1 / 11

Aftermath of the INES-3 Incident at Paks NPP on 10th April, 2003.

Aftermath of the INES-3 Incident at Paks NPP on 10th April, 2003. Lajos Vöröss Hungarian Atomic Energy Authority 7th Annual Meeting of NERS IAEA, Vienna, 23-24, September 2004. Main Tasks to Perform.

tobias
Download Presentation

Aftermath of the INES-3 Incident at Paks NPP on 10th April, 2003.

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Aftermath of the INES-3 Incident at Paks NPPon 10th April, 2003. Lajos Vöröss Hungarian Atomic Energy Authority 7th Annual Meeting of NERS IAEA, Vienna, 23-24, September 2004.

  2. Main Tasks to Perform After having stabilised the situation inside the reactor hall there have been two main tasks to perform: 1. Recovery of service shaft No.1 of Unit 2. (SS) where the incident occurred 2. Restart of Unit 2. as soon as possible

  3. Recovery of SS - Recovery project and team established at Paks NPP - Tendering process won by Russian consortium led by TVEL; FRAMATOM had bidden as well - 6-8 months preparatory, 2-3 months implement phases planned, excluded licensing time - significant delay now - Special tools for manual removal of debris are to be used - Manipulation is to be carried out from a movable platform placed above the cleaning tank - Some experiments to clarify behaviour of debris for planned removal actions performed

  4. Recovery outline – FRA/GER crane control panel • 2 versions • removal of the cleaning tank and fuel in one step (dismissed later – difficult, doesnot give final solution) • removal of the cleaning tank and fuel in partswith clips, bending tools, manipulators, vacuum soakers, cutters air filter suction working rod manipulator container cleaning tank

  5. winner Recovery outline – RUS mostly manual removal shell different - water level, - boron concent- ration, - contami- nation НПФСосны moving platform ГИ ВНИПИЭТ ГП НИКИМТ structure ПО Маяк container

  6. Recovery of SS (cont’d) - Separation of SS from spent fuel pond and from other systems of Unit 2.became necessary - Autonomous cooling device and emergency boron injection system for SS have been installed - Mobile water cleaning device (NURES,Finland) was used to clean the water especially from the uranium and trans-uranium isotopes

  7. Recovery of SS (cont’d) - Reliable neutron flux and boron concentration measurement in SS installed - Increased radwaste storage capacity constructed - Free positions made available for capsules/cartridges containing debris in spent fuel pool - Preparatory actions for regulatory licensing process - regulatory requirements for recovery developed - review and assessment in large number of modifications and fabrication of equipment performed

  8. Restart of Unit 2. - After long-term shut-down status with intact main equipment but contaminated by uranium and trans-uranium isotopes - special cleaning was necessary (completed) - Interrupted refuelling and maintenance occurred during the incident - RPV used as temporary storage tank of spent fuel assemblies - Low enrichment fresh FE supply and rearrangement of spent fuel pool became necessary - Reuse of cleaned spent fuel assemblies is limited

  9. Restart of Unit 2. (cont’d) - Conception for short term operation cycle developed - refuelling and yearly maintenance completed - suitable core for operation during the preparatory phase of the recovery is possible (about 4 months long) - regulatory requirements for restart/operation phases developed, licence given on 16. July, 2004. - nearly full power operation started on 02 Sept. 2004. - Keen interest from media and public follows

  10. International Assistance - IAEA - two international missions provided at Paks NPP - GAN (Russian Regulator) - on basis of contractual arrangement, focuses to review QA of Russian contractors - US NRC/IAEA - gives advice to review conditions of restart of Unit 2. NOTE: In spite of the incident, lifetime extension and power uprating of the units are still insisted on

More Related