ML20128A124

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Forwards Response to NRC 850307 Request for Addl Info Re Pmp.Info Discussed W/Nrc in 850328 & 0409 Meetings & Found Acceptable.Submittal Closes Open Item 1 & Related Backfit
ML20128A124
Person / Time
Site: Beaver Valley
Issue date: 05/17/1985
From: Carey J
DUQUESNE LIGHT CO.
To: Knighton G
Office of Nuclear Reactor Regulation
References
2NRC-5-071, 2NRC-5-71, NUDOCS 8505240129
Download: ML20128A124 (34)
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Text

{{#Wiki_filter:- -. l .y 'Af Duquesne @t =n (412)923-1960 Nuclear Construction Division Telecopy (412) 787-2629 Robinson Plaza. Building 2. Suite 210 Pittsburgh, PA 15205 May 17, 1985 United States Nuclear Regulatory Commission Washington, DC 20555 ATTENTION: Mr. George W. Knighton, Chief Licensing Branch 3 Of fice of Nuclear Reactor Regulation

SUBJECT:

Beaver Valley Power Station - Unit No. 2 Docket No. 50-412 BVPS-2 Response to Request for Additional Information on Probable Maximum Precipition

  1. ' Gentlemen:

Please find enclosed the DLC response to your Request for Additional Information letter on local flooding dated March 7, 1985. This information has been discussed with the staf f in meetings on March 28 and April 9,1985, and was found to be acceptable. The attachments to this letter contain the following information: : Methodology used to determine the volume of water that would enter safety related buildings using the staf f's HMR 51 and 52 analyses : Effects of the above water volume on safety related equipment : Parapet heights of safety related buildings Based on DLC's understanding of the PMP issue as discussed in Hugh L. Thompson, Jr. 's, letter to J. ~ J. Carey dated April 5,1985, the submittal of the attached information should satisfactorily close Open Item 1 and the related backfit. i DUQUESNE LIGHT COMPANY 'i SUJ} SCRIBED AND S RN TO BEFORE ME THIS /'/ DAY OF W , 1985. I I /Mg4/ M, By ' Notary Public J. y Carey ' / tce President $MilLA u. FATT041.R0tARY PUNIC l SHIPfinGPeti 8000.MAVER C00llTY I TJZ/wjs NY C051865$4018 EIP18tl SEPT.16.1995 AttachmentW. W % A'

  • M Mr. B. K. Singh, Project Manager (w/a)

} cc: Mr. G. Walton, NRC Resident Inspector (w/a) f (3c l .!l o AM 8505240129 850517 8 i

  1. T *,p3 r

PDR ADOCK 05000412 A PDR k .h

j. . Unitdd Stcteo Nuciscr Rigulctory Commission

  • Mr. G5crga W. Knighton, Chicf BVPS-2 Response... Probable Maximum Precipitation Page 2 COMMONWEALTH OF PENNSYLVANIA )

)' SS: . COUNTY OF BEAVER ) ,/ N day of , /k[6, before me, a I Ori this Q Notary Public in and for said Commonwealth and County, personally appeared J. J. Carey, who being duly sworn, deposed and said that (1) he is Vice . Pres ident of Duquesne Light, (2) he is duly authorized to execute and file the foregoing Submittal on behalf of said Company, and (3) the statements set forth in the Submittal are true and correct to the best of his knowledge. Notary Public 54tE6LA 5. FATTORE, NOTARY MitLIC SNIPMeWeti B000.SEAWER COUETY WY C0gstsS40N EWitES SEPT.16,1985 Member, Pennepivente Assessehes W M i

ATTACHMENT 1 Based on the information provided by the NRC question. and the communicatio2s between.the NRC and DLC ' during -- the week of March 31, 1985, _ the Probab.'e

