ML20126K375
| ML20126K375 | |
| Person / Time | |
|---|---|
| Site: | 07109151 |
| Issue date: | 05/06/1985 |
| From: | NUS CORP. |
| To: | |
| Shared Package | |
| ML20126K372 | List: |
| References | |
| WM-012, WM-12, NUDOCS 8506110006 | |
| Download: ML20126K375 (11) | |
Text
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REVISION PAGE WM-012 D
1 of 11 PAOCESS SEAVICES g
NUS-14-170 SERIES I MAINTENANCE
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COPYRIGHT
- 1985 BY NUS PROCESS SERVICES CORPORATION l
ALL RIGHTS RESERVED.
NO PART OF THIS DOCUMENT MAY BE REPRO-1 DUCED OR TRANSMITTED IN ANY FORM OR BY ANY MEANS, ELECTRONIC l
OR MECHANICAL, INCLUDING PHOTOCOPYING, RECORDING OR BY ANY INFORMATION STORAGE AND RETRIEVAL SYSTEM, WITHOUT PERMISSION IN WRITING FROM NL S PROCESS SERVICES CORPORATION, EXCEPT FOR STRICTLY CONTROLLE9 DISTRIBUTION, FOR EVALUATION PURPOSES.
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ORIG 'NATOR DATE CHECKED DATE OA DATEJMANAGER DATE NUS PROCESS SERYlCES
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REvlS80N PAGE WM-012 D
2 of 11 TABLE OF CONTENTS Page 1.0 PURPOSE 3
2.0 APPLICABILITY 3
2.1 Primary Lid Gasket 3
l 2.2 Secondary Lid Gasket 3
2.3 Ratchet Binder 4
l 2.4 Secondary Lid Studs / Nuts 4
4 3.0 DEFINITIONS 4
4.0 REFERENCES
5 5.0 RESPONSIBILITIES 5
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6.0 TOOLS AND MATERIALS 6
7.0 GASKET / SEAL REPLACEMENT 6
7.1 Primary Lid Gasket Replacement 6
7.2 Secondary Lid Gasket Replacement 7
l 7.3 Secondary Lid fiolddown Stud Replacement 8
7.4 Leak Testing 8
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REVISm PAGE WM-012 D
3 of 11 r
1.0 PURPOSE This procedure describes the correct methods of gasket and ratchet binder replacement on the NUS14-170 Series 1 shipping cask.
The NUS14-170 Series 1 shipping ~ casks include units with'29 inch or 16 inch secondary lids. This procedure is performed to ensure that all parts and materials used are in compliance with the applicable l
Nuclear Regulatory Commission issued Certificate of Compliance and'that proper records are maintained when gasket or binder replacement is required.
2.0 APPLICABILITY This procedure is applicable to all gasket and ratchet binder replacement operations performed on the NUS14-170 Series 1 shipping cask.
2.1 Primary Lid' Gasket 2.1.1 Replace gasket every twelve (12) months.
2.1.2 Inspect primary lid gasket primary -lid
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painted alignment' markers prior-_to placement of the primary lid 'on the cask.
Gasket must be free of defects such as nicks, frays, and cuts and the painted alignment markers must be clear and not severely chipped or faded.
Replace the gasket or repaint the alignment markers, to
.i correct the defects.
i, 2.2 Secondary Lid Gasket 2.2.1 Replace gasket every twelve-(12) months.
12.2.2 Inspect secondary lid gasket and secondary i
lid' painted alignment markers to 1
1.
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REVISION PAGE WM-012 D
4 of 11 i
l placement of-the secondary lid on the primary lid.
Gasket must be free of defects and the painted alignment markers must be clear and not severly chipped or faded.
Replace the gasket or repaint the alignment markers to correct the defects.
2.3 Ratchet Binder 2.3.1 Replace ratchet binders as necesssary to ensure positive closure of the primary lid to cask body.
