ML18018B883

Forwards Request for Addl Info Re Calculation of Conditions within Compartment Containing Three MSIVs That Can Result from Steam Line Break,Taking Into Account Possible Occurrence of Superheat Conditions

ML18018B883
Person / Time
Site:	Harris
Issue date:	12/10/1984
From:	Knighton G Office of Nuclear Reactor Regulation
To:	Utley E CAROLINA POWER & LIGHT CO.
References
NUDOCS 8502110008
Download: ML18018B883 (7)

Text

Docket No.:

50-400 P IÃf>

OEC10 1984

/p4 Mr. E.

E. Utley, Executive Vice President Power Supply Im Engineering 8 Construction Carolina Power and Light Company Post Office Box 1551 Raleigh, North Carolina 27602

Subject:

Request for Additional Information - Shearon Harris, Unit 1 A generic deficiency relating to the omission of the consideration of superheat in the main steam line break analysis for Westinghouse plants has been identified.

To conform with the criteria of Standard Review Plan Section 3.6. 1, "Plant Design for Protection', Against Postulated Failure in Fluid Systems Outside Containment,"

we request tha't you conduct an analysis for Shearon Harris, Unit 1 which will include the consideration of possible superheat in the calculation.

Please respond to the enclosed request for additional information within 90 days of receipt of this letter.

Sincerely, Olt(QINALSlGNED BY

Enclosure:

's stated cc:

See next page 5

DISTRIBUTION

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Mr. E.

E. Utley Executive Vice President Power Supply and Engineering and Construction Carolina Power 5 Light Company Post Office Box 1551 Raleigh, North Carolina 27602 George F. Trowbridge, Esq.

Shaw, Pittman, Potts 5 Trowbridge 1800 M Street, NW Washington, DC 20036 Richard E. Jones, Esq.

Associate General Counsel Carolina Power 5 Light Company 411 Fayetteville Street Mall

Raleigh, North Carolina 27602 M. David Gordon, Esq.

Associate Attorney General State of North Carolina Post Office Box 629

Raleigh, North Carolina 27602 Thomas S. Erwin, Esq.

115 W. Morgan Street Raleigh, North Carolina 27602 Mr. George Maxwell Resident Inspector/Harris NPS c/o U.S. Nuclear Regulatory Commission Route 1, Box 315B New Hill, North Carolina 27562 Charles D. Barham, Jr.,

Esq.

Vice President 5 Senior Counsel Carolina Power 5 Light Company Post Office Box 1551 Raleigh, North Carolina 27602 Mr. John Runkle, Executive Coordinator Conservation Council of North Carolina 307 Granville Road Chapel Hill, North Carolina 27514 Mr. Wells Eddleman 718-A Iredell Street Durham, North Carolina 27705 Shearon Harris Mr. George Jackson, Secretary Environmental Law Project School of Law, 064-A Univeristy of North Carolina Chapel Hill, North Carolina 27514 Dr. Phyllis Lotchin 108 Bridle Run Chapel Hill, North Carolina 27514 Mr. Travis Payne, Esq.

723 W. Johnson Street Post Office Box 12643

Raleigh, North Carolina 27605 Mr. Daniel F.

Read CHANGE Post Office Box 2151

Raleigh, North Carolina 27602 Bradley W. Jones, Esq.

U.S. Nuclear Regulatory Comm.

Region II 101 Marietta Street Atlanta, Georgia 30303

,Richard D. Wilson, M. D.

725 Hunte'r Street-Apex, North Carolina'7502

'Regional Administrator '- Region II U.S'. Nuclear Regulatory Commission 101 Marietta Street Suite 3100 Atlanta, Georgia

,30303 Mr. Robert P. Gruber Executive Director Public Staff -

NCUC Post Office Box 991

Raleigh, North Carolina 27602 l

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QUESTION CONCERNING STEAM LINE BREAK ANALYSIS WHEN CONSIDERING SUPERHEAT Calculate conditions within the compartment containing the three main steam isolation valves that can result from a main steam line break, taking into account the possible occurrence of superheat conditions.

Provide the results of that calculation including the following parametric information with regard to that break (Items 1-4, below):

I.

With respect to the pipe to be broken, we need to know the:

a.

Type of fluid {water or steam);

b.

Temperature; c.

Pressure; d.

Source of the'luid; e.

Flow rate (or assumed flow rate) versus time;:and f.

Enthalyy versus time With respect to the compartment being analyzed; a.

Number of compar'tments analyzed; b.

For each compartment, including contiguous compartments:

i.

initial temperature ii. initial pressure iii. initial humidity iv.

total floor area and floor space occupied. by equipment (square feet) v.

number of vents and vent areas (square feet) for each vent; and vi.

compartment wall height (feet) and c.

Simple compartment and interconnection diagram.

3.

All assumptions

used, including but not limited to the:

a.

Orifice coefficient; b.

Fluid expansion factor; c.

Heat transfer coefficient for heat through the walls; and d.

Single active failures that were considered in the analysis 4.

Utilities analysis results:

a.

Temperature versue time curve (peak temperature specified);

b.

Pressure versus time curve (peak p'ressure specified);

and c.

Humidity versus time curve

{peak humidity specified)