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L M ADisoN AVENUE AT PUNCH BOWL Ro AD e MORRISToWN. N.J. 07060 e 539 6111 f
May 22, 1973
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!!r. A. Giambusso Deputy Director for Operating Reactors D
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-Directorate of Licensing United States Atenic Energy Con:cission 5
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k'ashington, D.C.
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Dear Mr. Giambusso:
SUBJECT:
OYSTER CREEK NUCLEAR GENERATING STATION DOCKET 50-219 SUPPLEMENT MO. 4 s
FACILITY CHANGE REQUEST NO. 4 Pursuant to Title 10, code of Federal Regulations, Section 50.59, three signed..iginals and 37 copics of the Oyster Creek Nuclear Generating Station Supplement No. 4 to Facility Change Request No. 4 are herein subad t ted.
This document supplements information presented in the subject Change Request by indicating that the reported values for beginnins: of cycle and
-maximum reactivity effective multiplication factors are conservative in light of the fact that calculational uncertainties have been added to the reported values in a conservative manner in lieu of reporting the design point with the uncertainties indicated separately.
Very truly yours, f
M 0l.'Ifl.' N' N Ivan R. F1 f rock, Jr.
Vice Pres tient ash Enclosures f
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SUPPLEMENT NO. 4' FACILITY CilANCE REQUEST NO. 4 OYSTER CREEK NUCLEAR CENERATING STATION DOCKET No. 50-219
'Ihis Supplement is in response to a Comission concern regarding =
the.. minimum shutdown -margin reported in Facility Change Request No. 4.
JERSEY CENTRAL POWER & LIGitT COMPANY By h))N /
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Vice Presideft STATE OF NEW JERSEY
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COUNTY OF MORRIS
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Sworn and subscribed to before me this 27^' day of YA-u,
1973.
cf' AJ Notary Public asb.
MARION P. BAWlEC NOTAr;Y PUBL!C OF NEW JERSEY My Commission Expireslan.21,1974 a
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i OYSTER CREEK NUCLEAR GENERATING STATION SUPPLEMENT NO. 4 TO FACILITY CHANGE REQUEST NO. 4 DOCKET NO. 50-219 AEC QUESTION ON FACILITY CHANGE REQUEST NO. 4:
Please discuss the relationship between the uncertainty in the R values and-the value of keff at the point of maximum reactivity in Cycle 3 and the uncertainty in this value. Why is the design point for keff with the strongest single rod withdrawn as high as 0.9967
RESPONSE
Refer to Section IV, E, Facility Change Request. No. 4.
The reactivity and shutdown margin values were reported and discussed in a context of being conservatively biased rather than being most probable values with superimposed uncertainties.
Rearranging the reported values would yield:
BOC At Max. Reactivity keff, Strongest Rod Withdrawn 0.98410.004 0.98710.009 The R value would be 0.003i0.005. Therefore, the design point for the maximum reactivity with the strongest rod withdrawn does not exceed 0.99.
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