ML19259B042
| ML19259B042 | |
| Person / Time | |
|---|---|
| Issue date: | 10/03/1977 |
| From: | Kniel K Office of Nuclear Reactor Regulation |
| To: | May J NEWPORT NEWS INDUSTRIAL CORP. (SUBS. OF NEWPORT NEWS |
| Shared Package | |
| ML19259B041 | List: |
| References | |
| NUDOCS 7901160008 | |
| Download: ML19259B042 (4) | |
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J Mr. J. R. May, Manager Newport News Industrial Corporation
'7 Radwaste Management Systems
- 1 230 - 41st Street 74,,
Newport Hews, Virginia 23607 e
Dear Mr.. May:
SUBJECT:
RADWASTE VOLUME REDUCTION SYSTEM TOPICAL REPORT j, c w.
We have reviewed your subject report and find that we need additional infomation concerning system design bases and design criteria.
Enclosed is our request for this infomatc....
We will require this information by November 11, 1977 in order to complete our review as scheduled.
Sincerely..-
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K. Kniel
. J; Karl Kniel, Chief r
Light Wacer Reactors Branch No. 2 Division of Project Management
Enclosure:
Request for Additional Information
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l REQUEST FOR ADDITIOHAL It! FORMATION REPORT NUMBER: EI/Hg-77-7 REPORT TITLE: RWR-1 Radwaste Volume Reduction System (June 24,1977)
ORIGINATING ORGANIZATION: Energy Incorporated / Newport News Industrial Corporation REVIEWED BY: Effluent Treatment Systems Branch
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In your discussion of the sizing of the RWR-1 System, an intermediate E
case for boiling water reactors is used as the basis. Justify why the system is not sized to handle the largest volumes expected as indicated in' Table 2-1, for a 3500 MWg plant. The system should be sized to handle approximately 1220 m / year. Explain the statement on page 12 that 264 days of operation per year is considered the maximum for your pro-posed system.
2.
Present tg System offgas exhaust line to the plaat stack.
design criteria and function of the radioactivity monitor in the RWR-1 3.
Jushfy your stateent on page 46 that the bed media has been demonstrated to be functional. at temperatures required for incileration and calcination.
Describe in detail the inert heat-transfer media pcoposed as the bed media, including heat-transfer characteristics, expected service life, attrition, corrosive effects, interactions with radioactive and non-radioactive feed materials.
4.
Justify your statement on page 48 that "the fluidized-bed combustion pro-cess is a very efficient one."
Support with data the efficiency you expect for this process.
5.
How do you ensure that the center of particles do not remain unoxidized?
(page 48).
6.
Describe in detail the spraying step of the calcination mode of operation.
Include flow rate, possible plugging, corrosive effects. Describe the remote cleaning of the atcmizing nozzles, including frequency, duration, secondary wastes produced, and treatment for these secondary wastes.
7.
Describe ir, detail the scrub liquid employed in the quench tank.
Include chemical composition and additives, boiling point, vapor pressure, possible toxic and corrosive effects.
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8.
On page 51 you indicate that iodines captured in the scrub solution are retained long enough to decay to stable xenon. Provide and justify this expected retention time.
9.
Present and justify the design pressures for your statement on page 53 that "the possibility of combustion products filtering back through the feed system is remote because the waste is injected into a region of the incinerator where the pressure is lower than ambient pressure."
- 10. For the offgas system, discuss the design criteria, sizing requirements, in-place testing criteria, and expected service life for the demister, iodine adsorber and HEPA filter. Describe the design of the HEPA fil.ter wherein each filter has a.oughing and finishing section, as indicated on page SS. Discuss the proposed agent to be used as the iodine adsorber.
Justify with data your assumed decontamination factor (DF) of 625 for this iodine adsorber.
- 11. You state on page 54 that "the fluidized bed vessel is tall enough to provide adequate residence time above the bed for ccmbustion to take place before the entrainod particulate matter is exhausted into the dry cyclone." Provide the dimensions of the vessel and justify why the height.
above the bed allows sufficient time for complete combustion before leaving the bed.
- 12. Desc-ibe the " automatic corrective action" that is initiated when the bed temperature drops, as indicated on page 59.
- 13. For the scrub liquid flow to the quench tank nozzles, provide the basis for the automatic flow that is optimum for efficient gas scrubbing and cooling.
Provide this optimum efficiency, and discuss the effects of not achieving this optimum efficiency. Describe the protective action required when the quench system malfunctions as indicated by high temperature in the gas exit line (page 60).
14 For the venturi scrubber, provide the optimum particle removal and the basis upon which the scrub liquid ficw to the venturi is automatically con-trolled to ensure this optimum particle removal.
- 15. Provide the results of the corrosion tests described on page 62 and the final material selections.
- 16. Provide the basis upon which the fonnation of hcl from the ccabustion of feed plastic can be controlled by adjusting scrub liquid chemistry.
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- 17. DF's for equipment in series can only be obtained by mul tiplying indivi-dual equipment DF's when the decrease in inlet concentration through each piece of equipment is considered. You have not considered this effect in your calculaticn of of fges syst0ms DFs. Therefore, provide offgas system DF's based on expected operation as the concentrations.3re reduced by each piece of equipment. Similarly, a DF of 16 for the quench tank and venturi scrubber in combination is not applicable if a DF of 4 for each component is based on the same inlet concentrations. Base your analysis on conservative DFs.
- 18. De. scribe in detail the provi^ ions for drum filling and capping, in-cluding overflow provisions.
- 19. Describe in detail how you propose to immobilize in a solid matrix the products of calcination, in accordance with Branch Technical P9sition, Effluent Treatment Systems Branch No.11-3, " Design Guidance for Solid Radioactive Waste Management Systems Installed in Light-Water-Cooled Nuclear Power Reactor Plants."
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