ML19343A612

Requests Addl Info Re LOCA Spectrum Analyses for NRC Review of FSAR Through Revision 40

ML19343A612
Person / Time
Site:	McGuire, Mcguire
Issue date:	11/05/1980
From:	Tedesco R Office of Nuclear Reactor Regulation
To:	Parker W DUKE POWER CO.
References
NUDOCS 8011190137
Download: ML19343A612 (2)

Text

I l

, _. _/

f "%e,'o, k&

UNITED STATES

!j

_f.. ( '

i NUCLEAR REGULATORY COMMISSION c

W ASHINGTO N, D. C. 20S55 "5

$3 5

s..u ]

NOV 0 5 4980 G

t

(

Docket Nos.:

50-369 h

I 1

and 50-370 3,

y E!2 L...

b E

Duke Power Company ATTN: Mr. William 0. Parker, Jr.

~'j to Vice President - Steam Production g

g P. O. Box 33189 2

422 South Church Street Charlotte, North Carolina 28242

SUBJECT:

LOCA ANALYSIS (MCGUIRE NUCLEAR STATION, UNITS 1 AND 2)

As a result of our review of your LOCA spectrum analyses (FSAR revision 40) we require some additional information:

LOCA analyses for McGuire 1 and 2 have exhibited a trend of increasing calculated peak cladding temperature (PCT) with decreasing discharge coefficient (CD) for guillotine breaks (DECLG) with imperfect mixing assumed (imp). The analysis for DECLG Cd=0.4 imp gives a PCT of 2126 degrees F which is only 21 degrees F below the limiting design basis LOCA (DECLG, Cd=0.6 perfect, PCT =2147).

It is understoond that split breaks behave comparably to guillotine breaks with effectively smaller Cd's.

Justify that split breaks with imperfect mixing assumed (i.e., Cd=0.6 imp., or Cd=0.4 imp) are not limiting for McGuire 1 and 2.

We will require that this matter be resolved prior to exceeding 5 percent of full power. We therefore request your early response.

Sincerely, T.As0 R. L. Tedesco, Assistant Director for Licensing Division of Licensing cc: See next page 8011190 %

Mr. William 0. Parker, Jr.

Vice President, Steam Production Duke Power Company P. O. Box 2178 422 South Church Street Charlotte, North Carolina 28242 cc: Mr. W. L. Porter David Flesichaker, Esq.

Duke Power Company 1735 Eye Street, N. W.

P. O. Box 2178 Suite 709 422 South Church Street Washinoton, D. C.

Charlotte, North Carolina 28242

~

20006 Richard P. Wilson, Esq.

Mr. R. S. Howard Assistant Attorney General Power Systems Division State of South Carolina Westinghouse Electric Corporation 2600 Bull Street P. O. Box 355 Columbia, South Carolina 29201 Pittsburgh, Pennsylvania 15230 Office of Intergovernmental Relations '

Mr. E. J. Keith 116 West Jones Street EDS Nuclear Incorporated Raleigh, North Carolina 27603 220 Montgomery Street San Francisco, California 94104 County Manager of Mecklenburg County 720 East Fourth Street Mr. J. E. Houghtaling Charlotte, North Carolina 28202 NUS Corporation 2536 Countryside Boulevard U. S. Environmental Protection Agency Clearwater, Florida 33515 ATTN:

EIS Coordinator Region IV Office Mr. Jesse L. Riley, President 345 Courtland Street, N. II.

The Carolina Environmental Study Group Atlanta, Georgia 30308 854 Henley Place Charlotte, North Carolina 28207 Mr. Tom Donat Resident Inspector McGuire NPS J. Michael McGarry, III, Esq.

c/o USNRC Debevoise & Liberman Post Office Box 216 1200 Seventeenth Street, N. W.

Cornelius, North Carolina 28031 Washington, D. C.

20036 Robert M. Lazo, Esq., Chairman Atomic Safety and Licensing Board U. S. Nuclear Regulatory Commission Washington, D. C.

20555 Dr. Emmeth A. Lueb'ke Atomic Safety and Licensing Board i

U. S. Nuclear Regulatory Commission Washington, D. C.

20555 Dr. Cadet H. Hand, Jr., Director Bodega Marine Lab of California P. O. Box 247 Bodega Bay, California 94923 d

9

,,, -