ML15075A012
| ML15075A012 | |
| Person / Time | |
|---|---|
| Site: | Nuclear Energy Institute |
| Issue date: | 04/02/2015 |
| From: | Mirela Gavrilas Division of Policy and Rulemaking |
| To: | Earls C Nuclear Energy Institute |
| Holonich, Joseph 415-7297 | |
| References | |
| TAC MF5809 | |
| Download: ML15075A012 (3) | |
Text
April 2, 2015 Mr. Christopher Earls Nuclear Energy Institute 1201 F Street, NW, Suite 1100 Washington, DC 20004
Subject:
STAFF EVALUATION OF THE NRC REVIEW OF TECHNICAL UPDATES TO THE EPRI MOTOR OPERATED VALVE PERFORMANCE PREDICTION METHODOLOGY SOFTWARE VERSIONS 3.4 AND 3.5 (UPDATES)
Dear Mr. Earls,
By letters dated March 10 and June 17, 2014 (Agencywide Documents Access and Management System (ADAMS) Accession Nos. ML14072A043 and ML14176B177), the Nuclear Energy Institute (NEI) submitted to the U.S. Nuclear Regulatory Commission (NRC) a Topical Report (TR) by the Electric Power Research Institute (EPRI) entitled, Summary of Technical Updates to EPRI Motor Operated Valve Performance Prediction Methodology Software Versions 3.4 and 3.5. The NEI requested that the NRC staff review and prepare a supplemental safety evaluation (SE) for EPRIs updated motor-operated valve (MOV) performance prediction methodology (PPM), pursuant to Title 10 of the Code of Federal Regulations (10 CFR) 170.11(a)(1)(iii).
The EPRI MOV PPM software program is a nuclear safety-related computer code for determining the required thrust or torque to stroke gate, globe, and butterfly valves under design basis conditions. The software was originally developed in 1995 and improved over the years.
Improvements included incorporating additional functionality, correcting software errors, incorporating new hand calculation methods, incorporating the software package in a Windows based user interface, adding new features, and incorporating changes related to butterfly valve torque predictions. The successive improvements were categorized by numerical versions 1.0, 2.0, 3.0, 3.1, 3.2, and 3.3.
The NRC staff reviewed and validated the various software versions over the years and documented these reviews in a series of SEs. A historical development of the software and the safety evaluation progression may be found in Supplement 4 to the final safety evaluation of EPRI Topical Report - 103237, EPRI MOV Performance Prediction Program, Revision 2, (ADAMS Accession No. ML090400621).
Version 3.4 of the PPM was issued in December 2008 to address several software error and informational notices, improve the precision of the PPM predictions by tightening criterion, and provide new functionality in the user interface. Version 3.5 of the PPM was issued in December 2011 to address several software error notices, incorporate Systme International d'Unités units of measure, and correct several minor software usability issues related to the user
interface. A summary of the software version changes was provided to the NRC staff for review along with examples and supporting documentation of the software version updates.
The NRC staff has reviewed the update of EPRI TR-103237, Revision 2 software versions 3.4 and 3.5 and has concluded that the changes made were minor in nature in that they corrected coding errors, improved functionality of user interface, improved the overall accuracy, and incorporated fixes to known program inadequacies. The NRC staff also concluded that the changes made in versions 3.4 and 3.5 do not alter the methodology or introduce new methods.
Therefore, the NRC staff finds that versions 3.4 and 3.5 of EPRI TR-103237, Revision 2, are acceptable for referencing in licensing applications and that an updated safety evaluation is not currently required.
In accordance with the guidance on the NRC website, we request that NEI publish accepted proprietary and non-proprietary versions of this TR within three months of receipt of this letter.
The accepted versions shall incorporate this letter and the previously issued final SE after the title page. Also, they must contain historical review information. The accepted versions shall include an -A (designating accepted) following the TR identification symbol. If future changes to the NRCs regulatory requirements affect the acceptability of this TR, NEI and/or licensees referencing it will be expected to revise the TR appropriately, or justify its continued applicability for subsequent referencing.
If you have any questions or need additional information, please feel free to contact the NRC project manager, Mr. Joseph Holonich, at 301-415-7297 or joseph.holonich@nrc.gov.
Sincerely,
/RA/
Mirela Gavrilas, Deputy Director Division of Policy and Rulemaking Office of Nuclear Reactor Regulation Project No. 689
ML15075A012 OFFICE NRR/DPR/PLPB NRR/DPR/PLPB NRR/DE/EPNB NRR/DPR/PLPB NRR/DPR/PLPB NAME JHolonich DHarrison DAlley HCruz for AMendiola MGavrilas DATE 03/18/2015 03/19/2015 04/1/2015 04/2/2015 04/2/2015