ML20043D196
| ML20043D196 | |
| Person / Time | |
|---|---|
| Site: | 07106697 |
| Issue date: | 05/24/1990 |
| From: | Leonard J ENERGY, DEPT. OF |
| To: | Macdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| NUDOCS 9006070244 | |
| Download: ML20043D196 (8) | |
Text
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Department of Energy Washington, DC 20545
. MAY 2 4 L1990 H L
1 Mr. Charles E. MacDonald, Chief
-Transportation Branch Division of Safeguards and Transportation. HMSS U.S. Nuclear Regulatory Commission.
Washington, DC_ 20555 l
Dear Mr. MacDonaldi
~1n reference to your letter of February 27-, 1990, enclosed is.the j
information you requested concerning.the o)erating procedures-_and~
s maintenance program for the Model No. GE 8500 packaging.
This j
linformation is-presented in support-of' DOE's application for renewal of NRC Certificate of. Compliance USA /6697/B(
)..
q If you have any questions on this. matter, please. contact-Steve Primeau~of my staff-at 353-4210.
Sincerely, _
'Y
/
1,.
James F.1 Leonard, Chief Packaging Certification Staff-5// -J2 Office of Quality and-Safety' Programs Environment, Safety and_ Health Enclosure I
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i e-t OPERATI'NG PROCEDURE $ FOR THE USE OF THE GE 8500 (USA /6697/B( )] CASK i
The operating procedures cover inspections, loading, cautionary notes, limits
'i on the package content, radiation monitoring and receiving and unloading the cask.
Instruction checklists are used to document the activities.
q INSPECTION AND LOADING PROCEDURE Perfom an overall visual inspection to ensure that there is no
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significant damage.
Remove the top of the wooden jacket by removing the six 1/2 inch nuts a
and washers.
Inspect the threaded rods for damage.
If the threads or the rods are damaged, make out a nonconformance report and initiate corrective action.
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Inspect the top jacket for damage and perform a radiation survey of the jacket.
Place the jacket on a -clean surface, clear of the jacket body.
Survey the top of the cask.
Inspect the welds on the lifting bail.
F 1.oosen the six bolts on the cask lid using.the following loosening a
sequence:
1,4,2,5,3,6.
(Note:
The bolts are numbered starting with the number 1 bolt at the 12 o' clock position and numbering in sequence clockwise.)
r Lift the lid from the cask body and ~ survey the inner surfaces of the lid.
Survey the inner cavity of the cask.
Inspect the gasket on the lid of the cask.
(Note:
A new seal gasket will be installed every 12 months.)
Load cask with radioactive material.
The amount of radioactive material placed in the cask must not exceed the' allowable amount listed in the certificate of compliance.
(Caution:
If cask is to be loaded remotely because of high dose rate, the safe operating procedures for remote loading of casks must be followed.)
If liquid material is to be loaded into.the cask, the liquid must be contained in a plastic bottle that is compatible with the liquid.
1he plastic bottle must be placed in the 2R container and leak tested according to the GE leak test procedure or the bubble test The 2R container shall have a leak rate f 0.001 atm-cc/sec. procedure.
-Replace lid on cask and turque bolts to 13 ft-1b using the tightening sequencenotedabove(7thbullet).
Place the top of the wooden jacket on the jacket body and secure with the nuts. Torque the nuts to 15 ft-lb.
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Perform radiation survey, soply appropriate markings and labels, install tamper-safe device as per requirements in 49 CTR.
RECEIPT AND UNLOADING PROCEDURE The unloading procedure is the reverse of the loading procedure.
Upon receipt of the package, a thorough radiation survey is made.
Continuous monitoring of the package will be provided as the package is opened'during a nonremote unloading operation.
If the material being unloaded requires remote handling because of the dose rate, plastic sheeting is used to cover the jacket body after the top of the jacket is removed.
This sheeting protects the jacket body from contamination. The cask will be removed from the outer jacket and placed in an airlock for lid removal.
Prior to the lid being removed, the cask will be protected from becoming contaminated. After unloading, the cask will be inspected.
i f any damage has occurred, corrective action will be taken and the components will be reassembled and stored for future use.
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4 MAINTENANCE PROGRAM FOR THE GE 8500 (USA /6697/8( )) CASK The maintenance program ensures that the GE 8500 cask is maintained in such a manner as to prevent degradation that would comproerise its integrity.
The maintenance program involves periodic testing, inspection end repair of components as needed.
If a component fails the inspection or testing, then a nonconfonnance form is completed with appropriate corrective action to fix the deficiency. The corrective action-is based on the requirements in the safety analysis report and the engineering drawings for the GE cask.
All inspection results and maintenance repairs are recorded and documented on appropriate forms.
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INSPECT 10N'AND MAINTENANCE PROCEDURES The components of the GE'8500 package that are inspected and maintained are described in the following subsections.
4 2R Container (Owg. 135C5982)
The container is used when liquid radioactive material is packaged, it is not required when solid radioactive material is packaged.
Surface Condition--must be free of corrosion, gouges, cracks and other deformations.
Threads--must be free of damage no evidence of galling.
Welds--check for cracks, undercuts, overlap,. inclusions or other discon-tinuities.
Seoling surf 6ces--must be free of pits, scratches, burrs, corrosion and other l
imperfections.
l Gasket--replace "0" ring (parker No. 2-228 viton or equivalent).
I Leak test--leak-test the container according to the procedures for periodic-l
<1x10pingofcontainers.
It is required that the container leak rate be leak tes l
atm-cc/sec.
