ML20235F053
| ML20235F053 | |
| Person / Time | |
|---|---|
| Site: | Westinghouse |
| Issue date: | 04/15/1987 |
| From: | Nardi A WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | Crow W NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| 28087, LA-87-17, NUDOCS 8707130190 | |
| Download: ML20235F053 (7) | |
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U. S. Nuclear Regulatory Cotamission p un ATTN:
Mr. W. T. Crow, Act1/g Chief p,p Uranium Fuel Licensing bronch 2
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Division of Fuel Cycle and Naterial Safety J-Office of Nuclear Material Safety and Safeguards
'9 g3 Washington, D. C.~20555 p,m stcnCN v,. post cLEM /Q Gentlecen:
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Subject:
Hydrocarbons in UF6 cylinaers and process systems.
Reference:
NRC Letter dated 3/2/87 from W. T. Crow to A. J. Nardi.
The Westinghouse Electric Corporation hereoy submits the 6ttached occuments as Proposed Lic6nse Demonstrations and Conditions that precludes the introduction of foreign containments in IJF6 cylinders and process t.ystems.
Tne proposed License Demonstrations and Corsditions are formatted as
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sections 1.12 and 2.2.17, respectively, f or ircertion into NRC license SNM-1107.
Section 1.11 was previously submitte'J as a Draft License Demonstration for calcium fluoride.
If you have any questions, please contact me at the abpve address or by telephone on (412)374-4652.
Very truly yciars, E n s G L /.1,c A. J. Narci.. thuger NES License Accanistratson WP1200E:3p.63 f
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ATTACHMENT TO #dSTINGHOUSE LETTER DATED APRll 15, 1987 PROPOSED LICENSE DEMONSTRATION 1.12 F0FElGN CONTAMINATES IN UFC CYLINDERS AND P90 CESS SYSTEMS i
The presence of toreign contaminates in UF.
cylinders and process systems is prev 0nted through controls associated with UF.
- receipt, procecsing, cold t rar. ping, maintenance, storage and t ranspor tat ion.
The first category. UFs receipt, describes those controls associated with receipt of UFs in Model 30 shipping packagings.
This category also 4
covers cyl.inder procurement.
The second category, UFs processirg, describes controls ansociated wi th processing cylinder] (vaporization by both IDR or ADU systems).
This catcgory covers preoperationai cylinder and process checks, processing and post operational cylinder checks.
The third category, UF. cald trapping, describes controls acsociated with cold t rappirg operations from Model 30 to Model 8 Ur cylinders.
This category speci fically addresses the cont rols that are maintained to prevent oiI additions to UF. cyIinders.
The fourth category, UF. process ard cylinder maintenance, describes tne aspects of maintenance involving UF. cylinder (valve replacemcat and decertification) and process systems (oil filled pressure gauges).
The fifth category, storage and transportation, describes the controls associated wi th on-site storaag of cylinders and, in addition, transport of cylinders of f-si te to be refilled, washerl or recen t ified.
1.12.1 UF6 fiECElPT UFc is received in Model 30 cylinders in NRC/ DOT authorized packagings.
These cylinders are inspected for damage upon receipt so as to ensure cylindet integrity.
Cylinders (non-Westinghouse) are further inspected to determine that they are constr.ucted and racertified in accordance with ANSI N14.1, " Packaging of Uranium He/afluoride for Transport."
Valve covers ate removed for weight veri ficetion, at this time, the tamper safe sesl is inspected.
If the seal has beer, compromised, the cylinder will not be accepted for processing.
Cylinders that are acceptable Oueet defined requirements) are disposi tioned for storage to await processing.
l New cylinders (Wes t a nghou se - owned )
are designed, fabricated.
- tested, I
inspccted and cleaned in accordance wiib ANSI N14.1 to assure that foreign contaminates are eliminated prior to initial use of each cylinder.
j Thereafter, cyIinders are washed and recerti fied within the f requency as defined in ANSI N14.1.
Page No. _1.12-1 _
Docket No. /0-1151 initial Submittal Date: _
Revision N0.