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2.3.2 Ratchet binders must be inspected prior to securing primary lid to cask body.
Ratchets must operate freely through the complete designed travel distance.
All working parts must be free of defects such as cracks.
If inspection reveals defects, replace ratchet i
binders.
2.4 Secondary Lid Studs / Nuts 2.4.1 Replace secondary lid studs and/or nuts as necessary to ensure positive closure of the shield. plug to-the primary lid.
2.4.2 Secondary lid. studs and nuts must be inspected.
prior to ' securing shielded plug to the primary lid.
Studs and nuts must tm free of defects such as thread nicks and cracks.
- If inspection reveals defects, replace.
3.0 DEFINITIONS 3.1 Primary lid gasket - 76.2" I. D. X 79. 2" O. D. X 0.38" Thick Solid Neoprene Durometer 40 i
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REVISION PAGE WM-012 D
5 of 11 3.2 Secondary Lid gasket 3.2.1 15 inch Secondary Lid - 18.5" I.D. X 22.5" O.D.
X 0.38" thick Neoprene Durometer 50 3.2.2 29 inch Secondary Lid - 31.5" I.D. X 35.5" O.D.
X 0.38" thick solid Neoprene Durometer 50 3.3 Ratchet Binder - 1 3/4" X 8" Galvanized Type J 1-l 3.4 Secondary Lid Stud - Driver Type Stud 3/4" - 10UNC-2A ASTM A-19 3 Gr B-7 l
3.5 Secondary Lid Nut - Hex head 3/4" - 10UNC-28 ASTM A-194 Gr B-7 3.6 Shield plug and Secondary lid are synonymous and may be used in documents and references interchangeably.
4.0 REFERENCES
4.1 NUSPSC Procedure Preparation and Control Procedure No.
i OA-001.
4.2 NUSPSC Operating Instructions for Loading 'and Unloading the NUS-14-170. Series 1 Shipping. Cask' Procedure No.
4.3 U.S.
Nuclear Regulatory Commission Certificate of Compliance No. 9151.
4.4 U.S.N.R.C.
Safety Evaluation Report on Model No.
NUS-14-170 Series 1 shipping-cask Docket.No. 71-9151.
4.5 NUSPSC Inventory Control Procedure No. AD- 00 2.
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NO.
WM-012 RIVISION O
PAGE 6 of 11 4.6 NUSPSC Procurement Procedure No. AD-001 4
S'. 0 RESPONSIBILITIES The Manager, Transportation Services is designated as the project man' Agar for all cask maintenance operations.
He is specifically tasked with ensuring that all inspections and y
maintenance is. per formed in a timely manner, that all
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maintenance records are properly maintained and that maintenance,information is distributed to registered cask
, [,
users in a timely manner.
. 'b TOOLS AND-MATERIALS 6
6.1 Gaskets 6.1.1 Primary Lid Gasket 6.1.2 Secondary Lid Gar et 6.2 Ratchet Binders 6.' 3 Secondary Lid Studs 6.4 Secondary Lid Nuts 3,
6.5 Gasket Scraper or clean metal scraper knife
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6.6 Steel wire brush - drill type or handheld 6.7 Acetone ?
6.8" Gasket adhesive (Permatex* Super Glue adhesive, Master
- Super Weatherstrip adhesive, or other brand adhesives
.which are recommended by the manufacturer for bonding
' rubber to metal) 4
g' REVISION PAGE WM-012 n
7 of 11 7.0 GASKET / SEAL REPLACEMENT 7.1 Primary Lid Gasket Replacement 7.1.1 Remove old flat gasket by hand or use metal scraper, using care to prevent damage to seating surfaces. Discard old gasket material using proper radiological procedures.
7.1.2' Clean entire gasket seating surfaces (both cask body and lid) by using a steel wire brush along with acetone as a cleaning solvent and lubricant.
