ML13316A031
| ML13316A031 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 12/27/1988 |
| From: | Medford M SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| REF-PT21-88, REF-PT21-88-158-000 PT21-88-158, PT21-88-158-000, NUDOCS 8901030143 | |
| Download: ML13316A031 (3) | |
Text
Southern California Edison Company P. 0. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD. CALIFORNIA 91770 M.O.MEDFORD TELEPHONE MANAGER OF December 27, 1988 (818)302-1749 NUCLEAR REGULATORY AFFAIRS U. S. Nuclear Regulatory Commission Attention:
Document Control Desk Washington, D.C. 20555 Gentlemen:
Subject:
Docket No. 50-206 Imo Delaval 10 CFR 21 Reports Standby Diesel Generators San Onofre Nuclear Generating Station Unit 1
References:
A) Letter from 3. A. Zwolinski (NRC) to K. P. Baskin (SCE),
dated June 17, 1985, Transamerica Delaval, Inc. (TDI)
Diesel Generators - Recent 10 CFR Part 21 Reports from TDI B) Letter from M. 0. Medford (SCE) to NRC, dated November 4, 1987, Imo Delaval 10 CFR 21 Reports In accordance with Reference A, enclosed for your information is the latest update of actions taken by Southern California Edison (SCE) in response to 10 CFR 21 notifications from Imo Delaval, Inc. (formerly TDI), regarding problems potentially applicable to the San Onofre Unit 1 standby diesel generators.
Our previous update was submitted to the NRC by Reference B.
If you have any questions, please let me know.
Very truly yours, Enclosure cc:
C. M. Trammell, NRR Project Manager, San Onofre Unit 1 J. B. Martin, Regional Administrator, NRC Region V F. R. Huey, NRC Senior Resident Inspector, San Onofre Units 1, 2 and 3 890103014:3 881227 PDR ADOCK 05000206
.S PDC:
TABLE SHOWING SCE'S ACTIONS RELATIVE TO RECENT IMO DELAVAL (TDI) 10 CFR 21 REPORTS Date of Potential Problem, SCE's Actions to Assess 10 CFR 21 Causes and Imo Delaval If Potential Problem Corrective Actions and Report (TDI)'s Recommendation Exists at San Onofre Unit 1 Implementation Schedules 12/3/87 A defect was found in the diesel Both standby diesel None needed.
generator wound rotor poles generators were inspected manufactured by NEI Peebles-by SCE to manufacturer's Electric Products, Inc., and criteria during the 1988 mid supplied to Gulf States cycle outage for possible Utilities through Imo Delaval.
rotor pole damage. No Root cause of failure was not abnormalities were found.
known. Delaval recommended visual inspection of generator rotor poles for damage.
4/29/88 A potential problem exists A search for the suspect The six suspect components with certain engine control components was conducted were returned to Imo Delaval devices in the air start, in the spare parts for inspection and testing.
lube oil, jacket water and inventory on site.
Six crankcase systems of diesel suspect components were All installed components that generators, which may render located.
are the subject of this report the diesel generator inoperable.
have been identified and are The suspect devices were covered by site preventive manufactured by California maintenance/surveillance Controls (Calcon).
Imo Delaval programs.
traced the problem to a lack of product testing by the 0
manufacturer. Imo Delaval recommended that (a) all suspect components that are in on-site storage be returned to Imo Delaval for inspection and testing and (b) all suspect components that are already installed be covered by a surveillance plan within the operating/ maintenance program for the site.
TABLE SHOWING SCE'S ACTIONS RELATIVE TO RECENT IMO DELAVAL (TDI) 10 CFR 21 REPORTS Date of Potential Problem, SCE's Actions to Assess 10 CFR 21 Causes and Imo Delaval If Potential Problem Corrective Actions and Report (TDI)'s Recommendation Exists at San Onofre Unit 1 Implementation Schedules 5/12/88 This supplemental information Spare parts inventory was The two suspect parts were (Addendum 1 addresses a specific component, checked for subject part returned to Imo Delaval for to 4/29/88 the pressure sensor/lube oil no. F-573-156.
Two parts remachining, inspection and report) trip (F-573-156) manufactured with this number were located, testing.
by Calcon. Inadequate spacing between a pressure head and a diaphragm causes the diaphragm The installed parts (five to be held solid against the per diesel) have demonstrated pressure head and the unit to their reliability by fail.
However, several hours operating for several hours are needed between tests for the between tests and for this diaphragm to stretch and seat reason they do not require itself against the pressure corrective action.
head before failure would occur.
Imo Delaval recommended that all devices not installed, or those that are installed but have not operated for several hours between tests, be returned to Imo Delaval from remachining, inspection and testing. Devices that are already installed and operating after several hours between tests have demonstrated their reliability.
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