ENS 43706
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ENS Event | |
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17:12 Oct 10, 2007 | |
Title | Pressurizer Porv Opened Momentarily with Rcs Discharge of Approximately 10 Gallons |
Event Description | On 10/10/2007 at 1312, Crystal River Unit 3 was performing maintenance on its Pressurizer Pilot Operated Relief Valve (PORV). The I&C technicians were replacing a circuit board card in the circuitry for the PORV. The PORV had been selected to close during the replacement of the card. When the PORV was selected to its auto position, the PORV opened and was immediately closed by the reactor operator. It was estimated that the PORV was opened for 2 second with a total flow of 10 gallons. This rate is in excess of the 25 gpm as found in the EAL. The event was quickly terminated with the closing of the PORV and PORV block valve. The plant remains stable with the PORV and PORV block valve closed. CR3 briefly met the conditions of an Unusual Event, however declaration was not required.
The licensee is still trouble-shooting the cause of the event. The reactor is stable at full power and the technical specification action statement requirement for an inoperable PORV valve (TS 3.4.10) have been satisfied. The licensee reported this event for information based on the guidance of NUREG 1022 concerning reporting an event that was rapidly terminated that may have met the criteria of an emergency based on an after the fact review. The licensee notified the State and local authorities and the NRC Resident Inspector. |
Where | |
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Crystal River Florida (NRC Region 2) | |
Reporting | |
Information Only Other Unspec Reqmnt 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | |
Time - Person (Reporting Time:+-3.05 h-0.127 days <br />-0.0182 weeks <br />-0.00418 months <br />) | |
Opened: | Rick Rawls 14:09 Oct 10, 2007 |
NRC Officer: | Bill Huffman |
Last Updated: | Oct 10, 2007 |
43706 - NRC Website
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Unit 3 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Crystal River with Information Only, Other Unspec Reqmnt, 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | |
WEEKMONTHYEARENS 529572017-09-09T15:09:0009 September 2017 15:09:00
[Table view]Other Unspec Reqmnt Hurricane Warning Issued Affecting Site within 36 Hours ENS 487162013-02-05T13:00:0005 February 2013 13:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Media/Press Release ENS 481732012-08-09T22:00:0009 August 2012 22:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Non Work Related On-Site Fatality ENS 467222011-04-04T04:00:0004 April 2011 04:00:00 Other Unspec Reqmnt Press Release Concerning Additional Containment Delamination ENS 466732011-03-14T18:11:00014 March 2011 18:11:00 Other Unspec Reqmnt Additional Delaminated Containment Concrete Discovered ENS 464372010-11-24T20:50:00024 November 2010 20:50:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Release of an Oily Mixture to Discharge Canal ENS 454162009-10-07T23:30:0007 October 2009 23:30:00 Other Unspec Reqmnt Discovery of a Containment Separation ENS 453502009-09-14T20:15:00014 September 2009 20:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Fish Kill Reported to the Florida Fish and Wildlife Conservation Commission ENS 437062007-10-10T17:12:00010 October 2007 17:12:00 Information Only, Other Unspec Reqmnt, 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Pressurizer Porv Opened Momentarily with Rcs Discharge of Approximately 10 Gallons ENS 414402005-02-24T20:30:00024 February 2005 20:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Related to Heart Attack Fatality ENS 404152003-12-28T13:49:00028 December 2003 13:49:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Fish Kill at Crystal River Reported to Florida Fish and Wildlife Conservation Commission 2017-09-09T15:09:00 | |
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