ML20211F764
| ML20211F764 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 10/22/1986 |
| From: | Hukill H GENERAL PUBLIC UTILITIES CORP. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| 5211-86-2177, NUDOCS 8610310255 | |
| Download: ML20211F764 (1) | |
Text
ENuclear
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Rcote 441 South Middletown, Pennsylvania 17057-0191 717 944 7621 TELEX 84 2386 Writer's Direct Dial Number:
5211-86-2fff "
Office of Nuclear Reactor Regulation Attn:
J. F. Stolz, Director PWR Projects Directorate No. 6 U.S. Nuclear Regulatory Commission Washington, DC 20555
Dear Mr. Stolz:
Three Mile Island Nuclear Station Unit 1 (TMI-1)
Operating License No. DPR-50 Docket No. 50-289 10 CFR 50 Appendix R Clarification of Compliance Multipie High Impedance Faults Pursuant to discussions between GPU Nuclear representatives and Mr. D. Kubicki, NRR PEISCB, regarding multiple high impedance faults events; GPU Nuclear will develop emergency fire procedures to respond to electrical bus trips resulting from multiple high impedance faults.
Upon trip of the electrical bus, procedures will instruct the operator to open the breakers for all circuits which are not protected in the affected fire zone and then re-energize the bus, thereby restoring power to the protected Appendix R loads.
The above actions, when incorporated into the operating procedures for post-fire shutdown, adequately address the multiple high impedance fault scenario. This commitment supersedes our previous position regarding multiple high impedance faults events (reference GPUN letter to NRC, 5211-86-2124, dated July 22, 1986, Item f).
8610310255 861022 DR ADOCK 0500 9
m H.
. Hukill Vice President & Director, TMI-1 HDH/DJD/spb:0694A cc:
J. Thoma, US NRC
/
R. Conte US NRC, TM7 Site
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Ob D. Kubicki, US NRC PEISCB j '0 A. Krasopoulos, US NRC, Region I l{U GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation