Common use of Gaseous Radwaste Systems (GRS Clause in Contracts

Gaseous Radwaste Systems (GRS. The gaseous radwaste system (GRS) for each Unit collects and processes potentially radioactive gases generated within the Plant so that offsite exposure is kept as low as reasonably achievable (ALARA). High activity waste gas, containing primarily hydrogen and nitrogen, is collected and stored in the oxygen-free system to guard against a rapid hydrogen/oxygen reaction and to permit decay of short-lived isotopes. Subsequent to decay, the decayed gases are sampled to determine their constituency and radioactivity content, filtered, monitored, and released at a controlled rate to the plant vent. Each system is comprised of a surge tank, two prefilters, two waste gas compressors, three waste gas decay tanks, one discharge filter, discharge flow control valves and instrumentation and related radiation monitoring equipment.