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Radiation protection in Ignalina NPP and outside organizations |
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Workers of other organizations also perform operations in the controlled area of Ignalina NPP. According to legal requirements the same radiation protection means shall be used to protect them as the ones for Ignalina NPP workers.
According to Lithuania Hygienic Standard HN 83:2004 “Radiation protection and safety of outside workers” the outside worker – a person sent by the employer to other licensee to perform activity with sources of ionising radiation and subject to exposure, the doses of which may exceed the limits established to the population.
In 2009 2153 workers of Ignalina NPP and 1173 outside workers were monitored for exposure. Approximately 89.4% of their doses were below 0.5 mSv. The maximum one was 11.59 mSv received by a worker of Ignalina NPP Reactor Department.
Variations of collective doses of Ignalina NPP and outside workers in 1999 to 2009 normalized to one unit are shown in Fig. 1
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Fig. 1. Variations of collective doses of Ignalina NPP and outside workers in 1999 to 2009 normalized to one unit
The annual collective dose of Ignalina NPP workers was 963.9 man mSv, of outside workers – 69.5 man mSv. It should be noted that in 2009 the total collective dose of Ignalina NPP and outside workers was approximately 3 times lower than in 2008.
The decrease trend of Ignalina NPP outside workers collective doses is being monitored since 1998. The key reason having determined such occupational exposure change was the reduced scope of works of the planned outage of the 2nd unit due to the planned unit decommissioning at the end of 2009. Therefore the collective dose received during outage reached as low as 25% of the total annual collective worker dose, though in the previous year this indicator reached approximately 60-70%. These changes are best reflected in exposure of outside workers which reduced approximately 15 times compared to 2008.
The risk of internal exposure (radionuclide activity in the body) of workers is increasing during maintenance works. Therefore internal exposures are annually monitored. In 2009 the dose exceeding the minimum detectable activity was reported by Ignalina NPP for 188 workers out of 1910 monitored ones. The highest internal exposure dose (0.28 mSv) was reported for a worker of Ignalina NPP Reactor Department representing 1.4% of permissible annual dose limit. The results of internal exposure monitoring of Ignalina NPP and outside workers are presented in Fig. 2.
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Fig. 2. Results of internal exposure monitoring of Ignalina NPP and outside workers, 2009
Last update 2010-07-27 |
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Our location |
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Kalvarijų 153,
LT-08221, Vilnius
ph. +370 5 236 19 36
fax +370 5 276 36 33
rsc@rsc.lt
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Vadovaujantis Radiacinės saugos centro direktoriaus 2008 m. sausio 31 d. įsakymu Nr. 5 „Dėl Asmenų aptarnavimo ir jų prašymų, skundų ir pranešimų nagrinėjimo Radiacinės saugos centre taisyklių patvirtinimo“, asmenys Radiacinės saugos centre aptarnaujami pirmadieniais ir trečiadieniais 8.00 – 17.00 val., antradieniais ir ketvirtadieniais 8.00 – 18.00 val., penktadieniais 8.00 – 15.45 val. (pietų pertrauka 12.00 – 12.45 val.) Vilniuje, Kalvarijų g. 153, 103 kabinete, tel. (8 5) 236 1936, faks. (8 5) 276 3633, el. paštas rsc@rsc.lt.
The web site was updated under the auspices of Swedish Radiation Safety Institution (now SSM) |
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