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At 23:38 hours on January 24, 2013, while performing daily source checks on portable radiation meters, the Shepherd Model 78-2 Calibrator (Serial # 9047) failed a pre-operational source interlock check. The 130 mCi /130 Ci Cs-137 sources were able to be raised while the shield door was not fully shut. This is reportable under 10 CFR 70.50(b)(2) since the interlock is required by license to prevent the accidental raising of the source with the door open. There is no equipment considered to be redundant to the interlock. The cause of the failure has not been determined at this time. No personnel were exposed to the sources. Sources were returned to the shielded position, the calibrator was locked and removed from service. A survey of the calibrator after securing the sources showed dose rates within expected ranges. The affected calibrator is not part of any installed plant equipment and has no impact on plant operation. The licensee notified the NRC Resident Inspector.

• * * UPDATE FROM STEVE PRUSSMAN TO CHARLES TEAL ON 2/6/13 AT 1105 EST * * *

The licensee has changed the reporting criteria to 10 CFR 30.50(b)(2). The NRC Resident Inspector has been informed. Notified R1DO (Powell).