Part 21 Report - 1997-201
ACCESSION #: 9703170140
ENERTECH Solutions for Today., Standards for Tomorrow
(714) 528-2301
2950 Birch Street, Brea, CA 92821-8235
March 12, 1997 FAX (714) 528-0128
Nuclear Regulatory commission
Operations Center
Washington, DC 20555
RE: Follow-up Notification of a potential spring problem in a Bettis
Actuator. The Spring is P/N 015895 - installed in Bettis Actuator
Model NT312-SP4-M3-S, Serial Numbers 1 and 2. Location is at St.
Lucie Facility of Florida Power and Light. The tag numbers and
system installation is 1-HVC-14-3 A and B.
On March 7, 1997 Bettis Actuators and Controls of Waller, TX, submitted
to the NRC Operations Center a 10CFR Part 21 report. Whereas in that
report, a potential deviation or non conformance condition exists in a
basic component that is reportable under Part 21 as guidelines. The
basic component is identified as a Safety Related spring p/n 015895
supplied by Bettis. Bettis identified Enertech as having one order using
the suspect batch of springs. Enertech has identified the Bettis order
the springs were installed in applies only to the above stated
application. Enertech has informed Florida Power and Light St. Lucie
site in regards to this concern. Enertech does not believe this
situation is an immediate concern that require emergency actions.
The Bettis notification states this to be isolated repair of one actuator
for a commercial account. The notification states the above referenced
actuator serial numbers have springs installed that were part of the same
batch from the commercial application that contained a material defect.
The actuator was installed in a high cycle commercial application, where
it cycled approximately (15) fifteen times a day and had been in service
sure approximately 1987. This conservatively calculates to approximately
34,000 cycles in its life.
Enertech has evaluated the notification by Bettis and available data, and
concluded the following. These (2) two actuators have a (5) five year or
650 stroke refurbishment cycle per the manufacturers recommendations.
The worst case duty cycle of the St. Lucie actuators would calculate to
approximately 1,300 total cycles, far below the commercial application.
The next scheduled refurbishment cycle is due in 1998. Due to these
factors, Enertech is recommending Florida Power and Light include in
their next scheduled refurbishment cycle of the two actuators
replacement of the springs as a precautionary measure. The function of
the actuator is solely based on the ability of the spring to perform its
function on demand. For this reason Enertech believes it is prudent to
replace the springs at the next refurbishment cycle.
If you have questions of need additional information, Please contact me
at your convenience at Enertech (714) 528-2301 extension 200.
Sincerely,
Frank U. Erlack
President
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