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This newsletter provides feedback on Operating Experience (OE) from significant safety related events at nuclear power plants (NPPs) worldwide, every three months.
This Quarterly Report compiles the NPP events that were reported publicly during the period from 1st April 2015 to 30th June 2015.
 
5 events were selected from the short-list for this Newsletter, these are:

  1. 17/10/2014: Delayed identification of steam generator tube leakage. (Republic of Korea – HANBIT 3)
  2. 28/01/2015: Reactor Protection and DC Electrical System Inoperability Due to Inadvertent Parallel Connection of Safety Trains. (US – H.B. ROBINSON 2)
  3. 26/02/2015: Automatic Reactor Trip Due to Low-Low Level on "B" Steam Generator. (US – NORTH ANNA 1)
  4. 03/03/2015: Byron Unit 1 Reactor Trip Resulting from a Phase to Phase Fault on the 1E Main Power Transformer. (US – BYRON 1)
  5. 28/05/2015: Steam Generator safety relief valve stuck open. (France – CATTENOM 1)

Please see the attachments for more details.
 
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The Topical Study on Cooling Chain has been published. You can find it in the document section of the website

This newsletter provides feedback on Operating Experience (OE) from significant safety related events at nuclear power plants (NPPs) worldwide, every three months.
This Quarterly Report compiles the NPP events that were reported publicly during the period from 1st January 2015 to 31st March 2015.
5 events were selected from the short-list for this Newsletter, these are:

  1. 22/10/2014: Emergency diesel generators rendered inoperable by potential water intrusion into diesel fuel oil feed tanks.. (US – WATERFORD 3)
  2. 01/11/2014: Manual reactor trip due to lake debris intrusion causing degraded forebay conditions. (US – DONALD COOK 1 & 2)
  3. 25/11/2014: Deficiency in loss of coolant accident analysis adversely affected predicted peak cladding temperature. (US – ARKANSAS ONE 1, DAVIS BESSE 1, OCONEE 1, 2 & 3)
  4. 28/12/2014: Two emergency diesels inoperable due to human error. (US - MONTICELLO)
  5. 03/01/2015: Shutdown delay exceeding the technical specifications requirement. (France – CRUAS 4)

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The TOER planning has been updated. The new version is available under the documents section of the website.

Please note that the time period available for commnets on the Cooling Chain topical report has been extended from April 15th to May 15th.

The Topical Study on Organisational and Management-related Aspects in Nuclear Power Plants has been published.

You can find it in the document section of the website

From now on, an excel spreadsheet containing the current status and planned activities related to the topical studies under development, or planned, by the Clearinghouse staff, is available in the documents section. It will be regularly updated

The first draft has been released for review by the Clearinghouse members. It can be found in the restricted area, section "documents".

The document is available to all registered users, via the link: https://clearinghouse-oef.jrc.ec.europa.eu/documents/list/55826
 
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The draft note has been released for review by Clearinghouse members. It can be reached in the section "technical notes" or via the link: https://clearinghouse-oef.jrc.ec.europa.eu/documents/list/55823 (restricted area).

This newsletter provides feedback on Operating Experience (OE) from significant safety related events at nuclear power plants (NPPs) worldwide, every three months.
This Quarterly Report compiles the NPP events that were reported publicly during the period from 1st October 2014 to 31st December 2014.
4 events were selected from the short-list for this Newsletter, these are:

  1. 05/08/2014: Reactor scram due to main steam isolation valve stem-disk separation. (US – LASALLE 2)
  2. 14/09/2014: Failed fuel assembly. (US – NORTH ANNA 2)
  3. 06/11/2014: Unit shut down due to a service water train unavailability. (Czech Republic – DUKOVANY 3 & 4)
  4. 17/12/14: Risk of unavailability of emergency turbine driven generator. (France - all)

Regarding the event reported on the "Quarterly Report on NPP events July- September 2012":

The Belgian Safety Authority, FANC, has recently published the "Flaw indications in the reactor pressure vessels of Doel 3 and Tihange 2 Progress report 2014". It is now publicly available on the Internet: http://www.fanc.fgov.be/GED/00000000/3700/3751.pdf.
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The first draft has been released for review by the Clearinghouse members. It can be found in the restricted area, section "documents".

