ML20024D235
| ML20024D235 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 07/22/1983 |
| From: | Reinaldo Rodriguez SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20024D236 | List: |
| References | |
| RJR-83-542, TAC-52605, NUDOCS 8308030353 | |
| Download: ML20024D235 (4) | |
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'~' SACRAMENT 0 MUNICIPAL UllLITY DISTRICT O 6201 S street, P.O. Box 15830. Sacramento, CA 95813; (916) 452-3211 AN ELECTRIC SYSTEM sERvlNG THE HEART OF CAllFoRNIA RJR 83-542 July 22,1983 DIRECTOR OF NUCLEAR REACTOR REGULATION ATTN: DARRELL G EISENHUT, DIRECTOR DIVISION OF LICENSING U S NUCLEAR REGULATORY COMMISSION WASHINGTON DC 20555 DOCKET N0. 50-312 LICENSE NO. DPR-54 PROPOSED AMENDMENT NO. 97 In accordance with 10CFR50.59, the Sacramento Municipal Utility District hereby proposes to amend its Operating License DPR-54 for Rancha Seco Nuclear Generating Station, Vait No.1.
Enclosed are forty (40) copies of this prooosal entitled Proposal Amendnent Number 97.
The purpose of this proposed amendment is to correct Table 4.1-1, Instru-ment Surveillance Requirements, item 48.a and 48.b, to show the proper sequence of Instrument Checks and Instrument Tests. to this submittal is the No Significant Hazards Consideration Evaluation.
The District has determined that this proposal is a Class II Amendment in that it has no safety or environmental significance. A check for $1,200 is enclosed.
I you have any questions, please contact Mr. Ron Colombo at the Rancho ec N lear Generating Station.
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R. J. Ro riguez Executive Director, Nuclear tk d and sworn to before me Subscribyday of July,1983.
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f SACRAMENTO MUNCIPAL UTILITY DISTRICT Rancho Seco Nuclear Generating Station No Significant Hazards Consideration Evaluation i
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In compliance to 10CFR 50.91 the Sacramento Municipal Utility District i
submits the following evaluation of the hazards consideration involved with its proposed Amendment No. 97.
This evaluation addresses the three standards set forth in 10CFR 50.91 (b) as quoted below:
The commission may make a final determination pursuant to the procedures in 550.91 that a proposed amendment to an operating license for a facility licensed under 550.21 (b) or 550.22 or for a testing facility involves no significant hazards consider-ation, unless it finds that operation of the facility in ac-cordance with the proposed amendment would:
(1)
Involve a significant increase in the probability or consequences of an accident previously evaluated; or (2) Create the possibility of a new or different kind of accident from any accident previously evaluated; or (3) Involve a significant reduction in a margin of safety.
Evaluation The District submits that the license change addressed by this proposal i
is not the class of change r. overed by the three standards of 1GCFR 50.91 (b) and, accordingly no significant hazards consideration finding is war-ranted.
In particular, this change only converts the schedule for Instrument Sur-veillances for the Auxiliaor Feedwater Start Circuit. The specific change is to-reverse the test requirements for items 48.a and 48.b, as follows:
Current Specification Check Test Calibrate
- 48. Auxiliary Feedwater Start Circuit a.
Phase Imbalance /Underpower RCP S
M R
b.
Low Main Feedwater Pressure NA NA R
Proposed Specification 1
- 48. Auxiliary Feedwater Start Circuit
- a. Phase Imbalance /Underpower RCP S
NA R
- b. Low Main Feedwater Pressure NA M
R This change puts the monthly test requirement on the Low Main Feedwater Pressure function instead of the Phase Imbalance /Underpower RCP function.
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The latter function,.if tested can result in an inadvertent trip of the unit due to the design of this circuitry.
By placing the monthly testing requirement on the Low Main Feedwater Pressure function, which is relatively easily tested with little or no danger of an inadvertent reactor trip, the reliability of the unit is increased and unnecessary challenges to the trip circuitry / safety features systems are avoided.
Also, the Phase Imbalance /Underpower RCP function will continue to be checked on a shift basis and both functions will continue to be calibrated on a refueling interval basis.
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