ML19343B644
| ML19343B644 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 12/17/1980 |
| From: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19343B645 | List: |
| References | |
| TAC-43285, NUDOCS 8012290301 | |
| Download: ML19343B644 (3) | |
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SACRAMENTO MUNICIPAL UTILITY DISTRICT C) 6201 S Street Box 15830. Sacramento, California 95813 916) 452-3211 8
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3' Mr. Darrell G. Eisenhut, Director Division of Licensing Office of Nuclear Reactor Regulation Nuclear Regulatory Commission Washington, D.C.
20555 Re: Docket No. 50-312 Proposed Amendment No. 73 Rancho Seco Nuclear Generating Station, Unit No. I
Dear Mr. Eisenhut:
In accordance with 10 CFR 50.59, the Sacramento Municipal Utility District proposes to amend its operating.Iicense, DPA-54, for Rancho Seco Nuclear Generating Stat'lon No. !, by submitting Proposed Amendment No. 73 on December 17, 1980. Today, we are submit-
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ting forty (40) opies of Proposed Amendment No. 73 which shows the changes we are proposing. Under this cover, we will be, providing for this submittal, as required per 10 CFR 170. This amend-payment ment has been determined to be Class I(1 since it involves a single environmental issue. A payment of $4,000 is enclosed.
The Miscellaneous Water Evaporator, schematic attached, is designed to operate so as not to interfere with the safe plant operations.
The Evaporator has been designed to ASME Boller and Pressure Vessel Code Section I and in accordance with USNRC Reg Guides 1.26 The Evaporator package will be powered from a nonvital and 1.143 power supply, with its cables routed. separately from any Class IE Overpressure protection for the evaporator vessel has
, equipment.
been provided by the use of a pressure switch control on the heater Over-elements and by redundant full capacity code safety valves.
fill protection has been provided by level switch control on the fill pump and valve, also an operator will be present during filling and starting operations.
In the unlikely event of a spill, the water would. drain into local area drains provided to contain the spillstof.
other existing equipment in the Tank Farm area.
All vital equipment in the Tank' Farm area will be protected during construction, erection, and. assembly by the use of specifically t
j developed procedures.
i 51N290 $ o f p AN ELECTRIC SYSTEM S E RVIN G MORE THAN 600,000 IN THE HEART OF C ALIFO R N I A
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1 Mr. Darrell Eisenhut 2
December 17,'1980 i
The tritium activity released will be monitored as a batch process by sampling and spectral analysis prior to and immediately following evaporation. The activity released will result in a maxi-mum whole body dose in unrestricted areas of 0.211 mrem / year. The total activity released will be 70 Ci/yr, well below the Environmental Impact Statement limit of 900 Cl/yr.
3 it is highly unlikely that a seismic event could affect the pressure regulating and heater controlling functions and also render the safety valves inoperable, leading to an over-pressurization resulting in rupture of the tank or attached piping. The likely mode of failure for a safety valve in a seismic event would be to open, rather than to distort such that the valve would stick shut following the event.
In addition, two valves have been provided for redundancy.
The system layout is such that no component would fall on a Class lE component during a seismic event.
The lines from the boiler are not high energy lines under the criteria specified in the Rancho Seco FSAR and therefore, consid-eration of this line for a high energy break is not necessary and does not create the possibility of an accident of a different type than any evaluated previously.
Environmental effects will.not exist since the
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system is located outside.
Histing or water droplets which may be formed during the start-up of the unit can be eliminated by slower start-up rates, or decreasing the exit velocity from the stack.
Incorporation of these options would not be determined until the time of start-up.
Start-up tests will be performed to determine if any modifications or special procedures are necessary to prevent the formation of droplets.
The evaporator will be located to eliminate any possibility of missies affecting Class I equipments at Rancho Seco.
Mr. R. Colombo, on my staff at Rancho Seco, will clarify and answer any questions concerning this proposal.
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, Sincerely,
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J. J. Mattimoe Assistant General Manager and Chief Engineer JJM:RWC':rm Sworn to me and subscribed before me W
this /7 day of December,1980.
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