ML20091G134

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Forwards Response to Site Analysis Branch 840418 Questions 311.5 - 311.8 Re Topography & double-ended Rupture of Pipeline.W/One Oversize marked-up Topographical Map Encl. Aperture Card Is Available in PDR
ML20091G134
Person / Time
Site: Beaver Valley
Issue date: 05/30/1984
From: Woolever E
DUQUESNE LIGHT CO.
To: Knighton G
Office of Nuclear Reactor Regulation
References
2NRC-4-066, 2NRC-4-66, NUDOCS 8406040159
Download: ML20091G134 (8)
v • d • e


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}Vg 2NRC-4-066 (412) 787 - 5141 (412)923 - 1960 Telecopy (412) 787-2629 May 30, 1984 Nuclear Construction Division Robinson Plaza, Building 2, Suite 210 Pittsburgh, PA 15205 United States Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:

Mr. George W. Knighton, Chie f Licensing Branch 3 Of fice of Nuclear Reactor Regulation

SUBJECT:

Beaver Valley Power Station - Unit No. 2 Docket No. 50-412 FSAR Site Analysis Questions Gentlemen:

At tached to this le t ter are our res ponses to the Site Analys is Branch questions (311.5-311.8) forwarded to Duquesne Light Company in your letter dated April 18, 19 84.

Also attached is the scaled topographical map reque s ted in Que s t ion 311.5.

It is DLC 's int ent ion to include these res pons es in the next FSAR amendment.

DUQUESNE LIGHT COMPANY By E.VJ. "Woolever Vice President TJZ/wjs At t achment t

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Que s t ion 311'.5: '.See: ien 7 2 2) '

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Please provide 'a secled topographical map tiaich shows the exact reuting of n.i eline so u:he as t - of the Scaver Valley site.

an. w. ars the ' Mobil Oil P

.that.the pipeline, as. indicated on the U.S. C.S. tepcgraphical nnp "To oke-

town, PA,"

(publi.shed in 1954 and photo revised in 1979), could haJe a break releasin2 - Easoline.in:o the Peggs Run.

Peggs Run C ewr thr ough :he plan: exclusion area between the brid ge and the cooli g teue rc.

'igur e 2.2-3 ( Amendment No. 3) does not show the relatienchip be: ween Peggs P.un and the Mobil Oil Cc~.pany pipeline of fsite.

Res pons e :

.The scaled topographical map will be provided under separa:e ecver.

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e n1224106src7an 05/17/84 160 BVPS-2 FSAR NRC Letter: April 18, 1984 1.8 Question 311.6 (Section 2.2.3) 1.11 Provide an analysis of a postulated rupture of the relocated Mobil 011 1.12 pipeline involving a small leak (of the order of a few gallons per hour) 1.13 that goes undetected.

The break should address at least two break 1.14 locations.

First, assume a break at the closest location of the 1.15 pipeline to the Unit No. 2 diesel generator building.

Second, assume a 1.16 break at a point on the hillside above Peggs Run.

Calculate both the 1.17 thermal flux from burning gasoline and the peak reflected overpressure in the event of ignition of a gasoline vapor cloud for each of the above 1.18 postulated breaks.

Response

1.19 The Mobil 011 pipeline is buried approximately 8 feet below the grade 1.21 level.

In accordance with 49 CER, Section 195.412, the pipeline route 1.22 is patrolled at intervals of every 2 weeks by the pipeline 1.23 owner / operator. The mission of the patrol crew is to detect any visible 1.24 damage or leaks in the pipeline. The patrol crew is not equipped to 1.25 detect subsurface leaks in the pipeline that are not visible at the grade level. A small subsurface leak of a few gallons per hour does not 1.26 possess sufficient driving force associated with it to cause well-up of 1.27 gasoline to the surface.

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The slow leak also implies that a significant portion)islostby I

1.28 subsurfacediffusionandevaporationandbit cannot collect 4 Since a 1.30.

small leak cannot flow as a liquid stream, the gasoline cannot enter Pegg's Run. A small leak, at all locations in the vicinity of BVPS-2 1.31 is, therefore, incapable of causing the formation of a gasoline vapor 1.32 cloud.

