Classification of RAW in South Africa

The RAW classification scheme as applicable to Necsa is generally in com­pliance with the scheme as published in the NRWMPS [3] . The proposed scheme for Necsa also makes provision for the latest IAEA international developments in RAW classification [4]. More waste classes are covered to address all the various waste streams of Necsa (e. g., special waste). The additional waste classes could be regarded as sub-classes of the main classes [3] which facilitate effective waste management and are complementary to the management methodology. The latest waste classification guidelines [4] are based on long-term safety aspects and do not specify criteria to distin­guish between the classes. For the Necsa classification scheme, some criteria are maintained in view of the following: [33]

High-level waste (HLW)

Ё

CO

Ф

§

"O

Ф

о

-C

СЛ

Intermediate-level waste (ILW)

Low-level waste (LLW)

Very low-level waste (VLLW)

Exempt waste (EW)

~тг

100 days

~T 31 years

a < 400 Bq/g &

< 4000 Bq/g ^(Юх higher per package)

^100 x clearance 1 levels

r Clearance levels

Decay periods

20.6 Solid radioactive waste classification system.

Table 20.1 Waste classification scheme

Waste class National waste classification scheme [3] at Necsa

1. HLW

1.

HLW

2. ILW

2.

LILW-LL

3. LLW

3.

LILW-SL

4. VLLW

4.

VLLW

5. EW

5.

VLLW (exempt waste included in definition)

6. VSLW

6.

Not included as waste class. Covered as waste treatment to reach exemption levels

The Necsa solid radioactive waste classification system is presented sche­matically in Fig. 20.6. The classification scheme also complies with the general classification scheme as indicated in Table 20.1.

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