Part 21 Report - 1998-600

LICENSEE: ABB COMBUSTION ENGINEERING SITE: ABB COMBUSTION ENGINEERING EN NUMBER:34639 DOCKET: EVENT DATE: 08-13-98 RX TYPE: EVENT TIME: 15:08 VENDORS: NOTIFY DATE: 08-13-98 EMERGENCY CLASS: N/A REGION: 1 STATE: CT TIME: 15:08 OPS OFFICER: STEVE SANDIN 10 CFR SECTION: CCCC 21.21 UNSPECIFIED PARAGRAPH PART 21 NOTIFICATION REGARDING METHODOLOGY TO SELECT THE LIMITING ASSEMBLY FOR PWR THERMAL-HYDRAULIC SAFETY ANALYSES. THE FOLLOWING IS A PORTION OF A FACSIMILE RECEIVED: "COMBUSTION ENGINEERING, INC. HAS EVALUATED A DEFICIENCY IN ITS CURRENT SCREENING METHODOLOGY FOR DETERMINING THE LIMITING FUEL ASSEMBLY FOR DETAILED PWR THERMAL-HYDRAULIC SAFETY ANALYSES. THE DEFICIENCY IS THAT THE SCREENING METHODOLOGY BASED ON LOW INLET FLOW MAY NOT CONSISTENTLY IDENTIFY THE MOST LIMITING ASSEMBLY IN THE PRESENCE OF VERY FLAT CORE AND ASSEMBLY POWER DISTRIBUTIONS. THE CONCLUSION OF THE EVALUATION WAS THAT THE DEFICIENCY COULD, UNDER SOME CIRCUMSTANCES, CONSTITUTE A DEFECT AS DEFINED BY 10 CFR 21. THE THERMAL-HYDRAULIC ANALYSIS METHODS THEMSELVES, WHEN APPLIED TO THE LIMITING ASSEMBLY, YIELD VALID RESULTS AND ARE NOT AT ISSUE." "THE CURRENT ANALYSES OF RECORD FOR THE FOLLOWING U.S. NUCLEAR POWER PLANTS ARE AFFECTED BY THE DEFECTIVE SCREENING METHOD: ANO-2, CALVERT CLIFFS-1/2, PALO VERDE-1/2/3, SONGS-2/3, ST. LUCIE-2, WATERFORD-3, AND, POSSIBLY, FT. CALHOUN." "ABB CE DOES NOT KNOW THE APPLICABILITY FOR OTHER ABB CE DESIGNED NUCLEAR POWER PLANTS IN THE US, AS IT HAS NOT BEEN RECENTLY INVOLVED WITH NUCLEAR SAFETY ANALYSES OF NUCLEAR FUEL AT THOSE PLANTS. FOR THESE PLANTS, ABB CE WILL ISSUE A LETTER INFORMING THEM OF THIS CONDITION AND ADVISING THEM TO EVALUATE THE APPLICABILITY OF THE SITUATION. THESE PLANTS ARE: MILLSTONE-2, MAINE YANKEE (SHUTDOWN), PALISADES, AND ST. LUCIE-1."

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