United States Nuclear Regulatory Commission - Protecting People and the Environment

ACCESSION #: 9510300253

Commonwealth Edison Company
1400 Opus Place
Downers Grove, IL  60515
                                                       ComEd

October 23, 1995


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 Final 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 August 23, 1995, "10 CFR Part 21
                    Interim Report 95-007 ComEd Amerace E7000 Series
                    Relay Timers May Be Used in Unqualified
                    Configurations."

          (2)       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).

k:dave:finalame:1
               A Unicom Company


U. S. NRC                        - 2 -                   October 23, 1995

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 all 6 ComEd nuclear generating stations.

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 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.  A second
interim notification of 10CFR21 potential reportability was made to the
NRC on August 23, 1995.  This letter provides the final 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.

k:dave:finalame:2


U. S. NRC                         - 3 -                October 23, 1995

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 determined that the information transmitted
from Amerace regarding the contact rating may not have been sufficiently
substantiated.  The "make" ratings, according to Southern California
Edison, were not directly tested for maximum rating, but the contacts
were tested at 1 amp switching applications.  Since there appeared to be
discrepant information regarding the ratings, ComEd pursued testing the
relay contacts to demonstrate the capability of the contacts.  This
testing provided sufficient information to allow an appropriate 10CFR21
reportability determination ComEd has been able to fully disposition all
potentially affected applications at Zion, LaSalle, Byron, Braidwood,
Dresden and Quad Cities.

10 CFR 21 Evaluation

The evaluations of all applications at ComEd have been completed.  No
applications have been determined to meet the reportability requirements
of 10 CFR Part 21 and no safety significance exists.

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. Johnson
Licensing Operations Director

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

k:dave:finalame:3


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