GB 36900.1-2018Ductile Cast Iron High Integrity Container for Low-and-Intermediate Level Radioactive Solid Wastes (English PDF)

3.1 high integrity container high integrity container

It means that it can effectively contain the low and medium level radioactive solids contained in it for more than 300 years.

a container for waste. High integrity containers can be made of different materials (eg concrete, ductile iron, high density polyethylene)

Or composite material).

3.2 ductile iron ductile cast iron

It refers to the cast iron in which the iron is spheroidized and inoculated, so that all or most of the graphite is spherical after solidification.

4.1 General safety requirements

4.1.1 High integrity containers can maintain radioactive content for more than 300 years under long-term storage or final disposal conditions.

Inclusive performance.

4.1.2 The structural material of a high-integrity container shall be in accordance with the contents contained therein and the environmental conditions in which it is exposed (eg temperature, humidity,

Corrosive medium, radiation field, sunlight exposure) compatible. If necessary, lining, jacket or coating can be placed inside and outside the container.

The exhaust of the filter.

4.1.3 The structural design of high integrity containers should be considered for ease of handling, stacking and prevention of surface area water.

4.1.4 When used as a transport container, it should also meet the requirements of GB 11806. If necessary, additional shock absorbers can be added.

4.1.5 The design, procurement, manufacturing and other activities of high-integrity containers shall be prepared in accordance with the requirements of GB/T 15219.

Examine the outline and follow it.

4.2 Special safety requirements

4.2.1 Requirements for content

4.2.1.1 The waste contained in the ductile iron container shall be low and medium level radioactive solid waste, waste meeting the final disposal requirements.

The volume of free liquid in the bag should be less than 1% of the volume of solid waste.

4.2.1.2 The contents of the ductile iron container shall also meet the requirements of GB 9132, Classification of Radioactive Waste and other relevant standards.

Claim.

4.2.2 Casting material requirements

4.2.2.1 The selection of ductile iron containers should consider the mechanical properties (such as strength, hardness, ductility, elongation, impact toughness),

Factors such as the use environment and long-term corrosion resistance.

4.2.2.2 The mechanical properties of the casting materials of ductile iron containers shall meet the requirements of Table 1.

Table 1 Mechanical properties of ductile iron

Performance (cast sample)

tensile strength

Rm/MPa

Specified plastic extension

Stretch strength

Elongation

A/%

Brinell hardness 1)

HBW

Minimum impact energy/J (V-shaped notch)

Three sample mean values

(min.) Rp0.2/MPa

(min.)

(min.)

370 240 12 120~175 12 (room temperature 23+/-5°C) 9 (room temperature 23+/-5°C)

Note 1). The hardness index is for reference only and is not used as a material quality control indicator.

4.2.2.3 The graphite form of the casting material is mainly spherical, and the spheroidization level is not lower than the spheroidization level 3 specified in GB/T 9441.

4.2.2.4 The corrosion resistance of casting materials shall meet the requirements of Table A.3 of Appendix A.

4.2.3 Casting requirements

4.2.3.1 The thickness of ductile iron castings used in ductile iron containers shall be not less than 50 mm and not more than.200 mm.

4.2.3.2 Casting defects (such as cracks, cold partitions, shrinkage holes, slag inclusions, etc.) that affect the performance of castings are not allowed.

4.2.3.3 The types, quantities and ranges of defects allowed on the non-machined surface of the casting and inside the casting shall be in accordance with the casting of the ductile iron container.

Design drawings, technical specifications.

4.2.3.4 The surface of the casting and the surface to be machined shall not be repaired by any means such as clogging, welding repair, infiltration, etc.

5.1 Models, specifications and dimensions

5.1.1 Model, specification and size requirements

The type, specification and size of ductile iron containers should be standardized and serialized as much as possible. Recommended number of barrel and box containers

See Appendix B for specifications. Users can use other sizes and sizes of ductile iron containers as needed, but the performance should meet this standard.

Mandatory requirements of the standard.

5.1.2 Appearance quality

The outer part of the ductile iron container shall not have protruding parts that hinder the stacking. The ductile iron container shall be designed and processed into a surface without

The protruding portion is easy to decontaminate and prevents the structure of water collecting and water accumulation.

