ML19290E238
| ML19290E238 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 02/27/1980 |
| From: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8003050518 | |
| Download: ML19290E238 (2) | |
Text
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c) SACRAMENTO MUNICIPAL UTILITY DISTRICT C 6201 S suun
~~
95813; (916) 452-3211 Feb rua ry 27, 1980 Director of Nuclear Reactor Regulaticn Attention:
Mr. Robert W. Reid, Chief Operating Reactors, Branch 4 U.S. Nuclear Regulatory Cornission Washington, D.C. 20555 Docket 50-312 Rancho Seco Nuclear Generating Station, Unit 1 Additional Information Cycle 4 Reload
Dear Mr. Reid:
In your letter of February 11, 1980, you reouested additional information on Rancho Seco, Unit 1, Cycle a reload.
The District provided answers to these ouestions in its lettet of February 19, 1980.
After additional discussions with the staff, the District wishes to revise its response to Question 1 to read as shown in tha attachment.
' Respectfully submitted, tht Y M w
VJohn. Mattimce Assistant General Manager and Chief Engineer Attachnent Aool Slll v7 8003050 0
ATTACPMENT 1 Revision to Question 1 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION RANCHO SECO UNIT 1 CYCLE 4 RELOAD REPORT BAW-1560 1.
Question:
The current power distribution reliability factor, RF, shown in BAW 10119 is based on comparisons of measured and predicted power distributions of cores utilizing conventional three batch, out-in, fuel management schemes.
An in-out-in fuel management scheme has been proposed for cycle 4 Hence the current RF is not, without analysis, applicable to cycle 4 To support the use of the current RF, confirmatory analyses should be proposed. Specifically, a statistical test and acceptance criteria should be proposed which will test the hypothesis that Rancho Seco cyle a comparisons of measured and predicted power districutions are members of the family of comparisons which form the data base for the current reliability factor.
Such comparisons and statistical testing should be made on at least a morably interval and a running tally maintained throughout the cycle.
Results of these tests need not be reported if acceptance criteria a re me t.
Resoonse:
The District agrees to provide a comparison between measured and calculated power distribution at time points which closely correspond to the data available from design calculations. That is, the power distribution will be measured at beginning of cycle,25, 50, and each 50 full-power days thereafter, including an additional point near end of cycle.
The comparison will provide a calculation of the RMS difference in relative power density between the measured and calculated values for the 52 instrumented assemblies.
The results of the comparison will be included in monthly recorts.