ML20215D297
| ML20215D297 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 10/01/1986 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20215D288 | List: |
| References | |
| NUDOCS 8610140072 | |
| Download: ML20215D297 (2) | |
Text
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING AMENDMENT N0.121 TO FACILITY OPERATING LICENSE NO. DPR-50 METROPOLITAN EDIS0N COMPANY JERSEY CENTRAL POWER AND LIGHT COMPANY PENNSYLVANIA ELECTRIC COMPANY GPU NUCLEAR CORPORATION THREE MILE ISLAND NUCLEAR STATION, UNIT N0. 1 DOCKET N0. 50-289 INTRODUCTION By letter dated June 26, 1986, GPU Nuclear Corporation (GPU or the licensee) requested amendment to the Technical Specifications (TSs) appended to Facility Operating License No. DPR-50 for the Three Mile Island Nuclear Station, Unit No.1(TMI-1). The proposed amendment would delete the reference to one smoke detector in the Auxiliary Building, elevation 281 feet, in the cable gallery area (Fire Zone 4). The present TSs state that there are four smoke detectors in this fire zone of which a minimum of two must be operable. The proposed revision would state that there are three smoke detectors in this fire zone of which a minimum of two must be operable.
EVALUATION The purpose of smoke detectors is to detect a fire in a particular fire zone. The Fire Hazards Analysis assumes a minimum number of smoke or heat detectors are available in each fire zone according to its specific requirements. The TMI-1 TSs require that a specified minimum number of fire detectors be available in each zone.
However, in each fire zone, the licensee has typically installed more than the minimum number of smoke and/or heat detectors. The total number of detectors available in each zone is listed in the TSs. The licensee desires to delete reference to one of these extra smoke detectors without changing the minimum number required to be operable.
There are several reasons the licensee desires to delete this one smoke detector (labeled AB-4-3), and all are due to its physical location.
- First, the detector is inaccessible for normal maintenance and surveillance. Thus, due to the lack of surveillance, it must be considered inoperable a majority of the time. Second, its physical location in a duct chase makes it ineffective for detecting a fire in the Cable Gallery, Elevation 281'-0",
Zone 4.
The primary reason for this ineffectiveness is due to the high air flow through the duct chase. There are three additional smoke detectors in this fire zone, and all three are in locations accessible for normal maintenance and not affected by high air flow through the duct chase.
8610140072 861001 PDR ADOCK 05000289 PDR p
. We conclude that the proposed amendment is acceptable. The minimum number of required operable smoke detectors has not been changed. The licensee has sufficient justification to remove the one smoke detector in question.
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.
We have determined that the amendment involves no significant increase in the amounts, and no significant change in the types, of any effluents that 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 coment 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.
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, and (2) 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: October 1,1986 Principal Contributor:
J. Thoma
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