Maximum Flood -~ flows in the plant areas and the corresponding water elevations

' above the Cat. ' 1. building door silis are shown in Table 1. The exterior door charact erist ics, including door width, potential wear gap, and threshold height of the doors af fected,- are shown in Table 2. The characteristics are according to door - design. Door wear gaps of 1/8, 1/16, and 1/32 in. are . assigned to ' normal doors, _ doors with vinyl weatherstripping, and gasketed doors,. - respect ively. A 1.5' in. thickness is used for all doors. - For calculating the flow through doors, an equation assuming - laminar flow between two parallel plates was derived. The sketch and derivation ~ are shown in Figure 1.- The water depths above the threshold are calculated from the NRC. water-elevations and the threshold heights. The velocity and flow were ~ ~ then calculated by equations 4 and 5, respectively. Volume - of water was - calculated for each door for the duration - that the water elevation exceeds the door threshold. The results show that the duration for potential flow through the door wear gap is only 5 or 10 minutes for all doors except door SB30-8, which is at the grade level of the service building. The flow through ~ door SB30-8 was calculated for a duration of 80 minutes. The results are listed in Table 2. ~ t

r-- - 1.- 4 LTABLE 1 1 NRC PMF (HMR 51 6 52) AND WATER ELEVATIONS _. Area 1 Area 2 - Area 3 T(Control Rm & Aux Bldg.) ~(Serv & Diesel Gen Bldg.) (Decontam Bldg.) Time -Flow Water Elev. . Flow-Water Elev. Flow Water Elev. (Qin) (cfs)- (ft mal) (cfs) (ft mal) (cfs) -(ft mal) ,5~ 13.4-0.6 -732.02 9.3 10 16.7 1.5 732.06 .11.6 -15 16.7

2.7 732.11 11.6 20.

20.1 ~4.2 732.16 13.9 25 23.4 6.2 732.22 16.2 30 -26.7 -9.1 732.29' 18.6 35 - 40.1 15.0 732.40 27.8 40 50.1 34.2 732.80 34.8 <45 60.1 735.58 9.5 732.40 41.8 50-19 9.1 735.80 7.2 732.20 136.9 735.80 55-53.4 5.6 732.20 37.1 60 46.8 4.5 732.20 32.5 65 26.7 3.4 732.20 18.6 -70' 26.7 2.4 732.10 18.6 75 20.0 1.5 732.10 13.9 80 16.7 0.8 732.06 11.6

85 16.7 11.6 90-13.4 9.3 95-13.4 "9. 3

'100 13.4 9.3 Note:

1..The NRC provided flows for all three areas, water-elevations for Areas 1 and ~

2, and peak water elevation for Area 3. For Area 3, the second largest flow is 41.8 cfs which is smaller than peak flow of 45.3 cfs using HMR 33. Since water elevation for 45.3 cfs is below the exterior door sills in the area, only the peak elevation needs to be considered for flows through exterior - doors.in Area 3. 2. In area 3, the 735.8 ft. water elevation is for door F35-1 only; the NRC -showed that the water elevations at other doors are 0.1 ft. Iower. 3. Water. elevations include only those exceeding the door sill. t

TABLE 2 CHARACTERISTICS OF EXTERIOR DOORS AND VOLUME OF FLOWS THROUGH THE DOORS USING NRC PMF VALUES DEPTH OF DOOR WATER OVER VOLUME 3 CAT. 1: DOOR' WIDTH MAX WEAR THRESHOLD-THRESHOLD DURATION (FT ) STRUCTURES 1.D. -(FT) GAP (IN) HEIGHT (IN) (FT) (MIN) INTERVAL SUM Aux.' Bldg. A35-5 8 1/16 5/8 0.248 5 36 0.028 5 9 45 A35-1 3 1/8 5/8 0.248 5 30 0.028 5 8 38 A35-3 3 1/8 -5/8 0.248 5 30 0.028 5 8 38 C= trol S35-71 7 1/32. 5/8 0.248 5 11 Bldg. 0.028 5 2 13 S35-74 6 1/32 5/8 0.248 5 10 0.028 5 2 12 ,S35-72 3 1/8 5/8 0.248 5 30 0.028 5 8 38 035-1 3.5 1/16 1/2 0.258 5 16 0.038 5 5 21 035-2 3 1/32 1/2 0.258 5 5 0.038 5 1 6 5 6 S35-1 3 1/32 0 0.30 / 0.08 5 2 S:rvice SB30-8 8 1/16 0 0.02 5 7 Bldg. 0.06 5 15 0.11 5 22 0.16 5 28 0.22 5 34 0.29 5 39 0.40 5 50 0.80 5 68 0.40 5 50 0.20 5' 31 0.20 5 31 0.20 5~ 31 0.20 5 31 0.10 5 21 0.10 5 21 0.06 5 15 494 SB30-7 3 1/8 5/8 0.248 5 30 30

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TE .e ATTACHMENT 2-EFFECTS.0F WATER VOLUME ON SAFETY-REI.ATED EQUIPMENT To determine. potential ef fect s of a Probable Maximum Precipitation (PMP) event on safety-related equipment, water depths were calculated using water leaking into the buildings through exterior doors (Attachment 1) based on the .PMP event developed by the NRC. The structures are the Auxiliary, Control, Service, Diesel Generator, and Fuel Buildings. The internal flood heights (were obtained based on' spreading the water over available floor space in the af fected areas. In calculating flood heights, no credit was taken for floor Ldrainisystems; however, the water was assumed to flow under interior doors, down stairs or through floor gratings to other areas containing safety- -related equipment. The results of these calculations are shown on Table 3. - Several' areas in the Auxiliary Building were analyzed for water leaking under doors A35-3 and A35-5 (Fig. 2). - Because of floor gratings, the water will eventually drain to the north and south sider of the Auxiliary Building at elevation 710 ft. 6 in. (Fig 3). The flood elevation at the north end is less than 1/2 in based on an effective floor area of 2,485 sq. ft. and that all, water entering from doors A35-3 and A35-5 (Figs. 2 and 3) flows there. If all water entering from door A35-3 flows to the south end, the water level ,is less than 1/8 in based on an ef fective floor area of 4,800 sq. ft. (Fig. 4)., Water leaking under door A35-1 (Fig. 2) can also flow to several r.reas: the walkway and cable area on elevation 735 f t. 6 in. - (Fig. 2) and/or down 'the stairs to the personnel access tunnel at elevation 722 f t. 6 in. (Fig.

3) and/or the electrical area elevation at 712 ft. 6 in. (Fig.

3). The resulting flood level. in the walkway and cable area is 1/8 in, based on 3,567 sq. ft, of ef fective ' floor area. There is no safety related equipment at elevation 722 f t. 6 in.; therefore, no water level was calculated. No water level was calculated for elevation 712 f t. 6 in. (cable spreading room) since the' ' cable in this area is capable of withstanding submersion. Water depths were calculated for the Control Room, Computer, Room, Equipment (fan) Room and elevation 707 f t. 6 in. In the Control Building (Figs. 5 and 6). Unit I and Unit 2 Control Rooms and their associated computer rooms were treated as one area. The water depth is less than 1/16 inch based on a combined ef fective floor area of 6,070 sq. ft. The sources of water are from doors 835-71 on the south side of Unit 2 Control Room and S35-1 which opens from. the main entrance passageway to Unit 1 Control Room. No water was assumed to drain to other areas. The equipment room (Figs. 5 and 6) is subject to flooding from two sources: doors S35-72 and S35-74. Most of the water leaking.under door 835-74 will flow down the stairs to elevation 707. f t. 6 in..but some may flow under door S35-73 and merge with water from door 835-72. The water flowing into the equipment room will flow unde r door 835-69 to the north stairwell. Because doors S35-69 and 835-73 are gasketed ' doors of the same width, the rate of water flowing into the equipment room from door S35-73 was assumed to equal the rate of water flowing out under door S35-69. Therefore, the equipment room is subject to a temporary water level of 1/2 inch based on a conservatively estimated floor area of 290 sq. room drains via the stairs to ft. Eventually the water in the equipment

F elevation '707 f t. 6 in, producing, with the contribution frois door S35-74, a -water depth of 1/8 in, based on an ef fective floor area of 3,620 sq. ft. -(Fig. 7). The emergency switchgear area in the Service Building (el. 730 f t. 6 in.) water level is 3/4 in. due to water leaking under doors SB30-7 and SB30-8. The available floor area is 8,500 sq. ft. (Fig. 8). The Diesel Generator Building is divided into two synusetrical halves each of which has 1,600 sq. f t. of ef fective floor area. In each side of the build-ing, water flows in from two exterior doors producing a water level of less than 1/4 in. (Fig. 9). Water flows into the Fuel Building froie under doors F35-1 and F35-2 and drains down a stairway - to elevation 729 f t. 6 in, causing a water depth of 1-5/8 in, based on 790 sq. ft. of ef fective floor area ( Figs. 10 and 11). Door F35-3 leads to the tell-tale drains area (Fig.10) and doors D35-1 and D35-2 lead to the Decontmaination Building. No safety-related equipment is located in these areas so no flood elevation was calculated. ~ In conclusion, since all safety-related equipment-is located above the afore-mentioned water levels, the PMP event has no adverse effect on equipment located in these buildings.

TABLE 3 WATER LEVELS'IN SAFETY-RELATED BUILDINGS DUE TO A PNP EVENT Effective Water Floor Area Level Building Elevation Location-Sq. Ft. Inches Auxiliary-710'6" -North 2,485 < 1/2 710'6" South 4,800 < 1/8 NA (A) '712'6" Electric Area 735'6" Cable Area 3,567 1/8 -. Control 735'6" Control Room 6,070 .< 1/16 735'6" Equipment Room 290 < 1/2 .707'6" Equipment Room 3,620 1/8 Service ~ 730'6" Emergency SWGR Area 8,500 3/4 Diesel Generator 732'6" North 1,600 < 1/4 732'6" South 1,600 < 1/4 (B) ' Fuel 735'6" Equipment Room 729'6" . Equipment Room -790 < 1-5/8 (C) 735'6" Tell Tale Drains (C) Decontamination 735'6" (A) Cable capable of being submerged (B) Temporary level before draining to lower elevation (C) No safety-related equipment e I 1 il

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f N. ATTACHMENT C BEAVER VALLEY POWER STATION - UNIT NO. 2 DUQUESNE LIGHT COMPANY ROOF AND PARAPET SYNOPSIS 1 The following - table. summarises. the roof-and parapet - information given on various. structural and architectural drawings. For each roof area,. the top - ofl roof (TOR) and top of parapet (TOP) elevations are for 'the respective low points. - The. thicknesses of insulation and ' huilt-up roofing and the depth of - the metal ' deck (where applicable) have been taken into account in determining Lthe TOR elevations. Parapets are level unless otherwise indicated. Each Seismic. Category I roof.is designed for whichever of the following has the most severe effect upon the design: - 30 pounds'per square. foot.(psf) as a' normal operating load - ~ 72 psf-as an extreme environmental load (snow) - all roofs ::are capable of withstanding the weight of water up to the elevation of the lowest. parapet (water-depth is given in the following ' table) as an extreme environmental load Roof-Elev. ~Elev. . TOP - TOR (see fig.) TOR TOP = (max. water HT) Overflows to a. '797'5" 797'11-1/2" 6-1/2" . Ground (N side) b. 812'1" 812 % 1/2" 6-1/2" Roof a. c. 797'3" 798'3" 12" Ground (N & W sides) F d. 807'4"- 808'6" 14" Roof c (3 sides); i Ground (W side) e. 798'11" 800'1" 14" Ground (N side); Roof f (E side) Roof g. f. No Parapet g. 774'4" 774'9-1/2" 5-1/2" Ground (N & S (sloping-sides) parapet) h. 797'4" 798'3" 11" Roof c. i. 808'10" 809'7-1/2" 9-1/2" Roofs h & 1 (E & W sides); Roof'e (S side) Roofs h & m (E & W j. No Parapet sides) s = r ,+y v m, 4 - -,, - -, - -..,, -,,,, - -, y,, y,--~~,,.w--,-- ,,w ,v,...r-..,-. ,.,w,.,--.,3-.,.. - - +,

Roof Elev. Elev. -TOP TOR (see fig.) TOR TOP (max. water HT) Overflows to -k. 808'10" 810'4-1/2" 18-1/2" Roofs h & m-(E & W sides through 4" shake space) 1. 808'7"- 809'6" 11" Ground (E side); Roof e (S side); Roof m (N side) m. 783'7" 784'6" 11" Ground (E side) Ground No Parapet n. Roof p No Parapet o. p. 769'1" 770'3" 14" Ground (N & S sides); Roof q (E side) q. 758'1" 759'7" 18" Ground r. 751'8" 752'11" 15" Ground (N, S, & E sides) .d n -e., s.- a ,n r - - -e-w w. s,---,, - - -

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