5.2 Container performance requirements

5.2.1 Operational performance

Operational performance tests shall be carried out on the loading, unloading, lifting or tethering components of ductile iron containers in accordance with the provisions of 6.3.2.

The work shall be trouble free and the components shall be free from damage after the performance test.

5.2.2 Stacking performance

The stacking test or calculation analysis of the ductile iron container shall be carried out in accordance with the provisions of 6.3.3 to verify that the ductile iron container can be full.

The requirements of the full stack code performance, the content should be no missing or diffuse.

5.2.3 Impact resistance

Drop test or calculation analysis of ductile iron containers shall be carried out in accordance with the provisions of 6.3.4 to verify that the ductile iron containers are full

For the impact resistance of the foot, the contents should be free of leakage or dispersion.

5.2.4 Anti-penetration performance

The 1m drop rod test or calculation analysis shall be carried out on the ductile iron container in accordance with the provisions of 6.3.5 to verify that the ductile iron container can

Sufficient to meet the requirements of penetration resistance, the contents should be free of leakage or dispersion.

5.2.5 Waterproof performance

The spheroidal graphite iron container shall be tested for water spray in accordance with the provisions of 6.3.6 to verify its waterproof performance. After the water spray test, the spheroid

The inner surface of the cast iron container should be free of water.

6.1 Casting material performance test method

6.1.1 Sampling

The casting material performance test shall be carried out with the cast test block. The sampling source and sampling quantity are in accordance with Chapter 8 of GB/T 1348-2009.

Relevant requirements, the test results meet the requirements of Section 4.2.2 casting materials as qualified.

6.1.2 Test method

6.1.2.1 Tensile test

Execute according to the provisions of GB/T 228.1.

6.1.2.2 Impact test

The impact test is carried out in accordance with the provisions of GB/T 229.

6.1.2.3 Hardness test

The hardness test is carried out in accordance with the provisions of GB/T 231.1, 231.2 and 231.3.

6.1.2.4 Metallographic test

The metallographic test is carried out in accordance with the provisions of GB/T 9441.

6.1.2.5 Corrosion resistance test

The corrosion resistance test is carried out in accordance with the provisions of Appendix A Test Method for Corrosion Resistance of Ductile Iron.

6.2 Casting inspection method

6.2.1 Geometric dimension and dimensional tolerance test

6.2.1.1 Visual measurement with a universal measuring tool with a precision of 0.5 mm.

6.2.1.2 The geometry and dimensions of the casting shall be in accordance with the provisions of the drawings.

6.2.1.3 The dimensional tolerance of castings shall be in accordance with the provisions of GB/T 6414. If there are special requirements, they can be executed according to the drawings or relevant technical requirements.

Row.

6.2.2 Surface quality inspection

6.2.2.1 The castings shall be cleaned and trimmed according to the requirements of GB/T 1348-2009.

6.2.2.2 Residual requirements for remnant, sticky sand, oxide scale and internal cavity residue of the pouring riser shall comply with the requirements of the design technical specifications.

6.2.2.3 The surface roughness of castings shall comply with the requirements of GB/T 6060.1, or meet the requirements of design drawings or product technical specifications.

6.2.3 Non-destructive testing

The non-destructive testing requirements for castings shall be carried out in accordance with the provisions of Chapter 11.4 of GB/T 1348-2009.

6.3 Container inspection method

6.3.1 Structural dimensions and visual inspection

The dimensions of the structure are measured using a universal measuring tool with an accuracy of 0.5 mm. The appearance of the container is visually inspected and should conform to the design.

Requirements for drawings or product specifications.

6.3.2 Operational performance test

Ductile iron container contains a uniform solid material with a density of 2500kg/m3, with a filling factor of 95%, for the loaded container phase

The closing member was operated for 50 consecutive times.

6.3.3 Stacking test

The ductile iron container contains a uniform solid material with a density of 2500 kg/m3 and a filling factor of 95%. According to GB 11806

The stacking test is carried out and the stacking time is 24h.

