Protecting People and the EnvironmentUNITED STATES NUCLEAR REGULATORY COMMISSION
ACCESSION #: 9609230049
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ABB
ASEA BROWN BOVERI
September 17, 1996
Document Control Desk
U. S. Nuclear Regulatory Commission
Washington, DC 20555
Subject: Report of potential Deviation per 10CFR Part 21
ZPA Ratings for Class 1E Relays
Notification By: ABB Power T&D Company Inc.
Power Automation and Protection Division
4300 Coral Ridge Dr.
Coral Springs, FL 33065
This letter is a follow-up to our interim report issued July 12, 1996
describing evaluation of potential deviations in qualification
documentation for Class 1E relays.
On May 6-7, Yankee Atomic Electric Company conducted Surveillance Audit
96-066 at ABB Power T&D Company Inc. - Relay Division (now Power
Automation and Protection Division), Coral Springs, FL. This audit
resulted in a finding and recommendation to initiate an evaluation of
qualification documentation, and determine its impact on COM-5 Class 1E
relays, per 10CFR Part 21. After evaluation, a report was submitted to
Yankee Atomic June 11, 1996 identifying corrective actions that had been
taken and stating that in our judgment, there was no impact on the COM-5
relays being supplied.
A follow-up visit by Yankee Atomic took place on July 9-10, 1996 to
review these corrective actions. As a result of further discussions,
Yankee Atomic determined that the qualification documentation for the
COM-5 relay, as well as the CRN-1 and CVE-1 relays, was not sufficient.
In addition, inconsistencies in ZPA ratings were found.
Based on these occurrences, ABB has done an evaluation of the
qualification documentation for the above mentioned relays, as well as
all other Class 1E relays supplied. As a result of this evaluation, this
report is being issued to inform users of changes in ZPA (zero-period
acceleration) ratings for ABB (and formerly Westinghouse *) Class 1E
relays. This report describes changes in ZPA ratings due to the method
of analysis only. The design and functional performance of these relays
were not affected and did not change. Other than ZPA ratings, all other
qualification documentation evaluated was found to be accurate, and no
other discrepancies were found.
ABB Power T&D Company Inc.
Relay 4300 Coral Ridge DrIve Telephone: (305) 762-6700
Division Coral SprIngs, FL 33065 Telefax: (305)345-6320
September 17, 1996
Subject: Report of Potential Deviation per 10CFR Part 21
ZPA Ratings for Class 1E Relays
Refer to the multifrequency broadband Standard Response Spectrum (SRS)
shape in Figure 1. The former method of ZPA analysis was to draw the
straight-line SRS through the average of the lowest Test Response
Spectrum (TRS) curve. This was the standard practice prior to ANSI/IEEE
C37.98. The current method of analysis uses the definitions described in
C37.98-1987, section 5.2.1.1, where the TRS envelopes the SRS. This
produces a lower ZPA rating. Refer to the example curves in Figure 2.
The original method with the SRS drawn thought the average TRS produces
ZPA rating of 6.7 g while the current envelope method yields 5.7 g.
During the evaluation of the qualification documentation it was
determined that some of the ZPA ratings listed on the Certificates of
Conformance were not revised when the method of ZPA analysis changed.
Attached to a list of relays whose ZPA ratings changed, and the dates
that the certificates were revised.
Questions regarding information in this letter should be directed to the
Quality Manager at the ABB Power Automation and Protection Division at
800-523-2620, 954-752-6700, or fax 954-345-5329.
Cheryl A. Dahle Jose R. Gierbolini
Division Quality Manager Profit Center Manager
Electromechanical Relays
* ABB purchased the Relay Division (now the Power Protection and
Automation Division) from Westinghouse in 1990. In the Assets
Purchase Agreements, Westinghouse retained all liability for
products manufactured during the entire period of Westinghouse
ownership.
September 17, 1996
Attachment to Part 21 Letter
Subject: Report of Potential Deviation per 10CFR Part 21
ZPA Ratings for Class 1E Relays
Figure "Standard Response Spectrum (ANSI/IEEE C37.98-1987)" omitted.
