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EJ/T 307-2014Requirements on application of uranium hexafluoride cylinder (English PDF)

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Issued by

State Administration of Science, Technology and Industry for National Defense, PRC

Level / Type

National · Recommended

Issue date

November 17, 2014

Implementation date

February 1, 2015

Scope

EJ/T 307-2014 (Requirements on application of uranium hexafluoride cylinder) is available as an English-translated PDF.

EJ/T 307-2014 - This Standard specifies the management and application methods of UF6 containers. This Standard applies to the application of 1L, 60L, 300L, 740L, 1,000L and 3m3 UF6 containers, and shall be considered as a reference for the application of other UF6 containers.

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Document preview — EJ/T 307-2014

National Standard of the People's Republic of China

ICS: 27.120.30
Classification: F 79

Issued by: State Administration of Science, Technology and Industry for National Defense, PRC

Foreword...3
1 Scope...4
2 Normative references...4
3 Acceptance and assembly of new containers...5
4 Tests conducted to new containers...6
5 Passivation of new containers...8
6 Serial numbers, weighing, lead sealing, and filing of containers...8
7 Storage, transportation and handover of the vessels containing materials...10
8 Process operating rules...11
9 Container cleaning...13
10 Periodic test of containers...16
11 Repair and scraping of containers...16

Foreword

This Standard replaces EJ/T 307-1996 Requirements on application of uranium

hexafluoride cylinder.

Compared with EJ/T 307-1996, this Standard has the main changes as follows.

a) ADD the requirements that the stainless steel containers need to be

conducted with cold-hot test when operating at -196°C;

b) ADD the methods of pressure test and gas leakage test;

c) ADD the requirements of paint identifications for serial-number 300L,

740L, 1,000L and 3m3 containers;

d) ADD the item that the allowable loading amount of containers shall not be

greater than 3.0kg when the loading abundance of 1L containers is less

than 5%;

e) CHANGE the pressure test cycle of 60L containers from 3a to 5a.

CHANGE the pressure test cycle of 1L containers whose loading

abundance is less than 5% from 1a to 5a;

f) ADD the requirements of critical control during the hydrolysis;

g) ADD the relevant requirements for scrapping containers;

h) USE the contents referenced from EJ/T 190 to replace the contents of

Item c in Article 6.1.3.3 of the previous Standard;

i) ADD the operating provisions of liquid filling;

j) DELETE Table 4 in the original Standard.

This Standard was proposed by China National Nuclear Corporation (CNNC).

This Standard shall be under the jurisdiction of the Institute for Standardization

of Nuclear Industry.

Drafting organization of this Standard. CNNC Lanzhou Uranium Enrichment

Co., Ltd.

Main drafters of this Standard. Zhou Junjie, Wu Tingfang, Xin Zhiyi, Li Jiangang,

Zhang Minhua, Wei Xiangpeng, and Jing Mingxuan.

This Standard was first released in 1987, and was first revised in 1996.

Requirements on application of

uranium hexafluoride cylinder

1 Scope

This Standard specifies the management and application methods of UF6

containers.

This Standard applies to the application of 1L, 60L, 300L, 740L, 1,000L and

3m3 UF6 containers, and shall be considered as a reference for the application

of other UF6 containers.

2 Normative references

The provisions in the following documents become the provisions of this

Standard through reference in this Standard. For dated references, the

subsequent amendments (excluding corrections) or revisions do not apply to

this Standard. However, parties who reach an agreement based on this

Standard are encouraged to study if the latest versions of these documents are

applicable. For undated references, the latest versions apply to this Standard.

GB 150 Steel pressure containers

GB/T 3864-1996 Industrial nitrogen

GB 11806 Regulations for the safe transport of radioactive material

GB 15146.3 Nuclear criticality safety for fissile materials outside reactors –

Part 3.Requirements for nuclear criticality safety in the storage of fissile

materials

EJ/T 190-1994 Technical conditions for steel containers

EJ/T 303 1L UF6 containers

EJ/T 304 60L UF6 containers

EJ/T 305 300L UF6 containers

EJ/T 306 1,000L UF6 containers

EJ/T 350 740L UF6 containers

buckles. The engagement length of the threads between the bolts of embedded

valve bodies and the valve bodies shall not be less than 1.5 times of the bolt

diameter. The bolts and nuts shall have Phi2mm lead sealing holes.

3.2.9 The tin-plated valves shall be screwed in for 7-12 buckles, while the

container plugs shall be screwed in for 5-8 buckles. The screwing torque shall

be within the range of 280-560N·m. The valves and plugs shall have Phi2mm

lead sealing holes.

