ML20058A667
| ML20058A667 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 10/22/1990 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20058A665 | List: |
| References | |
| NUDOCS 9010290067 | |
| Download: ML20058A667 (2) | |
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO. 61 TO FACillTY OPERATING LICENSE NO. NPF-43 DETR0li EDISON COMPANY FERMI-2 DOCKET NO. 50-341
1.0 INTRODUCTION
By letter dated December 7, 1989, The Detroit Edison Company (DECO or the licensee) requested amendment to the Technical Specifications (TS) appended to facility Operating License No.'NPF-43 for Fermi-2.
The proposed amendment i
would revise the TS to remove an existing footnote associated with the Limiting Condition for Operation (LCO) of Section 3.6.4.1.
This section of the TS specifies the operation of the Suppression Chamber Drywell Vacuum Breakers. The application supersedes a December 22, 1988 application dealing with the same subject.
2.0 EVALUATION Vacuum breakers between the suppression chamber atmosphere and drywell provide vacuum relief to the drywell after a postulated Loss-of-Coolant Accident (LOCA).
The TS requires that all suppression chamber-to-drywell vacuum
-breakers be closed (normal operating position) when manually opened for inerting the containment.- The exception is called out in a footnote to the LC0 in Section-3.6.4.1 of the TS which also requires that all vacuum breakers be closed within two hours after the inerting of the primary containment has been completed. The bases for the footnote in the curreat TS is to allow the i
opening of the vacuum breakers during containment inarting te facilitate' nitrogen flow from the suppression chamber atmosphe"e through the vent
' headers.
The proposed change to the TS would delete the-subject footnote. Manually i
opening of the vacuum breakers bypasses the pressure suppression feature of the BWR Mark I Primary Containment. The containment was not designed to contain the e'fsets of a LOCA if these vacuum breakers are open prior to the start of a LOCL
.The proposed change prevents manually opening the vacuum breakers by deleting the subject footnote.
The proposed change;to the TS is more restrictive on plant operat. ion because
-manual operation of the suppression chamber vacuum breakers is no' longer allowed._ Therefore,Lthe staff-finds the proposed change to be acceptable.
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3.0 ENVIRONMENTAL CONSIDERATION
This amendment involves a change in the installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20 and changes in surveillance requirements.
We hare determined that this amendment involves no significant increase in the amounts, and no significant change in the types, of any effluents which may be released offsite, and that there is no significant increase in individual or cumulative occupational radiation exposure.
The Commission has previously issued a proposed finding that this amendment involves no significant hazards consideration and there has been no public comment on such finding. Accordingly, this amendment meets the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9).
Pursuant to 10 CFR 51.22(b), no environmental impact statement or environmental assessment need be prepared in connection with the issuance of this amendment.
4.0 CONCLUSION
We have concluded, based on the considerations discussed above, that (1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, (2) such activities will be conducted in compliance with-the Commission's regulations, and (3) the issuance of this amendment will not be inimical to the common defense and security or to the health and safety of the public.
Principal Contributor: John Stang Date: October 22,1990 i
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