ML20247D084
| ML20247D084 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 07/18/1989 |
| From: | COMMONWEALTH EDISON CO. |
| To: | |
| Shared Package | |
| ML20247D080 | List: |
| References | |
| NUDOCS 8907250037 | |
| Download: ML20247D084 (8) | |
Text
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i ZION NUCLEAR POWER STATION H OPOSEE CHANGES TO APPENDIX A TECHNICAL SPECIFICATION SECTJDN 3.17.2
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ATTACINENT 2 ZION NUCLEAR POWER STATION l
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EftGEQHEILCIIANSES. TO APPENDIX _&
TECIINICAL SPECIFICATION
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SECTION 3.17.2 "AIBCRAFT GRASH FIRE DETECIIDH SYSTEM AN21JSJLEROBABILISTIf itJSM.F?' LU ATIOH"
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ATTACIRiENT 3 ZION NHCLEAR POWER STATION EROPOSED CHANGES TO APPENDIX A l
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'I EVALUATION QF SIGNIFICANT HAZARDS CONSIDERATLQli Lj s
m ERQEQSED CHANGESJO ZION TECHNICAL SEE.CIFICATION APRENDlK_A - SECIION 3/4.17.2
(
AIRCRAFT FIRE DETECTION SYSTEM l
1 DESCRIPTION OF AMENDMENT REOUEST i
.)
An amendment to the Zion Facility Operating License is proposed to remove.the Aircraft Fire Detection System from the Zion Technical Specifications.
RACKGROUND 10 CFR 50.92 states that a proposed amendment will involve a no significant hazards consideration if the proposed amendment.does nots (1)
Involve a significant increase in the probability or consequences of an' accident previously evaluated; or (2) Create the possibility of a new or different kind of accident from any accident previously evaluated; or (3)
Involve a significant reduction in a margin of safety.
The discussion below addresses each of'these three-criteria and demonstrates that the proposed amendment involves a no significant hazards consideration.
BASIS FOR NO SIGNIFICANT HAIARDS CON.SIDlEAILQli (1)
Involve a significant increase in the probability or consequences of an accident previously evaluated; or
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(2) Create the possibility of a new or different kind of accident from any accident previously evaluated; or' q
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(3)
Involve a significant reduction in a margin of safety.
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RIECUSEIRN.- ITEM _11 The removal of the Aircraft Fire Detection System from Technical Specifications will have no effect on the probability or consequences of any accident previously evaluated. As discussed in the Aircraft Crash Fire Detection System Probabilistic Risk Evaluation Report by Fluor Daniel, January 1989, and as recommended by Commonwealth Edison PWRE Department, the risk associated with an aircraft crash causing a fire hazard within sufficient proximity to ventilation intakes will NOT exceed the probability of occurrence limits as addressed in the Standard Review Plan section 3.5.1.6.
In fact, the report concludes that qualitative arguments exist which may conservatively reduce the probabilities by 50%.
Therefore, based upon the results of the-report, the probability or consequences of any accident previously evaluated will be unaffected by the removal of the Aircraft Fire Detection System from the Technical Specifications.
DISCUSSION - ITEM # 2 As discussed above, since the probability of an increase in the risk to a fire hazard caused by an aircraft crash near ventilation intakes has been analyzed j
to be less than that required by the Standard Review Plan section 2.2.3 and j
3.5.1.6, there is no need to determine the potential for a new or different j
kind of accident due to the elimination of the Aircraft Fire Detection System f
from the Technical Specifications.
I DISCUSSION - ITEM #3 The margin of safety at Zion Station is unaffected by this proposed amendment since the probability risk evaluation has clearly identified that an aircraft crash creating a fire hazard at the station is lower than the requirements of 10-7 per year as stated in Standard Review Plan section 3.5.1.6.
Therefore, since the proposed amendment satisfies the criteria specified in 10 CFR 50.92, Commonwealth Edison Company has made a determination that the application involves no significant hazards consideration.
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