ML18026A386

Summary of 820317 Meeting W/Util Re Analysis Used by Util to Evaluate Consequences of Gas Pipeline Break & Effect on Facility

ML18026A386
Person / Time
Site:	Susquehanna
Issue date:	03/25/1982
From:	Perch R Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 8204210632
Download: ML18026A386 (15)

Text

gN aS 1982 DISTRIBUTION:

See attached page Docket Nos. 60-387/388 APPLICANT:

Pennsylvania Power 5 Light Company FACILITY:

Susquehanna Steam Electric Station, Units 1 and 2

SUMMARY

OF MARCH 17, 1982 GAS PIPELINE MEETING On March 17, 1982, representatives of the Pennsylvania Power 8 Light Company and their consultant from Gilbert Associates met with members of the NRC staff to discuss the analysis used by PPKL to evaluate the consequences of a gas pipeline break and its effect on the Susquehanna facility.

A list of attendees is provided in Attachment 1.

The applicant utilized an adiabatic, constant enthalpy model in analyzing the consequences of a gas pipeline break.

The applicant also provided a

letter from an outside source to confirm their use of this model was correct (Attachment 2).

Based on this model, the applicant felt that overall changes in gas temperatures would be less than 20', limiting the absorption of moisture, and therefore have minimal effect on the rise of the gas above control room air intakes.

The staff had previously performed an independent analysis which showed the applicant's analysis to be non-conservative, par ticularly in the areas of initial gas expansion with a resulting cooldown and reduced

buoyancy, as well as the considerable 'uncertainty associated with the predicted heights of rise given by the plume rise formulae and the complex topography represented by the pipeline and plant configuration.

The information provided by the applicant at this meeting did not alter the staff position-.

The current staff position is the pipeline, in absence of a conservative analysis which addresses and satisfactorily resolves the staff concerns, needs to be relocated to a distance where a rupture will have no adverse effects upon the plant.

82042i0632 820325 PDR ADOCK 05000387 A

PDR Attachments:

As stated Robert L. Perch, Project Manager Licensing Branch No. 2 Division of Licensing cc:

See next page OFF1cEP DL:LB DL

/BC

<<>>>>,~

RPerch:kw ASc we cer oATa p ".3/~/82 3/

/82 NRG FORM 318 (10-80) NRCM 0240 OFF)CIAL RECORD COPY USGPO: 1981~m~980

Mr., Norman W. Curtis Vice President Engineering and Construction Pennsylvania Power

& Light Company Allentown, Pennsyl vania 18101 ccs:

Jay Silberg, Esquire Shaw, Pittnan, Potts

& Trowbridge 1800 M Street, N.

W.

Washington, D. C. 20036 Edward M. Nagel, Esquire General Counsel and Secretary Pennsylvania Power

& Light Company 2 North Ninth Street Allentown, Pennsylvania 18101 fir. Willian E. Barberich Nuclear Licensing Group Supervisor Pennsylvania Power

& Light Company 2 North Ninth Street Al 1 entown, Pennsylvania 18101 Mr. G.

Rhodes Resident Inspector P. 0.

Box 52 Shickshinny, Pennsylvania 18655 Gerald R. Schultz, Esquire Susquehanna Environmental Advocates P. 0.

Box 1560 Wilkes-Barre, Pennsylvania 18703 Mr. E. B. Poser Project Engineer Bechtel Power Corporation P. 0.

Box 3965 San Francisco, California 94119 Dr. Judith H. Johnsrud Co-Director Environmental Coalition on Nuclear Poser 433 Orlando Avenue State College, Pennsylvania 16801 Mr. Thomas M. Gerusky, Director Bureau of Radiation Protection Resources Commonwealth of Pennsylvania P. 0.

Box 2063 Harrisburg, Pennsylvania 17120 Ms. Colleen Marsh P. 0.

Box 538A, RD 84 Mountain Top, Pennsylvania 18707 Mr. Thomas J. Halligan Correspondent The Citizens Against Nuclear Dangers P. 0.