6.3.4 Drop test

The ductile iron container contains a uniform solid material with a density of 2500 kg/m3 and a filling factor of 95%. According to GB 11806

It is required to carry out the drop test. The free fall distance of the drop test should meet the test conditions in GB 11806 under normal conditions of transportation.

The rule of the free fall distance of the bag.

6.3.5 1m drop test

The ductile iron container contains a uniform solid material with a density of 2500 kg/m3 and a filling factor of 95%. According to GB 11806

It is stipulated to carry out the penetration test under normal conditions of transportation.

6.3.6 Water spray test

The water spray test was carried out in accordance with the provisions of GB 11806.

7.1 Type test

7.1.1 The sequence of the type test of ductile iron containers shall be carried out item by item according to Table 2. Each test may be carried out on one container.

7.1.2 After the type test of the ductile iron container is qualified, the design of the type test container can be adopted and the same processing worker

The art is officially mass produced.

7.1.3 Type test requirements

When one of the following conditions occurs in the production of ductile iron containers, a type test project shall be carried out.

a) When the new product is put into production trial production;

b) After formal production, if there are major changes in materials, structures and processes;

c) After the product has been discontinued for a long time (more than one year), when the production is resumed;

d) When there is a big difference between the factory inspection result and the type inspection result;

e) When the user request or the national nuclear safety regulatory authority proposes that type inspection is required.

Table 2 Type test items

Serial number test item

7.2 Factory inspection

7.2.1 The performance of the ductile iron container product shall meet the requirements of Chapter 5, and the structural dimensions and appearance inspection of the container shall be carried out one by one.

The station performs non-destructive testing. Each batch of the same specification product is pumped 10% (at least one) for performance testing.

7.2.2 After passing the inspection, work cards, material certificates, product inspection reports and containers shall be issued for each ductile iron container.

Certificate of conformity.

7.3 Decision rules

7.3.1 Type test judgment rules

If all the tests are qualified, the inspection batch is judged to be qualified. If one item fails, the inspection lot is judged to be unqualified.

7.3.2 Factory inspection judgment rules

If all the tests are qualified, the inspection batch is judged to be qualified. If one item fails, the inspection lot is judged to be unqualified.

9.1 Product storage

9.1.1 Ductile iron containers should be stored on the foundation of the foundation. It should be placed vertically. The height of the stack should not exceed 6 layers.

9.1.2 Ductile iron containers shall be protected from chemical attack, harsh weather and external forces during storage.

9.2 Product Transportation

9.2.1 Ductile iron containers must be lightly handled by lifting tools when handling, loading and unloading. Appropriate measures should be taken when transporting,

Fasten the ductile iron container to the transport and set the appropriate cushioning or isolation space between the ductile iron containers.

Material or device to prevent collision and damage.

Appendix A

(normative appendix)

Method for detecting corrosion resistance of ductile iron

A1 Scope

The method provides spheroidal cast iron corrosion test equipment for spheroidal graphite cast iron high integrity container, sample preparation and requirements, test

Solutions, test procedures, test results and evaluations.

The method is applicable to the determination of the corrosion rate of nodular cast iron in simulated acidic aqueous solution and simulated soil addition aqueous solution.

A2 test equipment

A 2.1 constant temperature water bath

The temperature range is from 20 °C to 100 °C, and the temperature control accuracy is +/-2 °C.

A 2.2 Test container

For 2L glass beakers, other containers made of materials that are inert at the test temperature can also be used.

A3 sample

A 3.1 sample material

The test material was ductile iron with mechanical properties meeting the requirements of Table 1.

A 3.2 Sample size and quantity

A 3.2.1 The size of the test sample is 50mm x 25mm x (3 ~ 5) mm, the number of parallel samples is not less than 3, blank pair

At least one sample than the sample.

A 3.3 Sample preparation

The sample shall be cut on the casting and mechanically or chemically removed to remove the scale on the surface of the sample and machined to

For dimensional requirements, it is recommended that the surface roughness Ra of the sample be in the range of 6.3 µm to 12.5 µm. 800 before the test using GB/T 2481.1

Grinding water sandpaper, cleaned, dried and stored in the dryer for not less than 24h.

