Page 93 - AERB Annual Report 2020

Annual
Dose
Quarterly 20 mSv
Dose
Monthly 15 mSv
10 mSv
Dose

The information on number of workers in NPPs and Fuel Cycle Facilities who received dose below
and above 20 mSv during the year 2020 is given in Table 4.1 and 4.2 respectively.

In the year 2020, there was no case of individual radiation exposure above the prescribed annual
dose limit of 30 mSv.

Figure 4.2 gives collective dose (Person-Sv) for operation and maintenance of NPPs for last 5 years.

Table 4.1: Radiation Doses Received by Workers in Nuclear Power Plants (2020)

Number of Average Dose Number of Average Dose Number of Workers
Monitored for Monitored Persons Among Dose Received Dose in the
NPP Person Person Received Receivers Range
Dose
< 20 mSv >20 mSv
(mSv) (mSv)
TAPS - 1&2 1149 2.13 897 2.73 1149 0
RAPS - 1&2 1074 2.55 870 3.15 1074 0

MAPS - 1&2 869 0.83 694 1.04 869 0
NAPS - 1&2 1142 0.54 648 0.95 1142 0
KAPS - 1&2 979 0.82 642 1.24 979 0
KGS - 1&2 911 0.32 454 0.65 911 0
RAPS - 3&4 1292 1.03 870 1.53 1292 0
TAPS - 3&4 1135 0.74 786 1.09 1135 0
KGS - 3&4 1318 0.943 902 1.38 1318 0
RAPS - 5&6 1123 0.58 735 0.88 1123 0
KKNPP - 1&2 2160 0.287 569 1.09 2160 0

KAPP - 3&4 1310 0.0277 127 0.2858 1310 0

Total 14,462 --- 8,194 --- 14,462 0

* KAPP-3 achieved rst criticality on July 22, 2020.

Radiation Facilities As per AERB Directives, for an occupational
worker, annual dose limit is 30 mSv, with the
In each radiation facility, a Radiological condition that it should not exceed 100 mSv in a
Safety Ofcer(s) (RSO) is designated by employer span of 5 years. For better exposure control,
and approved by the Competent Authority. The individual cases ex are investigated and
RSO is entrusted with the responsibility for controlled at an early stage so as to remain within
providing radiological surveillance and safety the AERB specied dose limits. However, any
support functions. These include radiological person exceeding radiation dose of 10 mSv in a
monitoring of workplace & personnel, efuent monitoring period is investigated to establish the
monitoring (in handling of open sources), root cause, work practice and assignment of dose.
excessive exposure investigations and analysis
etc.

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AERB Annual Report 2020