Part 21 Report - 1995-166
ACCESSION #: 9505180280 The HARRISON STEEL CASTINGS CO. POST OFFICE BOX 60 PHONE 317-762-2481 ATTICA,INDIANA 47918 March 24,1995 US Nuclear Regulatory Commission Region III 801 Warrenville Road Lisle, IL 60532-4351 Reference: NRC License No. 13-02141-01, Amendment 25 Subject: Equipment Breakdown The Gamma Ray Department called me yesterday afternoon to report that they noticed smoke coming from the Amersham Model 957 Automatic Exposure controller which was installed with a model 680 Cobalt 60 projector at our north exposure room this past December. They terminated the exposure by manually cranking the source back into 680 projector. Our electrician determined that a capacitor on a circuit board in the 957 had failed. The extent of any other damage was not determined. Amersham was notified, and requested that we return the 957 for repair. They are to send out a return authorization and instructions. The radiographers asked if they could continue using the manual crank to operate the cobalt 60 source until the 957 was actually removed for return to Amersham. They were about half finished with a large casting that required a rather elaborate setup. Although our license does not specifically address this question, it was my opinion that we would not be in violation by continuing to radiograph the casting as described. This opinion was based on the following reasons. 1. The only functions that were not working normally were the automatic positioning of the source, the timer, and the automatic retraction if someone passed the warning gate and broke the photoelectric beam while the source was exposed. The failure did not affect the exposure device, control cable, or crank. 2. The alarm and warning light interlock system were completely functional except as described above. This was verified during the quarterly audit of this date. 3. The iridium 192 camera in the same exposure vault is operated manually. The source does not automatically retract when the photoelectonic beam is broken. 4. The radiographers do not deviate from their normal Page 1 of 2 practices of maintaining surveillance or locking off the exposure area during exposures, always carrying an operable and calibrated survey meter into the exposure rooms, etc. This is not a reportable event under 10 CFR; however, I am providing the information to forstall any confusion at some later date. Please contact me if you have any comments or desire additional information. Sincerely yours, The Harrison Steel Casting Company W.D. Hollander, RSO cc: R. Shepherd H. McBride Page 2 of 2 *** END OF DOCUMENT ***
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