ML20069D650
| ML20069D650 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 03/07/1983 |
| From: | Morgan H SOUTHERN CALIFORNIA EDISON CO. |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| RO-83-022, RO-83-22, NUDOCS 8303180428 | |
| Download: ML20069D650 (2) | |
Text
..
Southern California Edison Company G?)W
-o 53 R
S AN ONOFRE NUCLE AR GENER A TING ST A TION
/ [ f-P.O. B O X 12 8 S A N C LEMENTE. C A LIFOR NI A 92672 f 'gfg,,
H. B. R A Y
/c TELEPHONE March 7,1983 SvanON N ANAaER o m m iraa 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 Adminstrator
Dear Sir:
Subject:
Docket No. 50-362 Prompt Report Licensee Event Report, No.83-022 San Onofre Nuclear Generating Station, Unit 3 Pursuant to Section 6.9.1.12.6 of Appendix A, Technical Specifications to Facility Operating License NPF-15 for San Onofre, Unit 3, this submittal provides the written confirmation of our March 5,1983 prompt notification to the NRC for a reportable occurrence involving the Containment Cooling System (CCS).
On March 4, 1983, with Unit 3 in Mode 5 at 190 F, all requirements for Mode 4 entry had been satisfied and heatup of the Reactor Coolant System was initiated at 0925. At 1028, an attempt to open valve 3HV6369 in the CCS chiller fan 3ME400 failed. This rendered CCS Train B inoperable.
Although two trains of CCS are not required in Mode 5, Limiting Condition for Operation (LCO) 3.6.2.3 requires two trains of CCS to be operable in Modes 1 through 4 and LCO 3.0.4 prohibits entry into an operational mode unless the conditions of applicable LCO's are met without reliance on the provisions of the Action Statements. Therefore, inoperability of CCS Train B prohibited entry into Mode 4.
The prohibition of Mode 4 entry was immediately recognized by the l
operating shift and action was taken to terminate the RCS heatup with the RCS temperature quite close to 200 F, the threshold temperature for Mode 4.
At i
1240, operating personnel observed RCS temperature to be at 200 F and the Unit thus entered Mode 4 with one train of CCS inoperable.
Operations personnel took immediate action to reduce RCS temperature below 200 F which was accomplished at 1316.
B303180428 830307 gDRADOCK 05000362 3 ~M
- PDR g,g
Mr. R. H. Engelken March 7,1983 The 14-Day Follow-up Report with a copy of Licensee Event Report (LER)
No.83-022 will be submitted by March 18, 1983 to address this event, including corrective actions and measures to prevent recurrence.
If there are any questions regarding the above, please contact me.
Sincerely, b
A cc:
A. E. Chaffee (USNRC Resident Inspector, San Onofre, Units 2 & 3)
R. J. Pate (USNRC Resident Inspector, San Onofre, Units 2 & 3)
_ _ _ _,