ML13324A446
| ML13324A446 | |
| Person / Time | |
|---|---|
| Site: | Perry, Catawba, Harris, Grand Gulf, River Bend, Vogtle, San Onofre, Comanche Peak, Rancho Seco, Midland, Bellefonte, 05000000, Washington Public Power Supply System, Shoreham |
| Issue date: | 10/10/1984 |
| From: | Phelps R SOUTHERN CALIFORNIA EDISON CO. |
| To: | Paulson W Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8410150007 | |
| Download: ML13324A446 (2) | |
Text
Southern California Edison Company P. 0.
BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD. CALIFORNIA 91770 M.O. MEDFORD TELEPHONE MANAGER, NUCLEAR LICENSING October 10, 1984 (213) 572-1749 Director, Office of Nuclear Reactor Regulation Attention: W. A. Paulson, Acting Chief Operating Reactors Branch No. 5 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Gentlemen:
Subject:
Docket No. 50-206 Diesel Generator Stress Analyses Reports San Onofre Nuclear Generating Station Unit 1
Reference:
Letter, M. 0. Medford (SCE) to W. A. Paulson (NRC), dated August 28, 1984, Return to Service Requirements Regarding Transamerica Delaval Emergency Diesel Generators By the referenced letter, we informed you that the results of stress analyses performed by Failure Analysis Associates (FaAA) relative to five major components of the San Onofre Unit 1 diesel generators will be forwarded to you upon availability and completion of review.
The enclosed letter dated September 6, 1984, from the TOI Diesel Generator Owners Group contains a summary of the results and is transmitted to you to fulfill the above commitment.
If you have any questions, please call me.
Very truly yours, ENCLOSURE cc:
USNRC Document Control Desk, Washington, D.C.
20555 A. E. Chaffee (USNRC Resident Inspector Units 1, 2 and 3)
C. L. Ray (TOI Diesel Generator Owners Group) 8410150007 841010 PDR ADOCK 05000206 S
DUKE POWER COMPANY TELEPHONE: AREA 704 P. 0. BOX 33189 GENERAL OFFICES 373-4011 422 SOUTH CHURCH STREET CHARLOTE, N. C. 28242 September 6, 1984 OGTP-256-0-136 David F. Pilmer Southern California Edison 2244 Walnut Grove Avenue Room 320 Rosemead, CA 91770 RECEIVED Re:
San Onofre -
Unit 1 Analysis for Reduced Load Rating File:
MTS-4086 F.
PILMER
Dear Mr. Pilmer:
All Phase I reports issued by the TDI Owners Group to date have been based on assuring the adequacy of the engines at their full rated load capability which would correspond to a load rating of 8800 KW for the DSRV20-4 engine.
Analyses have been performed on five components to quantify the reduction in stresses the San Onofre DSRV20-4 engines experience as a result of their 6000 KW load rating versus the 8800 KW load rating the engine is capable of.
The results are as follows:
% Reduction in Stress Range Component (Steady State)
. Crankshaft 12.4% (See note)
. Connecting Rods 6.0%
. Rod Bearings 16.4%
. Pistons 24.9%
Cylinder Blocks 9.1%
Note:
The crankshaft analysis was based on a load of 7000 KW in lieu of 6000 KW due to availability of firing pressure data, therefore the % reduc tion shown is conservative.
As expected, the stresses are not directly proportional to load but the re ductions in stress due to the relatively low load rating provide additional margin.
C. L. Ray, Jr.
Technical Program Director TDI Diesel Generator Owners Group CLR/cr DUKE I MANAGEMENT AND POWER I TECHNICAL SERVICES