ML13330A185
| ML13330A185 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 01/14/1981 |
| From: | Baskin K Southern California Edison Co |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| TASK-3.D.3.3, TASK-TM NUDOCS 8101270751 | |
| Download: ML13330A185 (2) | |
Text
Southern California Edison Company P. 0. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD, CALIFORNIA 91770 K. P. BASKIN TELEPHONE MANAGER OF NUCLEAR ENGINEERING, (213) 572-1401 SAFETY, AND LICENSING January 14, 1981 Director, Office of Nuclear Reactor Regulation Attention: D. M. Crutchfield, Chief Operating Reactors Branch No. 5 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Gentlemen:
Subject:
Docket No. 50-206 Steam Generator Repair San Onofre Nuclear Generating Station Unit 1 By letter dated November 28, 1980, you forwarded the report entitled, "Interim Assessment by the U. S. Nuclear Regulatory Commission's Office of Nuclear Reactor Regulation Related to Sleeving of San Onofre Unit 1 Steam Generator Tubes, Docket No. 50-206, November, 1980."
The report contained, in part, the Regulatory staff's radiological assessment of the occupational radiation exposure expected to result from the steam generator tube sleeving planned for San Onofre Unit 1.
This letter confirms telephone discussions with the Regulatory staff in which we indicated several errors in Section 4.2, Public Radiation Exposure, of the aforementioned report. Specifically,.the errors are contained in the third through sixth sentences of the first paragraph on page 12 associated with the description of the measures which are being taken to minimize releases as a result of the sleeving project. The sentences are quoted below:
"A14O, an enclosure tent will be erected around the steam generator cha gel head manway to prevent the release of contamination from the steam.generator. Air from the enclosure will be exhausted through a highfefficiency particulate filter. The water from the decontamina tioni process will be treated by filters and demineralizers to mi-iize liquid releases. The main source of liquid releases, laundry waste water, will be treated by demineralizers."
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D. M. Crutchfield, Chief January 14, 1981 As has been discussed with the Regulatory staff, enclosure tents are not required and will not be erected around the steam generator channel head manway to prevent the release of contamination from the steam generator.
During the early stages of planning, enclosure tents were being considered in this area for cleanliness and environmental control during the sleeve/tube upper joint fabrication process and not to prevent the release of contamina tion from the steam generator. However, the qualification of the process indicated that these enclosure tents were not necessary.
Based on our September 26, 1980 letter (Reference 4 of the aforementioned report), the control of airborne concentrations during channel head work will be achieved by exhausting the air from the channel head where the work is being performed through the opposite manway using a high effi ciency particulate filter. In addition, our September 26, 1980 letter did indicate that tent enclosures will be erected at selected locations inside containment to control contamination during process equipment maintenance.
With respect to the fifth and sixth sentences quoted above, the fifth sentence should be revised and the sixth sentence deleted. The basis for these changes is that the water from the surface preparation process will also be treated by filters and demineralizers, and "laundry waste water" will not be a source of liquid releases.
In accordance with the information discussed above, the third through sixth sentences of the first paragraph quoted above should be replaced with the following sentences:
"The air from the channel head where the work is being performed will be exhausted through the opposite manway using a high effi ciency particulate filter to control airborne concentrations during channel head work. Also, enclosure tents will be erected at selected locations inside containment to control contamination during process equipment maintenance. The water from the decontamination process and the surface preparation process will be treated by filters and demineralizers to minimize liquid releases."
Based on telephone discussions, it is our understanding that the Regulatory staff concurs in the revised sentences discussed above. In addition, a corrected page 12 reflecting the revised sentences will be issued shortly for incorporation into the aforementioned report.
If you have any questions or desire further information concerning this matter, please contact me.
Very truly yours,