ML20052F134
| ML20052F134 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 02/09/1982 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML20052F128 | List: |
| References | |
| NUDOCS 8205120147 | |
| Download: ML20052F134 (4) | |
Text
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Safety Evaluation Report Quad City Spent Fuel Pool P.odification Occupational Radiation Exposure The staff has revic ed the licensees plan for the removal and disposal of the f
low density racks, and installation of the high density racks with respect to occupational radiation exposure. The occupational exposure for this operation is estimated by the licensee to range from 18 to 39 man-rem. This estimate is based on the licensees detailed breakdown of occupational exposure for each e
phase of the modification. The licensee considered the number of individuals performing a specific job, their occupancy time while performing this job, and the average dose rate in the area where the job is being performed. The spent fuel assemblies themselves contribute a negligible amount to dose rates in the pool area because of the depth of water shielding the fuel. One potential source of radiation is radioactive activation or corrosion products called crud. Crud
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may be released to the pool water because of fue1 movements during the proposed SFP modification. This could increase radiation levels in the vacinity of the pool.
During refuelings, when the spent fuel is first moved into the fuel pool, the addition of crud to the pool water from the fuel assembly and from the in-troduction of primary coolant to the pool water is greatest. However, the licensee does not expect to have significant releases of crud to the pool water during modification of the pools. The purification system for the pool, which has kept radiation levels 'in the vacinity of the pool to low levels, includes a filter to remove crud and will be operating during the modification of the pool.
4 8205120147 820426 DRADOCK05000g
The licensee has presented three alternative plans for removal and disposal of the old racks. These are (1) to crate and ship intact racks; (2) to cut the racks into small pieces with a shredder and pack the pieces into drums for burial; and (3) to have an outside vendor chemically decontaminate the intact If the decontamination option is selected, the decontamination chemicals racks.
would be reduced in volume, solidified and buried. The bulk of the decontaminated racks could be disposed of as clean scrap. This last alternative is to be tested at the Dresden station and results of that work will be influential in the final decision.
In any event, the disposal methodology will follow ALARA quidelines for each of the alternatives.
It should be noted that the procedure for removal of old racks from the pool will be performed independent of the aforementioned l
That is the racks will be individually lifted from the disposal alternatives.
pool water and rinsed by hydrolasing to remove any loose radioactivity that will l
drip back into the SFP water prior to movement to a receiving area for prepara.-
l l
tion for disposal.
Divers will be'used for setting and shimming the high density racks. Relevant experience from the Dresden SFP modification indicates that the diver exposure should be less than 2 man-rem for rack installation including clean-up and diver work.
Based on the manner in which the licensee will perform their modification, and relevant experience from other operating reactors that have performed similar SFP modifications, the staff concludes that the-Quad City SFP modification "can be performed in a manner that will ensure as low as -is reasonably achiev-able (ALARA) exposures to workers.
We have estimated the increment in onsite occupational dose during normal operations after the pool modification.resulting from the proposed increase in stored fuel assemblies at both units. This estimate is based on informa-tion supplied by the licensee for occupancy times and for dose rates-in the spent fuel area from radionuclide concentrations in the SFP water. The spent fuel assemblies themselves contribute a negligible amount to dose rates in the pool area because of the depth of water shielding the fuel.
Based on present and projected operations in the spent fuel pool area, we estiamte that the proposed modification should add less than one percent to the total annual occupational radiation exposure at both units. The small, increase in radiation exposure should not affect the licensee's ability to maintain individual occupational doses to as low as is reasonably achievable levels and within the limits of 10 CFR Part 20. Thus, we conclude that storing additional fuel in the two pools will not result in any significant increase in doses received by workers.
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ISHAM, LINCOLN & BEALE COUNSELORS AT LAW Oset FiftST NATIONAL PLAZA CHICAGO, sLLueOis 40003
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7 1 LEX 2 $288 tt20 CON A
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- April 8, 1982 l
Mr. Doug Collins 622 4th Avenue South Clinton, 7.owa 52732 RE:
Commonwealth Edison Co. -
Quad cities
Dear Doug:
Enclosed in anticipation of our meeting on April 13th are several draft copies of Larry Gerner's testimony on contention 8.
This testimony, and the attached procedures, are not yet finalized or reviewed by all necessary levels of 1
Station management and the final testimony filed on April 30 may differ somewhat.
The one change which I know will be made relates to neutron attenuation testing -- the plan now is to do the testing at Joseph Oat in New Jersey, not in the
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Quad Cities pools.
The discussion on pages 20-21 of the draft testimony will have to be changed to reflect this new j
plan, and Attachment 9, the procedure for this testing, has I
yet to be written.
l l
We cannot promise you that minor changes to this i
testimony and the attached procedures won't be necessary.
l However, E31 son expects to carry out the rack replacement operation substantially in accordance with this draft testimony.
If Intervenors would agree to drop contention 8 based on this information, Edison would agree to obtain the concurrence of the NRC's Senior Resident Inspector, Nick Chrissotimos, prior to making any changes in the enclosed procedures.
Sincefs%y,p i
(
',i Philip P. dteptoe PPS/kb Encs.
l CC: L. Gerner (w/ enc.)
R. Bevan (w/ enc.)
N. Chrissotimos (w/ enc.)
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.