ML17289A824

Part 21 Rept Re Undersized Yoke Clamps on Three HPCS motor- Operated Valves Supplied by Anchor/Darling Valve Co.Nde Will Be Performed on All Clamps to Determine If Condition Affects Valve Operability.Clamps to Be Replaced by 921031

ML17289A824
Person / Time
Site:	Columbia
Issue date:	08/14/1992
From:	WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	NRC
References
REF-PT21-92 NUDOCS 9209030013
Download: ML17289A824 (6)

Text

ACCESSIQA NBR: 5'209030013 DQC. DATE'2/08/14 NQTARIZED:

NO FACXL: 50-397 NPPSS Nuclear Pro Ject.

Unit 2E Washington Public Poee AUTH. NANE AUTHOR AFFILIATION Nashington Public Paver Supply SMstem RECIP. NANE RECIPIENT AFFILIATION NRC No Detailed Affiliation Given DOCKET 0 05000397

SUBJECT:

Part 21 rept re undersized yoke clamps on three HPCS motor-operated valves supplied bg Anchor/Darling Valve Co. NDE eill be performed on all clamps to determine if condition affects valve operability. Clamps to be replaced bg

'zt21031.

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2 TITLE: Part 21 Rept (50 DKT)

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INTERNAL: AEOD/DSP/ROAB NRR/DRXS/RVIB'PD RES/DSXR/EIB RGN2 RGN4 SECY VANDERI'lEL EXTERNAL:

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NOTE TO ALL "RIDS" RECIPIFNTS:

PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK.

ROOM P 1-37 (EXT. 504-'2065) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED:

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40 CFR PART 21 REPORT MOTOR OPERATED VAIVE YOKE CLNNPS PAGE.882 rrac:.~ iw z

This fs.a,10.GFR'..part 21.repoit submitted fn accordance withthe requfrements of,10',CFR:-

21.21." Verbal nOtfIICiitian'.Of:thfSICOindrfticnWaSi,made':tO';NRC;OPeratfOnS'On Aujje't'=14' 1992.'he-fnform&on required:fs,prorvfded.below.

Anchor/Darling Valve Company 701 First Street P.O.. Box 3428 Willlamsport, Pa 17701~28 The yoke clamps of three High Pressure Core Spray (HPCS) motor operated valves at WNP-2 were found to be undersized.

The clamps were supplied withthe valves manufactured'by Anchor/Darfing, 7wo ofthe three valves are on the'return Ifne to the Condensate Storage Tanks, HPCS-V-10 and -11, and the third valve fs on the return line to the Suppression Pool, HPCS-V-23. Astress analysis indicated the clamps would exceed the yfeld strength of the clamp material whenever the valves are stroked closed.

As a result, the number of allowable valve actuation cycles is much less than design.

The yoke clamps are expected to perform their function for more than 10 years of routfna surveillance testing and under all accident conditions.

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The actual condmon at WNP-2 was not safety significant Engineering calculatfons indicate that the yoke damp wfil withstand at least 150 cycles.

To date an estfmated 100 cycles have been piaced on the valves.

Based on the absence of a critical flaw, the yoke cfaraps stiff have a reasonable life.

However, non-destrucUve examination (NDE) willbe performed on all three clamps by October 31, 1S92 to determine ifthe condition affected valve operability. An evaluation wfff be done following NDE to determine ifthe condition fs reportable pursuant to the requirements of 50 CFR 50.72 or 10 CFR 50.73.

The defect was fdentmed on July'2?, 1992.

WNP-2 was the purchaser, not the supplier of these parts.

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The orfginalfy installed clamps will be replaced wfth new clamps by October 31, 8

1992. The Supply System is responsible for the corrective actions.

The Suppfy System has never experienced a failure of these clamps.

Any questfons concerning this report shoufd be referred to Mr. R. E. Fuller, Compliance Engineer, who can be reached at {609) 3?7%$ 48.

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