ML19332F039

Provides Update on Program Implemented in Response to NRC Bulletin 85-003, Motor-Operated Valve Common Mode Failures During Plant Transients Due to Improper Switch Settings. Valves Completed Baseline Testing & Operable

ML19332F039
Person / Time
Site:	Seabrook
Issue date:	11/29/1989
From:	Feigenbaum T PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
IEB-85-003, IEB-85-3, NYN-89154, NUDOCS 8912130308
Download: ML19332F039 (5)

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j, New Hampshire ,a c. r. m Senior Vic'e President and Chief Operoting C$icer NYN- 89154 i November 29, 1989 United States Nuclear Regulatory Commission  !

Washington, DC 20555 i Attention: Document Control Desk i

References a) Facility Operating License WPF-67. Docket No. 50-443 '

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b) IE Bulletin 85-03, ' Motor-Operated Valve Common Mode  !

Failures During Plant Transients Due to Improper Switch .

-Settings,' dated November 15, 1985 q c) PSNH Letter SBN-1052 dated May 15, 1986, ' Response to IE Bulletin 85-03 ' G.S. Thomas to Dr. T. E. Murley, Jr.

d) PSNH Letter NYH-87137 dated November 30, 1987, ' Response to IE Bulletin 85-03.' G.S. Thomas to Mr. W. T. Russell r

Subject:

Informational Update on IE Bulletin 85-03, ' Motor-Operated

-valve Common Mode Failures During Plant Transients Due To Improper Switch ~ Settings * '

i Gentlemen:

New Hampshire Yankee has described in two previous letters (SBN-1052 and NYN-87137) the Program, implemented in response to IE Bulletin 85-03, for testing motor-operated valves in the High Pressure Safety Injection and ,

Emergency Feedwater Systems at Seabrook Station. The purpose of this letter  !

is to provide updated information confirming that this Program has been t fully implemented and that all action items identified in NYN-87137 have '

been completed or resolved.

The motor-operated valves within the scope of the Program have completed baseline testing and are operable. The Program currently utilizes the .

Motor-Operated Valve Analysis and Test System (MOVATS) as the diagnostic

• test equipment for all valves within the scope of the Program. Eight valves in the Emergency Feedwater System are equipped with actuators manufactured i

.by Rotork. Inc. During development of the Program, it was discovered that the MOVATS test equipment was partially incompatible with the unique Rotork '

actuator design. As a result, all required test data could not be obtained using MOVATS equipment alone. _ Reference (d) reported commencement of an effort to develop test equipment which would be fully compatible with the Rotork actuators. New Hampshire Yankee has developed specialized test equipment to be used in conjunction with MOVATS equipment to test the valves 8912130308 891129 PDR ADOCK 05000443 G PNU  :

New Hampshire Yankee Division of Public Service Company of New Hampshire / [

P.O. Box 300

• Seobrook, NH 03874

• Telephone (603) 474 9521 '[

United States Nuclear Regulatory Commission November 29, 1989 Attention: Document Control Desk page 2 3

[' equipped with Rotork actuators. Diagnostic tests have been performed utilizing this specialized test equipment and the test results have been validated. Switch setpoints for the Rotork actuators have been verified to j be conservatively set and therefore have not been adjusted. Enclosure 1 contains a more detailed description of the completed baseline testing of Rotork actuators and the specialized test equipment utilized in conjunction ,

with MOVATS equipment to diagnostically test motor-operated valves equipped with Rotork actuators.

Reference (d) indicated that a trending program was under development.

The Program includes the requirement to trend motor operator performance for the life of the plant. Accordingly, fif teen percent of the thirty motor-l operated valves within the scope of the Program will be inspected and tested every refueling outage. ,

Reference (d) identified six action items which were scheduled to be i completed prior to the first refueling outage. These action items have l been completed or resolved. Revised Summary Report Data Sheets for the thirteen motor-operated valves affected by the action items are available on-site for review. Each Revised Summary Report Data Sheet describes the specific action taken to complete or resolve the pertinent action item.

New Hampshire Yankee has been developing alternative motor-operated valve diagnostic test equipment and methods based upon the use of strain gauges. In order to further improve the effectiveness of the Program NHY is considering replacing the Motor Operated Valve Analysis and Test System (MOVATS) with the alternative diagnostic test equipment and methods under development. Application of the alternative equipment and methods has to date, been limited to motor-operated valves not currently within the scope of the Program. New Hampshire Yankee expects to describe the alternative

! diagnostic test equipment and methods in mere detail in the upcoming

! response to Generic Letter 89-10. ,

l New Hampshire Yankee considers that all commitments associated with IE l Bulletin 85-03 have been satisfactorily met. If you have any questions, please contact Mr. Geoffrey Kingston at (603) 474-9521 Extension 3371.

