ML19340A895
| ML19340A895 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 03/13/1964 |
| From: | Bryan R US ATOMIC ENERGY COMMISSION (AEC) |
| To: | |
| Shared Package | |
| ML19340A893 | List: |
| References | |
| NUDOCS 8009050622 | |
| Download: ML19340A895 (2) | |
Text
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HAZARDS ANA!.YSIS BY Tile RESEARC!! AND POWER REALTOR SAFETY BRANOf w
DIVISION OF LICENSING AND REGULATION IN Tile MATTER OF COMMONWEALTH EDISON COMPANY PROPOSED OIANGE NO. 6 - MINIMUM BURNOUT RATIO Int roduction Commonwealth Edison Company, by application dated September 17, 1963, requested i
authorization to lower the operating limit on the burnout ratio from 2.0 to 1.5.
This change, which was considered by the staff pursuant to the provisions of Section 50.59, of 10 CFR 50, has been designated Proposed Change No. 6.
An additional request, to increase the maximum allowable steady state heat flux limits, also requested in the letter of September 17, is not considered in this analysis.
B,,ack g round The previously accepted minimum burnout ratio of 2.0 for the Dresden reactor was based on sa intermediate correlation prepared by the General Electric Company.
Use of a new GE correlation, outlined in APED 3892, was authorized.
by the Commission by letter dated.luly 5,1962. This burnout correlation is also being used at the Big Rock Point and Humboldt Bay reactors. The bun rout ratio limit for Big Rock is presently 1.5, and this limit has been utilized for Humboldt Bay, i
ga,lgi s A minimum burnout ratio of 2.0 was considered acceptable for the Dresden reactor utilizing the previous burnout correlation. The new correlation, j
APED 3892, contains considerably more data than the original correlation, t
The cortclation lines are drawn below essentially all the existing data points, which provides a factor of consersatism.
In our opinion, the new correlation is sufficiently conservative and is based on enough experimental i
data that, for use in calculating thermal margins for this reactor, an associated burnout ratio limit of 1.5 is acceptable for this facility.
Lech,ni, cal, Spcci fications Accordingly, we believe that thevalue of the minimum burnout ratio stated in Section D-3 of the Technical Specifications to License DPR-2 should be changed from 2.0 to 1.5, evaluated at 125 percent of rated power.
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Conclusion y
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Based upon our review of the information submitted, we have concluded that
. Change No. 6 does not involve significant hazards consi< erations not described or implicit in the hazards. summary report and that there is reasonable assurance that the health and safety of the public will not be endangered.
i Original signed a
by Rcbert H. Bryan Robert H. Bryan, Chief i
Research and Power Reactor Safety Branch Division of Licensing and Regulation Date:
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