4 Tests conducted to new containers

4.1 Cold-hot test

4.1.1 The stainless steel containers need to be conducted with cold-hot test

when operating at -196°C. When each batch of containers includes more than

10pcs, SAMPLE the containers accounting for 10% to 20% of the batch quantity

for cold-hot test. If one of the containers is unqualified, INCREASE the sampling

quantity to 40% of the batch quantity. If the non-conformance products still exist,

CONDUCT the cold-hot test to the entire batch of containers. When the batch

quantity is equal to or less than 10pcs, CONDUCT the cold-hot test to each

container.

4.1.2 The method of conducting the cold-hot test to the containers is as follows.

a) During the test, EVACUATE the container until the pressure is lower than

133Pa. After 30min, CHECK whether the pressure meets the

requirements of the vacuum test.

b) PUT the container in the dedicated Dewar bottle. POUR in liquid nitrogen,

so as to cool down the container. The liquid level of liquid nitrogen shall

always submerge the welds of container neck. FREEZE the container for

1h. Naturally THAW to room temperature. HEAT the container to the

maximum allowable temperature according to the provisions of design

drawings. MAINTAIN heating for 1h. Naturally COOL down to room

temperature.

c) The vacuum test for containers shall meet the requirements of Article

4.4.1.

4.2 Pressure (hydraulic/air pressure) test

4.2.1 The requirements for pressure gages and the safety precautions of the

pressure test are as follows.

a) USE two pressure gages that are proven to be qualified along with the

same measuring range for conducting the pressure test;

b) The precision of pressure gages shall not be lower than Level 1.5.

CONDUCT verification within half a year. The appropriate measuring

range shall be 1.5 to 3 times of the test pressure. The dial diameter shall

be greater than 100mm;

c) The safety precautions of the pressure test shall be implemented

according to TSG R0004-2009.

4.2.2 CONDUCT hydrostatic test or air pressure test according to the

requirements of design drawings.

4.2.2.1 The method of hydrostatic test is as follows.

a) The hydrostatic test of containers shall be conducted according to the

Article 8.5.2 of EJ/T 190-1994.

b) After the hydrostatic test, DRAIN the water in the container. USE dried

and degreased compressed air for drying. DRY the container in the

drying oven where the temperature is controlled at 100°C ± 5°C for 24h.

4.2.2.2 The air pressure test of containers shall be conducted according to the

Article 8.5.3 of EJ/T 190-1994.If using nitrogen, the nitrogen shall meet the

requirements of GB/T 3864-1996.

4.3 Gas leakage test

4.3.1 For 740L and 3m3 containers, after the assembly is qualified, CONDUCT

gas leakage test according to the requirements of drawings.

4.3.2 The requirements and methods of the gas leakage test of containers shall

be implemented according to the Article 8.5.4 of EJ/T 190-1994.

4.4 Vacuum test

4.4.1 CONDUCT vacuum test to the containers after the assembly. After the

container assembly is qualified, EVACUATE the containers in time. The leakage

rate shall meet the requirements of drawings or the provisions in Table 5 of EJ/T

190-1994.The time for the inner surfaces of containers to contact with the

atmosphere shall not be longer than 24h.

4.4.2 After the vacuum containers are qualified, USE dry nitrogen to seal up the

containers whose shelf life is more than 6 months for safekeeping. The sealing

pressure shall be within the range of 0.05MPa to 0.1MPa (gage pressure). The

quality of nitrogen shall conform to the indicators of first-grade products

6.3.3 For 740L and 3m3 containers, PUNCH lead sealing holes on the square

valve rods and the valve covers of the JF 22 valves. CONDUCT lead sealing to

the above valves. CONDUCT lead sealing when the valves with protective

covers leave the factory.

6.3.4 CONDUCT lead sealing to the container plugs.

6.3.5 Specially ASSIGN someone to manage the lead sealing pliers. The labels

of lead sealing heads shall be traceable.

6.4 Container filing

6.4.1 The container property organizations shall establish the container ledger,

and shall place the manufacturing documents and materials on file.

6.4.2 The container property organizations shall keep the "container turnover

records", so as to circulate together with the containers.

6.4.3 In the process of container turnover, NOTE down the acceptance,

pressure test, cleaning, assembly, passivation, loading abundance, weighing,

and other conditions of the containers i...

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 16 pages — is available in the English PDF.

Referenced standards

Normative references

GB 150

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