ML19263E235

Forwards Revised Design Description for Mod Re Steel Frame Near Diesel Fire Pump Fuel Storage Tank

ML19263E235
Person / Time
Site:	Fort Calhoun
Issue date:	05/23/1979
From:	Short T OMAHA PUBLIC POWER DISTRICT
To:	Reid R Office of Nuclear Reactor Regulation
References
NUDOCS 7906050355
Download: ML19263E235 (10)

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r-MH Omaha Public Power District 1623 MARNEY OMAMA. NgeRAsMA 68102 TELEPHONE S36 4000 AREA CODE 402

'427 2;, 1979 Director of :Iuclear Reactcr ?.egulation Ar.I: .r. Ecbert '4. Reid, Chief Operating Peactors 3 ranch :Ic. -

U. 3. helear Regulatory Cctnissicn Washington, D. C. 20555

Reference:

Decket :Ic. 50-285

'3entleren -

3y letter dated Februar/- 23, 1979, the Craha Public Power District proposed a modification intended to prevent structural steel framing in the 'ticinity of the diesel fire pump fuel storage tank frcm being damaged by a fire at the tank. The modificaticn was proposed in acccrdance with the requirements of the Fort Calhoun Staticn Fire Frctection Safety E ralu-ation Eeport (SER), issued by the Con.ission on August 23, 1978. As a result of ecnversations held with members of the staff, the design des-cripticn for the modificaticn was revised in the form attached hereto.

The revisicns include proviciens fcr a concrete bern su rcunding the structure and wing valls which provide protection fcr the drain line and site glass.

Sincerely, e

T. E. Short Assistant General anager

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. s GSE-B-2 2 FO R t.t Fuel Tank for Diesel Driven PREPARED BY /f '.,"" N - ~ f Fire Pump Design Description REVISION 01 CHECKED BY ( E gg, 1 2 AUG 011975 approved c,' c, r_ CONT ON SH DATE REv

• DATE I /IC,/n OMAHA PUBLIC POWER DISTRICT MR NO FC 7%51 GENERATING STA ENG.

DESIGtt DESCRIPTIOl4 FUEL TAfiK FOR DIESEL DRIVE?l FIRE PUMP ft0DIFICATI0fl FORT CALH0uti STATI0fi MODIFICATI0ll REQUEST fl0. MR FC-78-51 A. DESCRIPTI0il B. JUSTIFICATIO1 C. SCOPE D. TASK ESTIMATE E. TASK SCHEDULE 2299 327

GSE 8 2 2 FORM - Fuel Tank for Diesel Driven PREPARED BY d'/!'~r W '*d Fire Pump Design Description REVISION 01 CHECKED BY / /- C 3 M 2 N ON %

DATE AUG 011975 appRovco / cn <

REV' O DATE , // -/,9 OMAHA PUBLIC POWER DISTRICT MR NO. FC 78-51 GENERATING STA ENG.

DESIGN BASIS In accordance with the Safety Evaluation Report by the Office of Nuclear Reactor Regulation, U.S. Nuclear Regulatory Commission, Docket No. 50-235, paragraph 3.1.4, page 3-1, a modification will be made to prevent structural steel framing in tne vicinity of the fuel storage tank, supplying the diesel engine-driven fire water pump, from being damaged by a fire at the tank. A

. postulated fire outside the Fort Calhoun Pcwer Station Intake Structure asso-ciated with the 550 gallon fuel oil supply tank could potentially damage tne structural frames of the Intake Structure and collapse the structure resulting in damage to the raw water pumps.

2299 328 e

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5822 TORM PREPARED BY/4 b' !", ss Fuel Tank for Diesel Driven REVISION O1 CHECKED BY I 'L L< . Fire Punn Desion Descrintion SA N * * "

DATE AUG 011975 appRovEo e e v.

REV' / DATE 8N' 4,' OMAHA PUBLIC POWER DISTRICT MR TASK NO. H -I6- GENERATING STA ENG.