License No. SMM-1107 Revision Su bittal Date:
1.12.2 UF6 PROCESSING Cylinders are transferred ' rom storage to the UFs Bay where they are staged for process checks.
Cylinders are cold vacuum checked to ensure cyIinder integrity through the transportation and storage period.
Cylinders that do not have acceptable vacuun are tagged for engineering j
disposition.
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Cylinders are then placed in vaporizat on chests for processing.
Pigtails are inspected for cleanliness and conne.ct ed to the cylinder valve and process line to permit the flow of UF.
from the cylinder to the conversion process system.
Connections are made while the cylinder valves are closed.
Uylinder line UF. pressure is monitored via a diaphram pressure gauge.
These pressure gauges are limited to halocarbon oils that are compatible with UF..
Oil additions to line pressure gauges are identifio in area operations procedures.
These procedures speci fically describe that halocarbon oiIs are to be used.
In addition, halocarbon oils and grease are used elsewhere on proces.; lines that may contain UFs.
Actuator valves with interlocks on process lines ensure that foreign contaminates will not backflow to the UF. cylinders.
After cylinder processing, an on-line eduction system is used to further reduce the uranium content of the cylinder.
This eduction process uses E
only nitrogen.
After eduction.
the cyIinder valve is closed and the pigtail removed.
After cooling, a vacuum check is performed.
If the cylinder is not under acceptable weight or vacuum, the cylinder is dispositioned for cold trapping.
Acceptable weight and vacuum cylinders then have tamper safe seals applied to valves and are dispositioned for storage.
1.11.3 UF6 C0l_D TRAPPING The UFs cold trapping systems (IDR and ADU) are designed for further eduction of.UF. (to " heel" quantities) from Mode 1 30 UFs cyIinders.
The systems consist of the following:
(1) refrigeration compressor, (2)
Model 8 cr 12 cold t rap cylinder, (3) refrigeration chamber for Model 8 or 12 cytinder, (4) alumina packed columns. (5) oiI trap and (6) vacuum pump.
In addi tion, the IDR cold trapping system is equipped with a heat exchanger for heating model 12 cylinders on-line.
UFi gas flows from Model 30 cylinder to Model 8 or 12 cylinders by vacuum transfer where it is cooled and condensed to solid UF..
Heat (steam or hot water) is of ten applied to the Model 30 cylinder to enhance this transfer process.
Uncondensed UFs is collected in one of two alumina packed columns connected in series between the Model 8 and 12 cylinders and the oii trap.
This process continues untiI the Mode 1 8 and 12 cylinders are filled to an approved limit.
Once fiiled, the Mode 1 8 and 12 cylinders are processed on a conversion line.
Docket No. 70-1151 initial SubmittaI Date _ _ _ _
Page No.
1.12-2 License No. SNM-1107 Revision Submittal Date.
Revi ion No.
To prevent foreign contaminates foils) f rom entering the Model 8.
12 and 30 cylinders, oil traps are installed between the cylinders and the vacuum pumps.
This oil t rap has a volume capaci ty of approximately '.5 times the oil volume capacity of the vacuum cump. Oil traps are provided with drain valves to allow inspection and re1 oval of materials prior to oil addition to the vacuum pump To further safeguard cold trap operatiens, only oiis and greases compatible m th UF.
(halocarbon) are used in the vacuum system.
Cold trapping Model 8 and 12 cylinders are also designed, fabricated, inspected and tested in accordance wi th ANSI N14.1, Standard for packaging of UFs for transport, 1.12.4 UF6 PROCESS AND CYLINDER MAINTENANCE 4
I Foreign contaminates are eliminated from UF.
process systems and cylinders through an effective maintenance program.
Maintenance on UFs piocess systems encompasses process lines, valves and gauges.
Process I
lines and valves are maintained to ensure their integrity from leakage and possible entry paths for foreign contaminates.
Maintenance of prescure gauges involves routine calibrations and additions of oiis compatible with UFs (i.e.,
when oiI type gauges are used on
)
UFs process lines).,
Foreign contaminates in UF cylinders are minimized or eliminated 4
through detailed procedures describing UFs cylinder valve replacement, in addi tion to washing and decertifying of cyIinders in accordance with ANSI N14.1 guidelines.
