View source for W3P84-0416, Forwards Justification for Interim Operation for Borg-Warner Actuators for Valves 1SI-V 1501B & 1503A.Environ Qualification Expected by Time of Commercial Operation. Requests Review & Acceptance

{{Adams
| number = ML20088A602
| issue date = 04/09/1984
| title = Forwards Justification for Interim Operation for Borg-Warner Actuators for Valves 1SI-V 1501B & 1503A.Environ Qualification Expected by Time of Commercial Operation. Requests Review & Acceptance
| author name = Cook K
| author affiliation = LOUISIANA POWER &amp; LIGHT CO.
| addressee name = Knighton G
| addressee affiliation = NRC OFFICE OF NUCLEAR REACTOR REGULATION (NRR)
| docket = 05000382
| license number = 
| contact person = 
| document report number = W3P84-0416, W3P84-416, NUDOCS 8404120278
| document type = CORRESPONDENCE-LETTERS, INCOMING CORRESPONDENCE, UTILITY TO NRC
| page count = 3
}}

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LOUISIANA          142 ORAAONDE STREET POWER & LIGHT       P O BOX G008
* NEW ORLEANS. LOUISIANA 70174 = (504) 366 2345 wastan                         April 9, 1984 W3P84-0416 3-A20.16 Director of Nuclear Reactor Regulation Attention: Mr. G. W. Knighton, Chief Licensing Branch No. 3 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C. 20555

==SUBJECT:==
Waterford 3 SES Docket No. 50-382 Environmental Qualification -
Borg Warner Actuators

==Dear Sir:==

In accordance with 10CFR50.49(i), please find attached a Justification for Interim Operation for the Borg-Warner actuators for valves ISI-V 1501B and ISI-V 1503A. As discussed in the attached, we expect qualification to be complete by the time of commercial operation. We request that you review this JIO and provide your acceptance.
Very truly yours, K. W. Cook Nuc1 car Support
* Licensing Manager KWC/RMF/cb cc: C. L. Blake, W. M. Stevenson, J. T. Collins, D. M. Crutchfield, J. Wilson, H. Garg, G. L. Constable 8404120278 840409                                          b'h
[DRADOCK 05000382  PDR g

o JUSTIFICATION FOR INTERIM OPERATION BORC-WARNER PNEUMATIC-HYDPAULIC ACTUATOR MODEL PN 39400 FOR VALVES ISI-V1501B AND ISI-V1503A SAFETY FUNCTION The pneumatic-hydraulic actuators serve containment isolation valves in the Shutdown Cooling Line.
The isolation valves are normally closed and will be opened in the Shutdown Cooling Mode, and Long Term Recirculation Mode following a Small Line Break. In the Long Term Recirculation Mode the valves must open 16-24 hours after Small Line Break and remain open.
STATUS According to Borg-Warner's original schedule, testing was to be completed by July and the test report was due in August 1983. However, the test was postponed due to problems experienced with the Fyrquel 220 hydraulic fluid.
The results of hydraulic fluid evaluation testing at Borg-Warner showed that intensive hydrolization of the Fyrquel occurred at tha aging temperatures of 300* F. Based on this evaluation, the Fyrquel was changed to PA0 synthetic hydrocarbon hydraulic fluid which did not exhibit hydrolization reaction at the aging temperature.
Due to the change in fluids the testing was rescheduled for completion in February 1984. After successfully completing thermal aging, the piston seal rings failed during mechanical wear aging. The failure was attributed to the Buna-N material which was apparently incompatible with the hydraulic fluid.
Borg-Warner's corrent plan is to replace the PA0 with a silicon based fluid which is compatible with the seal materials. The rebuilt Piston / Cylinder Assembly will be thermally and mechanically re-aged and testing will continue with the reassembled actuator.
JUSTIFICATION We believe the following points provide reasonabic assurance of qualification for the intended use of the actuators.
o    All parts of the actuator except the hydraulic fluid successfully completed the 14-day aging test at 300* F.
e    Testing performed by the manufacturer of the silicon-based hydraulic fluid has shown the fluid to remain serviceable at temperatures up to 400* F, which is far greater than the post-accident temperature expected to be seen by the actuator.

t o    Successful perfornance of the actuator for 14 days at 300* F provides confidence that it will perform its safety function (enter shutdown cooling within 24 hours) during post-accident conditions (which exceed 300* F for less than the first 100 seconds of the accident) at least until commercial operation.
SCllEDULE The environmental qualification testing is ongoing and should be complete by commercial operation. The NRC will be notified if the testing schedule should slip beyond commercial operation.
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