The DRAFT study is available for review by the Clearinghouse members. The study can be found in section "Documents" (restricted area).

The final version of the topical study on cracks and leaks of the reactor coolant pressure boundary has been published (in restricted area).

This newsletter provides feedback on Operating Experience (OE) from significant safety related events at nuclear power plants (NPPs) worldwide, every three months.
This Quarterly Report compiles the NPP events that were reported publicly during the period from 1st July 2014 to 30th September 2014.
3 events were selected from the short-list for this Newsletter, these are:

  1. 25/05/2014: Dual unit reactor trip on loss of offsite power. (US – Millstone 2 & 3)
  2. 05/08/2014: Automatic shut down as result of an oil leak on the steam turbine. (Belgium – Doel 4)
  3. 18/08/2014: Radiation exposure of one worker exceeding one fourth of the annual limit. (France – Tricastin 1)

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This newsletter provides feedback on Operating Experience (OE) from significant safety related events at nuclear power plants (NPPs) worldwide, every three months.
This Quarterly Report compiles the NPP events that were reported publicly during the period from 1st April 2014 to 30th June 2014.
4 events were selected from the short-list for this Newsletter, these are:

  1. 15/05/2014: Risk of biological protections falls on safety equipment. (France – 42 reactors)

Among these 4 events, 3 are related to water intrusion:

  1. 09/01/2014: Internal RAB flooding during heavy rain due to degraded conduits lacking internal flood barriers. (US – St. Lucie 1)
  2. 21/01/2014: Reactor trips due to inadequate protection against weather related water intrusion and turbine control system reboot. (US – Calvert Cliffs 1 & 2)
  3. 17/04/2014: Internal flooding in non-nuclear buildings. (France – Fessenheim 1)

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This technical note may be found here.
 

The Summary Report on events related to digital I&C and on events related to Decommissioning are now available:

 
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This newsletter provides feedback on Operating Experience (OE) from significant safety related events at nuclear power plants (NPPs) worldwide, every three months.
This Quarterly Report compiles the NPP events that were reported publicly during the period from 1st January 2014 to 31st March 2014.
5 events were selected from the short-list for this Newsletter, these are:

  1. 17/04/2013: Unusual event declared due to loss of offsite power and dual unit reactor scram. (US – Lasalle 1)
  2. 24/08/2013: Detection of fuel defects. (Germany – Brokdorf KBR)
  3. 09/12/2013: Fire and explosion of the unit auxiliary transformer resulted in an automatic reactor scram and initiation of the emergency feedwater system. (US – Arkansas One 2)
  4. 27/12/2013: Malfunction of diesel generator. (Finland – Loviisa 1 & 2)
  5. 14/02/2014: Automatic trip and safety injection. (France – Blayais 4)

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A new update has been prepared about the situation at Fukushima NPP. It gives an overview of the situation on March 10th, 2014 and can be found in the "Fukushima" folder.
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This newsletter provides feedback on Operating Experience (OE) from significant safety related events at nuclear power plants (NPPs) worldwide, every three months.
This Quarterly Report compiles the NPP events that were reported publicly during the period from 1st October 2013 to 31st December 2013.
4 events were selected from the short-list for this Newsletter, these are:

  1. 03/05/2013: HPSI pump flow imbalance. (US – Fort Calhoun 1)
  2. 15/09/2013: Unit 2 RHR pump room flooding. (US – Susquehanna 2)
  3. 17/09/2013: Non-compliance with required seismic behaviour of 4 safety electrical panels. (France – Civaux 1 & 2)
  4. 08/10/2013: Discovery of damaged fuel rods during core unloading and fuel inspections. (Slovenia – Krsko)

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