Page 91 - AERB Annual Report 2020

The effective doses to the members of the public (Year 2016 to 2020) due to the release of radioactive
efuents from the plants are presented in the Figures 4.1 (a) and 4.1 (b).

45

40
35
Effective dose (µSv) 30

25

20
15

10
5
0
Tarapur Rawatbhata Kalpakkam Narora Kakrapara Kudankulam
Kaiga Site
Site Site Site Site Site Site
2016 4.24 16.97 30.06 0.50 0.40 1.30 0.075
2017 3.41 40.21 31.20 0.37 0.22 1.30 0.012
2018 3.16 38.30 17.51 0.30 0.19 0.89 0.005
2019 6.52 27.72 16.39 0.48 0.25 0.60 0.004
2020 1.57 14.55 18.00 0.43 0.48 0.64 0.0096

Fig 4.1(a): Public Dose at 1.6 Km distance (Exclusion Boundary) for NPPs (AERB prescribed
Annual Limit is 1000 micro-Sievert (µSv))

Note: 1. Public dose at Rawatbhata and Kapakkam sites are relatively higher as compared to other
reactor sites, due to release of Ar-41 from RAPS-2 and MAPS (which are within the
prescribed technical specication limits).
2. The 1.6 km boundary for Kaiga site is located at 2.3 km.

4.2 OCCUPATIONAL EXPOSURES AERB Safety Manual on 'Radiation Protection for
Nuclear Facilities' (AERB/NF/SM/O-2 (Rev.4),
In each NPP, a Radiological Safety Ofcer 2005) species Dose Limits and Investigation
(RSO) and alternate RSO are designated by the Levels (IL) for occupational workers to control the
Competent Authority for implementation of the individual doses. As per AERB Directives, for an
radiation protection programme. The RSOs are occupational worker, annual dose limit is 30 mSv,
entrusted with the responsibility for providing with the condition that it should not exceed 100
radiological surveillance and safety support mSv in a span of 5 years. The specied annual
functions. These include radiological monitoring dose constraint for radiation exposure of
of workplace, plant systems, personnel, efuent temporary worker is 15 mSv.
monitoring, carrying out exposure control,
exposure investigations, and analysis & trending For better exposure control, individual cases
of radioactivity in plant systems. are investigated and controlled at an early stage
so as to remain within the AERB specied dose
All NPPs have established radiological limits. The following Investigation Levels (ILs)
surveillance programme and work procedures are applicable to the nuclear facilities.
intended to control the occupational exposures.

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AERB Annual Report 2020