ML19242A136
| ML19242A136 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 07/26/1979 |
| From: | Bossenmaier W SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7907310352 | |
| Download: ML19242A136 (2) | |
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(i SMUD SACRAMENTO MUNICIPAL UTILITY DISTRICT C 6201 s street, Box 15830, sacramento. Cahfernia 95813. (916 452 3211 July 26, 1979 Mr. Harold R. Denton Director Office of Nuclear Reactor Regulation USNRC Washington, D.C.
20555 Docket No. 50-312 Rancho Seco Nuclear Generating Statica, Unit No. 1
Dear Mr. Denton:
The Sacramento Municipal Utility District hereby submits infornation on long term modifications to Rancho Seco Nuclear Generating Station as required by your letter ei June 27,1979.
Also included is required small break nodel informatior In their May 7,1979 Order, the Nuclear Regulatory Commission listed four long term modifications which w7re proposed in the District's April 27, 1979 letter.
The status of thost four long term items follows:
Auxiliary Feedwater Syj; tem Upgrade - The District carefully reviewed Auxiliary feedwater Systea uparating procedures and verified that system design requirements are satisfied.
The system was modified to improve both system flow indication and actuation information in he control room.
The District will continue to review the design of the Auxillary Feedwater System and if additional analysis or system enhancemnnts are required, they will be made.
Inteq ated Control Systems Failure Modes and Effects Analysis -
The District is currently reviewing a draf t report of the failure modes and effects analysis.
The review will be complete by July 27, 1979 and returned to Babcock and Wilcox.
Babcock and Wilcox expects to submit the final report to the Nuclear Regulatory Commission Staff during the week of July 30, 1979.
Safety Grade Anticipatory Trips _ - In its May 21, 1979 response to Inspection and Enforcement Bulletin No.79-05B, the District submitted conceptual design drawings for upgrade of existing anticipatory trips f rom control grade to safety grade.
Upon approval of the conceptual design by the Nuclear Regulatory Cornission Staf f, detailed design drawings will be submitted within three months.
Upon approvai of detailed design by the Nuclear 79ulatory Commission Smrf, hardware procurement can be complete within 9 months.
The hardware will be installed at the next refueling after arrival, yya f6[L JL" l
7 90'7 3103F2g
Mr. Harold R. Denton July 26,1979
_ Operator Training - All Rancho Seco Nuclear i anerating Stat'on licensed operators (5 reactor operators and 1' senior reactor operators) have completed TMI-2 related train og on the B&W simulator at Lynchburg, Virginia.
The final cperator completed training on June 21, 1979.
The District's May 14, 1979 response to the May 7,1979 Nuclear Regulatory Comission Order details the extensive training program.
The May 7,1979 Nuclear Regulatory Commission Order also required information on the model used in analysis of potential small b rea ks.
Model description is included in the analysis titled " Evaluation of Transient Behavior and Small Break in the 177 Fuel Assembly Plant" submitted by Babcock and Wilcox to the NRC staff on May 7, 1979.
The analysis was for mally transmitted by the B&W letter of May 8,1979 (Taylor to Mattson).
Additional model information will be submitted by Septenbar 15, 1979.
Sincerely yours, J
W. S. Bossenmaier Acting Generai Manager 7 -) 7
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