05000361/LER-1982-143, Forwards LER 82-143/03L-0.Detailed Event Analysis Submitted

Forwards LER 82-143/03L-0.Detailed Event Analysis Submitted

ML20070C941
Person / Time
Site:	San Onofre
Issue date:	12/01/1982
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20070C944	List: 05000361/LER-1982-143, Forwards LER 82-143/03L-0.Detailed Event Analysis Submitted 05000361/LER-1982-143-03, /03L-0:on 821101,auxiliary Feedwater Pump 2P-140 Declared Inoperable.Caused by Introduction of Air Into electro-hydraulic Actuator by Low Hydraulic Oil Level Condition Resulting in Slow Response of Governor Valve
References
NUDOCS 8212140398
Download: ML20070C941 (2)

LER-1982-143, Forwards LER 82-143/03L-0.Detailed Event Analysis Submitted

Event date:
Report date:
3611982143R00 - NRC Website

text

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RECB A's Southern California Edison Company agg gge _,

4E S AN ONOFRE NUCLE AR GENER A tlNG ST A TION I

P.O. B O K 1&B S AN CLEMENTE C A LIFORNI A 92672 R

H. B. R AY

'4 setspwoNe ST Af TON M AN AGE R (Fld) 492-7 700 December 1,1982 U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5368 Attention:

Mr. R. ii. Engelken, Regional Administrator

Dear Sir:

Subject: Docket No. 50-361 30-Day Report Licensee Event Report 82-143 San Onofre Nuclear Generating Station, Unit 2 Pursutat to Section 6.9.1.13b of Appendix A, Technical Spscifications to Operating License NPF-10, for San Onofre Unit 2, this submittal provides the required 30-day written report and copy of Licensee Event Report (LER) for an occurrence involving the Auxiliary Feedwater (AFW) System.

A completed copy of LER 82-143 is enclosed.

On November 1,1982 at 1027, while in Mode 1, steam-driven AFW pump 2P-140 tripped on overspeed during an Inservice Inspection (ISI) testing, and was declared inoperable. Accordingly, Action Statement 'a' of Limiting Condition for Operation (LCO) 3.7.1.2 was entered. This LC0 requires that while in Mode 1, 2 or 3, at least three independent AFW pumps and asssociated flow-paths shall be operable.

If one train becomes inoperable, operation may continue provided the inoperable train is restored to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

Subsequent investigation by the manufacturer revealed that e low hydraulic oil level condition introduced air into the electro-hydraulic actuator.

This resulted in a slow response of the governor valve and caused the pump to trip on overspeed. After repairing a small hydraulic leak, the pump was rett:rned to operable status at 1725 on November 2,1982.

8212140398 821201 PDR ADOCK 05000361 QQQ W/'/ /

R. H. Engelken December 1, 1982 As further corrective action to prevent recurrence, procedure S023-I-5.27 will be revised to require periodic verification of hydraulic oil level and removal of any accumulated condensate and trapped air.

The public health and safety were not affected by this event since any one of the two remaining AFW operable pumps (each able to provide 100%

of required capacity) would have performed the necessary decay heat removal function, if required.

If there are any questions, please contact me.

Sincerely, f

Enclosure: LER 82-143 cc:

A. E. Chaffee (USNRC Resident Inspector, San Onofre Unit 2)

U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement U. S. Nudaar Regulatory Commission l

Office of Management Information and Program Control Institute of Nuclear Power Operations l