ML20044B595
| ML20044B595 | |
| Person / Time | |
|---|---|
| Site: | 05200002 |
| Issue date: | 01/07/1993 |
| From: | Rosalyn Jones Office of Nuclear Reactor Regulation |
| To: | Toelle S ABB COMBUSTION ENGINEERING NUCLEAR FUEL (FORMERLY |
| References | |
| TAC-M79067, NUDOCS 9301130167 | |
| Download: ML20044B595 (2) | |
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January 7, 1993 S. A. Toelle, Manager Nuclear Licensing ABB Combustion Engineering, Inc.
1000 Prospect Hill Road P. O. Box 500 Windsor, Connecticut 06095-0500
Subject:
Request for Additional Information on Topical Report CENPD-382-P,
" Methodology for Core Designs Containing Erbium Burnable Absorbers" (TAC No. M79067)
Dear Mr. Toelle:
i The review of topical report CENPD-382-P is currently in progress. During the course of our review, the staff has identified the need for some additional information as indicated in the enclosure.
Please contact E. D. Kendrick of my staff on (301) 504-2891 if there are any questions concerning this request.
~ incerely, a
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Fctmtn Robert d.. % Jones, Chief Reactor Systems Branch Office of Nuclear Reactor Regulation
Enclosure:
As stated 1
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1 QUESTIONS ON ABB COMBUSTION ENGINEERING NUCLEAR POWER'S TOPICAL REPORT l
" METHODOLOGY FOR CORE DESIGNS CONTAINING ERBIUM BURNABLE ABSORBERS" (CENPD-382-P)
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i 1.
The subject topical report has indicated that erbia particle size is an important fabrication parameter.
Please provide the fabrication i
specification on erbia particle size for the erbium bearing U0 f Please discuss in detail how a) the maximum particle size was be uel.
l termined, b) the confidence limits at which the maximum particle size is j
maintained based on testing during fabrication, and c) why this maximum particle size is acceptable.
l melt temperature limit for erbium bearing U0 fuel l
The use of the U0,for melting for this application as compared to the j
2.
7 lowers the margin margin for U0, fuel.
Please discuss why this is acceptable. Please i
provide a lower bound melt temperature limit (at a 95% confidence level) for erbium bearing 00, fuel as a function of erbia content.
3.
Please provide a comparison of the previous UO (0% erbia) thermal I
conductivity relationship as a function of tem,perature to that relation-ship altered to fit the'erbia data.
j ii 4.
The description of the computer analysis (Pages 3-1 to 3-3) does not mention whether credit is taken for the addithe-flux depression and altered radial power distribution (within the fuel pellet) caused by the erbia addition.
If such credit is taken, it should be described;'if not, this should be stated.
5.
The time dependent power histories are not provided for the various calculations presented, even'though most other fuel performance computer code input is provided.
Please provide these power histories and associated axial power profiles and any other input information (e.g.,
fuel densification assumed) that may be needed to perform independent
}
audit calculations, j
i 6.
A discussion is provided in Pages 3-10 through 3-12 that attempts to convince the reader that the erbium bearing U0 fuel rods will not i
actuallybelimitingandwillnotlimitcurrenkcoreoperation.
However, Section 3.2.5 on Page 3-11, indicates that cycle specific analyses for both U0, and erbium bearing fuel, i.e., for rod pressure and centerline melting, will be used to determine operational limits.
Is this iaterpretation that cycle specific analyses will be performed for both 00 and erbium bearing fuel correct?
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