ML20096H026

Special Rept:On 911206,twelve Smoke Detectors in Fire Detection Zone Were Inoperable.Cause Unknown.Detectors Replaced W/Pyrotronics Model DI-6

ML20096H026
Person / Time
Site:	Davis Besse
Issue date:	05/19/1992
From:	Storz L TOLEDO EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
AB-92-028, AB-92-28, NUDOCS 9205270073
Download: ML20096H026 (2)

Text

. . ,

y '. -

R. 1<. TtXEDO

%s EDISON A Cememt Ere w compe, EDISON PLAIA 300 MAD > SON AVENUE TOLEDO Ohio 43652 0001 NP 40-91-03 Rev. 1 AB-92-028 Docket Number 50-346 License Number NPP-3 May 19, 1992 United States Nuclear Regulatory Commission Document Control Desk Vashington, D.C. 20555

Subject:

Fire Protection - Fevised Special Report Pursuant to Technical Specification 3.3.3.8, Fire Detection Instrumentation Gentlement By letter dated December 6, 1991, Toledo Edison (TE) submitted a Special Report (Number NP-40-91-03) to the Nuclear Regulatory Commission (NRC) pursuant to Pavis-Besse Nuclear Power Station (DBNPS) Operating License NPF-3, Appendix A, Technical Specification (TS) 3.3.3.8, Fire Detection Instrumentation. In that Special Report, TE informed the NRC that the twelve smoke detectors in Fire Detection Zone (FDZ) si0 (containment building east passage) were inoperable. Based on the age and obsolascence of these detectors, TE stated its plans to replace them with a never detector (Py otronics Model DI-6) before restart from the eighth refu ling outage '

(currently scheduled to commence March 1, 1993) or during an outage of sufficient deratica.

Toledo Edison management has recently approved a planned modification that vill replace a 71gnificant portion of tha existing DBNPS fire detcetic system with a state-of-the-art detection system. Specific details on this ne ystem were provided at tha May 14, 1992 meeting between TE and the imC at ths RC's offices in Rockville, Maryland. The m.dification in scheduled for implementation during the current cycle (Cycle 8), during the eightn tefueling outage (8RFO), and ir.to the next operating cycle (Cycle 9). FDZ 410 is one of the zones included in the modificat:".. In the December 6, 1991 letter, TE had indicated replacement of the detectors in FD's 410 could occur during an outage of sufficient duration prior to 8RFn. Fuch a replacement would have been with the Pyrotronics Model DI-6 detectors, not t.he new state-of-the-art detectors.

9205270073 920519 PDR ADOCK 05000346 S PDR fh 2 2--

//9

. .- .-. . , . - . . - . . . . - . - . . - - - . . - - . . . - ~ . - - . . - . . . . . . . ~ . . - . . . .

~+

,g

-o,.

'DocketiNumber_50-346--

License Number NPF-3 Page 2 The Pyrotronics Model DI-6 detectors vould then need to.be replaced with the

. state-of-the-art detectors as a part of the modification. Due to the recent sanagement approval:of the planned modification and in order to keep worker radiation _ doses As Lov As Reasonably Achievable (ALARA), TE plans to replace the detectors in PDZ 410 only as a part of the upgrade modification. In that FDZ 410 is instJe-containment, it vill be upgraded during 8RF0.

If you have any questions, please contact Mr. R. V. Schrauder, Manager -

Nuclear Licensing, at (419) 249-2366.

Very truly-yours,

, .:) Y' &)

L. F. Stora Plant Manager KBR/ed cc: _A. B. Davis, Regional Administrator, FRC Region III J. B. Hopkins, NRC/NRR DB-1 Senior Project' Manager V. Levis, NRC Region III, DB-1 Senior Resident Inspector Utility Radiological Safety Board l

l l-l-

t

. ._..__._ _..___ _ _ _______ _ _ _ _. ___ . - _ _ _ _ _ _ - . . . _ - , , - .