Part 21 Report - 1996-781
ACCESSION #: 9701090070
Farewell & Hendricks, Inc.
January 2, 1997
Document Control Desk
United States Nuclear Regulatory Commission
Washington, D.C. 20555
via Operations Center
Telephone #: (301) 816-5100
Telecopy #: (301) 816-5151
Subject: Written Notification of a Known Defect Per 10CFR21
Dear Sir or Madam:
This written notification of a known defect is per Farwell & Hendricks,
Inc. (F&H) commitment contained in F&H's original fascimile notification
dated November 1, 1996 except that this letter was delayed in order to
incorporate the customers Root Cause Analysis. This written notification
(report) is in accordance with 10CFR21, Section 21.21, Paragraph 3 (ii).
The following written notification (report) is formatted per 10CFR21,
Section 21.21, Paragraph 4:
i. F&H at the address listed below is the organization informing
the USNRC. John R. Hendricks, F&H Corporate Officer, of the
same address, is the specific individual informing the USNRC.
ii. The basic components supplied by F&H which contained the
defects are MSD (Struthers & Dunn) B255 relays with DC coils.
The identification of the specific facilities to which F&H
supplied these relays is Public Service Gas & Electric Company
(PSE&G).
iii. F&H is the identification of the firm that supplied the basic
component listed above.
iv. The nature of the defects occur as:
1) Becoming unlatched without the reset coil being
energized
2) Failure to latch upon demand
F&H has determined that the reported failures was neither a
qualification or dedication issue in that the relays satisfied
the seismic qualification requirements as well as mild
environmental conditions for the previously qualified
orientations.
The defect condition of becoming "unlatched without the reset
coil being energized", once a relay has achieved a latched
condition, can only occur by means of an external force being
applied to the relay, such as vibration or impact. The
mechanism's primary means of staying latched is the reset
coil's return spring. A lesser contribution is made by the
coefficient of friction between the latch and the armature of
the set/activate coil. Since this version of the relay has
passed PSE&G's seismic levels, the unidentified outside force
must be outside the seismic levels' force and/or frequency
qualification levels.
The second defect which has subsequently been identified with
these relays was a failure to latch (or unlatch) when power is
applied to the appropriate coil. PSE&G's concerns have been
addressed by performing refurbishment activities as well as OEM
design changes which replaces the reset coil's return spring
(to improve resistance to the force described in defect #1),
and use a screening process (with PSE&G's concurrence) in order
to address the second defect and optimize for success. (See
PSE&G's Specification No. S-C-RCP-EDS-0343 Revision 0 dated
11/11/96 for further details.) In addition, relays purchased
new from MSD will have a different reset coil in order to make
the relay easier to manufacture.
4600 East Tech Drive o Cincinnati, Ohio 45245 o (513) 528-7900 o
FAX (513) 528-9292
F&H is unable to evaluate the safety hazard which could be
created by the defect as the potential effect is application
specific.
v. The date on which the information of the defect was obtained
and determined to be a generic issue was October 31, 1996.
However, our customer was providing F&H with a Root-Cause
Analysis which was received at F&H on December 30,1996.
vi. Our records indicate that these basic components have only been
sold to PSE&G.
vii. The corrective action taken by F&H was to notify PSE&G and
begin working with PS&G and MSD in order to implement a
refurbishment activity which modifies previously sold relays as
well as to implement design changes at MSD for future
manufacturing of these devices. The length of time to complete
the refurbishment activity cannot be defined by F&H, however
the refurbishment of these relays is currently in process.
iv. The advice related to the defect that will be given to the
purchasers is that the evaluation indicates that all MSD
(Struthers & Dunn) B255 relays with DC coils manufactured prior
to November 25, 1996 and supplied by MSD either directly or via
third party dedicators may also contain the defect described in
iv above.
Please note that F&H has reviewed PSEG's "Root Cause Analysis of
Struthers-Dunn Operate-Reset Relay Latch Failures for Salem Nuclear
Generation Station" dated December 6, 1996 (Attached). F&H has also
reviewed the Struthers-Dunn Model 255XCXP Relay Root Cause Evaluation..."
