ML20148A200
| ML20148A200 | |
| Person / Time | |
|---|---|
| Issue date: | 10/19/1978 |
| From: | Baer R Office of Nuclear Reactor Regulation |
| To: | Carmouche L DOW CHEMICAL CO. |
| References | |
| NUDOCS 7810300029 | |
| Download: ML20148A200 (6) | |
Text
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UNITED St ATES p
't pN NUCLEAR REGULATORY COMMisslON.
WASHINGTON. D, C. 20555 ft.....,/-
OCT 1.91978 Mr. L. N. Carmouche General Manager
-Functional Products & Systems Dow Chemical Company.
2020 Dow Center Midland, Michigan 48640 l
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Dear Mr. Carmouche:
SUBJ ECT: DOW TOPICAL REPORT NO. DNS-RSS-001-P, "RADI0 ACTIVE WASTE SOLIDIFICATION SYSTEM" We have completed our initial review of your.radwaste topical report and require the additional information detailed in Enclosure 1.
We expect to complete our review of the information submitted by your letter of September 7, 1978 by mid-November 1978.
At that time, a meeting,between your staff'and our reviewers has been suggested by your representative, Mr. Bruce Owen.
Please call us if you have questions.
Sincerely, f,
Ne V
Robert L. Baer, Chiefb Light Water Reactors Branch No. 2 Division of Project Management
Enclosure:
Request for Additional Information cc w/ enclosure:
Mr. J. B. Owen Manager, Radioactive Waste i
Nuclear Services' i
Dow Chemical Company 2020 Dow Center Midland, Michigan 48640
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OCT 19 878
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ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION DOW CHEMICAL COMPAllY DOW TOPICAL REPORT NO.
DNS-RSS-001-P RADI0 ACTIVE WASTE SOLIDIFICATION SYSTEM
OCT 17 578 AUXILIARY SYSTEMS BRANCH FIRE PROTECTION 5AFETY EVALUATION TOPICAL REPORT, "THE DOW SYSTEM FOR SOLIDIFICATION OF LOW-LEVEL RADI0 ACTIVE WASTE FROM NUCLEAR POWER PLANTS" j
The Dow proposal recognizes that their radwaste treatment sy[ tem has an inherent fire hazard associated.
The fire hazard is primarily due'to the use of a vinyl ester as a binder material.
(a) State the basis for adding the binder into the drum before any waste is added and how it is safely controlled.
(b) The illustrated method (on page 23) of transferring the binder is not acceptable as shown, e.g., the small drum can move and cause the transfer line to break loose.
Also, include in your transfer method details, a description of how the vinyl ester is moved from the bulk storage tank outside to the process area inside to assure that fire hazards are minimal.
(c)
Describe the process and area controls and interlocks (including
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ventilation system controls) that help ensure fire safety through-out the entire process.
(d)
Provide information that demonstrates that inadvertent striking of the 55-gallon drum by the mixing blades will not cause sufficient mechanical energy release to ignite the binder vapor.
(e) State the basis for sizing the solidification binder storage tank at 5,500 gallons and recommend how it should be located to isolate it from the process area and from safety-related systems.
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(f)- Describe the mixing sequence in detail and state the effect of mixing the catalyst and the amine promoter together to assure Liat uncontrolled reactions do not occur with resultant fire hazards.
(g)
Details.are needed to evaluate the process safety involving the use of sulfuric acid, sodium hydroxide, and nitric acid.
For example, state how are these chemicals are stored, used, and what will happen if operator error causes improper mixing.
(h) State the interface parameters, process location restrictions, and other special design considerations that a utility should be aware of l
to ensure that no deleterious impact on the remainder of the nuclear plant will take place.
'(i)
State the conditions r.ccessary to prevent an explosion to occur in the process area and how they will be implemented and maintained.
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OCT 191978 310 ACCIDENT ANALYSIS DRANCH
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i The heating and combustion tests which were performed on the simulated end products indicated that significant amounts of materials cou'ld be released to the atmosphere in the event of a fire.
Perform a conservative analysis of the off-site radiological consequences following a postulated accidental release of radioactivity from a fire involving the end product.
State 511 the assumptions made and indicate all the parameters used in the analysis.
Unless the presence of a combustible material (oil, etc.) to feed the fire be precluded, a fire involving such material and the end product can must be assumed.
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OCT 191978
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331-1 i
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12.0 R1D10LOGI_ CAL ASSESSMENT BRANCH 331.1 Identify the part of the plant in which the verification of (2.1,p.6).
waste characteristics process will be performed. and procedures and/or design features which will be used to maintain radiation exposures ALARA during the process.
J 331.2 Describe the precautions taken to ensure that the mixer is (3.1, p. 13) removed from the emulsion at the end of the 1-1.5 minute mixing period or before gelation of the radwaste emulsion occurs.
331.3 Provide a detailed layout drawing of a typical DOW radwaste (4.0, p. 22) solidification system facility showing:
low and high radioactive waste storaqe areas; fill and cap area; radwaste control area; truck loadout area; and waste baler.
include the radiation zone designations for each of these areas.
331.4 Based on the specific desion features of the DOW radwaste (4.0, p. 22) solidification system, provide an estimate of the man-rems associated with each of the following functions:
opera tions,
maintenance, and inservice inspection.
State the basis, models, and assumotions used to arrive at these values.
331.5 Describe what procedures will be followed in the event that (4.10, p. 32) the total activity of the filled drum, measured by the monitors at the wipe station exceeds the allowable DOT regula tions.
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