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June 2000
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Armenia
Bulgaria
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Slovakia
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Cross-Cutting Activities
Planned Activities

Slovakia

Risk advisory system implemented at Bohunice

On June 23, a representative of the U.S. team met with project staff at Bohunice NPP to review the U.S. Department of Energy-supported implementation of a risk advisory system for the plant. Key organizations involved in this project and represented at the meeting included the Slovakian nuclear regulatory authority, UJD; RELKO, the host-country contractor for the Bohunice probabilistic risk assessment; and Data Systems & Solutions, who supplied the risk analysis system software. Specialists from Bohunice and Mohovce NPPs participated in the review as well.

The Bohunice risk advisory system consists of the Electric Power Research Instituteís Equipment Out-of-Service Monitor provided by Data Systems & Solutions. Bohunice safety analysts plan to use the risk advisory system for evaluating past activities and planning maintenance activities and other future work. The probabilistic risk assessment team at Bohunice will control access to the system, which initially is planned for plant operators and staff of the training, maintenance, and safety departments. In preparation for system operation, Bohunice recently extended its probabilistic risk assessment and risk advisory system models to include all plant shutdown modes. Implementation of the system at Bohunice was the final task in the U.S. teamís effort in this project. (Walter Pasedag, DOE, 301-903-3628; Jeff Binder, ANL, 630-252-7265; Tye Blackburn, PNNL, 509-372-4092)*

A risk advisory system,(RAS) also known as a safety or risk monitor, is an on-line, plant-specific, real-time analysis tool used to determine the instantaneous plant risk based on actual status of systems and components. A RAS is based on a nuclear power plantís current as-built, operated, and maintained configuration and reflects the status of plant components (e.g., any components out-of-service for maintenance or testing). The underlying RAS model is consistent with the plantís living probabilistic risk assessment (PRA) and is updated with the same periodicity. The RAS makes it possible for plant staff to easily examine past operating practices, current plant conditions, and future planned activities (e.g., maintenance schedules). This is accomplished by providing an easy-to-use interface consistent with terminology and nomenclature familiar to plant staff. The RAS makes the PRA model and resulting insights available to non-PRA analysts (i.e., it "mainstreams" the PRA to those actually operating and maintaining the facility). The result is plant personnel who are risk-aware and who more thoroughly consider impacts to safety from past, current, and planned activities.

The technology and applications of RASs are not new. Development of the technology began in the early 1980s, with the first true RAS installed in 1987 at Heysham Unit 2 in the United Kingdom. Further technology development and refinement eventually led to two commercially available RASs that began to be installed in U.S. plants in the mid-1990s. At present, RASs are installed at more than 100 plant sites in at least eight countries. In addition, the U.S. Nuclear Regulatory Commission recently licensed a RAS for use in training the commissionís inspectors in PRA and PRA applications.


Activity Report
June 2000

Highlight
Armenia
Bulgaria
Czech Republic
Hungary
Kazakhstan
Lithuania
Russia
Slovakia
Ukraine
United States
Cross-Cutting Activities
Planned Activities

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