ML20040G712
| ML20040G712 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 02/04/1982 |
| From: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20040G713 | List: |
| References | |
| NUDOCS 8202160394 | |
| Download: ML20040G712 (2) | |
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SMUD SACRAMENTO MUNICIPAL UTILITY DISTRICT O 6201 S Street, Box 15830, Sacramento, California 95813; (916) 452 3211 February 4, 1982 e
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O DIRECTOR OF NUCLEAR REACTOR REGULATION fiECEWgg ATTENTION JOHN F STOLZ CHIEF o
OPERATING REACTORS BRANCH 4 D
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WASHINGTON D C 20555 b
DOCKET 50-312 N
RANCHO SECO NUCLEAR GENERATING STATION
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UNIT NO 1 HIGH PRESSURE INJECTION N0ZZLE CYCLES Your letter of February 3, 1982 requesting additional information concerning the high pressure injection nozzle cycle analysis was received by the Sacra-mento Municipal Utility District today. As discussed in our letter to you, also dated yesterday, February 3, 1982, the District will provide the infor-mation requested in the enclosure to your letter by July 1, 1982.
It should be noted, however, as discussed during telephone conversations over the last two months, that the stresses used to revise our allowable high pressure injec-tion nozzle cycle usage were extracted from the original Rancho Seco stress report. Since these calculations were performed with old computer codes dating back approximately twelve years, the sample calculations may not be available, since the codes have been modified over the intervening years.
If this is the case, explanations of the calculations will be provided.
In the body of your letter, you requested an analysis to support the conclusion that no additional cycling is occurring on the normal makeup nozzle, as a result of our procedures which direct the operator to direct high pressure injection water, if manually initiated, to the normal makeup nozzle.
Such an analysis has not been performed, and is not necessary since this flow increase does not involve a change in water temperature and therefore does not thermally cycle the makeup nozzle. The makeup nozzle is provided with a thermal sleeve to reduce the effects of any thermal cycles even if they should occur.
It should be noted that the table of operating transient cycles provided in our December 11, 1981 response to the Atomic Safety & Licensing Appeal Board's memoraadum and order, ALAB-655, l
shows that many thousands of flow perturbations, with and without temperture changes, were assumed to occur in the makeup nozzle as a basis for the original stress analysis.
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JOHN F STOLZ
- 2J-February 4, 1982 i
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- Also, as requested in the body of your, letter, Rancho;Seco Administrative 1
Procedure No. 17, " Logging of Operational Transients" is attached-for your review.
l I
John J. Mattimoe I
Assistant General Manager 1
and Chief Engineer 4-
~ Attachment i
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cc: Tom Baxter - Shaw, Pittman, Potts, & Trowbridge Dave Holt - Babcock & Wilcox Mark Padovan - NRC l
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