United States Nuclear Regulatory Commission - Protecting People and the Environment

ACCESSION #: 9508280137

     Commonwealth Edison Company
     1400 Opus Place
     Downers Grove, IL 60515

August 23, 1995                                                     ComEd

U.S.  Nuclear Regulatory Commission
Washington, DC 20555

Attention: Document Control Desk

Subject:  Braidwood Station Units 1 and 2
          Byron Station Units 1 and 2
          Dresden Station Units 2, and 3
          LaSalle County Station Units 1 and 2
          Quad Cities Station Units 1 and 2
          Zion Station Units 1 and 2

          10 CFR Part 21 Second Interim Report 95-007
          ComEd Amerace E7000 Series Relay Timers May
          Be Used in Unqualified Configurations

          NRC Dockets 50-456 and 50-457
          NRC Dockets 50-454 and 50-455
          NRC Dockets 50-237 and 50-249
          NRC Dockets 50-373 and 50-374
          NRC Dockets 50-254 and 50-265
          NRC Dockets 50-295 and 50-304

Reference: (1) ComEd letter dated June 21, 1995, "10 CFR Part 21 Interim
               Report 95-007 ComEd Amerace E7000 Series Relay Timers May
               Be Used in Unqualified Configurations"

Applicability

This notification is submitted in accordance with the requirements of 10
CFR Part 21.  Section 21.21(a)(2).

Identification of Facilities and Components

Byron Nuclear Generating Station Units 1 and 2
Braidwood Nuclear Generating Station Units 1 and 2
Dresden Nuclear Generating Station Units 2 and 3
LaSalle Nuclear Generating Station Units 1 and 2
Quad Cities Nuclear Generating Station Units 1 and 2
Zion Nuclear Generating Station Units 1 and 2

Amerace E7000 Series Relay Timers used in various safety related
applications at 6 ComEd nuclear generating stations

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               A Unicom Company

Document Control Desk             (2)                     August 23, 1995

Identification of Component Manufacturer/Supplier

Amerace Electronic Components
7474 Utilities Road
Punta Gorda, FL 333982

Nature of Defect

The defect is related to a notification from Amerace of a reduction in
contact rating for Amerace's E7000 Series relay timers.  The published
rating was reduced for circuits serving loads rated at 1.0 amp at 125
VDC.  The new rating is 0.5 amps at 125 VDC.  Amerace requested that
ComEd review any DC applications with the E7000 series timer that may be
required to switch 125 VDC at 1.0 amp.  Amerace indicated that, per test
data, the fragility level of the contact blocks was determined to be
between 0.68 amps and 0.71 amps at 125 VDC.

Time of Discovery

Commonwealth Edison Company first determined that the potential
misapplication of the Amerace E7000 relays could potentially adversely
affect safety related equipment and that the defect could be reportable
per 10CFR21 on April 25, 1995.  An interim notification of 10CFR21
potential reportability was made to the NRC on June 21, 1995.  This
letter provides additional information concerning the status of ComEd's
10CFR21 evaluation.

Number and Location of All Defective Components:

The Amerace relay timers are used in various safety related applications
at all six ComEd sites. The approximate applications range from 24 at
LaSalle Station , 33 at Quad Cities, 93 at Dresden, 55 at Zion, to 250 at
Byron and Braidwood Stations.

Corrective Actions:

Conversations were held with the vendor (Amerace) and Southern California
Edison (utility who performed the original testing which determined the
new contact ratings).  ComEd has determined that the information
transmitted from Amerace regarding the contact rating may not be
sufficiently substantiated.  The "make" ratings, according to Southern
California Edison, were not directly tested for maximum rating, but the
contacts were tested at I amp switching applications.  Since there
appears to be discrepant information regarding the ratings, ComEd has not
been able to fully disposition all of the applications at four (4) of our
stations, Byron, Braidwood, Dresden, and Quad Cities.  ComEd will pursue
testing the relay contacts to demonstrate the capability of the contacts.
This testing will provide sufficient information to allow an appropriate
10CFR21 reportability determination.

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Document Control Desk             (3)                     August 23, 1995

To date, ComEd has been able to fully disposition all potentially
affected applications at Zion and LaSalle, 97 of the 141 at
Byron/Braidwood, 83 of the 93 at Dresden and 27 of the 33 at Quad Cities.
For the remaining potentially affected applications, 44 at
Byron/Braidwood, 10 at Dresden and 6 at Quad Cities, CornEd will pursue
further evaluation and testing to demostrate the capability of the
contacts at the existing plant configurations.  In the interim, ComEd has
determined, based on past operations of the relay contacts as well as
past failure history of the relay contacts, that the remaining affected
relay contacts do not pose a substantial safety hazard.

10 CFR 21 Evaluation

At this time, the ComEd review indicates that there is a potential 10 CFR
Part 21 notification related to the Amerace E7000 series relay timers.
To date, no applications have been determined to meet the reportability
requirements of 10 CFR Part 21.  However, the evaluation of all
applications at CornEd has not been completed.  It is estimated that this
evaluation will be completed for all sites by 10/23/95.

Contacts

Questions Pertaining to this notification should be addressed to:

Eric S. Steckhan
Nuclear Engineering Services
ComEd
1400 Opus Place, Suite 300
Downers Grove, IL 60515
(708) 663-7437

Sincerely,

I. M. John
Licensing Operations Director
Nuclear Regulatory Services

cc:  H.  Miller, Regional Administrator-RIII
     G.  Dick, CornEd Generic Issues Project Manager, NRR
     S.  Ray, Senior Resident Inspector (Braidwood)
     H.  Peterson, Senior Resident Inspector (Byron)
     M.  Leach, Senior Resident Inspector (Dresden)
     P.  Brochman, Senior Resident Inspector (LaSalle)
     C.  Miller, Senior Resident Inspector (Quad Cities)
     R.  Roton, Senior Resident Inspector (Zion)

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