ML20027D633

LER 82-018/01T-0:on 821014,three of Six Installed Safety Valves Determined to Have Degraded Performance Based on Valve Ring Settings.Cause of Difference in Ring Settings Unknown.Valves Reset Using EPRI Tested Settings

ML20027D633
Person / Time
Site:	Oconee
Issue date:	10/28/1982
From:	Norris J DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20027D630	List: ML20027D629 ML20027D633
References
LER-82-018-01T, LER-82-18-1T, NUDOCS 8211080177
Download: ML20027D633 (1)

Text

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NRC FORM 346 U.S. NUCLE AR REGULATORY COMMISSION APPROVED BY OME

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(PLEASE PHINT OR TYPE ALL REQUIRED INFORMATION)

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R EPORT D ATE SS EVENT DESCRIPTION AND PROSABLE CONSEQUENCES O'o l a l2 l l On October 14, 1982, three of the six installed safety valves on the three j gg g Oconee units were determined to have significantly degraded performance based  ;

ga p ll on valve ring settings. Although degraded, the small actual relief required )

lo ls l l and the low probability of requiring safety valve relief precluded affecting l the health and safety of the public.

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CAUSE CESCRIPTION AND CORRECTIVE ACTIONS h l i l o.l l Prior to EPRI testing the effects of ring settings and backpressure on valve l ij,ll relief performance were not known. The reason that the older Dresser valve l l i l 2 l l ring settings were significantly different from newer valves is unknown. All [

,;3g[ valves at Oconee were reset using EPRI tested settings. g 1114 l l l STAT 5  % power OTNER STATUS iSCOVERY DISCOVE RY DESCRIPTION l 1l s l l E l @ l 1 l 0 l 0 [@l NA l l Cl@l Test Data Analyses l 7 .. i. in is u . .

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TYPE D E S C RIPTIO N l 1 l 9..l l Z [@li. NA l PU suCiv v issUEo D E s C RiPvsON NRC USE ONLY I 2 l 0 l l Y l@! Press Release (10/1A/R91 ,,

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NAME OF PREPAREN J hn F. Norris PHONE: (704I '4 7 'l- 2 8 /. /-

8211000177 821028 PDR ADOCK 05000269 S PDR

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