ML20207L711
| ML20207L711 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 03/11/1999 |
| From: | Jaffe D NRC (Affiliation Not Assigned) |
| To: | NRC (Affiliation Not Assigned) |
| References | |
| NUDOCS 9903180242 | |
| Download: ML20207L711 (4) | |
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- 5 March 11, 1999 MEMORANDUM TO:
Docket File FROM:
David H.Jaffe, Senior Project Manager Original signed by:
Project Directorate ll-2 Division of Licensing Project Management Office of Nuclear Reactor Regulation
SUBJECT:
VOGTLE UNITS 1 AND 2 - PUTTING A DOCUMENT IN THE PUBLIC DOCUMENT ROOM The attached topics were faxed today to Jim Bailey of Southern Nuclear Operating Company, Inc. (SNC). The sole purpose of the attachment is to prepare SNC personnel for an upcoming conference call. The attachment itself does not constitute a formal request for information or represent a formal NRC staff position.
Docket Nos. 50-424 and 50-425
Attachment:
As stated Distribution (PUBLIC o PDll-2 RF H. Berkow J.Tsao C.Hawes l
To receive a copy of this document, indicate in the box:
"C" = Copy "N" = No Copy
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March 11, 1999 i
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MEMORANDUM TO:
Docket File FROM:
David H. Jaffe, Senior Project Manager Project Directorate 112 i
Division of Licensing Project Management
- Office of Nuclear Reactor Regulation 1
l
SUBJECT:
VOGTLE UNITS 1 and 2 - PUTTING A DOCUMENT IN THE i
PUBLIC DOCUMENT ROOM The attached information was faxed today to Jim Bailey of Southern Nuclear Operating Company, Inc. (SNC). The attachment itself does not constitute a formal request for i
information, at this time, or represent a formal NRC staff position.
I i
Docket Nos. 50-424 and 50-425
Attachment:
As stated i
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REQUEST FOR ADDITIONAL INFORMATION ON RESPONSE OF VOGTLE ELECTRIC GENERATING PLANT TO GENERIC LETTER 96-05 1.
In NRC Inspection Report No. 50-424 & 425/97-04, the NRC staff closed its review of the i
motor-operated valve (MOV) program implemented at Vogtle Electric Generating Plant (Vogtle) in response to Generic Letter (GL) 89-10, " Safety-Related Motor-Operated Valve Testing and Surveillance." In the inspection report, the NRC staff discussed certain aspects of the licensee's MOV program to be addressed over the long term. For example, the inspectors noted that the licensee would (1) include an additional 5% bias margin to the target thrust settings of all torque switch controlled rising-stem valves; (2) formally review the NRC's safety evaluation of the Electric Power Research Institute 1
(EPRI) MOV Performance Prediction Model (PPM); (3) modify the Group AD-3 valves to increase their thrust output and revise the thrust requirements to use more conservative i
assumptions; (4) increase the available margins for Group FG-1 valves; (5) revise the thrust requirements for valve Groups W-1A, W-28, and W-8 based on a review of available in-plant dynamic test data; (6) use industry test data or the EPRI MOV PPM to justify the thrust requirements for valve Groups W-9, W-11, and W-12; (7) update its calculations for alilimit-switch-controlled MOVs with standard ACME thread stems to use a 0.18 stem friction coefficient; and (8) dynamically test two 18" Fisher butterfly valves to ensure that all of its 18" Fisher butterfly valves have adequate capability under design-basis conditions. The licensee should describe the actions taken to address the specific long-term aspects of the MOV program at Vogtle noted in the NRC inspection report.
2.
In a letter dated June 3,1998, the licensee updated its commitment to implement the i
Joint Owners Group (JOG) Program on MOV Periodic Verification in response to GL 96-05. The JOG program specifies that the methodology and discrimination criteria for ranking MOVs according to their safety significance are the responsibility of each participating licensee. The licensee stated in its letter that the Westinghouse Owners' Group (WOG) methodology for ranking MOVs based on their safety significance was being evalcated for use at Vogtle. If the WOG MOV risk-ranking method as described in Engineering Report V-EC-1658-A (Revision 2, dated August 13,1998), " Risk Ranking Approach for Motor-Operated Valves in Response to Generic Letter 96-05," and the NRC safety evaluation dated April 14,1998, is not used, the licensee should describe the methodology used for risk ranking MOVs at Vogtle in more detail, including a description of (1) the process used to develop a sample list of high-risk MOVs from other Westinghouse plants; and (2) how expert panels were used to evaluate MOV risk significance.
3.
The licensee's updated commitment stated that Vogtle will continue to use its own MOV static diagnostic test program in lieu of the JOG interim MOV static diagnostic test program. The JOG MOV Periodic Verification Program consists of three phases: (1) the interim MOV static diagnostic testing program; (2) an MOV dynamic testing program over the next 5 years; and (3) the long-term periodic testing program. The NRC staff considers a licensee's commitment to the JOG program to include all three phases unless otherwise specified. Where a licensee that has committed to implement the JOG I
program proposes to implement a different approach, the licensee will be expected to notify the NRC and to provide justification for the proposed attemative approach. The l
licensee should clarify its commitment to the JOG program at Vogtle or justify its interim ATTACHMENT
static diagnostic test program for those MOVs that will not follow the JOG program recommendations.
4.
In a letter dated March 12,1997, the licensee stated that new diagnostic technologies that monitor MOV performance at the motor control center (MCC) may be used, as appropriate The licensee should briefly describe its plans for the use of test data from
.e motor contro! center (MCC) including (1) correlation of new MCC test data to existing direct force measurements; (2) interpretation of changes in MCC test data to changes in MOV thrust and torque performance; (3) consideration of system accuracies and sensitivities to MOV degradation for both output and operating performance requirements; and (4) validation of MOV operability using MCC testing.
5.
The JOG program focuses on the potential age-related increase in the thrust or torque required to operate valves under their design-basis conditions. In the NRC safety evaltration dated October 30,1997, on the JOG program, the NRC staff specified that licensees are responsible for addressing the thrust or torque delivered by the MOV motor actuator and its potential degradation. The licensee should describe the plan at Vogtle for ensuring adequate ac and de MOV motor actuator output capability, including consideration of recent guidance in Limitorque Technical Update 98-01 and its Supplement 1.
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