ML20153F869
| ML20153F869 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 08/22/1988 |
| From: | Medford M SOUTHERN CALIFORNIA EDISON CO. |
| To: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| IEB-88-003, IEB-88-3, NUDOCS 8809070519 | |
| Download: ML20153F869 (3) | |
Text
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RECElVECs 3
REGI N V Southem Califomia Edison Company
'38 EG 23 Pl2. 23 2244 WALNUT GROVE AVENUE ROSEMEAD. C ALFORNIA 91770 ww.u."ori. "y',.{g" e.u a.
,y August 22, 1988 U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V 1450 Maria Lane, Suite 210 Halnut Creek, CA 94596-5368 Attention: Mr. John 8. Martin, Regional Administrator
Dear Sir:
Subject:
Docket No. 50-362 San Onofre Nuclear Generating Station Unit 3
..eferences:
- 1) NRC Bulletin 88-03, "Inadequate Latch Engagement in HFA Type Latching Relays Manufactured by General Electric (GE)
Company " dated March 10, 1988 r
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 that are installed in the plant and in spares. SCE was requested to complete the actions described in reference I no later than restart from the next plant refueling outage.
Provided as an enclosure are the results of SC~'s inspection of the GE latching type HFA relays installed in Unit 3 and in spare parts.
Respectfully submitted, b
b eso9070519BBg$62 By:
PDR ADOCK O PNV H. O. Medford //
o Manager of Nuclear Engineering and Licensing l
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I.V4 "LOS ANWS COUNW Notary Public idan'd for the County of i
Los Angeles, State of California L
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U. S. Nuclear Regulatory Commission. Document Control Desk I
F. R. Huey, NRC Senior Resident Inspector, SONGS 1, 2 and 3
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RESPONSE TO NRC BULLETIN 88-03 A.
SCE Reoort on GE Latchina Tvoe HFA Relav Insoections 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 corrective actions due to interference between the molded contact carrier and the top of the relay armature, and the number of each type requiring corrective action due to insufficient spring tension on the latch. As San Onofre Unit 3 was in a refueling outage, the relay data includes all the latching type relays installed in the plant.
In addition, the relays common to Units 2 and 3 were included due to special bus outages. Spare relays in the warehouse were also inspected.
Summary of San Onofre Insoections Unit 3 Relav Insoections Relay Model...................................................
12HFA154E22H Quantity......................................................
8 Passed Latch Interference Inspection.....................
8 Passed Spring Tension Inspection.........................
8 Unit 2 Relav Insoettions Relay Model...................................................
12HFA154E22H Quantity......................................................
2 Passed Latch Interference Inspection....................
2 Passed Spring Tension Inspection.........................
2 Spare Relay Insoections Relay Model...................................................
12HFA154E22H Quantity......................................................
3 Passed Latch Interference Inspection.....................
2 Failed Latch Interference Inspection.....................
1 Passed Spring Tension Inspection.........................
1 Fai l ed Spri ng Tension Inspec tion.........................
2 Failed Both Inspections..................................
0 4
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RESPONSE TO NRC BULLETIN 88-03 Page 2 of 2 Relay Model...................................................
12HFA154E49H Quantity......................................................
3 Passed Latch Interference Inspection.....................
3 Passed Spring Tension Inspection.........................
3 f
Relay Model...................................................
12HFA154E25H Quantity......................................................
2 Passed Latch Interference Inspection.....................
2 Passed Spring Tension Inspection.........................
1 Failed Spring Tension Inspection.........................
1 t
8.
SCE Recort on Planned Insoections When Procurina 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 i
process, the spare parts purchase order requires the manufacturer of GE HFA relays to perform their own recommended inspections and guarantee the product before delivery. SCE further tests spare GE HFA relays
(
following Station receipt by performance of a Verification Test Procedure to ensure compliance with the requirements of NRC Bulletin 88-03.
Because of the numerous problems with these relays SCE has added the t
subject relays to the Control of Problem Equipment program to ensure that l
Type 12HFA relays receive close scrutiny by SCE cognizant organizations
~
prior to installation in the plant.
skn/88NH029:9866F I
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