Box 5

Scranton, Pennsylvania 18501 Mr. J.

W. Millard Project Manager Mail Code 395 General Electric Company 175 Curtner Avenue San Jose, California 95125 Robert W. Adler, Esquire Office of Attorney General 505 Executive House P. 0.

Box 2357 Harrisburg, Pennsylvania 17120

t

Attachment 1

List of Attendees NRC Staff PPKL R. Perch A. Sinisgalli L. Soffer N. Coddington D. Kohn A. I<ale R. Sgarro D. Ellis (Gilbert Assoc.)

OFFICE/

SURNAMEQ DATE P NRG FORM 318 (10-80) NRCM 0240 OFFICIAL R ECO R D COPY

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~ ye Whitaker Laboratory 5 Bethlehem, Pennsylvania 18015 I.ehigh University Department o

hemieal Engineering telephone (215) 861-4260 March 10, 1982 Mr. Donald J.

Kohn Fire Protection Engineer Nuclear Plant Engineering Pennsylvania Power.

& Light Company Two North Ninth Street Allentown, Pennsylvania 18101 Dear Mr. Kohn; This is a summary of my thoughts with respect to the technical questions discussed below.

What density must be assumed for natural gas escaping a

pipeline 'at 310 psig and 60'F (288'K)?

This value was needed for the estimation of the buoyancy F

(F = (p-po) gQ/mp) for the plume calculations described in the attached report.

The calculations described in the report had been made assuming an isoenthalpic expansion from the pipeline conditions to the atmospheric pressure.

The question raised,

however, was the following:

Is it possible to have

'any other type of expansion that would give a lower tempera-

ture, and consequently a higher density and lower or negative buoyancy7 The most dramatic case would correspond to a isoentropic expansion, since a rough estimation gives a temperature as low as 140oK.

Clearly this worst case condition would only occur in a well-designed nozzle.

The enthalpy change (a decrease in this case) would appear as kinetic energy of the gas.

The key point is that far enough from the gas exit this kinetic energy will dissipate into internal energy of the gas leaving the pipe and the air entrained by the jet.

The condition of the plume at, that point will be the same as if the gas had originally expanded along a constant enthalpy. line.

The plume buoyancy is shown below (for the conditions prescribed, methane at 280'K expands into air at 280 Kr 1 atm) to be essentially independent of the amount of air entrained and equal to that obtained assuming an isoenthalpic expansion.

The conclusion is then that the calculation of the buoyancy based in an isoenthalpic expansion is a correct one inde-pendently of the small scale process taking place in the neighbor-hood of the pipe.

0

Mr. Donald J.

Kohn March 10, 1982 Page 2

lf X could be of additional help, please do not hesitate in contacting me.

Sincerely, HSC;mr Enclosure J-r, Hu '-S.

Caram I

go

~-- Associate Professor

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MEETING

SUMMARY

DISTRIBUTION 0

k Ffl 5-I/

NRC PDR L PDR NSIC TERA TI C" OISE ACRS (16)

LB¹2 File H. Denton/E.

Case D. Eisenhut/R.

Purple A. Schwencer B.J.

Youngblood F. Miraglia E.

Adensam J.R. Miller G. Lainas R. Vollmer J.P.

Knight R. Bosnak F. Schauer R.E.

Jackson Project Manager R.L.

Perch

Attorney, OELD EHylton Tedesco G. Lear S. Pawlicki V. Benaroya Z. Rosztoczy W; Haass D. Muller R. Ballard W.

Regan R. Mattson F.

Congel

0. Parr F.

Rosa W. Butler R. Houston M. Srinivasan L. Rubenstein T. Speis W. Johnston J. Stol z S.

Hanauer W. Gammill W. Minners F. Schroeder D. Skovholt.

M. Ernst L. Hulman C. Berlinger K. Kniel G. Knighton A; Thadani J.

Kramer o

+Ay~

+lg, D. Ziemann

~cd Region Resident Inspe )

~NK R. Perch A. Sinisgalli L. Soffer bcc:

Applicant Service List

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