ML20116H808
| ML20116H808 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/29/1985 |
| From: | Hukill H GENERAL PUBLIC UTILITIES CORP. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20116H812 | List: |
| References | |
| 5211-85-2057, NUDOCS 8505020364 | |
| Download: ML20116H808 (1) | |
Text
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r GPU Nuclear Corporation Nuclear
- =,ome:reo s
Middletown, Pennsylvania 17057-0191 717 944 7621 TELEX 84 2386 April 29, 1985 Writer's Direct Dial Number:
5211-85-2057 Office of Nuclear Reactor Regulation Attn:
J. F. Stolz, Chief Operating Reactors Branch No. 4 U.S. Nuclear Regulatory Commission Washington, D. C.
20555
Dear Mr. Stolz:
Three Mile Island Nuclear Generating Station Unit 1 (TMI-1)
Operating License No. DPR-50 Docket No. 50-289 EFW Long Term Mods In response to the second portion of your letter of June 21, 1984, enclosed is a system description entitled "EFW System Upgrade to Safety Grade Design" which describes how the design criteria of our August 23, 1983 letter (5211-83-2232) will be implemented. On August 6, 1984 and February 19, 1985, GPUN sent the drawings listed in the back of Enclosure 1 which contained detailed schematics of the EFW long term modification.
By letter dated October 3, 1984 (5211-84-2244), GPUN provided a schedule for the installation of the NUREG 0737 Item II.E.1.1 modifications.
Included with this discussion was the replacement of the MS/MFW delta P signal with a safety grade high containment pressure signal.
Additionally, the main steam line rupture detection system (MSLRDS) will be safety grade to the extent possible since feedwater valves (FW-VSA, 92A,16A &
17A) are located in the Turbine Building which is a non-seismic structure.
The Intermediate Building (Alligator Pit) flooding alarm is being installed as a control grade modification using class 1E components.
These monitors will be environmentally qualified for a Feedwater Line Break in the Intermediate Building. They will not be qualified for submergence since they will have performed their alarm function prior to submergence of any electrical component in this system. Based on the above, the submittal of detailed design information requested in your June 21, 1984 letter is considered complete.
Sincerely,
. H kill Director TMI-1 HDH/SM0/lr/0586e 850502036 $Q$289 ADOC PDR I
I cc:
J. Thoma, R. Conte gDR GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation
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