ML19250B779
| ML19250B779 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 10/19/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| References | |
| NUDOCS 7911050228 | |
| Download: ML19250B779 (1) | |
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UNITED STATES e
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NUCLEAR REGULATORY COMMISSION r,.
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1990 N. CALIFORNf A BOULEVARD 4
g SUITE 202, WALNUT CREEK PLAZA 4, * +,, *,e WALNUT CREE K.CAllFORNIA 94596 October 19,1979 Docket flo. 50-312 Sacramento Municipal Utility District P. O. Box 15830 Sacramento, California 95813 Attention: Mr. John J. Mattimoe Assistant General Manager Gentlemen:
Enclosed is IE Circular No. 79-21, " Prevention of Unpianned Releases of Radioactivity," which provides information on inadvertent releases and on-site spills of radioactivity. Should you have any questions related to the enclosed suggested preventive measures, please contact this office.
Sincerely,
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R. H. Engelken Director
Enclosures:
1.
IE Circular No. 79-21 2.
IE Circulars Issued in the Last Six Months cc w/ enclosures:
R. J. Rodriguez, SMUD L. G. Schwieger, SMUD 1271 138 I) 7911o o D I s
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Accession No.: 7908220128 SSINS:
6830 UNITED STATES NUCLEAR REGULATORY COM?iISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 October 19, 1979 IE Circular No. 79-21 PREVENTION OF UNPLANNED RELEASES OF RADI0 ACTIVITY Numerous incidents o:' unplanned releases of radioactivity have been reported to the NRC within the past few months. These incidents of leaks, overflows and spills have resulted in contamination of areas outside of plant buildings.
The attached table provides you with summary information on these events, their apparent causes, the radiological consequences and the corrective actions.
We believe that a. number of these incidents could have been avoided and oreven-tive actions for these types of unplanned releases should be instituted by all reactor licensees.
Based on the reported incidents, the following preventive measures can minimize the occurrence of such events.
1.
Review of procedures for transfer of radioactive 1fquids.
Errors in written procedures have led to mistakes in valve line-ups and tank overflows. Written procedures, including check lists for valve line-ups, should be developed and followed for operations which could cause spills of radioactivity. Management controls, including audits, should be employed to assure verbatim compliance with such procedures.
2.
Review of "as built" systems having the potential of inadvertent releases because of design or construction errors. Consider items such as:
Tank overflows should be routed to liquid radwaste tanks.
a.
b.
Storm drains should be located away from areas with a high potential for spills.
Consideration should be given to drip pans under equipment, such c.
as pumps and valves, from which leakage is expected, d.
Cofferdams should be installed under doors to areas with a potential for radioactive spills, Preoperational testing should verify that crossconnects do not exist e.
that would permit radioactivity to flow from operating unit (s) to unit (s) under construction.
3.
Periodically functionally test and p of systems that could cause an inadv DUPLICATE DOCUMENT corrosion degradation have occurred to cause leaks. New permanent and Entire document previously entered into system under:
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