ENS 46206
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ENS Event | |
|---|---|
12:30 Aug 25, 2010 | |
| Title | Offsite Notification - Release of Hydrogen Gas in Excess of the Reportable Quantity of Ten Pounds |
| Event Description | On August 25, 2010 [the licensee] made a notification to] the Massachusetts Department of Environmental Protection and the Plymouth Massachusetts Fire Department in accordance with 310CMR40.300, Massachusetts Contingency Plan Notification of Oil and Hazardous Material; Identification and Listing of Oil and Hazardous Material. [The licensee made the notification] due to a release of hydrogen gas to the environment exceeding the reportable quantity of ten pounds via the designed system release path. The release occurred when restoration of a system vacuum pump following planned maintenance resulted in higher than normal system makeup rates. Combustible gas sampling of equipment areas confirmed that the excess hydrogen gas had been released to the environment via a remote roof vent designed to continuously exhaust [hydrogen] removed from the seal oil system by the vacuum pump. The release of hydrogen gas was secured when the vacuum pump was removed from service. The estimated quantity of hydrogen gas released was approximately twenty pounds. This event posed no danger to the health and safety of plant personnel or members of the general public.
The NRC Senior Resident Inspector is on-site and has been notified. The licensee is investigating the cause of the excessive makeup rate. |
| Where | |
|---|---|
| Pilgrim Massachusetts (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | |
| Time - Person (Reporting Time:+-1.87 h-0.0779 days <br />-0.0111 weeks <br />-0.00256 months <br />) | |
| Opened: | Stan Paul 10:38 Aug 25, 2010 |
| NRC Officer: | Pete Snyder |
| Last Updated: | Aug 25, 2010 |
| 46206 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Pilgrim with 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | |
WEEKMONTHYEARENS 558442022-04-15T14:00:00015 April 2022 14:00:00
[Table view]10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Notification of Environmental Report to Another Government Agency ENS 555672021-11-09T15:40:0009 November 2021 15:40:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Violation of Discharge Permit ENS 552022021-04-21T11:52:00021 April 2021 11:52:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to the Commonwealth of Massachusetts ENS 550712021-01-18T21:00:00018 January 2021 21:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Leak from Underground Sewage Storage Tank ENS 524492016-12-20T23:30:00020 December 2016 23:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Release of Hydrogen Gas in Excess of the Reportable Quantity of Ten Pounds ENS 522312016-09-09T21:39:0009 September 2016 21:39:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Release of Hydrogen Gas in Excess of the Reportable Quantity of Ten Pounds ENS 507692015-01-27T09:02:00027 January 2015 09:02:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Scram on Turbine Trip Due to Loss of Offsite Power ENS 501342014-05-23T16:10:00023 May 2014 16:10:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Release of Hydrogen Gas in Excess of Reportable Quantity ENS 490532013-05-20T07:53:00020 May 2013 07:53:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Off-Site Notification Due to Fire in Turbine Building ENS 489092013-04-10T17:14:00010 April 2013 17:14:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Massachusetts Agencies Notified Regarding Neutralizing Sump Discharge Line Inspection ENS 487392013-02-10T19:05:00010 February 2013 19:05:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Loss of Offsite Power and Subsequent Press Release ENS 486692013-01-12T14:50:00012 January 2013 14:50:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Potential Security Event ENS 486652013-01-11T11:55:00011 January 2013 11:55:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Regarding Manual Reactor Scram ENS 484392012-10-24T23:20:00024 October 2012 23:20:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Press Release Regarding Status of Ongoing Labor Negotiations ENS 480782012-07-08T20:27:0008 July 2012 20:27:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Commonwealth of Massachusetts Notified That Pilgrim Station Workers Ratify New Contract ENS 480592012-06-29T21:46:00029 June 2012 21:46:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to an Employee Medical Emergency ENS 479972012-06-06T04:45:0006 June 2012 04:45:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Regarding Labor Negotiations ENS 479682012-05-26T06:00:00026 May 2012 06:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Press Release Regarding Status of Ongoing Labor Negotiations ENS 479272012-05-17T01:00:00017 May 2012 01:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Press Release Regarding Status of Ongoing Labor Negotiations ENS 471992011-08-26T17:45:00026 August 2011 17:45:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Press Release Related to Hurricane Preparations at the Pilgrim Site ENS 462062010-08-25T12:30:00025 August 2010 12:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Release of Hydrogen Gas in Excess of the Reportable Quantity of Ten Pounds ENS 460832010-07-09T04:00:0009 July 2010 04:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Elevated Levels of Tritium Found in a Well Sample ENS 449982009-04-18T05:20:00018 April 2009 05:20:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Courtesy Notification Made to State of Massachusetts Involving an Employee Fatality ENS 442172008-05-16T00:00:00016 May 2008 00:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to State of Massachusetts Regarding Press Release ENS 436422007-09-14T14:50:00014 September 2007 14:50:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to Epa Required by Npdes Permit ENS 427502006-08-02T09:45:0002 August 2006 09:45:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Motor Vehicle Fatality of Plant Employee 2022-04-15T14:00:00 | |
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