A discharge of few gallons (assume 2 gallons per hour) of gasoline is 1.33 not even required to be reported to the U.S.

Department of 1.34 Transportation (DOT) since it is not a safety hazard.

A 2. gallon per 1.35 hour4.050926e-4 days <br />0.00972 hours <br />5.787037e-5 weeks <br />1.33175e-5 months <br /> leak is equivalent to approximately 1 barrel per day.

The DOT 1.36 requires that leaks over 50 barrels per day or more be reported.

Even if small leaks were considered a safety hazard to BVPS-2,~their 1.37 consequences are far less in magnitude than discussed in the response to 1.38 Question 311.7.

Therefore, a small leak with undetected discharge of a 1.39 few gallons per hour of _ gasoline from the pipeline does not constitute a 1.40 safety hazard to the BVPS-2 structures.

311.6-1

n1224106sra7ao*

05/17/84 163 BVPS-2 FSAR NRC Letter April 18, 1984 1.8 Question 311.7 (Section 2.2.3) 1.11 Provide an similar analysis of a complete double-ended rupture at the 1.12 locations listed in Question 311.6.

Indicate the. quantity of gasoline 1.13 released prior to isolation valve closures.

Response

1.14 A complete double-ended rupture of the pipeline is postulated to occur 1.15 at (1) the closest location of the pipeline to a BVPS-2 safety-related 1.16 structure (diesel generator building),

and (2) a location on the hillside above Peggs Run. A double-ended rupture in the vicinity of 1.17 l

BVPS-2 will release a maximum of 23,380 gallons of gasoline prior to and after the pumping is stopped. This quantity of gasoline forms the basis 1.19 of the rupture analysis for both locations.

1.

Double-ended rupture at closest location of the pipeline to the 1.21 BVPS-2 diesel generator building:

The closest distance of the pipeline to the BVPS-2 diesel generator 1.23 building is approximately 950 feet. The maximum 23,380 gallons of 1.24 i

gasoline spilled will be spread over an area of 31,741 sq. ft.

Approximately 1,562 lbs of-gasoline will vaporize to form a 1.25 combustible vaport cloud. Since the gasoline vapor-air mixture is 1.26 unconfined, the combustion of the vapar cloud will be characterized by a subsonic flame front propagation and small pressure changes. 1.27 The combustion of this gasoline vapor cloud has two effects on the 1.28 dieselgeneratog an incident pressure and a thermal flux.

1.29 The incident pressure imposed on the diesel generator building is 1.30 0.6 psi, which is equivalent to 2.4 psi reflected pressure.

The 1.32 thermal flux "seen" by the diesel. generator building is 2,950 a

watts /m. The calculated value of thermal flux can be compared with 1.33 the 1,000-1,250 watts /ma peak solar flux measured for Albuquerque, 1.34 New Mexico.

The thermal flux generated by gasoline-vapor 1.35 fire / explosion will be short in duration. Therefore, the calculated 1.36 thermal flux is not a safety hazard to the-diesel generator building.

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2.

Double-ended rupture on the hillside above Peggs Run 1.38 A double-ended rupture of the pipeline on the hillside above Peggs 1.40 Run will release a maximum of 23,380 gallons of gasoline.

The 1.42 terrain topography relative to the location of the pipeline favors j.

the drainage of gasoline directly into Peggs Run.

The nearest 1.44 safety-related structure is the BVPS-2 diesel generator building, located approximately 1,600 feet away from the location.

If a 1.46 gasoline -vapor cloud combustion is postulated'in,this area, the severity of effects (incident pressure and thermal flux) on the 1.47 BVPS-2 diesel generator building will be far less than that discussed in Question 311.7.1.

