ML19340A908
| ML19340A908 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 12/09/1976 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML19340A906 | List: |
| References | |
| NUDOCS 8009080582 | |
| Download: ML19340A908 (3) | |
Text
{{#Wiki_filter:. f -w . a. {E53 UDitTED STATES ~ (* NUCLEAR REIULATORY COMMISSk.. "9 n'
- d WASHIN2TCN D. C. 21555
.. n SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION =.. SUPPORTING AU1110RIZATION TO CHEMICALLY DECONTAMINATE THE PRIMARY COOLING SYSTEM AT DRESDEN UNIT 1 ] COMMONWEAL 711 EDISON' COMPANY DRESDEN NUCLFJR POWER STATION UNIT 1 DOCKET NO. 50-10 I.R _IhTRODUCTION By letters dated December 16, 1974, April 1, 1975 and April 14, 1975, the Commonwealth Edison Company (CECO) requested authorization to carry z..g-out a chemical. decontamination of the-interior surfaces of the Dresden Unit 1' primary coolant. system. The purpose of the decontanination is to remove a deposition of activated corrosion products which is tightly bonded to the primary coolant system piping and components. The presence of the corrosion products in th.e system results in high levels of' radiation in adjacent areas and limits = access to these areas for the purpose of in-service inspection, routine maintenance and plant modifications. CECO has tentatively scheduled the chemical cleaning project to begin in January 1977 with an anticipated return to service scheduled for ~ July 1977. EVALUATION The staff's review of CECO's proposed chemical decontauination of the interior surfaces of the Dresden Unit 1 primary coolant system has been completed. The results of this review are as follows: 1. Environmental Impact The chemical decontamination of the Dresden 1 primary coolant system will be performed entirely within a closed deconta rination system. The system has been designed so that no chemical or radiological wastes will be released to-the environment from the decontamination ={ process. All wastes generated in the process will be either solidified for offsite burial at a licensed burial ground or reprocessed for reuse onsite. The solid wastes produced are similar in type and quantity to l those handled routinely at the site. Therefore, no adverse environmental 1 impacts are anticipated due to the decontamination.
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'Ihe staff has reviewed the results of the material testing program '!{:2 l that has been carried out in support of the proposed Dresden 1 ~% i decontamination program. The test program was organized to look l at corrosive effects during the decont. amination process and possible
== residual effects during subsequent reactor operation. Based upon our review of ths results of the testing program completed l to date, we have concluded that the test program adequately evaluated those aspects of the materials compatibility that we consider to be ~~~ z [ important. As a result of our discussions with CECO's consultant,
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[ Dr. Craig Cheng of Argonne National Laboratory, we find that the l remaining program will be conducted in a manner that will answer our presently unresolved concerns and the test results will be adequately interpreted and reported.
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We conclude that upon the successful completion of the testing program _ _.,.. ~ des'cribed in the submittals and with an adequate surveillance and
- 7..T inspection program, the Dresden Nuclear Power Station Unit I can be
- ,,c subjected to the described chemical cleaning process without u
- . he corrosion or other deleterious materials compatibility effects that we>uld adversely effect the integrity of the primary coolant system and connected systems.
~ A small number of items of concern have not been resolved to the staff's full satisfaction at this time. However, we conclude that l authorization to carry out the chemical decontamination should be j granted in anticipation of the succes,sful resolution of these open l items in the near future. The following open items are identified
== l at this time as requiring resolution to the staff's satisfaction:
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== l (a) The materials test program will be completed and the test results will be analyzed and revi'ewed prior to the beginning of the cleaning process, (b) Surveillance specimens in addition to those now planned will be determined by mutual agreement with the applicant and a schedule for specimen withdrawal will be stated. (c) A pre-service inspection program for the primary coolant boundary and safety related systems will be formulated and performed prior to return to power....
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= 3. Effluent Treatment Systems ...l =+:=. We have determined that the effluent treatment system, if constructed -l:F5 as described in the CECO submittals, is capable of handling the types
== and quantities of effluents expected to be generated by the decon-tamination program. Our review was limited to the use of the ffstem
- = =i for chemical decontamination only, and use of the system for any other
,=?; purpose subsequent to that program must be reviewed prior to such use. 4. Radiological Safety We have further concluded that the radiological safety program I described in the submittals is adequate to assure that the health and ' c5j safety of the public and the onsite personnel will not be endangered 5F- : by the Dresden 1 decontanination project. . CONCLUSION .;.1 We have concluded, based on the considerations discussed above, that: [ (1) because the chemical cleaning does not involve a significant increase in the probability or consequences of accidents previously considered and does not involve a significant decrease in a safety margin, the cleaning project does not involve a significant hazards consideration, (2) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed 3::anner, and (3) such activities will be conducted in compliance with the Commission's regulations and the issuance of this amendment will not be inimical to the common defense and security or to the health and safety of the public. e .m Date: '."f. : DEC 0 91976 a
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