ML20065H392

Forwards LERs 82-100/03L-0 & 82-101/03L-0.Detailed Event Analysis Submitted

ML20065H392
Person / Time
Site:	San Onofre
Issue date:	09/24/1982
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20065H394	List: ML20065H392
References
NUDOCS 8210050096
Download: ML20065H392 (2)

Text

.e C'71.73 Southern California Edison Company !?: em y SAN 40FRE NUC LE A R GE NER A TINJ S T A TION

?

h5 J: 'j R .o. .o u .

S AN C L EME N T E. C A LIFOH Nil. 92672 H. B. R A Y ""*"o~'

.T a r.oN uaNaa. . September 24, 1982 ( P l el 49, 7 700 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. H. Engelken, Regional Administrator

Subject:

Docket No. 50-361 30-Day Reports Licensee Event Reports No.82-100 and 82-101 San Onof re Nuclear Generating Station, Unit 2 Pursuant to Section 6.9.1.13b of Appendix A, Technical Specifications to Operating License NPF-10, for San Onof re Unit 2, this submittal provides the required 30-day written reports and copies of .icensee Event Reports

( LER's) for two occurrences involving the Auxiliar y Feedwater ( AFW)

System.

On August 25, 1982, while in Mode 3, turbine-driven AFW pump 2P-140 was found to be inoperable. The drive turbine was tripping on overspeed during the starting sequence. Accordingly, Action Statement "a" of Limiting Condition for Operation (LCO) 3.7.1.2 was entered. This LCO requires that while in Mode 1, 2 or 3, at least three independent AFW pumps and associated flowpaths shai! 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 />.

Tripping was caused by condensate in the steam supply header and throttle i valve. A watch was posted on the turbine and steam traps were blown

! down on the steam supply header and throttle valve every twc hours.

This removed the unwanted condensation and permitted the pump to bc l tested and declared operable on August 27, 1982. LER 82-100 addresses this occurrence.

l 8210050096 820924 PDR ADOCK 05000361

-19

@-34 (

i

• i R. H. Engelken September 24, 1982 Later, on August 27,1982 pump 2P-140 was again declared inoperable due to tripping caused by a defective speed sensor associated with the drive turbine overspeed protection. The sensor was replaced and the pump restored to operability on August 28, 1982. LER 82-101 addresses this oCCurrenCO.

With respect to the occurrence described in LER 82-100, it appears that drains may not have been configured to properly remove the condensation causing the problem. Some drains have been modified and will be tested for effectiveness when plant u 3 ration resumes. Additional drain con-figurations are under study as 's the operating procedure for the drive turbine. These may be changed as a result of these studies at a later dato not yet established, in both these events, there was no consequence to the public health and safety since any one of the remaining two AFW operable pumps would have performed the necessary decay heat removal function if required to do so.

Ii ihere are any questions, please contact me.

Sincerely, H SR 9 / rm&nA

Enclosure:

LER's82-100 and 82-101 cc: A.E. Chaffee (USNRC Resident inspector, San Onofre, Unit 2)

U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Office of Management information & Program Control (MIPC)

INPO (Institute of Nuclear Power Operations) l