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Steam Generator Emergency Feedwater System at Novovoronezh NPP – Lot 1: Motor pump sets of emergency feedwater in to SG and for discharge system of water storage tanks

Steam Generator Emergency Feedwater System at Novovoronezh NPP – Lot 1: Motor pump sets of emergency feedwater in to SG and for discharge system of water storage tanks



The emergency feedwater system (EFWS) at Novovoronezh NPP Unit 5 (VVER-1000/V187) is used to supply feedwater to its four steam generators (SG) in emergency situations and also in start-up and shutdown conditions.

Before the project implementation, all three EFWS pumps were located in one common compartment close to each other, which posed a considerable risk of their simultaneous failure due to a common cause (a fire, flooding, etc. of the compartment). Moreover, the emergency feedwater was distributed to the four SGs through an emergency feedwater header and emergency feedwater lines that were not fully physically separated from the normal operating feedwater system.

Such a configuration imposed elevated risk of the entire feedwater system failure due to a common cause resulting in deterioration of residual heat removal from the reactor in case of a serious accident. This possible loss of a basic safety function (reactor residual heat removal) has been identified by the IAEA as a safety issue of category III.

In the frame of the Novovoronezh NPP Unit 5 Safety Enhancement Programme, an additional EFWS that would meet current safety requirements was to be installed. The EFWS installation project included construction of a separate building for the system housing, installation of the new system equipment, its connection to the existing systems, necessary checks and tests, preparation of the operational and maintenance documentation and system commissioning.

The EFWS had to consist of three redundant trains with each train including:

  • demineralised water tank of 1000 m3 volume
  • pump set supplying up to 150 m3/h of water into SG at related pressure
  • low-pressure and high-pressure pipelines
  • associated valves
  • sensors and other instrumentation
  • independent essential power supply.

The main EFWS equipment had to be supplied through the R1.07/04D project established within the TACIS Nuclear Safety Programme and financed by the European Commission. The equipment supply was divided into 4 lots and implemented under three separate contracts:

  • supply contract number 99580 on the Lot 1
  • supply contract number 129848 on the Lot 2
  • supply contract number 129486 on the Lot 3 and Lot 4.


The objective of the 99580 contract on the Lot 1 was procurement, supply, installation and testing of:

  • 3 motor-driven pump sets for the Emergency Feed Water System (6 kV/800 kW; 5.9 MPa at 270 m3/h)


  • 1 motor-driven pump set for draining of the demineralised water tanks – common to all three 1000 m3 tanks (0.4 kV/20 kW; 0.5 MPa at 50 m3/h)

Including (per pump set):

  • Pump, electric drive (motor ) and coupling
  • Throttle device
  • Base plate
  • Special fittings and mounting parts
  • Built-in instrumentation and control elements
  • Special testing and maintenance tools

A part of the contract were factory and site acceptance tests, contractor’s assistance in on-site installation, pre-commissioning functional tests and EFWS integration tests, delivery of design, operating and maintenance documentation, necessary certificates, spare parts of the individual pumps for 4 years of operation, training of maintenance and operations personnel and after-sales services (maintenance support).


This contract was concluded with the Proletarsky Zavod Company. The contract value was €1,832,779.20.

The contract was signed on 18.7.2007 and the implementation started on 19.7.2007; the place of equipment acceptance was Novovoronezh NPP. The Kick-off Meeting of the contract took place on 17.5.2007. According to the original contract, the equipment had to be delivered within 16 months, but by the Contract Addendum 1 signed on 17.9.2009, the time limit for delivery was extended to 25 months.

The equipment was delivered on 29.9.2009 and the installation was finished on 14.6.2010. The provisional acceptance tests were performed and Provisional Acceptance Certificate was issued on 25. 6.2010. The Final Acceptance Certificate was issued after expiry of the 1-year warranty period on 15.11.2011.

General Information

Steam Generator Emergency Feedwater System at Novovoronezh NPP – Lot 1: Motor pump sets of emergency feedwater in to SG and for discharge system of water storage tanks
€ 1.832.779,20
Budget year: 
Types of activities: 
On Site Assistance
Duration (months): 
Contracting authority: 
Proletarsky Zavod
CRIS number: 
Project reference: 
Decision number: 
Method of procurement: 
Open Call for Tender
Signature date: 
Effective contract date: 
Contract end date: 
Closure date: