ML19319A654

Forwards Request for Addl Info Re 770421 Submittal on Turbine Bldg Flooding Problem.Requests Response within 60 Days

ML19319A654
Person / Time
Site:	Oconee
Issue date:	11/10/1977
From:	Schwencer A Office of Nuclear Reactor Regulation
To:	Parker W DUKE POWER CO.
References
7711110, NUDOCS 7911190630
Download: ML19319A654 (4)

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%%gg cc: Mr. William L. Porter Duke Power Co@any P. O. Box 2178 422 South Church Street Charlotte, North Carolina 28242 J. Michael McGarry, III, Esquire DeBevoise & Liberman 700 Shoreham Building 806-15th Street, NW.,

Washington, D.C.

20005 Oconee Public Library 201 South Spring Strset Walhalla, South Carolina 29691

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RE0 VEST FOR ADDITIONAL INFORMATION 1.

Considering the essential equipment in the turbine building, and the adjacent Auxiliary Building, describe, discuss and demonstrate that the assumed design basis flooding rate of 1000 cfs is a conservative assumption with respect to the potential flooding rate following a design basis earthquake or turbine missiles, and that any proeosed modifications also take the same incidents into consideration, including but not limited to the following:

(a) the six personnel passageways located in the basement of the turbine building.

Demonstrate that all six doors are water-proofed and of strength equivalent to the common turbine-auxiliarv building wall.

(b) the emergency feeewater system (including all associated essential control power and piping).

Demonstrate that this system will remain functional following the above oostulated initiating events.

2.

In you-Acril 21, 1977 resconse, you indicated that you procese in the conceptual design to install nteroroof walls around three of the five low pressure service water pumos.

Further, you state that only two cumos are reouired to supply low pressure service water to Units 1, 2 and 3.

In regard to the above responses, provide the fe' 'owing infont.ation:

(a) a clear indication on a plan view of the turbine building base-ment, as to which of the five pumps will be orotected and the boundary of these waterproof barriers; (b) construction details fer these wateroroof barriers; (c) a line diagram, or a reference to the accropriate section in the FSAR, which shows all essential lines to and from all five LPSW oumes.

Describe the waterproof barriers surrounding the three LP5W pumos in the turbine building and how the inter-connections between the five systems will oermit any two of the three protteted pumps to supply low cressure service water to the essential heat loads in Units 1, 2 and 3.

3.

-In reference to your June 27, 1977 submittal, indicate when you intend to subrit the response to Iten nunber 5, regarding the ceak pressures that would La exoerienced in the CCW system by the sudden closure of one of the CCW valves..By discussion, relate these calculated peak pressures to the mcximum working pressures of.45 and 50 psig of the rubber expansion joints and to the resulting total area of the breach should the rubber expansion joints. fail.

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4 Figure 9-8 of the FSAR, HP and LP Service Water Systems, shows that the water discharged from the three LPSW pumps, for Units 1 and 2 passes through a single 42-inch line before it branches into the two suo:ly headers for Units 1 and 2.

Provide a description and discussion of the location, length and design features of this 42-inch line which demonstrates it is not appropriate to assune the failure of this line and the resulting subsequent less of all three LPSW pumps for Units 1 and 2.

5.

Ir. your A:ril 21, 1977 submittal, you indicate that Lake Keowee would be icwered, following a turbine building flooding event, to an elevation of 791 within about 15.3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> by utilizine the scillway and hydro units and by discharginc through the Turbine Building.

In regard to the above, orovide the following:

(a) the initial assu ed lake level and its relation to the maximum allowed level; (b) the relative amounts of water handled by the scillway, the hydro units and flow through the turbine building; and (c) explain why it is not possible for water to enter the turbine building when the lake level is 791 or less considering that the turbins building basement is at elevation 775 and the CCW system is designed to take advantage of the siohon effect.

6.

In your June 27, 1977 response you indicate that the essential Emergency Feedwater Pumo Turbine Oil Cooler Pur;s will not be protected fror. a turbine building floodinc event but rather a line will be added fror '.he LPSW pumo to the turbine oil coolers.

In regard to the above provide the following:

(a) a P&I diagram of the revised system; (b) a descr4:t'on and discussion of the NPSH requirements of the Emer;ency Peedwater Pump and Turbine Oil Cooling Syster, with

" esse:t to the most adverse available NPSH 7.

In your Ju e 27, 1977 response to the concern excressec Over the adecuacy of the water source for the five LPSW purcs, you indicate that your calculations show there was no deficiency in available NPSH with resoect to the ourps recuired NPSH, censidering any single failure.

Assuming the rest adverse octential daeaging sequence of events to the CCW syster calculate and orovide the minimum available NPSH to the LPSW.

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