September 17, 1996
Attachment to Part 21 Letter
Subject: Report of Potential Deviation per 10CFR Part 21
ZPA Ratings for Class 1E Relays
Figure "Test Response Spectrum Curves - Example of ZPA Analysis" omitted.
September 17, 1996
Attachment to Part 21 Letter
Subject: Report of Potential Deviation per 10CFR Part 21
ZPA Ratings for Class 1E Relays
Table "Relay Types and Revised ZPA Values" omitted.
GENERAL INFORMATION or OTHER EVENT NUMBER: 30753
LICENSEE: AESA BROWN BOVERI NOTIFICATION DATE: 07/15/96
CITY: CORAL SPRINGS REGION: 2 NOTIFICATION TIME: 13:19 [ET]
COUNTY: STATE: FL EVENT DATE: 07/15/96
LICENSE#: AGREEMENT: Y EVENT TIME: 00:00 [EDT]
DOCKET: LAST UPDATE DATE: 09/19/96
NOTIFICATIONS
NRC NOTIFIED BY: C. DAHLE V. HODGE NRR
HQ OPS OFFICER: BOB STRANSKY
EMERGENCY CLASS: NOT APPLICABLE
10 CFR SECTION:
CDEF 21.21(b)(2) DEFECTS/NONCOMPLIANCE
EVENT TEXT
10 CFR PART 21 REPORT REGARDING POTENTIAL DEVIATIONS IN QUALIFICATION
DOCUMENTATION FOR CLASS 1E RELAYS.
THE FOLLOWING IS TEXT FROM A FACSIMILE SUBMITTED BY THE VENDOR:
"ON MAY 6-7, YANKEE ATOMIC ENERGY COMPANY CONDUCTED SURVEILLANCE
AUDIT
96-066 AT ABB POWER T&D COMPANY INC. - RELAY DIVISION, CORAL SPRINGS,
FL.
THIS AUDIT RESULTED IN A FINDING AND RECOMMENDATION TO INITIATE AN
EVALUATION OF QUALIFICATION DOCUMENTATION, AND TO DETERMINE ITS
IMPACT ON
COM-5 CLASS 1E RELAYS, PER 10 CFR PART 21. AFTER EVALUATION, A REPORT
WAS SUBMITTED TO YANKEE ATOMIC JUNE 11, 1996 IDENTIFYING CORRECTIVE
ACTIONS THAT HAD BEEN TAKEN AND STATING THAT, IN OUR JUDGMENT,
THERE WAS
NO IMPACT ON THE COM-5 RELAYS BEING SUPPLIED.
"A FOLLOWUP VISIT BY YANKEE ATOMIC TOOK PLACE ON JULY 9-10, 1996, TO
REVIEW THESE CORRECTIVE ACTIONS. AS A RESULT OF FURTHER DISCUSSIONS,
YANKEE ATOMIC DETERMINED THAT THE QUALIFICATION DOCUMENTATION
FOR THE
COM-5 RELAY, AS WELL AS THE CRN-1 AND CVE-1 RELAYS, WAS NOT
SUFFICIENT.
IN ADDITION, INCONSISTENCIES IN ZPA RATINGS WERE FOUND.
"BASED ON THE ABOVE OCCURRENCES, ABB IS INITIATING AN EVALUATION OF
THE
QUALIFICATION DOCUMENTATION FOR THE ABOVE MENTIONED RELAYS, AS
WELL As
OTHER CLASS 1E RELAYS SUPPLIED. THIS EVALUATION WILL BE COMPLETED BY
AUGUST 30, 1996. BASED ON THE RESULTS OF THIS EVALUATION, WE WILL THEN
ISSUE A FINAL REPORT, PER 10 CFR PART 21.11
* * * UPDATE 0914 9/19/96 FROM DAHLE * * *
(Continued on next page)
LICENSEE: ASEA BROWN BOVERI PAGE # 2 OF EVENT NUMBER: 30753
THE VENDOR REPORTED THAT, AFTER FURTHER INVESTIGATION, CHANGES IN
ZPA
(ZERO-PERIOD ACCELERATION) RATINGS FOR ABB CLASS 1E RELAYS ARE
WARRANTED.
HOO NOTIFIED NRR (V. HODGE).
*** END OF DOCUMENT ***
