ML19309A327
| ML19309A327 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 02/26/1974 |
| From: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8003270757 | |
| Download: ML19309A327 (4) | |
Text
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AEC DISTP'UTION FOR PART 50 DOCKET MATER" 1
1677 (TEMPORARY FORM)
CONTROL NO:
c FILE:
FROM:
DATE OF DOC DATE REC'D LTR IEMO RPT OTHER peranento Municipal Utility District beramento, Calif. 95813
- 7. J..T. !?attimoe 2-26-74 2-28-74 X
TO:
ORIG CC OTHER SENT AEC PDR XXX SENT LOCAL PDR XXX Giambusso 1 signed 0
CLASS UNCLASS PROP INFO INPUT NO CYS REC'D DOCKET NO:
XXX 1
50-312 DESCRIPTION:
ENCLOSURES:
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SPECIFIC HEAT OF UO 2 (1 cy en enc 1 rec'd)
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SACRAMENTO MUNICIPAL UTILITY DISTRICT C) 6201 S Street, Box 15830, Sacramento, California 95813; (916) 452-3211 February 26. 1974 Mr. Angelo Giambusso db Deputy Director for Reactor Projects F u N, ~4 t Directorate of Licensing
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AEC Docket No. 50-312 N
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Rancho Seco Nuclear Generating
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S tation, Unit No.1
Dear Mr. Giambusso:
In the District's letter of January 22, 1974, you were notified that B&W was revising the specific heat curve for UO2 fuel as utilized in some of its transient computer codes for plant safety analyses. This revision was expected to increase the values for specific heat at elevated temperatures.
A new specific heat curve has now been issued, following appropriate quality assurance and approval steps, and incorporated into the affected transient codes. The new specific heat curve is attached.
The safety implications of higher values of specific heat were investigated specifically for TMI-1, ANO and Oconee 3 by rerunning the various transients. Although all of the analysis on Rancho Seco Unit 1 have not been completed as this time, it is expected that the results will be comparable to those described in this transmittal. The slower transients were unaffected. The more rapid transients were investigated with the
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following results:
l.
Rod Ejection Transient:
The DNBR was not noticeably affected. The aaxiuum cladding temperature decreased by 70*F to 100*F and the maximum fuel temperature decreased by 200*F to 300*F.
2.
Locked Rotor Transient:
The DNBR was not noticeably affected. The maximum cladding temperature increased by 5'F to 15'F and the fuel temperatures j
fell off at a slower rate. The overall effect of this change is insignificant.
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Four-Pump Coastdown Transient:
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.A The increased specific heat values had no significant a
MAR 5 1974 effect on this transient.
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Mr. Angelo Giambusso February 26, 1974 4.
ECCS Analysis:
The only significant ' impact the specific heat revision has on safety limits is the lowering of some portions of the allowable linear heat rate by up to 0.65 kW/ft.
This LOCA-derived curve determines the allowable linear heat rate as a function of elevation in the core for which the Interim Acceptance Criteria are met.
Revised LOCA limits were determined by repeating the Oconee 2 calculations because these analyses are representative of the 177 fuel assembly plants. The allowable heat rate curve on Oconee -2 is lower by 0.65kW/ft. at the 6-foot elevation but is unchanged at the 10-foot elevation. The revised LOCA limit curve is attached.
It is expected that the SMUD LOCA limit curve would be lowered by a similar amount.
5.
Reactor Building Pressure:
The initial stored energy in the core is increased by less than one million BTUs; calculation of the reactor building pressure shows no change.
A reanalysis of TMI-1, ANO and Oconee 3 operating margins with respect to the revised LOCA limit curve was performed based on the procedures developed in BAW-10078.
In order to ensure that SMUD, in addition to TMI-1, ANO, and Oconee 3, operate within the revised IDCA limit and more accurately reflect the operating characteristics of Oconee 1 and 2 experience to date, similar analyses will be made for SMUD and revised Technical Specifications taill be submitted in the first week in April 1974.
Sincerely yours,
.h J. J. Mattimoe Assistant General Manager and Chief Engineer Attach:3entdi i
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