ML20247Q214
| ML20247Q214 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 09/21/1989 |
| From: | William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-86-16, TXX-89695, NUDOCS 8909280135 | |
| Download: ML20247Q214 (2) | |
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Log # TXX-89695 File # 915.6
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nlELECTRIC September 21, 1989 W.J.Cahul
' Encutive Vice President.
U. S. Ntelear Regulatory Commission Attn: Document Control Desk Washington, D. C.
20555
SUBJECT:
CCMANCHE PEAK. STEAM ELECTRIC STATION (CPSES)
DL",KET NOS. 50-445 AND 50-446 ANh9AL REPORT OF CHANGES IN PEAK CLADDING TEMPERATURES
. Gentlemen:
This letter is TU Electric's annual report of changes or errors discovered in the ECCS calculations of peak cladding temperatures (PCT) as required by 10CFR50.46(a)(3)(ii). This report includes all-such changes / errors that necessitated a re-evaluation of the peak fuel cladding temperature subsequent to the filing of Amendment 6 of the CPSES FSAR (on May 31, 1979), which is the latest PCT of record, i.e., 2010.70F.
For Unit 1, each instance-is identified below along with W resultant cladding temperature change.
Item Chance in PCT (OF)
Steam generator bypass flow modification 6.2 (increased hot leg temperature)
Modification of accumulator water level 10 (reduced volume)
Reduced RHR flow due to mini-flow operation 1
Allowance for WREFLOOD errors per NRC 12 Generic Letter 86-16 (6 to 120F)
Accommodation for 1% steam generator tube 6
plugging Correction of error in steam generator flow area 12.6 Total Change 47.8 l
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to r4 4t@ North Olive Street LB 81 Dallas, Texas 75201
TXX-89695 September 21, 1989 Page 2 of 2 Based on the above list of changes in the Unit 1 PCT, the new value is 2058.50F, which remains well below the 22000F limiting value established by Part 50.46(b)(1).
With regard to changes in the PCT for Unit 2 TU Electric made the decision to change to an optimized fuel design as related to the staff during discussions concerning Generic Letter 86-16.
Using the 1981 Westinghouse ECCS model, the PCT was calculated to be 18080F. As the results cf re-evaluations become available, they.will be provided in the applicable annual report.
If you have any questions on this matter, please contact either Messrs.
Whee Choe or Ray Ashley of my staff, at (214) 812-4371 and 812-8415, respectively.
Sincerely, e
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William J. C ill, Jr.
RLA/smp c - Mr. R. D. Martin, Region IV Resident Inspectors, CPSES (3)
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