The run-off of gasoline into the 1.48 l

311.7-l'

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s n1224106sra7ao' 05/17/84 163 BVPS-2 FSAR Peggs Run culvert and accumulation of vapor at the exit end of Peggs Run also present a potential explosion hazard. Therefore, two other 1.50 resulting from this pipeline rupture scenario were considered cases in the analysis (1) explosion of gasoline vapor inside the 1,800 1.51 feet long section of the Peggs Run culvert and, (2) a vapor cloud explosion at the exit end of the Peggs Run culvert.

1.52 Approximately 1,800 feet of Peggs Run flow is through a 15-feet 1.53 diameter culvert. The culvert is equipped with manhole covers for 1.54 servicing.

These manhole covers could become missiles in the event 1.55 of a gasoline vapor explosion within the Peggs Run culvert.

This 1.56 accident scenario was investigated in detail.

The "run-up" distance for gasoline vapor detonation is approximately 1.57 100 feet. Since gasoline vapor is postulated to be confined in a 1.58 1,800 foot long culvert, a detonation was postulated to occur within 1.59 the Peggs Run culvert. The result shows that the maximum impact 1.60

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range for a manhole cover,m(ssile is approximately 70 feet. The 2.1 nearest safety-related structure (the BVPS-2 diesel generator building) is approximately 600 feet from the nearest manhole. Thus, 2.3 manhole cover missiles generated by. a gasoline vapor explosion within the Peggs Run culvert are not a safety concern.

2.4 Peggs_ Run flows into the Ohio River. A double-ended rupture of the 2.6 pipeline on the hillside above Peggs Run will result in gasoline l

eventually draining into the Ohio River. The gasoline vapor could 2.8 accumulate within the Peggs Run culvert as well as.at the exit end of Peggs Run. Therefore, a gasoline vapor explosion at the exit end 2.9 of Peggs Run was postulated to occur, although formation of a combustible mixture is less likely than within the culvert. The 2.11 results of this analysis show that the incident pressure imposed on the diesel generator building is 0.7 psi, which is equivalent to 2.8 2.12 psi reflected pressure. The thermal flux imposed on the diesel 2.13 a

generator building is 2,704 watts /m. Again, tne calculated thermal 2.14 flux can be compared with the 1,000-1,250 watts /ma peak solar flux measured for Albuquerque, New Mexico.

As noted previously, the 2.16 thermal flux' generated by a gasoline vapor fire / explosion-will be short in duration. Therefore, the calculated thermal flux is not a 2.17 safety hazard to the diesel generator building.

Finally, certain conservatisms in the analysis of the pipeline 2.18 rupture scenarios should be noted. In all calculations, the effects 2.19 of pressure and thermal flux were assumed to be transmitted along the straight line of sight to the target (the diesel generator 2.20 building). In reality, the effects of incident pressure and thermal 2.21 fluxes would be considerably attenuated by the favorable terrain 2.22 topographic features of.the BVPS-2 site.

For example, the effects 2.23 of pressure and thermal flux is reduced for a gasoline explosion at both. sites discussed earlier. When an explosion is centered at the 2.25 nearest site to the diesel generator building, the elevated Route 168 platform blocks the direct line of sight. 'Similarly, when the 2.27 explosion is centered at the exit end of the Peggs Run culvert, the depth of the Peggs Run ravine blocks the direct line of sight.

2.28 311.7-2

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only gasoline, kerosene, and b e. tin; oil are beir.g The FSAR indicates that Indica te w'.t e.: 7rovisions here transported throur,h the Mobil Oil pipeline.

been made to prevent-liquified petroleum gas from being

.c r rt ec'.

in this pipeline through the Beaver Valley exclusion area.

Res pons e :

Mr. Ancel Bell of the Mobil Pipeline Company (Mobil Pipeline Company 1984) c onfirmed that the Mobil Pipeline Company has no plans to put thS !.ine into L?C service.

Reference:

^

Mobil Oil Pipeline Compc.ny 1984,.' letter frem Bell A. D.

Mobilu Oil Pipeline Company to 'Jashabaughi R. J.

Duquesne Light Company, dated May 14,-1984 eew+

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