7.1.3 Inspect all seating surfaces for foreign material or nicks which would prevent proper seating and sealing.
7.1.4 Inspect new replacement gasket for nicks, frays and cuts.
Discard unusable materials.
7.1.5 Fit gasket ~to cask body surface and cut to fit around guide pin.
Maintain 1/2" cross section of gasket material on the inside of the guide pin.
7.1.6 Place gasket adhesive on cask body.
7.1.7 Hold gasket in place until initial adhesive sets.
7.1.8 Make butt joints using adhesive between the two
-gasket surfaces.
Compress to fit..
See Figure 1 for an example of how such a butt joint can be made.
Other joint angles are acceptable as
.long as the joint is flush and free of gaps.
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REvlS80N PAGE WM-012 D
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Figure 1 Gasket Adhesive
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45' Approximately Gasket Joint Detail 7.1.9 Complete Attachment I and retain in cask users book.
7.2 Secondary Lid Gasket Replacement 7.2.1 Remove old flat gasket by hand or use metal scrapper, using care to prevent damage to seating surfaces.
7.2.2 Clean entire gasket seating surfaces (both pri-mary lid and secondary lid) by using a steel wire brush along with acetone as a cleaning solvent and lubricant.
7.2.3 Inspect all seating surfaces for foreign material or nicks which would prevent proper sealing.
7.2.4 Place gasket in shield plug and mark bolt holes.
7.2.5 Punch 7/8" holes in gasket at marked spots.
7.2.6 Place adhesive on primary cask lid and hold gasket in place until adhesive is set.
7.2.7 Complete attachment 2 and retain.in cask user's book.
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REvl3Km PAGE WM-012 D
9 of 11 l
7.3 Secondary Lid Hold Down Stud Replacement l
Secondary lid studs may be replaced and/or repaired in the following manner:
Heli coil insert Increase depth of tap, drill and retap 3/4" 10UNC using 3/4" - 100NC-2A stud of appropriate length.
Material as specified in NUS Drawing No.
8916-M-2003, Item 7.
7.4 Leak Testing 7.4.1 Prior to acceptance of a NUS-14-170 Series 1 shipping cask from the fabricator, a properly witnessed pressure test shall be performed and reviewed in accordance with NUSPSC Procedure WM-Oll Leak Test.
7.4.2 After gasket replacement, conduct a leak test in accordance with Procedure WM-011. This test shall be to test gasket and gasket seating surface integrity only.-
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REVISION PAGE WM-012 D
10 of 11 NUS14-170 Series 1 Primary Lid Gasket Replacement Checklist Cask Serial Number:
Initials Date 1.
-Old gasket removed 2.
Gasket seating surfaces clean and free of foreign material and nicks.
(Step 7.1.3) 3.
Replacement gasket acceptance (Step 7.1.4) 4.
Gasket Inventory No:
5.
Installation completed (Step 7.1.5 thru 7..l.8) 6.
Gasket replaced and provided in accordance with maintenance Procedure Number WM-012.
Signature Date 7.
Visual inspection of painted alignment markers satisfactory?
Yes/No Alignment markers repainted?
Yes/No Signature
-Date 8.
Other-Maintenance (describe):
Signature Date
1 NO.
REVISION PAGE WM-012 D
11 of 11 NUS14-170 Series 1 Secondary Lid Gasket Replacement Checklist Cask Serial Number:
Initials Date 1.
Old gasket removed (Step 7.2.1) 2.
Gasket seating surfaces clean and free of foreign material and nicks.
(Step 7.2.3) 3.
Replacement gasket acceptance 4.
Gasket Inventory No:
S.
Installation completed (Step 7.2.4 thru 7.2.6) 6.
Gasket replaced and provided in accordance with maintenance Procedure Number WM-012.
Signature Date 7.
Visual inspection of painted alignment markers satisfactory?
Yes/No-Alignment markers repainted?
Yes/No Signature Date 8.
Other Maintenance (describe):
Signature Date L