ML17291A152

Discusses Closeout of GL 89-10,Suppl 5, Inaccuracy of Motor-Operated Valve Diagnostic Equipment

ML17291A152
Person / Time
Site:	Columbia
Issue date:	06/21/1994
From:	Clifford J Office of Nuclear Reactor Regulation
To:	Parrish J WASHINGTON PUBLIC POWER SUPPLY SYSTEM
References
GL-89-10, TAC-M88021, NUDOCS 9406270369
Download: ML17291A152 (7)

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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON. D.C. 205S&400I June 21, 1994 Docket No. 50-397 Hr. J.

V. Parrish (Hail Drop 1023)

Assistant Hanaging Director, Operations Washington Public Power Supply System P. 0.

Box 968

Richland, Washington 99352-0958

SUBJECT:

CLOSEOUT OF GENERIC LETTER 89-10, SUPPLEHENT 5,

" INACCURACY OF HOTOR-OPERATED VALVE DIAGNOSTIC E(UIPHENT" (TAC NO. H88021)

On June 28,

1993, the NRC staff issued Supplement 5,

" Inaccuracy of Hotor-Operated Valve Diagnostic Equipment," to Generic Letter (GL) 89-10, "Safety-Related Hotor-Operated Valve Testing and Surveillance."

Supplement 5

requested nuclear power plant licensees and construction permit holders (1) to reexamine their motor-operated valve (HOV) programs and to identify measures taken to account for uncertainties in properly setting valve operating thrust to ensure operability, and (2) to evaluate the schedule necessary to consider the new information on HOV diagnostic equipment inaccuracy and take appropriate action in response to that information.

Within 90 days of receipt of Supplement 5 to GL 89-10, licensees were required (1) to notify the NRC staff of the diagnostic equipment used to confirm the proper size or to establish settings for safety-related

HOVs, and (2) to report whether they had planned action (including the schedule) to address the new information on the accuracy of HOV diagnostic equipment.

The staff has reviewed the responses and has found that, for the most part, licensees and permit holders have been actively addressing the uncertainties regarding the accuracy of HOV diagnostic equipment, The increased inaccuracy of HOV diagnostic equipment can raise questions regarding (1) the adequacy of torque switch settings to provide sufficient thrust while not exceeding thrust or torque structural limits and (2) the capability of actuator motors at current settings.

In their responses, licensees and permit holders indicated that many HOVs had the potential for underthrusting or overthrusting as a

result of the higher than expected inaccuracy of HOV diagnostic equipment.

Consequently, some licensees reported that HOVs have been retested,

adjusted, or modified to resolve the concerns regarding the accuracy of HOV diagnostic equipment.

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In its response dated Augu".-t 31, 1993, the licensee stated that it uses HOV diagnostic equipment manufactured by ITI-HOVATS, including the

TTC, SSR and

SST, The licensee stated that it may combine this equipment with commercially available stem or yoke mount. strain gauges.

The licensee stated that it had used the ITI-HOVATS THD in the past.

In Harch and April 1992, 115 HOVs that 940Smoaw9 940iaa P PDR ADOCK 05000397~i, P

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Hr. J.

V. Parri sh were set up using the THD had been evaluated in accordance with ITI-HOVATS Engineering Report 5.2 The MOVs were found to be acceptable either through analysis or retesting conducted in spring 1992.

The licensee stated that the use of yoke-mounted strain gauges, when calibrated in the closed direction, might overpredict thrust for the open direction.

Yoke-mounted strain gauge testing methodology was still being reviewed.

During the NRC inspection in September 1993, the staff found that the licensee had applied no measurement error adjustment to the data obtained from the THD when testing was performed under dynamic conditions.

In Inspection Report 50-397/93-23, the staff assigned this issue as an open item pending inspector review of the application of ITI-HOVATS Engineering Report 5.2 to dynamic test data.

During a future inspection, the staff will discuss the licensee's resolution of the HOV diagnostic equipment accuracy issue.

This completes NRC staff efforts on TAC No. H88021.

If you have any questions regarding this issue, please call me at 301-504-1352.

Sincerely, ORIGINAL SIGNED BY:

cc:

See next page DISTRIBUTION:

Docket File NRC

& Local PDRs JRoe EAdensam TQuay AHansen James W. Clifford, Senior Project Manager Project Directorate IV-2 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation JClifford DFoster-Curseen OGC ACRS (10)

KPerkins, RIV, WCFO TScarbrough OFC LA:DRPW PH:P V-2 D:PDIV-2 NAME DFoster-Curseen JClifford: k TQuay DATE

/

94 (y /

/94 4/ >l/94 OFFICIAL RECORD COPY DOCUMENT NAME:

WNP88021.LT2

P

Hr. J.

