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Information Bulletin No. 6
(January 1999)

SPDS for the purpose of Chernobyl NPP Unit 3

Over January 28-29, the interagency acceptance tests were conducted at the Chernobyl NPP of Ukraine. Based on the acceptance tests' results, a corresponding Statement on putting the Safety Parameters' Display System (SPDS) into pilot operation was signed. The SPDS is to render a required information support to the operating staff in determining a resulting influence exerted upon the functions critical for the Power Unit safety.

The tests were conducted following the contents of Tests' Plans and Procedures developed by the NPP Technological Process Complex Automation Systems' Department that is a branch company of the Research & Design Institute of Power Engineering Facilities (below in this text named as "NIKIET") (Russia, Moscow). The SPDS equipment was delivered to the Chernobyl NPP in September 1998 by Consortium Westron (Ukraine, Kharkov). The SPDS functional design and software were developed jointly by NIKIET and Westinghouse (USA). Westron developed the required technical documentation, also assembled and tested the SPDS hardware.
The SPDS Project was funded by the USA Department of Energy. Contractor for the Project was Westinghouse. Also, Westinghouse was Manufacturer and Supplier of the SPDS completing componenets.

Installation and assembling works on the ChNPP Unit 3 SPDS were done jointly by Westron, ChNPP and GEM Co. (Ukraine), within the period of September 18 - October 12, 1998. Quality of the supplied SPDS equipment was inspected in November 1998 by Westinghouse and Parsons Power Co. (USA).

The works on provision of the required power supply system and the SPDS energizing were performed within the period of October 1998 - January 1999 jointly by Russian and Ukrainian companies, also by the Chernobyl NPP.

The NIKIET, before performance of the aforesaid interagency acceptance tests (January 26-27, 1999), conducted, with the technical assistance from Westron, autonomous and complex testing. The SPDS was commissioned by Westinghouse and Parsons Power. This was fixed by issuing a corresponding Protocol on SPDS Commissioning signed by the parties.

Putting the ChNPP-3 SPDS into pilot running provides for a possibility to evaluate the safety level of the Power Unit. The evaluation is based on monitoring of the most important parameters, also on calculation of the required indices. The information gives the Main Control Room operators possibilities to detect quickly any abnormal conditions, also to do analysis and diagnostics of the abnormalities, to determine measures aimed at the abnormalities' removal, to monitor the Power Unit response to the measures taken.

Thus, putting the SPDS into operation adds to the ChNPP-3 safety and operational efficiency.

Westron LLC
1 Akademika Proskury Str.,
Kharkiv 61070, Ukraine
Phone: +380-57-717-0601
Phone/Fax: +380-57-717-7956
E-mail: office@westron.kharkov.ua