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June 2000
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Czech Republic
Dukovany completes risk advisory system installation
On June 28, Dukovany NPP hosted a review of its recently implemented risk advisory system. Participating in the review were specialists from the Nuclear Research Institute Rez, host-country contractor for the Dukovany probabilistic risk assessment; Dukovany NPP personnel; and SCIENTECH, Inc., whose real-time plant risk software Safety MonitorTM is the basis for the Dukovany system.
The primary audience for the review was a U.S. team representative from Pacific Northwest National Laboratory. The U.S. team had provided technical support to Dukovany to implement the SCIENTECH software, which Dukovany purchased. The review meeting constituted the final project closeout activity for the U.S. team.
Reviewers described how the system was installed and how personnel in the plant’s safety department will use it to evaluate previous activities and plan future work such as equipment maintenance. The plant also will provide a copy to the Czech nuclear regulatory agency for review and use. Dukovany personnel also indicated their immediate plans to extend plant models included in the probabilistic risk assessment to encompass recent design and operational changes and all shutdown modes. (Walter Pasedag, DOE, 301-903-3628; Jeff Binder, ANL, 630-252-7265; Tye Blackburn, PNNL, 509-372-4092)
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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 plant’s 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 plant’s 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 commission’s inspectors in PRA and PRA applications. |
| Activity Report June 2000 Highlight |
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