ML20091A264

Comments on Proposed Interim Tech Specs Re Fire Detection Operation & Sureveillance Requirements

ML20091A264
Person / Time
Site:	Monticello, Prairie Island
Issue date:	02/10/1977
From:	Gardebring S MINNESOTA, STATE OF
To:	Stello V Office of Nuclear Reactor Regulation
References
NUDOCS 9105140468
Download: ML20091A264 (2)

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p 50- u z./ so 4 /u s a Minnesota Pollution Controggg y ad ,uag .wy REA0:{f DOCKEiill.iC04 Mr. Victor Stello, Director W c Division of Operating U.S. Nuclear Regulatory Commissip TReactors..;i go gt 1.

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Dear Mr. Stello:

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On January 31, 1977 Northern States Powef filed requests to amend the Monticello and Prairie Island licenses to incorporate interim operational and surveillance requirements with respect to fire detection and protection systems. Because both submittals are so very similar, my comments will apply to each except where noted.

The Tech Spec requirement states that N-l out of N detectors .4n a zone must be at all times operable. However, many zones are

? guarded by only one detector. Now admittedly some zones are f lesser importance, but for those zones where f. ire could more seriously threaten safety systems more than one detector should be required. The Prairie Island cable spreading room falls in this latter category.

The Tech Spec functionability test schedule, every 36 months at Prairic Island and every 12 months at Monticello, appears to be too lenient in view of the few number of detectors in some zones.

We do not know what to suggest for more frequent testing, but we do note the Monticello plan to inspect and clean detectors every six months. If dirt and dust accumulation is apt to be a twice yearly problem to the point of requiring cleaning, then there appears to us a possibility for detector impairmont due to either the dirt or the cleaning. How dirty may a detector become before impairment is serious? In any event we would think function tests should occur more frequently, perhaps as often as the dirt inspection.

We note tnat for the most part ion detectors are relied upon to carry the burden of fire detection. We would suggest that in the critical plant zones that the photo-electric opacity detector type be also required.

Sincerely, M.

' Sandra S. trdebring Executive D Lrector 1935 West Counh Rood B2, Roseville. M'nnesofo 55113 Regional Cffice> Duluth / Brainer1/ Fergus Falls / Mon 1011/ Rochester / Roseville e.

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