Pressure vessel fluence monitoring at NPP with VVER: Routine technique and new approaches
- Scientific and Engineering Nuclear and Radiation Safety Center, Moscow (Russian Federation)
For Reactor Pressure Vessel (RPV) neutron fluence monitoring at a nuclear power plant (NPP) with VVER-type reactor the Russian Nuclear Regulatory Body (GOSATOMNADZOR) has recently recommended use of the ex-vessel cavity dosimetry combined with neutron transport calculations. By using activation dosimeters with long-lived reaction products on the base of {sup 54}Fe, {sup 58}Ni, {sup 46}Ti, {sup 60}Ni, {sup 63}Cu, {sup 55}Mn and {sup 59}Co the routine experiments are now carried out. The VVER cavity dosimetry methodology has been developed on the basis of experimental results obtained at Rovno NPP Unit 1 (Ro-1), Unit 2 (Ro-2), Unit 3 (Ro-3), Novovoronezh NPP Unit 5 (NV-5), Yuzhno-Ukrainsk NPP Unit 1 (YuU-1) with VVER-440 and VVER-1000. The set of experiments has been performed during the various reactor fuel cycles including the low leakage core. More accurate evaluation of integral neutron spectrum in cavity is possible by using short-time irradiations of the dosimeters with short-lived reaction products. Now performing cavity experiments also include {sup 237}Np, {sup 238}U and {sup 93}Nb detectors. The track detectors, similar SSTR, may be used for cavity dosimetry, and now such set dosimeters are available for installation in cavities of some VVERs. Also the on-line fluence monitoring technique is now developed. A summary of experimental and calculational results is presented.
- OSTI ID:
- 55574
- Report Number(s):
- CONF-930809-; ISBN 0-8031-1899-6; TRN: 95:012819
- Resource Relation:
- Conference: 8. ASTM-EURATOM symposium on reactor dosimetry, Vail, CO (United States), 29 Aug - 3 Sep 1993; Other Information: PBD: 1994; Related Information: Is Part Of Reactor dosimetry. ASTM STP 1228; Farrar, H. IV; Lippincott, E.P.; Williams, J.G.; Vehar, D.W. [eds.]; PB: 871 p.
- Country of Publication:
- United States
- Language:
- English
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