Aftermath of the ines 3 incident at paks npp on 10th april 2003
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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.

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

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Aftermath of the ines 3 incident at paks npp on 10th april 2003

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.


Main tasks to perform

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


Recovery of ss

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


Aftermath of the ines 3 incident at paks npp on 10th april 2003

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


Aftermath of the ines 3 incident at paks npp on 10th april 2003

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


Recovery of ss cont d

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


Recovery of ss cont d1

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


Restart of unit 2

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


Restart of unit 2 cont d

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


International assistance

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


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