ML20195K420

Forwards LERs 99-003-00 & 99-004-00 Re Manual Esfas (Reactor Trips) Due to Problems with Main Feedwater Control.Two Events Are Being Reported Separately Because Actual Causes Are Considered Different & Independent of Each Other

ML20195K420
Person / Time
Site:	San Onofre
Issue date:	06/11/1999
From:	Krieger R SOUTHERN CALIFORNIA EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20195K425	List: ML20195K420
References
RTR-NUREG-1022 NUDOCS 9906220088
Download: ML20195K420 (2)

Text

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c L. qu s<a, Ju o-U EDISON An flEON 1\"ll RN 4TIO% 4L" Coinpuny l

June 11,1999 U. S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555 Gentlemen:

Subject:

Docket No. 50-362 30-Day Reports Licensee Event Reports No. 1999-003 and 1999-004 San Onofre Nuclear Generating Station, Unit 3 This letter provides Licensee Event Reports (LERs) 1999-003 and 1999-004 in accordance with ,

10CFR50.73(a)(2)(iv) for manual Engineered Safety Feature actuations (reactor trips) due to )

problems with main feedwater control.

l NUREG 1022, Rev 1, Section 2.3 - Multiple Failures and Related Events allows, but does not i require, "[m] ore than one failure or event [to be] reported in a single ... LER if(l) the failures or  !

events are related (have the same general cause or consequences) and (2) they occurred during a single activity (e.g., test program) over a reasonably shon time (within .. 30 days of discovery of i the first reportable event ...)."

The events reported in LERs 1999-003 and 1999-004 have the same general causes (loss of feedwater control), same general consequence (manual reactor trip), occurred during a single activity (startup following refueling), and occurred over a short time (2 days). Nevertheless, the two events are being reported separately because the actual causes are considered different and independent of each other. The two events do, however, have some common corrective actions relative to preventative maintenance and these are included in the enclosed LERs.

The health and safety of neither the public nor plant personnel were affected by this occurrence.

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OO 9906220088 990611 "

i PDR ADOCK 05000362 1 S PM $

P.O.Ikn 128 San Clemente. CA 92674 0128

r-Document Control Desk June 11,1999 i

Any actions listed are intended to ensure continued compliance with existing commitments as discussed in applicable licensing documents; these LERs contain no new commitments. Ifyou require any additional information, please so advise.

Sincerely, jvi LER Nos. 1999-003 and 1999-004 cc: E. W. Merschoff, Regional Administrator, NRC Region IV J. A. Sloan, NRC Senior Resident Inspector, Units 2 and 3 L. Raghavan, NRC Project Manager, San Onofre Units 2 and 3 Institute of Nuclear Power Operations (INPO) 1 l

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