If. the container cannot be sealed to leak less than g
this value, it will,be removed from service.-
Protective Aackets (Dwo-289E796) q Closure -top of, jacket shall fit flat on, jacket body.
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l Surface Condition--must be free from serious gouges, splits, and separations.
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l Interior cavity--must be free from smearable contamination and the surface l
dose rate less than 0.5 mrem /h.
Wall Thickness--must have minimum wall thickness of 4 inches.
l Bolts--must have no damage to threads or deformation of bolts.
Nuts and Washers--must have correct number, proper fit and condition.
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l Cask (Owo. 195F169)
Surface condition--must be free of corrosion, gouges, cracks and other deformations.
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- - outside shell 1
. inside cavity-
- - cover Sealing surfaces-must be free of pits, scratches, burrs, corrosion and other imperfections.
i cask sealing surface e cover Gasket--replace as per part No. 6 Owg.195F169.
Welds..must be free of cracks, inclusions or other discontinuities.
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a PERIODIC LEAK TEST PROCEDURE TOR THE 2R CONTAINER The periodic leak test is performed on the 2R container annually.
The testing is performed by qualified' technicians and is witnessed by a qualified QA representative who ensures the application of supplements 25-1, 25-2, 95 1, and 125 1 of ASMC NQA-1 are invoked.
QNTAINERLEAKTEST!N The testing of the 2R container consists of placing the container in a. vacuum chamber, removing the lid, and evacuating the chamber to about 10 microns of mercury.
The chamber is then back filled with helium and evacuated again and back filled a second time with helium.
The lid is then placed on the 2R container in the helium atmosphere and tightened.
The container is removed from the vacuum chamber and placed in another vacuum chamber that is attached to a helium mass spectrometer leak detector (MSLD).
The vacuum chamber is evacuated using the vacuum system attached the MSLD..
Leakage of helium from the2RcontainerisdetectegbytheMSLD.
A calibrated leak is used so that leak rates in excess of 10- ate-cc/sec can be detected.-
PROCEDURE 1)
Clean the 2R container with ethyl alcohol' to remove any grense 'from the surfaces of the container 2)
Install a new viton "0" ring (equivalent to Parker No. 228).
3)
Place the lid on the container to protect the "0" ring; do not tighten the lid.
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4)
Place the container in the vacuum chamber and remove the lid, placing _it upside down near the container body.
5)
Evacuate the vacuum chamber to 10 microns of mercury and back fill with helium.
Repeat this step twice.
6)
Place the lid on the body of the container and tighten the lid using a spanner wrench until the lid bottoms out against the container body.
7)
Remove the container from the vacuum chamber and place it in the vacuum chamber attached to the helium mass spectrometer vacuum system.
8)
Evacuate the vacuum chamber through the MSLD vacuum system and determine the helium leak rate.
9)
If the leak rate is below 10-7 ata-cc/sec, remove the container from the vacuum chamber and slowly open the container near a helium sniffer.
If helium is present in the container, a massive helium leak will be registered with the mass spectrometer as the helium escapes from the container.
A positive response of the spectrometer indicates the container retained its helium during the leak test and is leak tight.
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If the leak rate is above 10-7 ata-cc/sec, clean the "0" ring and reinstall it.
Apply a very thin coating of silicon grease to the "0" ring anC repeat the above steps.
If the container still= leaks greater-than 1Q~7 ate-ec/sec, remove the container from service and appropriately identl.f.y
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- 11) -Place a accept tag on those containers that pass the leak-test' requirements.
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ROUTINE LEAK TEST PROCEDURE FOR THE 2R CONTAINER j'
The routine leak test is perfonned on the 2R container prior to its being used j
with the GE cask.
The test procedure described here is an alternative leak l
j check procedure that provides the same sensitivity as the leak test procedure described in attachment 0 of the General Electric letter dated November 29, l
1979.
CONTAINER _ LEAK TESTING
'l The testing of the 2R container consists of p1dcIng the loaded container in a glass container of ethylene glycol (bath) and evacuating the bath under a 4
glass bell jar.
The formation of gas bubble streams in the glycol locates individual leaks in the 2R container.
If no bubble are observed, the container is considered to be leaking less than 10-atm-cc/sec and the container is approved for shipment.
PROCEDURE
- 1) Make certain the glycol bath has been degassed properly _under a vacuum.
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- 2) Do not close the lid of the container completely.
Leave about a 1/16-inch gap so that the air. trapped between the lid and the "0" ring seal can escape.
3)
Immerse the bottom third of the container in the bath and swab the bottom of the container with a cotton swab.
This will_ help eliminate any air attached to the bottom of the container.
i 4)
Place the container on the bottom of the glycol bath, making-certain that the container top is immersed about 1/2 inch below the surface of the bath.
- 5) Run a swab around the top of the container and in the-space between the lid and the body of the 2R container.
6)
Swab down the sides and top of the container in the bath to eliminate air attached to thp surface of the cask.
i 7)
Evacuate the bath with the container in it.
Allow sufficient time for the entrapped bubbles around the lid to dissipate.
8)
If a continuous stream of bubble is observed, the container is leaking greater than 0.001 cc/sec.
Remove the container from the bath, clean the "0" ring, and close the-lid with less gap and retest.
I 9)
If no bubbles are observed after 15 to 20 minutes of observation using a bright light and 2X magnification, the container is considered leaking less than 0.001 atm cc/sec.
10)
Remove the container from the glycol bath and rinse with water.
Dry the outside of the container and tighten the lid with the spanner wrench.