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The main tasks and problems of VVER reactor pressure vessel (RPV) dosimetry are reviewed taking into account the RPV metal characteristics, the peculiarities of surveillance programs and some features of irradiation embrittlement of VVER-440 and VVER-1000 RPV materials. The problems of dosimetry of VVER-1000 surveillance program are discussed separately. The experimental dosimetry programs, which are carried out in this time, are briefly summarized. It's concluded that there are the serious reasons for improvement of VVER dosimetry.

In the paper, the physical model of a doped scintilator is described. The Monte Carlo type code NEU-7 [Cvachovec, Cvachovec, and Tajovsky, Nucl. Math. Inst. Phys. Res. A, Vol. 476, 2002, pp. 200–202], which was created for a NE-213 and stilben type scintillators containing also hydrogen and carbon only, was extended for scintillators containing 10B, 11B, and O also. The modified NEU-7 code is called NEUB-7, and with it the response function for scintilator BC-523A doped with 4.41 % 10B was calculated. The dimensions of the cylindrical scintilator are 5 × 6 in.2, corresponding to the real detector. The created response matrix was implemented in the unfolding code with the maximum likelihood method.

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