Containment Airlock Non-Functional Due to Degraded Seal on Inner Door Concurrent with Personnel Passing Through the Outer Door ENS 473682011-10-24T05:52:00024 October 2011 05:52:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Both Divisions of the Rwcu High Differential Flow Isolation Function Removed from Service 2017-09-30T05:34:00 | |