ML20080H826
| ML20080H826 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 02/07/1984 |
| From: | Hukill H GENERAL PUBLIC UTILITIES CORP. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| 5211-84-2028, NUDOCS 8402140340 | |
| Download: ML20080H826 (2) | |
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i GPU Nuclear Corporation Nuclear
- , ors =8o Middletown, Pennsylvania 17057 0191 717 944-7621 TELEX 84 2386 Writer's Direct Dia Nurnber
February 7, 1984 5211-84-2028 Office of Nuclear Reactor Regulations Attn: John F. Stolz, Chief Operating Reactors Brench No. 4 U. S. Nuclear Regulatory Commission Washington, D.C.
20555
Dear Sir:
Three Mile Island Nuclear Station, Unit 1 (TMI-1)
Operating License No. DPR-50 Docket No. 50-289 Halon Explosion Suppression Systems -
Air Intake Tunnel
Reference:
TMI-l Tech. Spec. Change Request No. 97, Rev. 1 Section 3.18.5.2 The above referenced Tech. Spec. Change Request, which was submitted to the NRC, deletes the requirement of operability of Air Intake Tunnel Deluge System when the Halon Systems are inoperable.
On January 13, 1984, during a telephone conversation, the rationale for the change was explained to Mr. D. Kubicki of your staff as a response to his inquiry. The following is the summary of that telephone conversation:
The postulated hazard for the air intake tunnel is an explosion of jet fuel-air mix caused by a crash into the air intake tunnel. The Halon Systems used are for explosion suppression. These systems operate on the principle that there is a nhort but measurable time delay between the ignition of a flame front and the buildup of destructive pressure (shock wave). The Halon Systems are designed to react quickly enough to prevent such an explosion.
There are no fixed combustibles in the Air Intake Tunnel that require protection by these deluge systems. The deluge systems in the air intake tunnel serve to cool the tunnel, wash fuel contaminants from the air, and prevent reignition of jet fuel af ter the Halon Systems have suppressed the incipient explosion. With the Halon Systems inoperable, the deluge systems are not capable of reacting quickly enough to suppress an explosion, and alone serve no design basis function.
8402140340 840207 PDR ADOCR 05000289 p
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GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation
D:
4 Mr. John'F. Stolz 5211-84-2028
- Therefore, the requirement to keep the air intake tunnel deluge systems operable when Halon' Systems are inoperable has been deleted. Additional information suppoing_this change is contained in the FSAR Section 9.9.7,
" Fire Detection and Suppression Following a Hypothetical' Aircraft Incident".
S cerely, f
JD. Hukill Director, TMI-l HDH:MI:vj f cc:
J. Van Vliet R; Conte
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