I I Very truly yours,  ;

fg 2&s& Mm 1 Ted C. Feigenbaum Enclosure

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United States Nuclear Regulatory Commission November 29, 1989 Page 3 Attention: Document Control Desk cci Mr. William T. Russell Regional Administrator

. United States Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia PA 19406 Mr. Victor Nerses, Project Manager Project Directorate 1 3 United States Nuclear Regulatory Commission Division of Reactor Projects Washington, DC 20555 Mr. Antone C. Cerne NRC Senior Resident Inspector P.O. Box 1149 Seabrook, NH 03874 STATE OF NEW HAMPSHIRE November 29, 1989 Rockingham, ss.

Then personally appeared before me, the above-named Ted C. Feigenbaum, being duly sworn, did state that he is Senior Vice President and Chief Operating Officer of the New Hampshire Yankee Division of Public Service Company of New Hampshire, that he is duly authorized to execute and file the foregoing information in the name and on the behalf of New Hampshire Yankee Division of the Public Service Company and that the statements therein are true to the best of his knowledge and belief.

3_cor du b T d owau _

Beverly E.thilloway, NotaryJPublic My Commission Expires: March 6, 1990

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EBCLOSURE 1 TO NYN-89154 DIAGNOSTIC TEST BQUIPMENT AND METHODOLOGY FOR TESTING 10TORK MOTOR-OPERATED YALVES HISTORY:

Eight motor-operated valves in the Emergency Feedwater System are equipped with actuators manufactured by Rotork, Inc. As result of actuator performance during the startup test program, these eight actuators were removed and returned the Rotork facility. There, the units were disassembled and the spring packs were modified to increase the maximum output torque fram 25 ft-lbs to the 40-45 ft-lbs range. The actuator manufacturer calibrated and tested each unit over the entire range of setpoints then established and verified the final torque switch setpoints.

OPERABILITY VERIFICATION:

The torque switch setpoints established by the actuator manufacturer have not changed since the actuators have been returned to the site.

Each actuator has been re-installed in accordance with NHY procedures.

! Following re-installation, each valve and actuator was tested under j maximum practical differential pressure conditions and demonstrated to be operable.

L DIAGNOSTIC TEST SYSTEM DESCRIPTION:

New Hampshire Yankee has developed specialized test equipment to be used in conjunction with MOVATS equipment for testing the eight motor-operated valves with Rotork actuators. The Rotork actuators utilize an unbalanced spring pack design. Because of this unique design, it is not i pessible tofpbtain all required diagnostic test data utilizing HOVATS equipment alone. The specialized test equipment utilizes an in-line load cell manufactured in accordance with NHY specifications. The output of the load cell is calibrated against NBS standards. Mounting

hardware, used in conjunction with the load cell, provides a means of testing both open and close actuator outputs at the torque switch trip setpoints. A detailed explanation for use of the specialized test i equipment and measurement interpretation methods is provided in an '

approved station procedure. The actuator thrust measurement is derived directly from load cell output at the torque switch trip setpoint. The load cell measurement method does not rely upon LVDT (MOVATS TMD) interpretation and thus provides a more direct and accurate method of measuring actuator output thrust. This information together with the l data from the usable MOVATS sensors provides all required diagnostic test data.

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• n 3120ERY 1hPORbETION REGARDING DIAGal0STIC TEST New Hampshire Yankee BQUIFIGINT FOR ROTORK MOTOR-OPERATED VALVES (continued) November 29, 1989 l

l CONCLUSION:

In accordance with the requirements of IE Bulletin 85-03, the correct l switch settings have been established and set by the actuator s manufacturer (Rotork, Inc.) in coordination with the valve manufacturer

! 4 (Masonellan). Actuator re-installation and setpoint verification was performed using NHY procedures. Operability was demonstrated at maximum practical differential pressure during the startup test program. A test i' method has been developed by NHY to measure and determine actuator output thrust for these motor-operated valves. The output thrust values are recorded on the Revised Summary Report Data Sheets. This completes the action items associated with these valves.

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