2019 ⦽ǎႊᔍᖒ⠱ʑྜྷ⦺⫭ ⇹ĥ⦺ᚁݡ⫭ םྙ᧞Ḳ
351
Evaluation of CH3I Removal Performance and Physical Characteristics
for New TEDA Impregnated Activated Carbon Stored in Nuclear Power Plants
Hak-Soo Kim* and Cho-Rong Kim
KHNP Central Research Institute, 70, Yuseong-daero 1312beon-gil, Yuseong-gu, Daejeon, Republic of Korea *[email protected]
1. Introduction
Air Cleaning Unit (ACU) in Nuclear Power Plant (NPP) is adopted to remove radioactive waste as well as toxic materials from operation and accidents. Absorber in ACU is filled with Tri-Ethylene-Di-Amine impregnated activated carbon (TEDA-AC) and has been chosen as an absorbent to remove the radioiodine during normal operation and accident conditions. The CH3I removal performance of
TEDA-AC is affected by the environment factors such as temperature, humidity and toxic materials and should satisfy Regulatory Guide 1.52 for Safety-Related-System and Regulatory Guide 1.140 for Non-Safety-Related-System. But there are only quality assurance requirements for packaging, storage and handling for new TEDA-AC in storage [1]. The performance of new TEDA-AC may be deteriorated due to the environment conditions in storage areas. In this paper, the analysis results of CH3I removal performance, physical characteristics
and TEDA loss for new TEDA-AC according to the storage period are introduced.
2. Representative Sample Selection and
TEDA-AC Storage Conditions
In order to evaluate the CH3I removal performance,
physical characteristics and TEDA loss of new TEDA-AC under storage, representative samples
were selected according to storage period. Table 1 shows the storage period for new TEDA-AC.
Table 1. Storage Period for New TEDA-AC
NPP Purchase Date Sampling Date Storage Period NPP 1 2016-07 2017-06 < 1 year (11 months) NPP 2 2012-04 2017-03 < 5 year (59 months) NPP 3 2011-06 2017-07 > 5year (73 months)
The new TEDA-AC in NPP is packed and stored in according with Level 2 requirements of ASME NQA-1-2015, Subpart 2.2 [1]. The new TEDA-AC is sealed in vinyl and then stored in a sealed drum as shown in Fig. 1.
Fig. 1. Packaging Status of New TEDA-AC.
3. Analysis Results of New TEDA-AC
The CH3I removal performance of new TEDA-AC
was tested according to ASTM D3803-91 [2]. The results are shown in Table 2.
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2019 ⦽ǎႊᔍᖒ⠱ʑྜྷ⦺⫭⇹ĥ⦺ᚁݡ⫭םྙ᧞Ḳ Table 2. Analysis Results of CH3I Removal PerformanceNPP Samples Results
NPP 1 < 1 year (11 months) 99.785±0.07
NPP 2 < 5 year (59 months) 99.885±0.004
NPP 3 > 5year (73 months) 99.821±0.007
The physical characteristics of new TEDA-AC was analyzed according to ASME AG-1-2015 FF-5120 [3] and its results are shown in Table 3.
Table 3. Analysis Results of Physical Characteristics
Test Items Method Criteria Results < 1 year < 5 year > 5 year Apparent Density D2854 Min. 0.38 g/ຸ 0.57 0.54 0.57 Particle Size Distribution
D2862 Passed Passed Passed ASME E-11 Sieves
-retained on No.6 Max. 0.1% -retained on No.8 Max. 5.0% -No.8 retained on No.12 Max. 60.0% -No.12 retained on No.16 Min. 40.0% -through No.16 Max. 5.0% -through No.18 Max. 1.0%
Moisture Content D2867 Measured 2.3 2.9 3.8 ball-pan hardness D3802 Min. 60.0% 99.6 99.7 99.8
pH D3838 Measured 10.1 10.1 9.7
ACU in NPP use activated carbon with 5% TEDA-AC to remove the radioiodine. It was additionally analyzed whether TEDA loss occurred according to storage period. TEDA loss analysis was performed using a thermal analyzer system and the results of TEDA loss are shown in Fig. 2.
( < 1 year)
( < 5 year)
(> 5 year)
Fig. 2. Analysis Results of TEDA Loss.
4. Conclusion
The new TEDA-AC is stored in warehouse for long-term periods before being installed in ACU. The results of the analysis showed that there was no significant change in the CH3I removal performance
and physical characteristics of new TEDA-AC after long-term storage.
REFERENCES
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[2] ASTM, ³6WDQGDUG7HVW0HWKRGIRU1XFOHDU-Grade $FWLYDWHG&DUERQ´$670'-91, 2014. [3] ASME, ³&RGHRQ1XFOHDU$LUDQG*DV7UHDWPHQW
Article FF-,QVSHFWLRQDQG7HVWLQJ´$60( AG-1-2015, 2015.
