ML19326B662

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{{#Wiki_filter:, / N / i ( V) H E L PIN G U UILO A R o< A N S A S ARK ANS AS POWER & LIGHT COMPANY 97H S. LOUISlANA STAEETS Lt?TLE ACCK. A AK ANSA S 72203 15013372-4311 August 29, 1975 s Mr. B. C. Rusche, Director Office of Nuclear Reactor Regulation U. S. Nuc1 car Regulatory Commission Washington, D. C. 20555 / Subj ect: Arkansas Power S Light Company Arkansas Nuclear One-Unit 1 Docket No. 50-313 License No. DPR-51 Abnormal Occurrence Report No. 50-313/74-11B

Dear Mr. Rusche:

G My letter to Mr. Case of Februaly 5,1975, provided preliminary results of the investigations into the cause of leaks in the schedule 10 stain-less steel' reactor building spray system piping at Arkansas Nuclear One-Unit I and promised a final report upon completion of all investigations. At this time all investigations are complete, with the exception of a study to determi.1e the probability of catcstrophic failure of the affected piping under design stresses. Attached find the final report promised in the November 1974 letter. 'lko copies of a more detailed report are also attached. Single etnies of the detailed report are also being provided i to the NRC Inspection and Enforcement Region II and IV offices. Very truly yours, ) /,// \\' p' J. D. Phillips Senior Vice President JDP:ay ,/ [D u ooomo sos g>v,, v e f T AX A AYING. INVESTO A QWNEO MEMBE A MIODLE SOUTH UTILITIES SYSTEM fePY StWT REGION, 2

2-August 29, 1975 Mr. B.-C. Rusche_ I i cc:. Mr. Norman C. Moseley,' Director Office of Inspection and Enforcement Region II U. S. Nuc1 car Regulatory Commission 230 Peachtree Street, N.W., Suite 818 Atlanta, Georgia' 30303 Mr. E. Morris lloward, Director Office of Inspections 6 Enforcement Region IV U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012 4 4 h i i a + 't i i ^: + b d I. 1 9 4 i - I ..--9.,,-e r se-*vw-2--- - - -evw -me - - - -, + - - - - * - - - - - - - - +


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~ f r ADDENDUM i 3 This report is being sent to the ANO plant site for review concurrently in order to expedite NRC review. This-report has not been endorsed by l plant ute personnel but has been prepared and reviewed by general office nuclear services personnel. A copy of the detailed report is available at the plant site. ~ b j i i j i l d i i I i r j j i i i Ij i 1 i 1# 1 i I i f f I!' l t t . i h-i i -rv-n--.,r-am-an-,,,,_-,,,w ne-vr. ean<m,-- ~,rm.,,,,,--,-,, on,n-e~~4}}