ML20206M612
| ML20206M612 | |
| Person / Time | |
|---|---|
| Site: | 07109151 |
| Issue date: | 05/13/1986 |
| From: | NUCLEAR ENERGY SERVICES, INC. |
| To: | |
| Shared Package | |
| ML20206M607 | List: |
| References | |
| 83A1902, NUDOCS 8608210277 | |
| Download: ML20206M612 (9) | |
Text
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m NUCLEAR ENERGY SERVICES DOCUMENT NO.
83A1902 REV. O EE "N ~
PAGE 1
nF 7
1.
l BUBBLE LEAK TEST PROCEDURE qq n
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Project Appiscation Copy No Assigned To 6438 APPROVALS TITLE / DEPT. - SIGN ATURE - D ATE REV NO PREPARED BY Project Mgr.
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kyl$lQl[Qg DOCUMENT NO.
33A1902 NUCLEAR ENERGY SERVICES, INC.
PAGE 2
OF 7
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DATE DESCRIPTION APPROVAL n
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FORM #NES 206 2 80
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DOCUMENT NO. _83A1902 GE-3 7
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NUCLEAR ENERGY SERVICES TABLE OF CONTENTS Page 1.
SCOPE 4
2.
REFERENCES 4
3.
PREREQUISITE 4
4.
PRECAUTIONS 5
5.
TECHNICAL APPROACH 6
6.
DOCUMENTATION 7
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t FORM e NES 205 2/80
^
DOCUMENT NO.
1 A eneror Q- :--
PAGE OF NUCLEAR ENERGY SERVICES BUBBLE LEAK TEST PROCEDURE D. SCOPE This procedure specifies the requirements of soap bubble leak tests used to demonstrate the integrity or condition of gasket seals, seating surfaces, threaded fittings, flanges, and welds. This procedure is primarily intended to test the seals of Type A, as defined in 10CFR71, transport casks where a quantitative measure of the leakage is not required.
i
- 2. REFERENCES 2.1 ANSI N14.5, " Standard for Leakage Tests on Packages for Shipment of Radioactive Materials" (1977) Appendix A.
2.2 NES 81A1050," Quality Assurance Program Plan for NES Transport Casks".
2.3 Title 10 Code of Federal Regulations Part 71.
2.4 ASTM, " Standard Method of Testing for Leaks Using Bubble Emission Techniques," ASTM E515-74.
- 3. PREREQUISITES 3.1 OPERATIONAL 1.
Proper radiological precautions shall be used during all phases of this procedure.
2.
The cask shall be examined visually for the condition of the gasket and seal surfaces.
3.
All cask surfaces and fittings shall be clean and free of materials which could affect leak test sensitivity. Grease, rust, weld slag and other surface FORM s NES 205 2,60
83A 1902 '
DOCUMENT NO.
1 A sawr or Q-- 7 --
3 7
PAGE OF-NUCLEAR ENERGY SERVICES contamination may be a source of bubbles giving false indications of leakage. Cleaning, when necessary, shall be performed in accordance with the appropriate cask cleaning or maintenance procedure.
4.
Contaminated detection fluid or one that foams on application can cause spurious surface bubbles on the test specimen.
5.
The test shall be performed by NES approved personnel.
3.2 EQUIPMENT 1.
Leak Detector Solution - Commercial Bubble Leak Test Solution.
2.
Pressure Gauge - air range from 0 to 20 psig, calibration accuracy +/-l.0%
of reading.
3.
Pressure Regulator - Matheson #8-BF-590 or equivalent.
4.
Vapor /Degreaser - removes moisture and oil from supplied air.
5.
Relief Valve - Set and checked at 10% above the maximum test pressure.
6.
Miscellaneous - air isolation valves, clamps, and tubing as required.
- 4. PRECAUTIONS 4.1 Pressure regulator settings should be checked to make sure cask will not be over pressurized.
4.2 Assemble and check all air connections, valves, and gauges prior to pressurizing the system.
4.3 During step 5.1.6, pressurized air is released through the shutoff valve. Keep face and hands away from the valve at this time.
FORM # NES 205 2/80
83A1902 DOCUMENT NO.
1
^^^
^
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6 7
PAGE OF NUCLEAR ENERGY SERVICES 4.4 All personnel shall stay as far as practical from pressurized components (cask, lines, plugs, fittings, relief valves, etc.) during initial system pressurization.
- 5. TECHNICAL APPROACH 5.1 LEAK TEST PERFORMANCE 1.
Place all lids, plugs, valves, and fasteners in the normal closed position.
Component closures (lids and plugs) should be attached according to the i
appropriate operating procedures.
2.
Attach equipment as shown in Figure A-1.
Either the lid vent plug (as shown) or the cask drain plug may be used, depending upon the convenience of the operator and the cask being tested.
3.
Pressurize the cask to eight (8) psig and maintain this pressure for at least fif teen (15) minutes.
4.
Close shutoff valves and isolate the cask from the pressure source.
5.
Apply bubble detection fluid to all potential leakage areas. Take care in applying the fluid to prevent formation of bubbles. Flow the solution on the test area, completely covering the joint. With good lighting, examine the area for bubbles in the fluid. Apply acceptance criteria per Section 5.2.
6.
Record any drop in pressure during step 5.1.3.
7.
R91 ease the remaining pressure after completion of steps 5.1.2 and 5.1.3 by opening the vent valve to the atmosphere.
FORM s NES 205 2/80
^
DOCUMENT NO.
7 7
PAGE OF-NUCLEAR ENERGY SERVCES 5.2 ACCEPTANCE CRITERIA 1.
No bubble formation shall be visible to the unaided eye on any of the suspected leakage areas.
2.
Failure of the leak test is the observance of bubbles in the leak detecting fluids. Should failure of the leak test occur, the following steps shall be applied, as required, depending upon the nature of the test failure:
CAUTION: Do not attempt to repair or replace any parts prior to performing step 5.1.7.
a.
If a plug is leaking, tighten the leaking plug. Retest according to Section 5.1. If a second plug failure is experienced, replace plug and seal per appropriate cask maintenance procedure.
b.
If a gasket is leaking, inspect and/or replace the gasket according to the appropriate maintenance procedure. Retest per 5.1 (all steps).
- 6. DOCUMENTATION The data sheet shown in Figu e A-2 shall be completed to record the results of the leak test. This data sheet shall be filed with the specific cask maintenance and inspection report file.
FORM s NES 205 2/B0
DOCUMENT NO. __ 83A1902 PAGE _ A I op - A2 NUCLEAR ENERGY SERVICES
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..6 FIGURE A-1: TYPICAL LEAK TEST SETUP FORM 8 NES 205 2/80
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DOCUMENT NO. 83A1902 PAGE _A2 og A2 NUCLEAR ENERGY SERVCES 1.
CASK ID:
2.
SITE:
Name City State 3.
ASSOCIATED SHIPPING MANIFEST:#
O 4.
AMBIENT AIR TEMPERATURE:
p 5.
RELATIVE HUMIDITY:
mm.Hg.
6.
PRESSURE SUPPLY: ( ) Bottled Air ( ) Site Air 7.
AIR PRESSURE AT START:
psig hrs Amount Time 8.
AIR PRESSURE AT COMPLETION:
psig hrs Amount Time 9.
REGIONS INSPECTED:
OBSERVATIONS:
10.
RECOMMENDATIONS / COMMENTS:
l 11.
Pressure gauge #:
Calibration Date:
1 12.
Results:
( ) Pass
( ) Fail Date Technician l
FIGURE A-2: LEAK TEST DATA SHEET FORM a NES 205 2/80
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