Economic Analysis Regarding the Introduction of a CANFLEX-NU Fuel Into Wolsong Units
Bibliographic record
Abstract
A CANDU core is composed of lots of fuel channels of a pressure tube type which creates an independent flow passage different from that of a LWR. Hence, most of the aging effects for a CANDU’s operating performance originate from a crept pressure tube as its operating years proceed. Since the early 1990’s, Korea Atomic Energy Research Institute (KAERI) and Atomic Energy of Canada Limited (AECL) have cooperated to develop, verify, and demonstrate an advanced CANDU fuel, called a CANFLEX-NU (CANdu FLEXible-Natural Uranium) fuel, which has been specially designed so as to compensate for a deterioration of the heat transfer rate in a crept pressure tube and also to enhance the safety margin of it by a reduction of the maximum linear element power of a fuel bundle. Now, a CANFLEX-NU fuel is ready to be commercialized in a CANDU-6 because its design and demonstration irradiation have been completed in both of Korea and Canada. Recently, some CANDU plants are being refurbished as they are approaching their life time. One of the refurbished CANDU’s is Wolsong Unit 1 in Korea. It has been operated for 25 years and the operating power at the present time is less than 90% of a full power because of a reduction of the margin for the ROP trip set point. The most appropriate way, up-to now, to overcome such a power de-rating due to a crept pressure tube is the introduction of a CANFLEX-NU fuel into a CANDU. Before commercializing a CANFLEX-NU fuel in the Wolsong Units, it was required to estimate the economic benefit analysis for a CANFLEX-NU fuel in the Wolsong Units because the Uranium price at present is very different from that during the development phase of the CANFLEX-NU fuel. The present paper proposes an economic evaluation model for a CANFLEX-NU fuel in the Wolsong Units and its result for a CANFLEX-NU fuel are compared with that for a 37-element fuel. It was found that the introduction of a CANFLEX-NU fuel into the Wolsong units would have economical benefits due to a better operating performance even where it is assumed that the fuel fabrication cost of a CANFLEX-NU fuel is 1.4 times that of a 37-element fuel. Once the final results are obtained, they will be used as one of important parameters to determine the introduction of a CANFLEX-NU fuel in the Wolsong Units, or not.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".