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By NIRIDER, L.T.; DOE-RL (US); United States. Dept. of Energy. Office of Environmental Management.; Hanford Site (Wash. ).; United States. Dept. of Energy. Office of Scientific and Technical Information

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Extra resources for Criticality Safety Lessons Learned in a Deactivation and Decommissioning Environment [A Guide for Facility and Project Managers]

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The compensatory measures in the Nuclear Criticality Safety Manual use alternate detectors or notification methods that are considered adequate to notify workers of a criticality. If the LSDW System does not meet audibility requirements and a criticality beacon is not visible, the CAAS cannot reliably notify workers of a criticality. The CAAS annunciation capability may also be inadequate as part of a permanent CAAS audibility/visibilit~~ non-compliant configuration. 7 required compensatory measnres are not met by personnel in the AFFECTED ARIEA, the facility shall either correct the Page 49 of 67 DOE/=-2003-36 Revision 0 deficiency or conduct a controlled evacuation of the AFFECTED AREA or SUSPEND OPERATIONS in the 37 1/374 COMPLEX.

While strippable decontamination coatings may safely be used, this analysis does notpermit their use as the DdiDprocess'will not require them. Existing criticality analysesfor the use of such coatings may be utilized, resulting in significant cost savings in the development of criticality controls. Limits and Controls: The following administrative controls are typical of those that may be applied to the facility D&D when the remaining inventory of plutonium is well known, the NDA characterizationhas been completed, and appropriate criticality safety proganu exist.

The D&D manager erred in his failure to adequately understand the intent of the question and assure that his reply was correct, which contributed to this occurrence. If the D&D manager pursued the question on the use of the provided assay numbers, he potentially would have discovered that the direction given to the crew was inadequate and the correct assay values would have been obtained. Page 41 of 67 DOE/RL-2003-36 Revision 0 Corrective actions included review the incident with all D&D foremen and briefing all D&D crews to ensure they verify 95 percent confidence numbers for packaging; modify the NDA Scan Sheet to better label the column containing the 95 percent confidence numbers used for packaging; and ensure that procedures provided adequate direction for use of correct gram estimation values, and that values are adequately documented for criticality safety purposes.

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Criticality Safety Lessons Learned in a Deactivation and Decommissioning Environment [A Guide for Facility and Project Managers] by NIRIDER, L.T.; DOE-RL (US); United States. Dept. of Energy. Office of Environmental Management.; Hanford Site (Wash. ).; United States. Dept. of Energy. Office of Scientific and Technical Information


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