ML19317G769
| ML19317G769 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 08/07/1978 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML19317G759 | List: |
| References | |
| NUDOCS 8004010597 | |
| Download: ML19317G769 (3) | |
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UNITED STATES y*
NUCt. EAR REGULATORY COMMISSION
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7 WASHINGTON, D. C. 20565
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REA "'R REGULATION SUPPORTING AMENDMENT NO. 21 TO FACILITY OPERATI'
.aNSE NO. DPR-54 SACRAMENTO MUNICIPAL UTILITY DISTRICT RANCHO SECO NUCLEAR GENERATING STATION O
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Introduction By letter dated April 12, 1978, the Sacramento Municipal Utility District (the licensee) requested certain changes to Facility Operating License No. DPR-54 for Rancho Seco Nuclear Generating Station (the facility).
The proposed changes consist.of several deletions, additions and revisions to the Facility Technical Specifications, Appendix B, Section 2.6.4, dealing with the sampling and monitoring requirements for gaseous radio-active effluents.
Discussion and Evaluation The proposed Technical Specification changes and our evaluation are as follows :
- 1) Add a monitoring requirement to Section 2.6.4.B and a sampling and analy-sis requiremen: to Table 2.6-2 for the auxiliary building exhaust fan E F-A-9.
This fan (19,000 scfm) takes suction from the controlled area of the auxiliary building anc has an unmonitored exhaust on the auxiliary t'uilding roof.
While the equipmen; in areas serviced by the fan (elec-trical penetrations, motor control centers, and other ventilation equi?-
ment) are not sources of radioactivity, airborne activity released frcm nearby equipment could reach the fan suction. On the grade level of tne auxiliary building, wnere one of the fan suction gratings is located, the solid radwaste crumming station and access hatches for the racwaste ion exchangers represent potential sources of airborne activity since they are not isolated frcm the fan suction by structural walls. The ad-dition Of monitoring and samcling requirements for this release point will assure that airborne activity is not released without being de:ectec and measured. Current 'y, the fan exhaust does not have a monitor; and, until one is installed, the licensee has cormitted not to operate the fan.
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. h Current Specification 2.6.4.8 requires monitoring of gaseous releases to the environment, and specifies corre.tive action if the monitors are in-operable. The specification does not identify what the release points are for those gaseous releases. The proposed change to this paragraoh identifies release points requiring monitoring as the auxiliary building and reactor building stacks, in addition to fan EF-A-9 previously mentioned.
Rewriting the paragraph in this manner identifies all gaseous radioactivity release points, eliminating any confusion that might arise from the vague wording of the current specification.
- 2) A new paragraph, Section 2.6.4.C, is proposed, which would specify monitoring requirements for the Condenser Air Ejector and the Gland Seal exhausts.
Neither of these streams is an environmental release point, because they are routed to the auxiliary building stack.. For this reason, no sampling requirement is proposed; and the monitoring is only recuired for gaseous activity. The purpose for monitoring these streams is to identify primary to secondary leakage, whicn should be effectively accomplished by the proposed paragraph.
- 3) A change is proposed for Table 2.6-2, which is referenced in paragraph 2.6.' F.
Similar to the change made in paragraph 2.6.4.B, sampling and analysis requirements are added for exhaust fan EF-A-9 and the two other environmental release points (i.e., the Auxiliary Building Stack and the Reactor Building Stack). The requirement for Condenser Air Ejector sampling has been deleted since it is not an environmental release point.
4)
Editorial changes involving renumbe' ring of Sections 2.6.4.C, D and E as Sections 2.6.4.D, E and F, respectively have been made.
This is necessary because of the addition of new paragraph 2.6.4.C as discussed in Item 2 above.
- As discussed above, the proposed Technical Specification is an improvement over the present Technical Specification in that it recuires the monitoring of a radioactivity release point previously not identified as sucn and it adds the requirement of monitoring of Condenser Air Ejector and Gland Seal l
exhaust for the purpose of better identifying primary and secondary leakage.
We, therefore, find the proposed Technical Specification changes to be ac-ceptable.
Environmental Considerations We have determined that the amendi..mt does not authorize a change in efflu-ent types or a significant increase in the total amounts of effluents nor an increase in power level and will not result in any significant environecrul impact.
Having made this determination, we have further concluded that the amendment involves an action which is insignificant from the standcoint of i
environmental imoact and, pursuant to 10 CFR 551.5(d)(a), that an environ-mental impact statement or negative declaration and environmental impact appraisal need not be prepared in connection with the issuance of this amend-l ment.
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We have concluded, based on the considerations discussed above, that:
(1) because the amendment does not involve a significant increase in the probability or consequences of accidents previously considered and does not involve a significant decrease in a safety margin, the amendment does not involve a significant hazards consideratir7, (2) there is reasonable assurance that the health and safety of the public-will not be endangered by operation in the proposed manner, and (3) such activities will be conducted in compliance with the Commission's regulations and the issuance of this amendment will not be inimical to the common defense and security or to the health and safety of the public.
Dated: August 7. 1978 i
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