ML20115C895
| ML20115C895 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 02/10/1984 |
| From: | Root R WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| GO1-84-0051, GO1-84-51, NUDOCS 8504180612 | |
| Download: ML20115C895 (3) | |
Text
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Q Washington Public Power Supply System P.O. Box 968 3000 GeorgeWashington Way Richland, Washington 99352 (509)372-5000 February 10, 1984 Responds to:
G01-84-0051 Response required by:
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Mr. J.B'. Martin.
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Regional Administrator =
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g Region V 1450 Maria Lane, Suite 210 7
Walnut Creek, CA 945%
Subject:
NUCLEAR PROJECTS 1 & 4 DOCKET NOS. 50-460 AND 50-513 P0TENTIALLY REPORTABLE CONDITION 10CFR50.55(e)
GENERAL ELECTRIC RELAYS
Reference:
- 1) Telecon, C.R.-Edwards, Supply System to D.P. Haist, NRC, 2/1/84
- 2) IE Notices 81-01 & 82-13 In reference 1 we reported that as a followup to reference 2, we have determined at this time that we have at least nine (9) General Electric type HFA relays with potential manufacturing defects described in reference 2.
Our investigation associated with these notices is not complete at this time. Also, we have expanded our investigation as a result of receiving a copy of reportable event #296 from our WNP-2 facility which describes potential defects in the ' newer General Electric
" Century" type relays. These relays are recommended in reference 2 as replacements for the ' older models that have Lexan and Nylon coil bobbins.
The potentially defective HFA relays are used in our DC switchgear and perform various control and interlock functions whose failure could affect the safe operation of the facility. Therefore this condition is considered reportable under the requirements of.10CFR50.55(e).
We have elected to replace all suspect General Electric HFA (and other HFX) relays with an approved model rather than attempt to justify their use.
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Attachment A provides a brief description of our interim investigation and our planned corrective actions.
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q)h Because of our present construction delay, we will. provide an updated report on our
' findings and corrective actions'at restart..
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R.W. Root, Program Director WNP-1 RWR/ GAB /cmh Attachment
-cc:.TA Mangelsdorf, BPC (861)
V Mani, UE&C (897)
Document Control Desk, NRC G Haren,'UE&C (895)
FDCC (899)
~ORM (857)
RS Goldstein, UE&C (898)
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ATTACHENT A DOCKET N05. 50-460 AND 50-513 DESCRIPTION OF DEFICIENCY
~ Potential failures of nylon and lexan relay coil bobbins in General Electric HFA, HKA & HMA Relays as described in Inspection and Enforcement (IE) Notices 81-01 and 82-13.
ANALYSIS OF SAFETY IMPLICATION Preliminary evaluation has determined that the Supply System has at least nine (9) of the suspect relays (type HFA) installed in safety-related DC Switchgear.
Failures of the relays in the modes described in the referenced Notices could prevent the DC Switchgear from performing its safety function.
Therefore, this condition is considered reportable.
CAUSE OF DEFICIENCY Manufacturing & design (material application) deficiencies of the General Electric relays identified in the reference notices.
CORRECTIVE ACTION Safety related electrical equipment bills of material were searched for use of subject relays and vendors were polled to assist in identification of whe' e the r
subject relays were used.
Each relay of the subject type was inspected for the appropriate manufacturing date code.
Those relays manufactured in the time frame of concern were identified for replacement.
Nonconformance report, 1-BNCP.-100-01, was issued to record the deficiency in the DC Switchgear.
Additional BNCR's will be processed if additional potentially defective relays are identified during our continuing investigation.
All equipment that might have had defective relays (as defined by the referenced Notices) has either been delivered to the site where we have inspected it, or is in the manufacture's shop where he has inspected it at our request.
We suspect, but have not yet confirmed, that both delivered and undelivered equipment may contain the newer " Century" series relays.
We have just begun our investigation into this aspect and have not yet comunicated with our equipment vendors on this matter.
Our corrective action to resolve this later development will be included in a future report.
We will not purchue the recommended replacement relays (" Century" series) for installation on site until we have assurances from the supplier (General Electric) that the manufacturing (assembly) deficiencies identified by WNP-2 in reportable condition #296 have been resolved.
Due to the -construction status of WNP-1/4, we will provide an update report at construction restart.
ACTION TO PREVENT RE0CURRENCE Supply System is developing a list of " Restricted Components" to ensure exclusion of subject relays in future procurements.
Further, depending on the resolution of the WNP-2 reportable event, we may elect to either replace or disassemble and rework any " Century" series relays if we find we have any in our equipment.