ML18274A090
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| ML18274A090 | |
| Person / Time | |
|---|---|
| Issue date: | 10/01/2018 |
| From: | Joseph Holonich NRC/NRR/DLP/PLPB |
| To: | |
| Holonich J,, NRR/DLP, 415-7297 | |
| Shared Package | |
| ML18276A132 -Pkg. | List: |
| References | |
| TR-103237-R2 | |
| Download: ML18274A090 (1) | |
Text
REQUEST FOR ADDITIONAL INFORMATION REGARDING EPRI TOPICAL REPORT EPRI MOV PERFORMANCE PREDICTION PROGRAM: ADDENDUM 10 TO EPRI 103237-R2: PPM VERSION 4.0 SOFTWARE CHANGES By letter dated August 30, 2018 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML18255A242), the Nuclear Energy Institute submitted for U.S.
Nuclear Regulatory Commission (NRC) staff review topical report (TR) "EPRI [Electric Power Research Institute] MOV [Motor-Operated Valve] Performance Prediction Program: Addendum 10 to EPRI 103237-R2: PPM [Performance-Prediction Model] Version 4.0 Software Changes."
The NRC staff is reviewing the submittal and has the following questions:
- 1) The submitted topical report details the changes made to the EPRI MOV Performance Prediction Program from software version 3.5 to 4.0. The major change was updating the software from a 32-bit platform to the latest Microsoft 64-bit environment and correcting noted software errors. The four DOS based technical modules (system flow model, glove valve module, butterfly valve module, gate valve module) were recoded from Microsoft QuickBasic to ANSI C. A complete line by line code review was completed and independently verified. Individual unit testing of each new ANSI C module using validation test cases designed to exercise all potential input options was completed comparing the results from each test case to results from the same test case performed with the original QuickBasic module. Please provide a few examples of the test cases performed that verify each module matched or exceeded those performed with the original PPM methodology.
- 2) Version 4.0 was revised to include an option to use the EPRI Refined Gate Valve Unwedging Methodology as defined in Addendum 3 to EPRI TR-103237-R2. Addendum 3 noted that this was an improved method to estimate the unwedging thrust required to open a gate valve from the wedged closed position. Please explain why in Version 4.0 that this is an option.