ML20023C360
| ML20023C360 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 02/24/1983 |
| From: | Fay C WISCONSIN ELECTRIC POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML20023C343 | List: |
| References | |
| NUDOCS 8305170263 | |
| Download: ML20023C360 (3) | |
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lHsconsin Elecinc eowra couesur 231 W. MICHIGAN, P.O. BOX 2046, MILWAUKEE, WI 53201 February 24, 1983 FRINCIPAL STAFF I RA ENF Mr. J. G. Keppler, Regional Administrator D/RA 3CS Office of Inspection and Enforcement, A/RA y
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f Region III U. S. NUCLEAR REGULATORY COMMISSION
' DPMA i.(; J fE{P-I 799 Roosevelt Road C N il V Glen Ellyn, Illinois 60137 i
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Dear Mr. Keppler:
DOCKET NOS. 50-266 AND 50-301 LARGEST FIRE SYSTEM FLOW RATE POINT BEACH NUCLEAR PLANT, UNITS 1 AND 2 This letter is in response to a question raised by Mr. Charles Ramsey of your Division of Engineering and Technical Programs staff regarding the largest single fire water flow requirement at Point Beach Nuclear Plant.
The Fire Protection Review performed at Point Beach by Bechtel Power Corporation, dated June 1977, discussed the fire water system capacity.
This Fire Protection Review was prepared using Standard Review Plan Section 9.5.1 and its Appendix "A"
as a guidance document.
A comparison of the installed fire protection system at Point Beach to the guidelines of 9.5.1, Appendix "A",
is made in Section 5.2.5 of the Fire Protection Review.
-It is stated that, in effect, the supply should be based on the largest sprinkler or deluge requirement but not less than 2500 gpm.
In response to the question, a further review of the flow requirements of water suppression systems at the Point Beach site has been made; the largest flow requirement found is that of a main power transformer water spray system on Unit 1 in conjunction with the water curtain wall exposure spray system adjacent to the transformers.
Upon operation of the adjacent transformer water spray system in the event of a fire, the wall water curtain spray system is assumed to operate as a result of the same fire.
Flow requirements for the transformer water spray and the wall water curtain spray systems are 831 gpm and 576 gpm, respectively, for a total flow requirement of 1407 gpm.
This is the largest flow requirement found for any 8305170263 830509 DRADOCK05000g
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Mr. J. G. Keppler February 24, 1983 water suppression system on site.- The Fire Protection Review did not specify a particular system flow requirement for a nonsafety-related fire case but makes reference to 2000 gpm.
It is believed the 2000 gpm is a generic statement of largest flow requirement based upon the rated fire pump capacity of 2000 gpm.
We agree that this is a somewhat confusing statement, but in any case does not concern safety-related fire areas.
It is important to note the statement in the Fire Protection Review that "the flow rate requirement for sprinkler or deluge systems is considered to apply to safety-related areas".
More specifically, the fire protection equipment and systems which provide primary fire protection for systems and equipment necessary for safe shutdown are to meet the previous referenced requirement of 1000 gpm plus the greater of 1) all sprinkler heads opened and flowing in the largest designed fire area or 2) the largest open head deluge system (s) operating.
The only water suppression systems which provide protection for safe shutdown areas are the wet pipe sprinkler systems for the service water pumps, the diesel generator rooms, the safety injection pumps, and the component cooling water pumps.
The sprinklers for the diesel generator rooms are supplied from the service water system capacity.
Flow demand requirements for the sprinklers protecting the service water pumps, safety injection pumps, and the component cooling water pumps are based on a pipe schedule sprinkler design for Ordinary Hazard - Group 3.
Since hydraulic calculations are not performed for pipe schedule systems as outlined in NFPA 13, the exact flow requirements of the systems are not available.
However, if compared to the criteria for hydraulically designed sprinkler systems (Table 2-2.1[B], NFPA 13), the largest density for Ordinary Hazard - Group 3 is 0.21 gpm per square foot.
As a conservative estimate of the system flow demand, it can be assumed that a density of 0.21 gpm per square foot over the entire protected area is required.
This results in flow demands of 213 gpm, 125 gpm, and 99 gpm for the service water pumps, the component cooling water pumps, and the safety injection pumps, respectively.
Thus, the largest fire flow demand for a safe shutdown area is 213 gpm plus 1000 gpm for hose streams or 1213 gpm total.
It should be noted that these sprinkler systems were not yet installed at the time of the 1977 Fire Protection Review.
Based on this evaluation, there should be no question that the system has adequate design capacity to meet the requirement for safety-related areas which are of concern to the NRC.
As you are aware, Point Beach Technical Specifications specify functional requirements related to fire protection system components which would be employed to mitigate the consequences of fire which could affect equipment required for safe plant shutdown.
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Mr.
J. G..Keppler February 24, 1983 We trust that the information in this letter will alleviate any concerns about the capability of the fire water suppression systems as related to protecting safety-related equipment at the Point Beach Nuclear Plant.
Very truly yours, Vice President Nuclear Power C. W. Fay Copy to NRC Resident Inspector
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