ML20214L190
| ML20214L190 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 08/29/1986 |
| From: | Koester G KANSAS GAS & ELECTRIC CO. |
| To: | Johnson E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| IEB-85-003, IEB-85-3, KMLNRC-86-159, NUDOCS 8609090498 | |
| Download: ML20214L190 (3) | |
Text
v KANSAS GAS AND ELECTRIC COMPANY To-E ELE CTHC COMPANY August 29, 1986 ocas~o or.rea WC E P. f E+0R N F N a>Ci t a s
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(J Mr. E. H. Johnson, Director Dg 7 g
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Division of Reactor Safety and Projects T
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U. S. Nucloar Regulatory Commission
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Region IV 611 Ryan Plaza Drive, Suite 1000 i
Arlington, Texas 76011 KMLNRC 86-159 Re:
Dookot No. STN 50-482 Ref:
- 1) Letter dated 7/30/86 from JEGagliardo, NRC to GLKoester, KG&E 2)KMLNRC 86-091, dated 5/14/86 from GLKoester, KG&E to RDiartin, NRC Subj:
Addition Information Concerning Bulletin 85-03
Dear Mr. Johnson:
The purpose of this letter is to provide additional information regarding the program being used at Wolf Creek Generating Station (WCGS) to accomplish Action Items b through d in NRC IS Bulletin 85-03 This information was requested in Reference 1 and asked for a description of a detailed step-by-step program to verify motor operated m1ve switch settings.
Action Item b in Bulletin 85-03 is the establishment of correct switch settings.
The applicable switches which are discussed in the Bulletin (torque, torque bypass, position ilmit, overload) have been included in the motor operated mlve setting and testing program being used at WCOS.
The original torque switch settings were determined by Limitorque based on informetton supplied by the valve manufacturer.
The mlidity of the original switch settings will be confirmed during testing.
Any discrepancies discovered during testing will be resolved with an engineering emluation.
The msrimum torqu that the valves can withstand without being damaged will be reviewed ngainst the maximum torque capability of the motor operator to ensure that the valve will not be damaged when opening or closing.
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Mr. B. H. Johnson August 29, 1986 KMLNRC 86-159 Page 2 For NSSS furnished valves, the torque switch bypaso settings are furnished for each valve in the NSSS Instruction Books.
These settings will be confirmed through testing.
Por valves not furntahed by the NSSS supplier, the torque switch bypass setting for the opening stroke will be based on information from the valve manufacturers and other sources.
This setting will allow the valve to otroke past the position where the torque switch could stop the opening stroke of the valve prematurely.
These settings will be pro vided with a tolerance and will be checked through confirmation testing for proper operation.
Any setting falling outside the prescribed tolerances will receive an engineering evaluation. The torque switch bypass setting for the closing stroke will be based upon the effect of the flowing fluid at the beginning of the stroke.
Settings will be provided and confirmed as with the opening stroke owltohes.
The position limit switch settings of the valves furnished by the NSSS oupplier are detailed in the NSSS Instruction Books. These settings will be checked through confirmation testing for proper operation.
The position limit switches for valves not furninhed by the NSSS supplier will be not for propor operation of the valve to proside the original design requiremente.
These settings will consider all faceta including the interaction between switches on the same rotor as discussed in IE Information Notice 86-29.
These settings will be provided with a tolerance and checked through confirmation testing for proper operation.
Thermal overload switches for all of these motor operated valves were jumpered out and will remain so.
Tho presence of the jumpers will be verified prior to placing each valve back into service.
Action Item o of Bulletin 85-03 requires awltoh settings be changed, as appropriate to those established in Action Item b.
It also requires testing the valve at the maximum differential preooure or providing justif toation for any enoes in whleh testing at the maximum differential pressure cannot practicably be performed Prior to testing onoh valve, as found awitch nettings will be recorded and compare 1 to the settingo established in Action Item b.
If the torque switch setting is equal or greater than the required cetting and less than the maximum design limit, the motor operated valve will be tested at the no found setting.
If the cetting is less than the required setting, then the eetting will be incrossed to the required value.
1
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e Mr. E. H. Johnson August 29, 1986 KMLNRC 86-159 Page 3 Once the switch settings have been established and changed if necessary, a
program to perform testing of the motor operated valves listed in Reference 2 will b9 started.
The test program at WCGS will combine a differential pressure test and a signature analysis type test similar to the Motor Operated Yalve Analysis and Test System (M0 VATS).
If the testing is performed at a value less than the maximum differential pressure, a calculation will be performed to verify that the output thrust available will be greater than the thrust needed to open the valve at the maximum differential pressure.
The testing performed on each valve will include a stroke test to verify that the settings defined in Action Item b have been properly implemented.
In addition to this testing program which will be implemented at WCGS, procedures will be prepared or revised to ensure that correct switch setting will be maintained throughout the life of the plant.
If you have any questions concerning this matter, please contact me or Mr.
O. L. Maynard of my staff.
Yours very truly,
-/clu G deu A Glenn L. Koester Vice President - Nuclear 00: P0'Connor (2)
JCummins t
.