ML17277A397

Forwards Addl Info Re Potential Effect of Severe Meteorological Events on Diesel Generator Intakes & Exhausts.Diesel Generator Design Insures That at Low Load or No Load Operation,Adequate Air Is Delivered to Engine

ML17277A397
Person / Time
Site:	Columbia
Issue date:	12/28/1982
From:	Bouchey G WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Schwencer A Office of Nuclear Reactor Regulation
References
GO2-82-1015, NUDOCS 8301040762
Download: ML17277A397 (8)

Text

REGULATORY It RMATION DISTRIBUTION SYST (RIDS)

ACCEISSION NBR:8301000762 DOC ~ DATE: 82/12/28 NOITARIZED:

NO DOCKET FACIL:50 397 WPPSS Nuclear Projects

-Uni t 2I Washington

-'Publ ic Powe 05000397 AUTH, NAtlE AUTHOR AFFILIATION BOUCHEY,G,D, Washington, Public Power Supply System RCCIP. NAME HEC IP IENT AFFIl.IATION SCHliENCER I ~ B Licensing Branch '2

SUBJECT:

Forwards addi info Ere potential effect of ~severe meteorological events on diesel generator intakes 8

.exhausts.Diesel "generator design insures '-that at low load or no load operation@adequate air is deliveled to engine.

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Washington Public Power Supply System P.O. Box 968 3000 George Washington Way Richiand, Washington 99352 (509) 372-5000 December 28, 1982 G02-82-1015 Docket No. 50-397 Mr. A. Schwencer, Chief Licensing Branch No.

2 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.

20555

Reference:

NUCLEAR 'PROJECT NO.

2 CLARIFICATION OF DIESEL GENERATOR CAPABILITY TO WITHSTAND SEVERE METEOROLOGICAL EVENTS Letter G02-82-641, G.D. Bouchey (SS) to

.A. Schwencer (NRC), "Design Basis Dust Storm Effect on Diesel Generator Building Air Intake", dated August 5, 1982 The Nuclear Regulatory Coriltission staff has requested additional infor-mation regarding the potential effect of severe meteorological events (dust storms, rain, freezing rain, and snow) on the WNP-2 Diesel Gener-ator intakes and exhausts (SER Section 9.5.8).

The staff has also requested information regarding cold weather diesel generator no load operation.

The potential effect of severe meteorological events on the diesel gen-erator intake is discussed in the referenced letter.

The potential effects on the diesel exhaust are discussed below:

"'Rain The diesel generator exhaust design includes a low point drain which was evaluated and shown adequate for draining heavy rainfall.

In the evaluation, a probable maximum precipitation of 5.2 inches per hour (worst hour of. design basis thunderstorm) was assumed to enter the exhaust pipe.

This precipitation is equivalent to 0.14 gpm down the exhaust pipe, which is easily removed by the one inch drain.

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Mr. A. Schwencer Page 2

December 28, 1982 G02-82-1015 Freezin Rain A review of historical freezing rain (ice storm) data indicates a worst case storm in southeast Washington depositing one-half inch of ice.

For conservatism, the effect of 1.5 inches of ice on the diesel exhaust open-ing was considered.

This amount of ice around the circumference of the exhaust opening would reduce the flow area by 25Ã for a short period of time until the ice is melted and blown off by the hot exhaust.

This reduction in area would not prevent starting and running of the diesels.

Dust The desig~ basis volcanic ashfall has an average dus$ concentration of 174 mgm/m while the severe dust storm had 8.9 mgm/m The volcanic ash-fall has a duration of 20 hours2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br /> and the dust storm 18 hours2.083333e-4 days <br />0.005 hours <br />2.97619e-5 weeks <br />6.849e-6 months <br />'; therefore, the ashfall is the worst case to consider for dust effects on the diesel exhaust.

The exhaust is a closed pipe except for a one-inch drain.

Air flow into the pipe would be small.

For dust accumulation evaluation

purposes, a

5 mph constant air flow was>assumed into the c)used exhaust pipe, resulting in deposition of 0.4 ft of ash (39 ibm/ft density un-compacted)..

This quantity of dust would not restrict the diesel exhaust enough to cause loss of capability to meet design requirements.

The ash is of very fine particle size (average,75pm) and would be blown out of the exhaust as the diesel accelerates to operating speed.

Snow The design basis snow fall for the WNP.-2 site is 3.2 feet.

Since the diesel exhaust opening is on a vertical plane and 6 feet above the roof where snow would accumulate, blockage by snow is not credible.

Any snow that might blow into the exhaust pipe would be blown out and/or melted on starting of the diesel.

The diesel can operate with up to.15 inches (H 0) of back pressure, but is designed for less than 5 inches (H~O) for long term operation.

Even if half the snow fall went into the exhaust pipe, the back pressure would only increase 3 inches (H~O) using a snow density of 7 ibm/ft.

Therefore, snow effects would no't prevent starting of the diesels.

Mr. A. Schwencer Page 3

December 28, 1982 G02 1015 Diesel Generator Cold Weather No Load 0 eration The WNP-2 diesel engines are manufactured by Bruce G.M.

A unique feature of their design is that they may operate for long periods of time at rated speed with no load and not impair their operation even in below zero degree

. weather

~

This capability is due to the engine's turbocharger being oper-ated by a direct gear drive design until the engine approaches rated, load, at which time the turbocharger drive operates by exhaust gases.

This design insures that at'ow load or no load operation adequate air is delivered to the engine to assure complete combustion of the fuel, thereby keeping injectors and other components clean.

Very truly yours, G.

D.

B uchey, Manager Nuclear Safety and Regulatory Programs DMM/vlc cc:

R. Auluck -

NRC W. S.

Chin -

BPA R. Feil -

NRC Site

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