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LICENSEE: SIEMENS POWER CORPORATION SITE: SIEMENS POWER CORPORATION EN NUMBER:31366 DOCKET: 07001257 EVENT DATE: 11-21-96 RX TYPE: EVENT TIME: 00:00 VENDORS: NOTIFY DATE: 11-21-96 EMERGENCY CLASS: N/A REGION: 4 STATE: WA TIME: 15:40 OPS OFFICER: STEVE SANDIN 10 CFR SECTION: CCCC 21.21 UNSPECIFIED PARAGRAPH 10 CFR PART 21 NOTIFICATION OF DEFECT IN 1986 EXEM PWR LBLOCA MODEL "THIS FACSIMILE IS TO INFORM THE NRC OF A REPORTABLE DEFECT PER 10 CFR PART 21." "IN A TELEPHONE CONVERSATION ON OCTOBER 10, 1996, SIEMENS POWER CORPORATION (SPC) AND ITS CURRENT PWR UTILITY CUSTOMERS WERE INFORMED THAT THE NRC HAD REJECTED SPC's PROPOSED 1991 CHANGES MADE TO THE FCTF REFLOOD HEAT TRANSFER CORRELATIONS IN THE TOODEE2 CODE IN THE APPROVED 1986 EXEM PWR LARGE BREAK LOSS OF COOLANT ACCIDENT (LBLOCA) EVALUATION MODEL. THESE CHANGES WERE SUBMITTED TO ELIMINATE A NON-PHYSICAL TREND IN HEAT TRANSFER COEFFICIENTS AS A FUNCTION OF REFLOOD RATE IN THE 1986 EXEM PWR LBLOCA EVALUATION MODEL. THE NRC ALSO CONCLUDED, BASED ON THE INFORMATION AVAILABLE TO THE STAFF, THE NON-PHYSICAL TREND IN THE 1986 EXEM PWR LBLOCA EVALUATION MODEL WAS CONSIDERED TO BE AN UNACCEPTABLE ERROR. THESE NRC DETERMINATIONS WERE DOCUMENTED IN A LETTER FROM R.C. JONES (USNRC) TO H.D. CURET (SPC) DATED OCTOBER 11, 1996. AS A RESULT OF THESE DETERMINATIONS, SPC PERFORMED A 10 CFR 21 EVALUATION IN ACCORDANCE WITH THE SPC PROCEDURES. THIS LETTER DOCUMENTS THE RESULTS OF THIS PART 21 EVALUATION." "THE SPC PART 21 EVALUATION CONCLUDED THE ERROR IN THE FCTF HEAT TRANSFER CORRELATIONS IN THE 1986 EXEM PWR EVALUATION MODEL TO BE A SUBSTANTIAL SAFETY DEFECT. THE BASIS FOR THIS CONCLUSION RESTS ON THE FACT THAT CERTAIN PLANTS ANALYZED WITH THE INTERIM CORRECTIONS TO THE FCTF HEAT TRANSFER CORRELATIONS EXCEEDED 10 CFR 50.46 LIMITS." "THE AFFECTED PWR UTILITIES WERE INFORMED OF THE TELEPHONE CONVERSATION, A MEETING CONDUCTED BY THE NRC HELD ON WEDNESDAY, OCTOBER 16, 1996 IN ROCKVILLE, MD REGARDING THE IMPACT OF THE DEFECT ON CALCULATED 10 CFR 50.46 CRITERIA, AND DIRECT COMMUNICATIONS BETWEEN THE UTILITIES AND SPC. ACTIONS TAKEN AND TO BE TAKEN TO ADDRESS THE ISSUE ARE TO BE PROVIDED IN A WRITTEN REPORT TO THE NRC IN COMPLIANCE TO 10 CFR 21.21 (d)(3)(ii)."