ML20087P868
| ML20087P868 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/26/1984 |
| From: | Baxter T GENERAL PUBLIC UTILITIES CORP., SHAW, PITTMAN, POTTS & TROWBRIDGE |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20086S331 | List: |
| References | |
| NUDOCS 8404090449 | |
| Download: ML20087P868 (2) | |
Text
5 March 26, 1984 v
UNITED STATES OF thtfERICA NUCLEAR REGULATORY COMMISSION BEFORETHEDIRECTOROFNUMANEkC EGULATION CFi iC Of Sl*# *
~
In the Matter of 00CP$1su & SEiWID-
) RANCH GPU NUCLEAR CORPORATION
)
Docket No. 50-289
)
(Three Mile Island Nuclear
)
Station, Unit No. 1)
)
LICENSEE'S AMENDED RESPONSE TO UNION OF CONCERNED SCIENTISTS' PETITION FOR SHOW CAUSE CONCERNING TMI-l EMERGENCY FEEDWATER SYSTEM On January 20, 1984, the Sr.;on of Concerned Scientists' filed a Petition for Show Cause Concerning TMI-l Emergency Feedwater System.
Licensee filed its response to the UCS petition on February 24, 1984.
This amendment is necessary to reflect factual developments which have occurred since February 24, 1984, with respect to matters addressed in Licensee's response.
Addres3ing issues raised on the environmental qualifi-cation of the TMI-l EFW system, Licensee reported that qualification of that system would be completed by June, 1984, with the exception of one piece of equipment.
Since no quali-fication testing basis is available to show that the E/P con-verters for the EFW control valves will survive a high energy line break in the Intermediate Building, Licensee stated that a decision had been made to replace the E/P converters with qualified I/P converters.
A justification for continued operation was provided.
Licensee's Response at 17; Attached GPU Nuclear Technical Response at 4-5.
8404090449 840406 PDR ADOCK 05000289 G
. 's Licensee has continued to work, however, on improving the schedule for implementing this modification.
Licensee has now determined that the E/P converters will be replaced with qualified I/P converters by June, 1984.
As a result of this change, the failure mode of the EFW flow control valves will be modified prior to restart such that, upon loss of control power, the valves will fail in the open position.
(Previously, the valves would have failed to the mid-position on loss of signal.)
For convenience, a replacement page 17 of Licensee's Response is attached, along with a Revision of the GPU 1
Nuclear Technical Response, with the changes identified by asterisks in the margin.
Respectfully submitted, SHAW, PITTMAN, POTTS & TROWBRIDGE George F.
Trowbridge, P.C.
Thomas A. Baxter, P.C.
David R. Lewis 1800 M Street, N.W.
Washington, D.C.
20036 (202) 822-1000 Counsel for Licensee Dated:
March 26, 1984 r