silo 3 - U.S. Department of Energy

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Process Description for the Silo 3 Project
Document No. 40430-RP-0003, Rev. 1
Jacobs Project No. 35H19605
September 5, 2003
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connectiope"for the PVS process duct, the PRS duct (see Section 2.11, and the Exhaust Air
System duct (see Section 6.1.3).
A Continuous Emissions Monitor (CEM) (CEM-19-5208) samples and analyzes the exhaust
air for particulates and radon. A sampling rake is inserted into the stack and is attached to I
a sampling line. The sample travels through the line down to the CEM, where radon is
continuously measured. The sample air stream is passed through a filter paper where a
beta-sensitive radiation detector continuously measures the beta radiation emitted by the
collected particulates. Periodically, samples of the filter paper are subjected to I
confirmatory analyses of both radionuclides and heavy metals. Exhaust air from the CEM is
reinjected into the stack.
If an off-normal condition is detected, an alarm is annunciated and appropriate action is I
taken (e.g., switching the HEPA filters or shutting down the PVS entirely).
Ports for velocity-profile measurements are provided above the sampling rake ports. These
ports are used when necessary to verify flow conditions for compliance purposes.
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