ML20054G540
| ML20054G540 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 06/10/1982 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Bauer E PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| References | |
| IEB-80-13, NUDOCS 8206220009 | |
| Download: ML20054G540 (2) | |
Text
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'JUN 10 1982
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D. Eisenhut J. Heltemes M. Fairtile
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Docket No. 50-277 R. Ingram 9
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Mr. Edward G. Bauer, Jr.
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Vice President and General Counsel
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Dear Mr. Bauer:
By letter dated May 11,1982, and as supplemented on June 4,1982, you infomed us of a crack in the "B" core spray sparger of Peach Bottom Unit 2.
The crack was discovered through an inservice inspection required by IE Bulletin 80-13. " Cracking in Core Spray Spargers." You stated that an evaluation of the crack concluded that no modifications were required to ensure continued safe operation of the reactor. How-ever, you decided to install a clamp at the crack location to provide further assurance of core spray sparger operability and safe reactor operation. In addition, you reanalyzed the effect of complete severence of the sparger in regard to the design basis accident. Your June 4, 1982 letter enclosed a General Electric Report entitled, " Core Spray Sparger Crack Analysis at Peach Bottom Atomic Power Station Unit 2,"
NED0-22139, May 1982.
The GE Report concluded that no loadings have been identified which could result in stresseh that would cause the spargers to break during nomal plant operation, transients, or postulated loss-of-coolant accidents, without the installation of a clamp. We concur in this conclusion.
Section 4 of the GE Report and the May 11, 1982 letter provided the results of a reanalyses of the loss-of-coolant accident. The analysis shows for the limiting case of a single failure of one core spray with the remaining sparger assumed to be one with the cracks, that the peak clad temperatures in the fuel would remain below the 10CFR 50 Appendix K limits without changing the limits of maximum average planar linear heat generation rates within the bounds of the curves of Peach Bottom 2-Cycle 6, the current core loading. We concur in these conglusions.
Based on the above we conclude that operation of Peach Bottom Unit 2 with a cracked, but clamped, "B" core spray sparger will not result in an unsafe operating condition.
Sincerely, 70EIGIL EJ 1"?
J0'ib 1. LP 8206220009 820610 PDR ADOCK 05000277 John F. Stolz, Chief P
PDR Operating Reactors Branch #4 I/ r. /
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<O Philadelphia Electric Company ccw/ enclosure (s):
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Eugene J. Bradley l
Philadelphia Electric Company Regional Radiation Representative Assistant General Counsel EPA Region III 2301 Market Street Curtis Building (Sixth Floor)
Philadelphia, Pennsylvania 19101 6th and Walnut Streets l
Philadelphia, Pennsylvania 19106 Troy B. Conner, Jr.
1747 Pennsylvania Avenue, N.W.
M. J. Cooney, Superintendent Washington, D. C.
20006 Generation Division - Nuclear Philadelphia Electric Company 2301 Market Street Philadelphia, Pennsylvania 19101 Government Publications Section Thomas A. Dcming, Esq.
State Library of Pennsylvania Assistant Attorney General Education Building Department of Natural Resources Comonwealth and Walnut Streets Annapolis, Maryland 21401 Harrisburg, Pennsylvania 17126 Philadelphia Electric Company ATTN: Mr. W. T. Ullrich Peach Bottom Atomic Power Station Mr. R. A. Heiss, Coordinator Delta, Pennsylvania 17314 Pennsylvania State Clearinghouse Governor's Office of State Planning Albert R. Steel Chairman and Development Board of Supervisors P. O. Box 1323 Peach Bottom Township Harrisburg, Pennsylvania 17120 R. D. #1 Delta, Pennsylvania 17314 Curt Cowgill U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Peach Bottom Atomic Power Station P. O. Box 399 Delta, Pennsylvania 17314 Mr. Ronald C. Haynes, Regional Administrator U. S. Nuclear Regulatory Comission, Region I Office of Inspection and Enforcement 631 Park Avenue King of Prussia, Pennsylvania 19406 w.--,
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June 10, 1982 ket No. 50-277 Mr. E ard G. Bauer, Jr.
Vice P sident and General Counsel Philadel ia Electric Company 2301 Market Street s
Philadelphie Pennsylvania 19101
Dear Mr. Bauer:
1982, you and as supplemented on June f,h Bottom By letter dated Ma 11, 1982, k in the "B" core spray sparger of Peac informed us of a cr inspection discovered through an inservice,Spargers."
Unit 2.
The crack wa 80-13. " Cracking in Core Spray You required by IE Bulleti stated that an evaluatio of the crack concluded that no modifications were required to ensure c tinued safe operation of the reactor. How-ever, you decided to instal aclampatthecracflocationtoprovide further assurance of core sp y sparger operabi,Tity and safe reactor operation.
In addition, you analyzed the effect of complete severence l
of the sparger in regard to th designbasiVaccident.
Your June 4, 1982 letter enclosed a General ectric Re rt entitled, " Core Spray Sparger Crack Analysis at Peach B ttom A mic Power Station Unit 2,"
NED0-22139, May 1982.
The GE Report concluded that no loady gs have been identified which could result in stressek that wou/,d c use the spargers to break during l
normal plant operation, transients or stulated loss-of-coolant accidents, without the installation of a el mp. We oncur in this conclusion.
Section 4 of the GE Report a the May 11, 82 letter provided the results of a reanalyses of the loss f-coolant accide The analysis shows for the limiting case of a sin e failure of one co e spray with the remaining sparger assumed to be on with the cracks, that e peak clad temperatures in the fuel would remai below the 10CFR 50 Append K limits without changing the limits of maximum average planar linear eat generation l
rates within the bou s of the curves of Peach Bottom -Cycle 6, the current core loadin. We concur in these conslusions'.
Based on the abo we conclude that operation of Peach Bot m Unit 2 with a cracked, ut clamped, "B" core spray sparger will not esult in e an unsafe oper ting condition.
Sincerely,r
?n A
JolyDF. Stolz, Chief t
Sperating Reactors Branch #4 Division of Licensing i
cc: See next page
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