On November 11, 2013, the licensee was performing a degassing evolution to the waste gas system while the
oxygen and
hydrogen analyzers were
inoperable and the
hydrogen recombiner was not functional. The inspectors identified that the licensees procedures and compensatory measures for degassing without all equipment in service may have been inadequate to properly control the
oxygen concentration in the waste gas system. The inspectors are awaiting the completion of the licensees root cause evaluation to determine the licensees compliance with applicable procedures and
TS 3.11.2.5, which limits
oxygen concentration in the waste gas system. Additional inspection activities are needed to determine the extent of condition, relative to procedural and TS compliance during operation of the waste gas system. Pending the results of this additional inspection, an
URI will be opened and designated as
URI 05000400/2013005-02, Potential Performance Deficiency Associated with
Oxygen Concentration in the Waste Gas System.
