05000338/LER-1980-093-01, /01T-0:on 801126,util Learned That Manufacturer Gave Erroneous Value for Weights of Two Valves in RHR Sys. Caused by Manufacturer Error.Support Will Be Modified to Increase Safety Factor of Anchor Bolts to Correct Value

/01T-0:on 801126,util Learned That Manufacturer Gave Erroneous Value for Weights of Two Valves in RHR Sys. Caused by Manufacturer Error.Support Will Be Modified to Increase Safety Factor of Anchor Bolts to Correct Value

ML19345D138
Person / Time
Site:	North Anna
Issue date:	12/04/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345D137	List: 05000338/LER-1980-093, Forwards LER 80-093/01T-0 05000338/LER-1980-093-01, /01T-0:on 801126,util Learned That Manufacturer Gave Erroneous Value for Weights of Two Valves in RHR Sys. Caused by Manufacturer Error.Support Will Be Modified to Increase Safety Factor of Anchor Bolts to Correct Value
References
LER-80-093-01T, LER-80-93-1T, NUDOCS 8012090365
Download: ML19345D138 (2)

LER-1980-093, /01T-0:on 801126,util Learned That Manufacturer Gave Erroneous Value for Weights of Two Valves in RHR Sys. Caused by Manufacturer Error.Support Will Be Modified to Increase Safety Factor of Anchor Bolts to Correct Value

Event date:
Report date:
3381980093R01 - NRC Website

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1 O) s U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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LICENSEE CODE LICENSE NUMBER LICENSE TYPE CAT g/ (6)

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DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10) i

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VEPC0 was informed that it had been provided an erroneous value for the weights /

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of 2 valves in the Residual Heat Removal System.

Since the correct value

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differed by >10%, a seismic stress analysis was performed in accordance with

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- IE Bulletin 79-14 which concluded that the anchor bolts on support H-110-D

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(1-RH-P-1A) have a safety factor of 2.9, which is below the minimum of 4.0

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required by the Bulletin. Since the safety factor is >2.0, continued operation /

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is justified, and the health and safety of the public are not affected.

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SYSTEM

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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The original data on the valves, supplied by the manufacturer, Copes-Vulcan,

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stated that each valve weighed 3534 lbs. VEPCO was later informed that this

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information was erroneous, and told the correct weight of each valve is 2809

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lbs. The corrective action will be to modify the support such that the safety /

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factor of the anchor bolts is increased to a value 24.0.

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FACILITY METHOD OF STATUS

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PUBLICITY ISSUED DESCRIPTION (45)

NRC USE ONLY

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NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151-8 012090 M5

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s-Virginia Electric and Power Company

- North Anna Power Station, Unit #1 Attachment: Page 1 of 1

~ Docket No. 50-338 Report No. LER 80-093/01T-0

Description of Event

Virginia Electric and Power Company was informed of an error made by~ Copes-Vulcan (the vendor) in providing the weight of 2 values which are.in the Resideal Heat Removal System.. Since the erroneous value (3534 lbs) and the correct value (2809 lbs) differed by > 10%, a seismic stress analysis was performed in accordance with IE Bulletin 79-14 which concluded that the anchor bolts on support H-110-D (1-RH-P-1A) have a safety factor of 2.9, which is below the minimum of 4.0 required by.the bulletin. The event is reportable pursuant to T.S. 6.9.1.8.i.

Probable Consequences of Occurrence

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Since the safety factor is > 2.0, continued operations is justified, and the health and safety of the public are not affected.

Cause of Event

4 The valve manufacturer, Copes-Vulcan, made an error when reporting the valve weight for MOV-1700 and MOV-1701 as being 3534 lbs as opposed to the correct weight of 2809 lbs.

Immediate Corrective Action

No immediate correc+.ive action is required.

Scheduled Corrective Action A change to the support is being' developed in order to upgrade the anchor bolts on support H-110-D. ~The modificatioa will be made during the upcoming refueling outage.

Actions Taken to Prevent Recurrence i-No further actions are required.

Generic Implications There are no generic implications.

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