ML13331A331
| ML13331A331 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 06/15/1989 |
| From: | Nandy F SOUTHERN CALIFORNIA EDISON CO. |
| To: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| IEB-88-003, IEB-88-3, NUDOCS 8906220144 | |
| Download: ML13331A331 (3) | |
Text
Southern California Edison Company P 0. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD. CALIFORNIA 91770 F. R. NANDY TELEPHONE MANAGER OF NUCLEAR LICENSING June 15, 1989 (818) 302-1896 U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V 1450 Maria Lane, Suite 210 Walnut Creek, CA 94596-5368 Attention: Mr. John B. Martin, Regional Administrator
Dear Sir:
Subject:
Docket No. 50-206 NRC Bulletin 88-03 San Onofre Nuclear Generating Station Unit 1
References:
- 1) NRC Bulletin 88-03, "Inadequate Latch Engagement in HFA Type Latching Relays Manufactured by General Electric (GE) Company,"
dated March 10, 1988 By Reference 1, the NRC requested that Southern California Edison (SCE) perform inspections of GE latching type HFA relays for inadequate latch engagement and insufficient latch spring tension.
SCE completed these actions during the Cycle 10 refueling outage.
Provided as an enclosure are the results of SCE's inspection of the GE latching type HFA relays installed in Unit 1.
Respectfully submitted, By:
F. R. Nandy Manager of Nuclear Licensing Subscribed and sworn to before me this 15th day of uinp 1989.
OFFICIAL Enclosure
-(
SCA'NI A.
6O~
SNOTARqP~C 896204 99061.
Notary Public in and for the' County of Los Angeles, State of California Endlosures cc:
U. S. Nuclear Regulatory Commission, Document Control Desk F. R. Huey, NRC Senior Resident Inspector, San Onofre Units 1, 2 and 3 83906220144 890815 PDR ADOCK 05000206 GPNU
RESPONSE TO NRC BULLETIN 88-03 A. SCE Report on GE Latching Type HFA Relay Inspections In accordance with the reporting requirements of this bulletin, the following data includes the model number of the latching relay inspected, the number of relays of each type inspected, the number of each type requiring replacement due to interference between the molded contact carrier and the top of the relay armature, and the number of each type requiring replacement due to insufficient spring tension on the latch.
As San Onofre Unit 1 was in a refueling outage, the relay data includes all the latching type relays installed in the plant. Spare relays stored in the warehouse and those installed at Units 2 and 3 have previously been inspected.
Summary of San Onofre Inspections Unit 1 Relay Inspections Relay Model....................................... 12HFA154E49F Quantity.......................................... 8 Passed Latch Interference Inspection........ 5 Failed Latch Interference Inspection........ 3 Passed Spring Tension Inspection............ 6 Failed Spring Tension Inspection........... 2 Failed Both Inspections...................
0 Relay Model....................................... 12HFA154E22F Quantity.......................................... 2 Passed Latch Interference Inspection........ 2 Passed Spring Tension Inspection........... 2 Replacement Relay Inspections Relay Model....................................... 12HFA154E49F Quantity.......................................... 5 Passed Latch Interference Inspection
....... 5 Passed Spring Tension Inspection........... 5
B.
SCE Report on Planned Inspections When Procuring Future GE HFA Relays In order to ensure future GE HFA relay spares are inspected prior to receipt and installation in the plant, SCE has placed additional checks into the procurement and spare parts process.
In the procurement process, a Verification Test Procedure has been incorporated into the Spare Parts Ordering requirements for GE HFA relays such that the manufacturer will perform their own recommended inspections and guarantee the product before delivery.
Because of the numerous problems with these relays, SCE has added the subject relays to the Control of Problem Equipment Program to ensure that Type 12HFA relays receive close scrutiny by SCE cognizant organizations prior to installation in the plant.
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