ML20248B727

Grants Exception to Action 2 of NRC Bulletin 88-008, Thermal Stresses in Piping Connected to Rcs

ML20248B727
Person / Time
Site:	Mcguire
Issue date:	09/15/1989
From:	Hood D Office of Nuclear Reactor Regulation
To:	Tucker H DUKE POWER CO.
References
IEB-88-008, IEB-88-8, TAC-69649, TAC-69650, NUDOCS 8910030272
Download: ML20248B727 (4)

Text

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4* o g UNITED STATES i

! n NUCLEAR REGULATORY COMMISSION

. , $  ; WASHINGTON, D. C. 20555

+.... September 15,'1989 Docket'Nos. 50-369 and 50-370 Mr. H. B. Tucker, Vice President l Nuclear Production Department Duke Power Company 422 South Church Street L

Charlotte, North Carolina 28242

SUBJECT:

MCGUIRE UNIT 2 EXCEPTION FROM BULLETIN 88-08, THERMAL STRESSES IN PIPING CONNECTED TO REACTOR COOLANT SYSTEMS (TACS 69649 AND 69650)

Action 2 of NRC Bulletin 88-08 requests licensees to nondestructively examine welds, heat-affected zones, hiDh stress locations, and geometric discontinuities in unisolable sections of piping connected to the reactor coolant system (RCS) that may have been subjected to excessive thermal stresses.

By letter dated August 8,1989, you requested a partial exception from the inspection requirements of Action 2 of Bulletin 88-08 regarding two inaccessible elbows in the McGuire Unit 2 safety injection _ piping to the "D" RCS cold leg.

Inspection of these two elbows would wquire removal of aipe whip restraints -

and result in an estimated 20-25 un-rem dose for the jo). In lieu of this inspection, you committed to install temporary temperature instrumentation to monitor the thermal conditions of the safety injection piping. Your August 18, 1989 letter provided additional information regarding both the temperature instrumentation to be installed on all four safety injection-lines and the plans for collecting temperature data during various modes of plant operation and for analyzing the data collected. ,

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The NRC staff has reviewed your exception request and its bases, taking l particular note of the following: l l 1. The safety injection piping is of small diameter (1-1/2 inches) and i l is, therefore, not likely to experience thermal stratification.

2. Similar piping inspected on McGuire Unit I and Catawba Units 1 and 2 did not have indications of' excessive thermal stresses. j We find that your commitment to install temporary temperature instrumentation i and to analyze the thermal conditions of this piping provides an adequate Alternative to inspection of the two elbows. Moreover, the inspection-of the ,

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Mr. H. B. Tucker two elbows for McGuire Unit 2 does not warrant the estimated dose that your personnel would receive te view of your proposed acceptable alternative.

Therefore, your exception to action 2 of Bulletin 88-08 is granted. We request j that the results of the temperature. monitoring program be reported to the NRC prior to restart from the next Unit 2 refueling outage. . This should include your analysis conclusions and your recommendations regarding continued monitoring.

Should you have questions, contact me at (301) 492-1442.

1 Sincerely, lbkl= N. l,-

Darl S. Hood, Project Manager Project Directorate 11-3 Division of Reactor Projects-I/II Office of Nuclear Reactor Regulation cc: See next page

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' Mr. H. B. Tucker Duke Power Company McGuire Nuclear Station CC:

Mr. A.V. Carr, Esq. Dr. John M. Barry Du ke Power Company Department of Environmental Health P. O. Box 33189 Mecklenburg. County 422 South Church 15treet 1200 Blythe Boulevard Charlotte, North Carolina 28242 Charlotte, North Carolina' . 28203 County Manager of Mecklenburg County Mr. Dayne H. . Brown, Chief 720 East Fourth Street Radiation Protection Branch

. Charlotte, North Carolina 28202 Division of Facility Services -

Department of Human Resources.

701 Barbour Drive Mr. J. S. Warren Raleigh, North Carolina . 27603-2008 Du ke Power Company Nuclear Production Department Mr. Alan R. Herdt, Chief '

P. O. Box 33189 Project Branch #3 Charlotte, North Carolina 28242 U.S. Nuclear Regulatory Commission' 101 Marietta Street, NW, Suite 2900.

J. Michael McGarry, III, Esq. Atlanta, Georgia 30323 Bishop, Cook, Purcell and Reynolds 1400 L Street, N.W. Ms. . Karen E. Long-Washington, D. C. 20005 Assistant Attorney General-N. C. Department of Justice Senior Resident Inspector P.O. Box 629 c/o U.S. Nuclear Regulatory Commission - Raleigh, North Carolina 27602 Route 4, Box 529 Hunterville, North Carolina 28078 Regional Administrator, Region II-U.S. Nuclear Regulatory Commission 101 Marietta Street, N.W., Suite 2900-Atlanta, Georgia 30323 Ms. S. S. Kilborn Area Manager, Mid-South Area ESSD Projects Westinghouse Electric Corporation MNC West Tower - Bay 239 P. O. Box 355 Pittsburgh, Pennsylvania 15230 li

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. Mr. H. B. Tucker ,

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' two elbows for McGuire Unit 2 does not warrant the estimated dose that your personnel would receive ir view of your proposed acceptable alternative.

Therefore, your exception to action 2 of.Bulletin 88-08 is granted. We request that the results of the temperature monitoring program be reported to the NRC prior to restart from the next Unit 2 refueling outage. This should include your analysis conclusions and your recommendations regard 53 continued monitoring.

Should you have questions, contact me at (301) 492-1442.

Sincerely ,

l Original Signed By:

Kahtan N. Jabbour for Darl S. Hood, Project Manager Project Directorate II-3 Division of Reactor Projects-1/II Office of Nuclear Reactor Regulation cc: See next page i

DISTRIBUTION ,

4 Docket + Filef C NRC PDR Local PDR PDII-3 Reading S. Varga 14-E-4 G. Lainas 14-H-3 D. Matthews 14-H-25 M. Rood 14-H-25 L. Wiens 14-H-25 T. Reed 14-H-25 D. Hood 14-H-25 OGC. (For inform. Only) 15-B-18 E. Jordan MNBB-3302 l B. Grimes 9-A-2

-ACRS(10) P-315 l [McGuire Plant File]

[ TUCKER LTR 8/25] )j MRood II-3 T

h d:cb 1 P)I 3 PDII 3 od DMatthews

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