INSC of Ukraine

South Ukraine unit #1 

Draft report

This report provides a preliminary understanding of the differences in core damage risk profiles predicted by the Level 1 PRA studies of two similar VVER-1000 NPPs, the Novovoronezh Unit 5, Model V-187, and the South Ukraine Unit 1, Model V-302. A major objective of these studies was to identify the main contributors to core damage frequency and to identify plant vulnerabilities. This study presents a comparison of the main initiating event group contributors to core damage frequency. The comparison was made using the final summary reports of the two projects.

Fuel and cladding

FuelUO2 pellet
EnrichmentInitial: 3.0/4.4 %
Pellet Outer Diameter7.57 mm
Pellet Inner Diameter1.4/1.6 mm
Clad Thickness0.65 mm
Pin Height3840 mm
Pin Outside Diameter9.1 mm

Fuel Assemblies

Number of Rods per Assembly317
Fuel Rod Pitch384 cm
Fuel Assembly Pitch467 cm

Core Configuration

Active Core Height3.56 m
Active Core Diameter3.12 m
Average Burnup40000 MWd/tU
Reactivity ControlBoric Acid
Number of Fuel Assemblies151
Configuration of AssembliesHex

Control System

Control Rod Drive Typeel/mag
Number of Control Rods Assemblies109

Primary Coolant

Coolant MaterialH2O
Pressure at Exit from Core6.0 MPascals
Core Inlet Temperature289 deg C
Core Outlet Temperature322 deg C
Number of Primary Pumps4

Coolant Systems

Number of Loops4
Water Chemistry---


Number of Turbines1
Turbine Speed1500 rev/min
Turbine Rating1000 MWe

Vessel and Containment

Vessel Material15X2NMFA
Height10.88 m
Weight304 tonnes
Inner Diameter4.07 m
Wall Thickness0.19 m
Nozzle Diameter0.85 m

Reactor Operations

Fuel Loading---
Operational Strategy---

Spent Fuel Management

no information

Last modyfied: 28.02.2001 Please contact the webauthor if any questions