ML19257A645
| ML19257A645 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 12/21/1979 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML19257A642 | List: |
| References | |
| NUDOCS 8001070104 | |
| Download: ML19257A645 (3) | |
Text
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.ca SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING AUTHORIZATION TO CHEMICALLY DECONTAMINATE THE PRIE COOLING SYSTEM AT DRESDEN UNIT 1 C050!ONWEALTH EDISON COMPANY DEESDEN NUCLEAR POWER STATION UNIT 1 DOCKET NO. 50-10 IhTRODUCTION By letters dated December 16,1974, April 1,1975 and April 14, 1975, the Co==cnwealth Edison Company (CECO) requested authori:ation to carry out a chemical decentamination of the interior surfaces of the Dresden Unit 1 primary coolant system.
Tne 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. Tne presence of the corresion products in the areas and limits system results in high levels of radiation in adjacent 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 Jaruary 1977 with an anticipated return to service scheduled for Juiy 1977.
.E._VALUATI ON Tne staff's review of CECO's proposed
- chemical decontanination of-the interior surfaces of the Dresden Unit i pri=ary coolant system has been
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completed.
Tne results of this' review are as follows:
1.
Environmental Impact Tne, cher.ical decon:anination of the Dresden i pri=ary coolant system will be performed entirely within a closed deconta ination system.
Tne systen has been designed so that no chemical or radiological wastes will be released to the environment from the decontarination A".1 wastes generated in' the process will be either'solidIYied proc es s.
licensed burial ground er reprocessed for reuse for offsite burial a: 2 The solid wastes produced are similar in type and quantity to onsite.
those handled routinely at the sit e.
Tnerefere, no adverse environmenta'-
ig aets are anticipated due to the decontamination.
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Materials Compatibility The staff has reviewed the results of the material testing program that has been carried out in support of the proposed Dresden I ine test program was organi:ed to look decontamination program.
at corrosive effects during the decontamination process and possible residual effects during subsequent reactor. cperation.
Based upon our review of the results of the testing progran completed to date, we have concluded that the test pregram adequately evaluated those aspects of the materials cc:patibility that we consider to be As a result cf our discussions with Ceco's consultant, important.
Dr. Craig Cheng of Argonne Sa:ional Laboratory, we find that the remaining program will be condue:ed in a manner that will answer our results will be adequately, presently unresolved concerns and the tes interpreted and reported.
h'e conclude that upon the successful completica of the testing program described in the submittals and with an adecuate surveillance and 1 can be inspection program, the Dresden Nuclear Power Statien Unit subjected to the described chemical cleaning process without undue corresion or ether deleterious caterials compatibility effects that would adversely effect the integrity of the primary coolant system and connec:ed syste=s.
A small number of ite=s of concern have not been ressived to the staff's full satisfaction a: this time. However, we conclude that authori:ation to carry out the' chemical decontamination should be granted in anticipation of the successful resolution of these open items in the near future.
The following open ite=s are identified at this time as requiring resolution to the staff's satisfaction:
The materials test program will be cc pleted and the test (a) results will be analyzed and reviewed prior to the beginning of the cleaning process.
Surveillance specimens in addition to those now planned will be (b) determined by mutual agreement with the applicant and a schedule for specimen withdrawal will be stated.
A pre-service inspection program for the pri=sry coolant boundary (c) and scie:y related systens will be for:alated and performed prior to re: urn to power.
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THIS LETTER HAS BEEti If4DIVIDUALLY SEf T TO THE FOLL0tlIftG:
Ms. Denise Dareid Mr. John Power Ms. Carol L. Chmielewski Mr. Walter Heidrich Mr. Mark Frankesin Mr. Scott Ahlstedt Mr. Kevin Geething Mr. James Gossett Mr. Steven Mestra Ms. Cindy Deetzel Mr. Todd Stephenson Ms. Pat Joyce Mr. Arthur Brunetti All are of the following address:
John Hersey High School 1900 E. Thorr.as Arlington Heights, Illinois 60004 a
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