ML20031G773

Eia Supporting Amend 36 to License DPR-54

ML20031G773
Person / Time
Site:	Rancho Seco
Issue date:	10/06/1981
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML20031G768	List: ML20031G767 ML20031G771 ML20031G773 ML20031G775
References
TAC-43285, NUDOCS 8110230643
Download: ML20031G773 (2)

Text

- - [p % fg UNITED STATES p

g NUCLEAR REGULATORY COMMISSION

E WASHINGTON. D. C. 20556 Q

ENVIRONMENTAL I!! PACT APPRAISAL BY THE OFFICE ~0F NUCLEAR REACTOR REGULATION SUPPORTING AMENDMENT NO. 36 TO FACILITY OPERATING LICENSE NO. DPR-54 SACRA!! ENTO MUNICIPAL UTILITY DISTRICT RANCHO SECO NUCLEAR GENERATING STATION DOCKET NO. 50-312 Description of Proposed Action In a letter dated December 17, 1980, Sacramento Municipal Utility District (SMUD or the licensee) proposed to amend its operating license, DPR-54, for Rancho Seco Nuclear Generating Station. The proposed amendment contains an addition to the Technical Specifications, Appendix B, Section 2.6.2, on the sampling and monitoring requirements for radioactive effluents.

Specifically, the proposed amendment will be apolicable to the operations of thq Miscellaneous Water Evaporator (MWE) which will be installed in the Mis-cellaneous Liquid Radwaste System. The NWE will be utiliv a to evaporate excess radioactive liquids, which cannot be reused due to the requirements of the plant water balance, and discharge as vapor to the atmosphere.

In the past, excess radioactive liquids were shipped offsite for disposal.

In the submittal, the licensee stated that the design of the MWE system had been in accordance with Regulatory Guide 1.143 and that the tritium activity released would be monitored as a batch process by samoling and spectral analysis prior to and immediately following evaporation.

In addition, the licensee stated that the total tritium activity released would beX70 curies per year and would result in a maximum whole body dose in unrestricted areas of 0.211 mren per year.

Environmental Impacts of Proposed Action The licensee's Effluent and Waste Disposal Annual Report, covering the period from January 1976 through December 1979, reported that the offsite disposal of radioactive liquids averaged 87,500 gallons per year.. Therefore, we estimate l

that 100,000 gallons por year will be handled by tne WE. Additionally, we estimate an annual release of 70 curies of tritium activity from the proposed i

operation based on the review of the aforementioned data. The additional release of 70. curies per year represents 40". of the 1980 total tritium release, 177 curies, in gaseous effluent from Rancho Seco. However, the sum of the tritium releases in gaseous affluent from the proposed operation ar.d all other operations is calculated to be less than the calculated release of 900 curies per year, provided in the Final Environmental Statement (FES).

We estimate that the additional activity released will increase the total body dose in unrestricted areas by 0.2 mrem per year. Further, we have determined that the additional activity released will not result in an estimateo annual external dose from gaseous effluents to any individual in unrestricted areas in excess of 5 millirems to the total body'. We have also detemined that the 8110230643 811006 i

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Rancho Seco 2-concentration of tritium released in gaseous effluents to unrestricted areas will be less than the applicable limit in 10 CFR Part 20. Accordingly, we conclude.that the MWE will meet the requirements of 10 CFR Part 20 and the dose design objectives specified in Appendix I of 10 CFR Part 50.

We have reviewed the design of the MWE system and have determined that the design of the proposed system meets the criteria as set forth in Regulatory Guide 1.143.

We have reviewed the provisions for sampling in the proposed system and found that they are consistent with the criteria as set forth in Regulatory Guide 1.21.

In addition, based on our telephone conversation with the licensee, we have determined that there will be no evaporator bottoms from the pro-posed operation. The licensee stated that there would not be evaporator bottoms because only water which has been processed by evaporation, demineral-ization and filtration would be evaporated by the i1WE.

Conclusion We have determined that the proposed amendment authorizes a change in effluent types, i.e., from liquid effluent to gaseous effluent. However, on the basis of the foregoing analysis, we have concluded that there will be no environ-rental impact attributable to the proposed action other than.has already been predicted and described in the Conmission's T ES for Rancho Seco. Having made this conclusion, we have further concluded that no environmental impact state-ment for the proposed action need be prepared and that a negative declaration to this effect is appropriate.

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Date: October 6,1981

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