DESIGt! PACKAGE A. DESCRIPTION:

In accordance with a recommendation by NUS Cornoration's R. A. Eman and Consultant W. H. Doyle, a solution to nratection of the structure from a fuel tank fire is to burv it above around. Their recommendation to accon-niish this would be to coat the tank with a corrosion resistant oaint, surround the tank with a reinforced steel tank and fill the tank with sand

. to provide a ninimun of one foot of sand cover connletely around the tank.

In order to correct the current entential hazard, the reconrendation to bury the tank above cro .1d annears to be the best approach. Any other nossible correction would require ounninn the fuel from the tank to the fire curn and the tank located at a much further distance. Rather than usinn a reinforced steel tank to surround the fuel tank, it is reconmended that a reinforced concrete block structure be built around the tank with a precast 8" concrete span deck roof.

B. ilHSTIFICATION:

The approach to bury the tank above cround allows the neronative of leavino the tank in its current vicinity. To nove the tank nhysically far enouch away from the buildinc so as to not cause structural danace to the buildino in the event of a fire or to bury the tank north of the Intake Structure would reauire the addition of fuel cumos to transfer the fuel from the tank to the fire punn. Such a move would jeonardize the cacability to nrovide fuel to the fire nunn by havina to rely on the onerability of a fuel ouro.

The installation of a reinforced concrete block structure around the 'uel tank is considered more advantaneous than a reinforced steel tank. The concrete block structure will blend in with the surroundinn buildinas better and will be easier to naintain. The tank would be easier to service.

An analysis was nerformed for the structural slab upon which the concrete block structure is to be built. Thi- indicated that both shear and moment capacities of the slab are adecuate when considerinn a AASHTO HO-20 ;neel loadino on the west side of the structure simultaneously with an earsn-quake load of an estinated 2/3 of .179 in the vertical direction.

2299 ;29

SDB22 TORM PREPARED BYM b 2 M e

• O1 REVISION DATE AUG 011975 CHECKED BY Approved

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REV / DATE S/4/7 9 OMAHA PUBLIC POWER DISTRICT TASK NO ttR-FC-78-51 GENERATING STA ENG.

C. SCOPE:

The existing fuel tank is located on a metal stand within a concrete basin on the west side of the Intake Structure. The fuel tank is currently sur-rounded by a concrete bern, which is 8 inches wide and 10 inches hiah along the north, south and west sides.

This nodification would recuire that the existino concrete berm be renoved

, and that the fuel tank and stand be noved 13 inches further away from the Intake Structure. A new concrete been 12 inches hiah by 14 inches wide (15 inches wide alonq the wall of the Intake Structure) would be constructed around the fuel tank and utilized as a base footino for the new concrete block wall. The floor of this new basin would be grouted with a 1:4 sloce to tre drain. A 1 inch drain line would be installed in the new bern with a sand screen fastened to the basin side and a lockinq valve with an attachnent for a hose on the exterior side. The existing fuel tank drain line, fill line, and vent line would be extended to reach beyond the bounds of the new structure both horizontally and verticallv. The tank with its associated piping and the netal stand would be coated with a corrosion resistant caint A concrete block wall, 11 coarses hiqh would be constructed on ton of tne concrete bern on all four sides and would oe rQinforced horizontally and vertically and grouted full. A sealer anolication would be made to tne interior and exterior side of the walls and to the floor to nrevent noisture fran penetratinq throunh the structure. The basin would be filled wi*.h a mixture of 1 1/2 inch crushed linestone and sand to a denth of 2 feet and with dry sand to the top. An 8 inch thick cre-cast concrete span deck wculd be installed for the roof deck. All ,ioints and penetrations would te caulked.

A steel ladder would be installed on the south exterior face to allow access to the roof. The exterior would then be painted in a color compatible to the Intake Structure. A new concrete berm 12 inches hich by 12 inches wice would be constructed 4 feet away from the new structure alo'ng the north, south and west sides. Two 1 inch diameter drain pices would be cast in place on the west side and they would be plugged for nornal operations.

2299 30

PREPARED BY A. Mr ca 'S<A CHECKED BY ?6A 0 SH.1 CONT. ON SH APPROVED 6MA R Ev. I DATE s/ry/ 79 OMAHA PUBLIC POWER DISTRICT I GENERATING STA ENG.

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