When cylinder valves are shown to be defective, the cylinder is disposi t ioned f or valve replacement.
The procedure for valve replacement ice down of cy inder, 2) clean cylinder top af ter ice down, j
involves:
1)
- 3) position ventilation tent over vaporizer, 4) obtain, inspect and clean,
)
if necessary, replacement valve, 5) remove valve under ventilation tent,
- 6) immediately install replacement valve. 7) establish cylinder vacuum prior to processing.
This procedure ensures that foreign contaminates will not enter UFs cylinders during valve replacement.
Breached cylinders remain under continuous operations and/or maintenance surveillance untii secured (i.e.,
valve replaced).
The new valve is then equipped with a tamper safe seal, i f disposi tion for storage.
1 UFs cylinders are also routinely washed, inspected and decertified in accordance with ANSI N14.1 guidelines.
This will ensure removal of any foreign contamination that may have entered the cylinders.
1.12.5 UF6 STORAGE AND TRANSPORT UFs cylinders are stored in approved areas while awaitin0 processing or transport.
Tamper safe seals are placed on all cylinder valves and plugs to detect tampering and possible entry of foreign contaminates, of cylinders that are dispositioned for storage outside the facility.
Docket No. 70-1151 initial Submittal Date: __
Revision No.
Page No.
1.12-3 1.i cense th. SNM ~ 1107 Revision SubmittaI Date:
1 4
$owever, cylinders in the UF, Bay are excluded from tamper sealing, as well as cylinders disposi tioned for decommissioning or washing.
Cylinders in the UF. Bay are considered in process until released for storage.
Cylinders disposi tioned for transport ifull. heel and decertified cylinders) are inspected fer damage and the integrity of. appropriate tamper safe seals established prior to release.
Cylinders in' good condi t ion (i.e.,
valves and plugs) will not permit entry paths foi foreign contaminates.
Transportation of cylinders off-site (fulI, heei and decertified on ly ) generally require sole use of the ' t ranspor t vehicle.
l l
f Page No. _1._12-4,_
Docket No. 70-1151
!ni tial Subnd t tal Date: _ _.. _.,
Revision No. _
I License No. SNM-1107 Revision Submittal Date:
1 I
l
l ATTACHMENT TO WESTINGHOUSE LETTER DATED APRIL 15, 1987 PROPOSED LICENSE CONDITIONS 2.2.17 FOREIGN CONTAMINATE IN UF6, CYLINDERS AND PROCESS SYSTEMS The following shall be provided as part cf the UFs receipt, processing, cold trapping, rrc. i n t enance,
storage and transportation controls that
)
preclude the introduction of foreign contaminates into UFs cylinders and process systems.
2.2.17.1 Tamper safe seals on cylinder valves and plugs shall be inspected upon cylinder receipt.
j 2.2.17.2 New cylinder procurement shall be in accordance with the current revision of ANSI N14.1.
Existing cylinders shall be cleaned, tested and inspected, so as to comply with the intent of ANSI N14.1.
2.2Property "ANSI code" (as page type) with input value "ANSI N14.1.</br></br>2.2" contains invalid characters or is incomplete and therefore can cause unexpected results during a query or annotation process..17.3 Tamper safe seals shall be applied to UFs cylinder valves and plugs (heels, decertified and new cylinders) di.spositioned for highway transportation.
Full cylinders shall have tamper safe seals applied to the outer protective package.
2.2.17.4 Oil traps shall be provided for cold trapping systems with a volume fraction (oil trap-to-vacuum pump) of 1.5.
2.2.17.5 Oii t raps shalI be inspected prior to oiI additions to vacuum pumps for detect ion of oil bac!< flow.
2.2.17.6 Oil and grease usage in UFs process and cold trap systems shall be limited to those compatible with UFs (halocarbon).
'2.2.17.7 Procedures shal l be provided to prevent the int roduct ion of contaminates to UF cylinders during valve replacements.
4 Docket No 70 1151 initial Submittal Date: ___
Revision No. _ _ __
Page No.
2 1 4_
License No. SNM 1107 Revision Submittal Date: _ _ _ _
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