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The Nuclear Regulatory Commission has cited Wal-Mart Stores, Inc., with four violations concerning improper disposal and transfer of tritium exit signs at its stores throughout the United States and Puerto Rico. The violations, issued Oct. 28, concerned the improper transfer or disposal of 2,462 signs from Wal-Mart stores in states under NRC jurisdiction between 2000 and 2008, and the improper transfer of an additional 517 signs between various Wal-Mart facilities. The company also failed to appoint an official responsible for complying with regulatory requirements and failed to report broken or damaged signs as required. Exit signs containing tritium, a radioactive isotope of hydrogen, pose little threat to public health and safety and do not constitute a security risk. However, the NRC requires proper recordkeeping and disposal of the signs because a damaged or broken sign could cause minor radioactive contamination of the immediate vicinity, requiring environmental clean up. The improper transfer or disposal of the 2,979 signs and failure to appoint a responsible official were determined to be a Severity Level III problem under NRC's enforcement policy, and the failure to report damaged signs is a Severity Level IV violation, the lowest on the NRC's enforcement scale.

The Nuclear Regulatory Commission has cited Wal-Mart Stores, Inc., with four violations concerning improper disposal and transfer of tritium exit signs at its stores throughout the United States and Puerto Rico. The violations, issued Oct. 28, concerned the improper transfer or disposal of 2,462 signs from Wal-Mart stores in states under NRC jurisdiction between 2000 and 2008, and the improper transfer of an additional 517 signs between various Wal-Mart facilities. The company also failed to appoint an official responsible for complying with regulatory requirements and failed to report broken or damaged signs as required. Exit signs containing tritium, a radioactive isotope of hydrogen, pose little threat to public health and safety and do not constitute a security risk. However, the NRC requires proper recordkeeping and disposal of the signs because a damaged or broken sign could cause minor radioactive contamination of the immediate vicinity, requiring environmental clean up. The improper transfer or disposal of the 2,979 signs and failure to appoint a responsible official were determined to be a Severity Level III problem under NRC's enforcement policy, and the failure to report damaged signs is a Severity Level IV violation, the lowest on the NRC's enforcement scale.

It began in late 2007 as a routine audit. Retail giant Wal-Mart noticed that some exit signs at the company's stores and warehouses had gone missing. As the audit spread across Wal-Mart's U.S. operations, the mystery thickened. Stores from Arkansas to Washington began reporting missing signs. They numbered in the hundreds at first, then the thousands. Last month Wal-Mart disclosed that about 15,800 of its exit signs - a stunning 20 per cent of its total inventory - are lost, missing, or otherwise unaccounted for at 4,500 facilities in the United States and Puerto Rico. Poor housekeeping, certainly, but what's the big deal? In a word: radiation.