A4 test solution

A 4.1 Prepare the solution using chemically pure and above grade chemicals and deionized or distilled water. The prepared test solution should be charged

Stir and stabilize.

A 4.2 The test solution is selected from the acidic aqueous solution simulated in Table A.1 and the soil aqueous solution simulated in Table A.2.

Table A.1 Simulated acidic aqueous solution (pH=3~4)

Ingredient content, mg.L-1 content, mg.L-1

Calcium Sulfate (CaSO4) 2.72 Sodium Carbonate (Na2CO3) 109.18

Sodium chloride (NaCl) 84.80 Sodium sulfate (Na2SO4) 38.34

Sodium bicarbonate (NaHCO3) 281.40 magnesium sulfate (MgSO4) 1.20

Note. The pH of the solution can be adjusted with a 50% H2SO4 solution.

Table A.2 Simulated soil addition solution (pH=7～8)

Ingredient content, mg.L-1 content, mg.L-1

Calcium sulfate (CaSO4) 13498.00 Ferric sulfate (Fe2(SO4)3) 1.80

Sodium Chloride (NaCl) 14077.44 Ammonium Bicarbonate (NH4HCO3) 17.38

Sodium bicarbonate (NaHCO3) 294.00 Potassium hydrogencarbonate (KHCO3) 308.00

Sodium carbonate (Na2CO3) 26.50 Potassium chloride (KCl) 5822.18

Sodium sulfate (Na2SO4) 127.80 Calcium chloride (CaCl2) 3883.89

Magnesium sulfate (MgSO4) 493.23 - -

A5 test procedure

A 5.1 Measure the mass and size of the sample before the test, the quality is accurate to 0.0001g, the size is accurate to 0.02mm, and the calculation is completed.

Sample area.

A 5.2 Stir the test solution and pour it into a glass beaker or other container that meets the test requirements. The surface per square centimeter of the sample

The amount of test solution required for the product should be above 20 mL.

A 5.3 Heat the test vessel to a specified temperature in a constant temperature water bath. The test temperature is room temperature (25 °C +/- 2 °C) or high temperature (90 °C).

+/-2 ° C).

A 5.4 Place the sample into the test solution. Each sample should not touch each other, keep a certain distance, and do not touch the beaker. test

The solution level should be at least 2 cm above the top of the sample.

A 5.5 The test solution should be replaced every 7 days during the test. Test at high temperature (90 ° C +/- 2 ° C) to prevent steaming of the solution

The test vessel shall be provided with means for recirculating condensation.

A 5.6 Test duration is recommended to be at least 90d at room temperature (25 °C +/- 2 °C); at least 30d at high temperature (90 °C +/- 2 °C).

A 5.7 After the test is completed, the sample is taken out, washed with flowing deionized water, washed and then dried for use. Should avoid as much as possible in the process

Free or reduce the shedding of corrosion products.

A6 Test results evaluation

A 6.1 Appearance

A 6.1.1 Visually inspect the appearance of the sample after corrosion under daylight or artificial scatter lamp, record the surface corrosion distribution and corrosion

The color of the product.

A 6.1.2 After removing the corrosion products on the surface of the sample according to the method specified in GB/T 16545, under the sunlight or artificial scattering lamp

Depending on the appearance of the sample after corrosion, the type of corrosion (uniform corrosion/local corrosion) was recorded.

A 6.1.3 Measure the roughness of the surface of the sample after de-corrosion of the product and compare it with the blank sample.

A 6.1.4 If local corrosion occurs, the corrosion depth and corrosion area of the sample after de-corrosion are detected.

A 6.2 Corrosion rate

Calculate the corrosion rate according to formula (A.1).

1 28.76 10 ( )WW

S t

     (A.1)

In the formula.

v - corrosion rate in microns per year (µm/a);

W1 - mass of the sample before corrosion, in grams (g), accuracy to 0.0001g;

W2 - mass of the sample after corrosion, in grams (g), accuracy to 0.0001g;

S - surface area of the sample in square centimeters (cm2);

rho - ductile iron density in grams per cubic centimeter (g/cm3);

t - duration of the test in hours (h).

A 6.3 Qualification criteria

Used to make high integrity containers with du...