BOHUNICE V- 2 NUCLEAR POWER PLANT
Bohunice V-2 Nuclear Power Plant consists of two units with WWER 440 type reactors of improved V-213 type, which were put into operation in 1984 and 1985. Both units operated in 2001 according to the needs of the energy dispatch centre in based load, or also in the regime of “tertiary regulation” and “primary regulation” respectively. From both unit of Bohunice V-2 NPP also the non-electric production heat was used by steam bleeding from the turbine which served as a heat source for heating Trnava, Hlohovec and Leopoldov towns. In 2001 the planned refuelling outage was performed at both units.
The ongoing review and assessment of the document “Concept of modernisation and safety improvement of Bohunice V-2 NPP”, submitted by the operator based on UJD decision was a significant activity of UJD in connection with safety assessment of Bohunice V-2 NPP in 2001. UJD made an assessment and elaborated comments to the whole conception as well as to the individual topical tasks of safety improvement and by its decision determined the requirements for preparation of tasks implementation according to fixed schedule.
Consequently the top
management of the Slovak Republic power utility SE, a.s. definitely approved the
modernisation programme for Bohunice V-2 NPP.
During the refuelling
outages in 2002 on unit 1 and unit 2 of Bohunice V-2 NPP the profile fuel with an average
enrichment of 3,82 % was loaded into reactor core. Based on this the changes and
supplements to corresponding chapters of Safety Analysis Report (SAR) were accomplished.
Loading of new fuel was conducted according to licensing procedure contained in the
corresponding UJD safety guide. During the planned outages on unit 1 and unit 2 of
Bohunice V-2 NPP in 2001 the assessment activities of UJD were focused on reviewing and
assessment of the design modifications of systems important to safety which were submitted
to the UJD by the utility with the aim of safety and reliability improvement of operating
units. In 2001 the programme of systematic improvement of tightness of the containment was
realised on unit 1 and unit 2. By realisation of this programme further increase of
confinement tightness was reached and the leakage from containment reached the values 5,97
% and 9,34 % for unit 1 and 2 respectively. These values are better as those reached in
2000 and significantly better than it is required by limits and conditions of safety
operation of Bohunice V-2 NPP.
Statistical overview of number of operational events at Bohunice V-2 NPP between 1993 and 2001 and their ranking according to the INES scale as well as an overview of collective dose of personnel are given in the tables 3.4 up to 3.6. In the tables only those events are recorded which according to the corresponding regulation have to be reported to UJD.
Inspection activity at Bohunice V-2 NPP
Inspection activities at Bohunice V-2 NPP were conducted mainly through routine inspections. Further there were 18 special inspections and 2 team inspections focused on different fields in compliance with the inspection plan of UJD. Inspections were focused mainly on:
Based on the evaluation of results of assessment and inspection activities and assessment of safety indicators UJD evaluated the operation of both units of Bohunice V-2 NPP in 2001 as safety and reliable.