V. Parrish were set up using the THD had been evaluated in accordance with ITI-HOVATS Engineering Report 5.2 The MOVs were found to be acceptable either through analysis or retesting conducted in spring 1992.

The licensee stated that the use of yoke-mounted strain gauges, when calibrated in the closed direction, might overpredict thrust for the open direction.

Yoke-mounted strain gauge testing methodology was still being reviewed.

During the NRC inspection in September

1993, the staff found that the licensee had applied no measurement error adjustment to the data obtained from the THD when testing was performed under dynamic conditions.

In Inspection Report 50-397/93-23, the staff assigned this issue as an open item pending inspector review of the application of ITI-MOVATS Engineering Report 5.2 to dynamic test data.

During a future inspection, the staff will discuss the licensee's resolution of the HOV diagnostic equipment accuracy issue.

This completes NRC staff efforts on TAC No. H88021.

If you have any questions regarding this issue, please call me at 301-504-1352.

Sincerely, ORIGINAL SIGNED BY:

cc:

See next page DISTRIBUTION:

Docket Fi1 e NRC 5 Local PDRs JRoe EAdensam TQuay AHansen James W. Clifford, Senior Project Manager Project Directorate IV-2 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation JClifford DFoster-Curseen OGC ACRS (10)

KPerkins, RIV, WCFO TScarbrough OFC NAME DATE LA:DRPW DFoster-Curseen

~'. /4>/94 PH:P V-2 JClifford: k 6 /Q/94 D:PDIV-2 T(}uay

'/

~i/94 OFFICIAL RECORD COPY DOCUMENT NAME:

WNP88021.LT2

Hr. J.

V, Parrish were set up using the THD had been evaluated in accordance with ITI-HOVATS Engineering Report 5.2 The HOVs were found to be acceptable either through analysis or retesting conducted in spring 1992.

The licensee stated that the use of yoke-mounted strain gauges, when calibrated in the closed direction, might overpredict thrust for the open direction.

Yoke-mounted strain gauge testing methodology was still being reviewed.

During the NRC inspection in September 1993, the staff found that the licensee had applied no measurement error adjustment to the data obtained from the THD when testing was performed under dynamic conditions.

In Inspection Report 50-397/93-23, the staff assigned this issue as an open item pending inspector review of the application of ITI-HOVATS Engineering Report 5.2 to dynamic test data.

During a future inspection, the staff will discuss the licensee's resolution of the HOV diagnostic equipment accuracy issue.

This completes NRC staff efforts on TAC No.

M88021.

If you have any questions regarding this issue, please call me at 301-504-1352.

Sincerely, cc:

See next page J

mes W, Clifford, Senior Project Manager Project Directorate IV-2 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation

Mr. J.

V. Parrish WPPSS Nuclear Project No.

2 Washington Public Power Supply System (WNP-2) cc Hr. J.

H.

Swai1 es WNP-2 Plant Manager Washington Public Power Supply System P. 0.

Box 968

Richland, Washington 99352-0968 G.

E.

C. Doupe,

Esq, (Hail Drop 396)

Washington Public Power Supply System 3000 George Washington Way P. 0.

Box 968

Richland, Washington 99352-0968 Mr. Warren Bishop, Chairman Energy Facility Site Evaluation Council P. 0.

Box 43172 Olympia, Washington 98504-3172 Hr.

H. K. Kook (Mail Drop PE20)

WNP-2 Licensing Manager Washington Public Power Supply System P. 0.

Box 968

Richland, Washington 99352-0968 Hr. Paul R.

Bemis (Mail Drop PE20)

Regulatory Programs Manager Washington Public Power Supply System P. 0.

Box 968

Richland, Washington 99352-0968 Regional Administrator, Region IV U.S.

Nuclear Regulatory Commission Harris Tower II Pavilion 611 Ryan Plaza Drive, Suite 400 Arlington, Texas 76011-8064 Chairman Benton County Board of Commissioners P. 0.

Box 190

Prosser, Washington 99350-0190 Hr.

R.

C, Barr U.

S. Nuclear Regulatory Commission P. 0.

Box 69

Richland, Washington 99352-0968 M. H. Philips, Jr.,

Esq.

Winston

& Strawn 1400 L Street, N.W.

Washington, D.C.

20005-3502