ML19331E285

Forwards Input on Fire Protection Review,Items 3.1.15/3.2.4, 3.1.16,3.1.28 & 3.2.2 Re Cable Separation,Fire Water Supply, Protection for Stairways & Open Hatch & Testing Fire Detectors

ML19331E285
Person / Time
Site:	Fort Calhoun
Issue date:	08/25/1980
From:	Randy Hall BROOKHAVEN NATIONAL LABORATORY
To:	Ferguson R Office of Nuclear Reactor Regulation
References
NUDOCS 8009090564
Download: ML19331E285 (3)

Text

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.u) , , ' 1 J BROOKHAVEN NATIONAL LABORATORY  ; '

i 'l.t~ :' ASSOCIATED UNIVERSITIES, INC.

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Upton. New Yo& 11973 ,

Departmentof Nuc!ectEnergy (516) 345- 2144

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August 25, 1980 Mr. Robert L. Ferguson Chemical Engineering U.S. klear Regulatory Commission '

Washi ; con, D.C. 20555 RE: Fort Calhoun, Fire Protection Review

Dear Bob:

f Attached is Brockhaven flational Laboratory's input on Items 3.1.15/

3.2.4, Cable Separation, Item 3.1.16, Fire Water Supply, Item 3.1.28, Pro-tection for Stairways and Open Hatch, and Item 3.2.2, Testing Fire Detect-

, ors, for the Fort Calhoun nuclear power plant. .

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Respectfully yours, /

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/obertE. Hall,N Group Leader

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Reactor Engineering Analysis REH:EN4:sd '

attacirent cc.: V. Benaroya ,

G. . Harrison .

W. Kato wo/att.

M. Levine "

E. MacDougall P. Sears -

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//f j IHIS DOCUMENT CONTAINS .

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FORTLCALHOUM 1

Fire Protection Review

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' Items 3.1 15 and 3.2.4 Cable Separation

, 3 SER Sections 3.1.15 and _3.'2'.4 indicate that the licensee will apply flame re-tardant coating or install fire barriers in areas where cable separation is a. N+,

concern. The ~ SER also stated that the licensee would describe the minimum separation between redundant cables and propose' modifications:.to preserve safe shutdown.where necessary. ,

s By le-ter dated September 29, 1978, the licensee provided the results of a cable separation analysis and proposed various modifications for areas where the licensee judged cable separation to be inadequate. These fire areas are

'the . fallowing: 6, 31, 32, 34A, 34B, 36, 41, and 42. By various ' licensee let-ter fieds:.bmittals and or by enclosures phone calls, the separation-in all of the areas is justi-barriers. Areas 41 and 42 are being evaluated in the -

safe shutcown study; area 36 has been resolved and its srparation is accept-able.

However, the other fire areas 6, 31, 32, 34A and 34B are unacceptable as sub-mitted. For areas 32, 34A and 34B the barriers have been justified for IEEE 384 requirements, but not for an exposure fire. For area 6 and 31, the en-closures' are designed for UL X-719 which is a continuous enclosure while the submitted enclosures-for trays have joints.

It is cur opinion that the cables in all fire area's have one of the redundant sets of cables rerouted out of the 5 areas. For area 6 and 31, the enclosures would be acceptable if~the submitted designs were changed to be continuous as in UL X-719.

Item 3.1.16 - Fire Water Supply SER Section 3.1.16 in' d icates that the motor-driven fire water pump recircula-tion line will be increased from 3 inches to 10 inches in diameter, and the pump intakelline will be relocated so that previously experienced failure of ,

.the pump due to sand ~and silt clogging the pump intake will not occur. The e licensee will also perform a special operational test of the fire water system h

on a sprinkler system mock-up.

By letter dated May 20,1980,-the licensee provided a descriptior, of the cur- -

. rent pump suction line design, the results of normal surveillance testing since modifications were completed, and the results of testing a mock-up of a

- sprinkler system.1 1

The test results -indicate that the. quantity of aand which flowed through the piping is unlikely-to impair the performance of fire pumps or sprinklers. In "

1 addition, by letter dated July 13,1978, the licensee indicated that the fire pump .dischargeistrainer had a 250 micron screen and that all orifices in the

= sprinkler system are 1/4 inch or' larger. Therefore,- sand-clogging of 'sprink- '

. ler system pipes' or' orifices through which water 'is flowing is unlikely. -:

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.We recommend that this item be accepted pro'vided that the licensee is requested to establish procedures to examine, test or flush sprinkler system }L portions have in which no flow occurred if one or more s,prinklers in that system operated.

The procedures-should follow the recommendations of HFPA i 13A-1978, Systems. " " Recommended Practice for the Care and Maintenance of Sprinkler ,

T Item 3.1.28 - protection for Stairways and Open Hatch SER Section 3.1.28 indicates that the stairday in the electrical penetration area (Fire Area 34) will be enclosed by fire barriers to provide 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> rated separation between basement and ground levels. A water curtain actuated by smoe detectors will be provided at the open stairway and open hatch which join personnel corridors in the basement level (Fire Area 6 1 and the ground level (Fire Area 20).

By letter dated Dececber 12, 1979, the licensee provided drawings and a de-scripticn of the prepcsed water curtains. By letter dated January 18, 1980,

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the licensee indicated that the water curtains became operational on January 11, 1930.

By letter dated March 14, 1980, BNL recommended that the NRC staff request the licensee to explain certain engineering features of the water cur--

tain. In a telephone explanation conference of April 18, 1980, the licensee gave further of the system. -

He recc:rsend that this system be accepted provided the licensee is requested x to verify that the Icss of off-site power will 'not result in the nonavail-ability of water curtain protection for the stairway and open hatch, to pro-vide '18_ inch deep noncombustible draft stops immediately adjacent to the stairway and hatch ' openings, and to verify that water curtains have been hydraulically designed to discharge at least 3 gallons per minute per lineal foot of water curtain, measured horizontally around the opening with no ~

sprinkler discharging.less that 15 gallons per minute. The licensee should further verify that the demand for either water curtain, plus 1000 gpa for interior hose streams, can be met by existing fire water supply system.

Item 3.2.2 - Testing Fire Detectors SER Section 3.2.2 indicates that the licensee will provide the basis and criteria for the installation and testing of fire detectors in the plant.

By letter ' dated January 8,1979, the licensee submitted a Fire Detector An-alysis which outlined the basis for location, spacing, and number of fire de- ,

tectors in Plant Fire Areas 1 through 43. By letter dated July 9,1979, the licensee responded to staff questions and concerns raised during a May 23, 1979 conference call.

BHL evaluation dated March 14, 1980 made further recommendations to the NRC.

By'a telephone' conversation of April 18, 1980 and a letter dated May 20, 1980, these recommendations were resolved.

We recommend that you accept this item.

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