ML19253C949
| ML19253C949 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 12/05/1979 |
| From: | TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML19253C946 | List: |
| References | |
| NCR-MEB-79-42, NUDOCS 7912120428 | |
| Download: ML19253C949 (1) | |
Text
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ENCLOSURE SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 PARTITIONS NOT INSTALLED IN ACCORDANCE WITH DESIGN REQUIREMENTS NCR ME3 79-42 AND NCR 1938 10 CFR 50.55(e)
FINAL REPORT Description of Condition During a preoperational test of the total flooding CO2 fire protection systems, the partitions above several doors were damaged by the CO, pressure. A review of this condition revealed that the partitions'did not meet the 1-1/2 hour fire barrier design requirements.
This was caused by a detailed drawing which was never revised to reflect the current design.
It was also discovered that the design of the total flooding CO2 hazard area enclosures did not consider CO2 Pressures.
Safety Implications These partitions are a part of the fire protection compartmentation design requirements.
Thus, had this condition gone uncorrected, it could have been - 2sible for a fire to spread from one safety-related area to another.
In adcition, the inability of the partitions to maintain t e required CO2 h
concentration in the compartments would have inhf.bited the ability of the total flooding CO2 systems to mitigate a fire.
Corrective Action The damaged partitions will be replaced b, panels with a minimum of a 1-1/2 hour fire barrier rating. The design of the new partitions has been upgraded so that the partitions have a pressure withstanding capa-bility of 50 pounds per square foot in areas where total flooding CO2 fire protection systems are used.
Other partitions and walls in total flooding CO2 fire protection areas will be reevaluated to determine their pressure withstanding capability.
The CO2 systems in areas where damaged partitions were replaced will be retested to verify that the pressu.e withstanding capability of the new partitions is sufficient.
The new partitions will be installed and verification tests will be performed before initial criticality of unit 1.
1540 002 7912120 h
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