(also Attached) but does not consider it completely germane. The bulk of
the discussion compares the A255 Series with the B255 Series and the
similarly between them. However, F&H has never qualified the A255 Series
and did not reference the A255 Series in either the Qualification or
dedication activities.
Written By:
Mike Wooldridge Roy A. Woeste
Engineering Manager Quality Assurance
John R. Hendricks, P. E.
President
CC: Tom Mahaffey, MSD
Craig Bersak, PSE&G
Attachments:
F&H's Notification of a Potential Defect per 10CFR21
PSE&G's Root Cause Analysis ... Condition Reports CR960906195,
CR961101269, CR961105229
PSE&G's ... Root Cause Evaluation FPI 96-829
PSE&G's Specification No. S-C-RCP-CDS-0343
Farewell & Hendricks, Inc.
November 1, 1996
Document Control Desk
United States Nuclear Regulatory Commission
Washington, D.C. 20555
via Operations Center
Telephone #: (301) 816-5100
Telecopy #: (310) 816-5151
Subject: NOTIFICATION OF A POTENTIAL DEFECT PER 10CFR21
Dear Sir of Madam:
This facsimile notification of a potential defect is in accordance with
10CFR21, Section 21.21, Paragraph 3(i).
The following initial information is formatted per 10CFR21, Section
21.21, Paragraph 4:
i. Farwell & Hendricks, Inc. (F&H) at the address listed
below is the organization informing the USNRC. John R.
Hendricks, F&H Corporate Officer, of the same address is
the specific individual informing the USNRC.
ii. The basic components supplied by F&H which contains the
defect are MSD B255 latching relays with a DC unlatching
coil. The identification of the specific facilities to
which F&H supplied these relays is not fully compiled at
this time. The specific facilities will be provided in a
detailed report within the thirty (30) days as specified
by 10CFR21, Section 21.21, Paragraph 3(ii).
iii. F&H is the identification of the firm that supplied the
basic component described above.
iv. The nature of the defect is that the relay becomes
unlatched without the reset coil being energized. PSE&G
has identified eight (8) installed occurrences, all of
which occurred in the "floor mounted" orientation. This
defect was detected using standard bench testing practice.
Note that this defect could also occur in the wall mounted
orientation.
F&H is unable to evaluate the safety hazard which could be
created by the defect as the potential effect is
application specific.
v. The date on which the information of the defect was
obtained and determined to be a generic issue was October
31, 1996. An evaluation will be provided in the detailed
report within the specified thirty (30) days.
4600 East Tech Drive o Cincinnati, Ohio 45245 o (513) 528-7900
FAX (513) 528-9292
Page 2
vi. The specific number and specific site locations of all
such devices supplied by F&H are not fully compiled at
this time. This information will be provided in the
detailed report within the specified thirty (30) days.
vii. The corrective action to be taken by F&H is to notify all
purchasers of such devices within thirty (30) days.
Further corrective action to be taken, the responsible
organization(s) and the length of time to complete the
action cannot be defined by F&H at this time.
viii. Advice related to the defect that will be given to the
purchasers is that the evaluation indicates that all B255
style relays with DC unlatch coils previously supplied
commercially by MSD may also contain the defect described
in iv. Above.
F&H will be providing a written report to the USNRC within thirty (30)
days as specified by 10CFR21. The USNRC will receive the report NO LATER
THAN NOVEMBER 29, 1996.
Written By:
Mike Wooldridge
Engineering Manager
Roy A. Woeste
Quality Assurance
Reviewed and Reported By:
John R. Hendricks, P. E.
President
Farewell & Hendricks, Inc.
4600 East Tech Drive
Cincinnati, Ohio 45245
Telephone #: (513) 528-7900
Telecopy #: (513) 528-9292
cc: Tom McHaffey, MSD
Craig Bersak, PSE&G
*** END OF DOCUMENT ***
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