November 2000 Contents Highlight

Armenia Bulgaria Czech Republic Hungary

Kazakhstan Lithuania Russia Slovakia

Ukraine United States Cross-Cutting Activities Planned Activities

Ukraine

Progress reviewed for Zaporizhzhya safe-shutdown analysis

U.S. specialists from Brookhaven and Pacific Northwest national laboratories met in early November with the Ukrainian working group involved in the safe-shutdown analysis for Zaporizhzhya Unit 5. Kyiv Institute Energoproject is performing the analysis.

During the meeting, the U.S. team members provided additional training to working group members on the details of performing the deterministic analysis portion of the overall analysis. The meeting also encompassed a review of the group's draft report, Fire Compartments and Cells. Issues associated with the performance of probabilistic analysis also were discussed. Criteria for defining fire compartments and fire cells were discussed to help resolve issues resulting from this portion of the analysis. Based on the report review and discussions, the working group was able to minimize the number of fire compartments that will have to be analyzed. The group already has identified several fire barrier deficiencies and unsealed penetrations. The deterministic analysis will determine if the deficient fire barriers present safe-shutdown vulnerabilities.

The U.S. team provided Energoproject specialists with a copy of the draft Level 1 probabilistic risk assessment for Zaporizhzhya Unit 5. The report will assist them in conducting the deterministic and probabilistic portions of the project. Portions of the report were reviewed to help the working group to understand what data would be needed to perform the safe-shutdown analysis.

Working group members also received training on the application of probabilistic data to the project tasks along with use of computer modeling techniques. The group discussed the relative merits of using the REVEAL or SAPHIRE computer codes to assist in the analysis. Members determined the SAPHIRE program would be easier and more cost-effective to use for the analysis because the models for Unit 5 already are built.

Energoproject staff gave a presentation on the Access database they developed to support the deterministic analysis. The working group planned to complete entering data into the database later in November. Completion of each fire compartment analysis should be completed in about four months. If this schedule is maintained, the project will be on track to complete the deterministic analysis portion by June 2001. (Grigory Trosman, DOE, 301-903-3581; Andrew Minister, PNNL, 509-376-4938)

Khmelnytskyy safety assessment progress reviewed

U.S. and host-country staff involved in the in-depth safety assessment for Khmelnytskyy NPP held their monthly project review in Neteshin in mid-November. Representatives of Kyiv Institute Energoproject (the Ukrainian technical support organization) and Data Systems & Solutions (the U.S. technical assistance contractor) participated in the review.

The project's U.S. technical coordinator from Argonne National Laboratory reviewed the status and technical quality of the current data collection task. It appears it will take a month longer than projected for this task to be completed. In addition, the group agreed on the scope of task orders related to the plant-specific probabilistic risk assessment. That assessment will be prepared using elements from deliverables now being finalized by the in-depth safety assessment project under way at Zaporizhzhya NPP, the lead plant for Ukraine's nuclear power facilities with VVER-1000 reactors. (Walter Pasedag, DOE, 301-903-3628; Charles Dickerman, ANL, 630-252-4622)