ML19294B702

Forwards Fire Protection Review of Items 3.2.2 & 3.2.3 Re Adequacy of Detector Installation & Fire Pump Flow Tests, Respectively

ML19294B702
Person / Time
Site:	Calvert Cliffs
Issue date:	02/26/1980
From:	Randy Hall BROOKHAVEN NATIONAL LABORATORY
To:	Ferguson R Office of Nuclear Reactor Regulation
References
NUDOCS 8003050363
Download: ML19294B702 (2)

Text

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i BROOKHAVEN NATIONAL LABORATORY ASSOCIATED UNIVERSITIES, INC.

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Upton. New York 11073 Department cf huc:ect Energy (516) 345- 2144 February 26, 1980 Mr. Robert L. Ferguson Plant Systems Branch U.S. Nuclear Regulatory Corrmission Washington, D.C. 20555 RE: Calvert Cliffs, Fire Protection Review, Items 3.2.2 and 3.2.3

Dear Bob:

Attached is Item 3.2.2, Adequacy of Detector Installation, and Item 3.2.3, Fire Pump Flow Tests, for the Calvert Cliffs Nuclear Power Plant.

Respet,. fully yours, -

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R6bert E. Hall,' Group Leader Reactor Engineering Analysis REH:EAM:sd attachment cc.: R. Cerbone wo/att.

W. Kato T. Lee E. Mac0cug111 V. Panciera wo/att.

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CALVERT CLIFFS Fire Protection Review Item 3.2.2 - Adequacy of Detector Installation SER Section 3.2.2 indicates that the licensee will provide the results of a study or tests to verify that proper consideration has been given to such factors as ceiling height and configuration, ventilation air flow rate and pattern, location and arrangement of plant equipment and combustibles, etc.,

in determining the type, number and location of the existing and proposed fire detector installations.

By letter dated December 21, 1979, the licensee indicated that the type, number and location of the existing fire detectors was determined prior to installation by representatives of Pyrotronics and reviewed and approved by the licensee, its architect / engineer and its insurance company. The licensee indicated also ; hat the fire detection system has been reevaluated and that actual area coverage is one-half to one-third manufacturer's recommended cov-erage.

In general, it appears that the reduction in detector spacing as a function of air-change rate and ceiling height is reasonable, except for cable chases 1A, 1C, 2A, and 2C, which have ceiling heights on the order of 50 to 60 feet. In rooms of this height, an array of detectors only at the ceiling will probably not detect a small fire. Therefore, there is no assurance that ceiling de-tectors alone can prevent fire damage of redundant divisions to cables in these spaces. The licensee has proposed to install automatic sprinklers in cable chases 1A and 2A automatic and total flooding Halon 1301 systems to protect cables in chases 1C and 2C. However, since the Halon system would be actuated by a smoke detection system, credit cannot be taken for a Halon sys-tem if the detectors are not effective.

Also, the licensee's response did not describe the details of the original de-sign method or the details of the subsequent review. Moreover, the licensee did not indicate that the spacing between detectors, and between detectors and walls, is within allcwable limits.

We recommend that the licensee install an automatic sprinkler system to pro-tect the cables in cable chases 1C and 2C, or to provide acceptable physical barriers for one of the redundant divisions there. We will also recommend that the licensee verify that the spacing between detectors, and between de-tectors and walls, is within allowable limits.

3.2.3 - Fire Pump Flow Tests SER Section 3.2.3 indicates that the licensee will perform full scale pump tests and furnish the results of such tests.

By letter dated November 13, 1979, the licensee confirmed that full scale fire pump tests were performed August 29, 1979 and witnessed by representatives of American Nuclear Insurers. The test results were also submitted.

Based on the submitted test results (corrected to constant pump speed) the fire pump performance is within 10 percent of rated output and therefore satisfactory. We recommend that the staff accept this item.

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