Part 21 Report - 1995-217
ACCESSION #: 9510260001 INEL LOCKHEED MARTIN Lockheed Idaho Technologies Company P. O. Box 1625 Idaho Falls, ID 83415 Idaho National Engineering Laboratory September 19, 1995 Mr. Thomas G. Scarbrough, Project Officer Division of Engineering Office of Nuclear Regulatory Research U.S. Nuclear Regulatory Commission Washington, DC 20555 DETERMINATION OF 10 CFR PART 21 REPORTING REQUIREMENTS - RGB-18-95 References: JCN A6857, "Equipment Operability (Mechanical)" R. Steele letter to Dr. G. H. Weidenhamer, "Isolation Valve Assessment (IVA) Software Error," RS-14-95, September 15, 1995 Dear Mr. Scarbrough: This letter continues an earlier report of a software error in the Isolation Valve Assessment Software (IVA) Version 4.10 reported by R. Steele in the referenced letter. As you know, during a recent internal assessment, we determined that a few selected results from IVA Version 4.10 coding used to assess the performance of motor-operated valves (MOVs) appear to be incorrect. We have notified all registered IVA users of the error, but we cannot anticipate how they may have used IVA at a particular facility. Therefore, we have determined that we are not in a position to identify any substantial 'Safety hazard for reporting under 10 CFR Part 21. If an individual user identifies a safety noncompliance in their application of the IVA software, we would expect them to notify NRC under 10 CFR Part 21. The following is a concise definition of the problem: Identification of Basic Component The error is in the Isolation Valve Assessment (IVA) Software, Version 4.10. This error is restricted to that portion of the software code that assesses MOV diagnostic test data for a gate valve in the opening only. Mr. Thomas G. Scarbrough September 19, 1995 RGB-18-95 Page 2 Discovery Date The discovery date of this error was September 13, 1995. Nature of Defect A preliminary investigation indicates that there is an incorrect sign in that portion of the IVA Software that sums the vertical force terms acting on a gate valve disc during an opening test. When used to evaluate MOV diagnostic test data, the error may produce estimates for disc factor that are too low. If used in design-basis calculations, this value could produce nonconservative estimates of the required valve stem thrust needed to overcome design-basis conditions. Equipment Affected The error is isolated to the assessment of motor-operated gate valve diagnostic test data for the opening direction. Licensee Corrective Action During the resolution of this issue, any Licensee should restrict the use of IVA Version 4.10 to areas other than the assessment of diagnostic test data for gate valve opening. Any use of Version 4.10 to evaluate diagnostic test data for gate valves in the opening direction should be reevaluated using other methods. If a Licensee identifies a safety noncompliance in their application of the IVA software, they would be expected to notify NRC under 10 CFR Part 21. INEL Corrective Action The INEL has notified users of IVA Version 4.10 of the error in the opening test assessment section by letters dated September 15, 1995. Further, the error will be corrected and the program reissued after reverification. We are investigating how this error escaped the independent validation and verification (V&V) of this program. The V&V was conducted by an independent design review committee and met all the requirements of ASME Standard NQA-1-1994 quality plan and the NQA-2-1994, Part 2.7 software quality control requirements. Mr. Thomas G. Scarbrough September 19, 1995 RGB-18-95 Page 3 Any questions or clarifications regarding this determination may be directed to R. Steele, Jr. (208-526-6409) or J. C. Watkins (208-526- 0567). Sincerely, R. G. Bennett, Manager Nuclear Engineering Technologies Department KGD cc: S. F. Armour, DOE-ID, MS 1219 K. G. DeWall, LMIT, MS 3870 Document Control Desk, USNRC J. A. Lake, LMIT, MS 3860 D. A. Love, LMIT, MS 3591 R. Steele, Jr., LMIT, MS 3870 J. C. Watkins, LMIT, MS 3870 JCN File A6857 R. G. Bennett File File Code 417 *** END OF DOCUMENT ***
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