ML20002B196
| ML20002B196 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 10/21/1980 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Finfrock I JERSEY CENTRAL POWER & LIGHT CO. |
| References | |
| NUDOCS 8012110060 | |
| Download: ML20002B196 (3) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION g
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October 21, 1980 o
Docket No. 50-219 g
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.; c Mr. I. R. Finfrock, Jr.
MzE d.k Vice President T'
2 Oyster Creek Nuclear Generating Station 3
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P. O. Box 388 2
5 Forked River, New Jersey 08731 2
Dear Mr. Finfrock:
By letter dated June 27, 280, and supplement dated July 7, '.980, Jersey Central Power and Light Company (JCP&L) submitted an evaluation of two possible cracks in one of the two core spray systems. The two possible cracks are located within the reactor vessel between the inlet nozzle and the vessel shroud. Our letter dated July 9, 1980 provided the results of our evaluation of your submittals. The results of our evaluation indicated that if it is assumed that the linear mdications are cracks and if the piping fails at these locatiom (inside the reactor vessel), addition of water to the reactor vessel through the affected core spray header reactor vessel nozzle would not restrict flooding capability. The staff agreed with your preliminary evaluation that, following failure of the second core spray inlet, the clad temperatures and metal-water reaction calculated in accordance with Appendix K requirements are below 10 CFR 50.46 limits. However, we indicated that our final approval is contingent upon submittal and review of the detailed analysis which was submitted in summary form.
By letter dated July 31, 1980, JCP&L submitted an analysis aerformed by the Exxon Nuclear Company that shows that the Oyster Creek reactor could experience a core spray line break LOCA with failure of cracks in the unbroken spray sparger and still meet the criteria of 10 CFR 50.46. This analysis assumed that although the cracked sparger could not be guaranteed to deliver the required spray cooling, the water inventory associated with the spray flow would still be delivered to the reactor vessel. The LOCA temperature transient would be terminated by bottom reflood.
The analysis consisted of previous blowdown results for the core spray line break to time of rated spray, a conservative estimate of the time to reflood to the core midplane, rod-to-rod and rod-to-cannister radiation from time of rated spray to reflood of core 2
midplane and a reflood heat transfer coefficient of 25 BTU /hr-ft _op following reflood to the core midplane. The maximum predicted cladding temperature was 20880F.
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. October 21, 1980 Based on our review, we conclude that the conservative analysis demonstrates that under the conditions described above, the Oyster Creek reactor will still meet the criteria of 10 CFR 50.46 and, therefore, it is acceptable.
Sincerely, f
' M.
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Uennis M. Crutch ield, C Operating Reactors Branc #5 Division of Licensing cc: See next page
Mr. I. R. Fi nf rock, J r. October 21, 1980 cc G. F. Trowbridge, Esquire Gene Fisher Shaw, Pittman, Potts and Trowbridge Bureau Chief il 20 M Street, N. W.
Bureau of Radiation Protection Washington, D. C.
20036 380 Scotts Road Trenton, New Jersey 08628 GPU Service Corporation ATTN: Mr. E. G. Wallace Commissioner Licensing Manager New Jersey Department of Energy 260 Cherry Hill Road 101 Commerce Street Parsippany, New Jersey 07054 Newark, New Jersey 07102 Natural Resources Defense Council Plant Superintendent 91715th Street, N. W.
Oyster Creek Nuclear Generating Washington, D. C.
20006 Station P. O. Box 388 Forked River, New Jersey 08731 Steven P. Russo, Esquire 248 Washington Street Resident Inspector P. O. Box 1060 c/o U. S. NRC Toms Ri ver, New Jersey 08753 P. O. Box 128 Forked River, New Jersey 08731 Joseph W. Ferraro, Jr., Esquire Deputy Attorney General Director, Technical Assessment Div.
State of New Jersey Office of Radiation Programs Department of Law and Public Safety (AW-459) 1100 Raymond Boulevard U. S. Environmental Protection Newark, New Jersey 07012 Agency Crystal Mall #2 Ocean County Library Arlington, Virginia 20460 Brick Township Branch 401 Chambers Bridge Road U. S. Environmental Protection Brick Town, New Jersey 08723 Agency Region II Office Mayor ATTN: EIS COORDINATOR Lacey Township 26 Federal Plaza P. O. Box 475 New York, New York 10007 Forked River, New Jersey 08731 Commissioner Department of Public Utilities State of New Jersey 101 Comerce Street Newark, New Jersey 07102