ML20062E384

Advises That 900914 Proposed Rev to Exam Schedule for Class 1 Nozzles Complies W/Asme Section XI Code XI-1-86-74

ML20062E384
Person / Time
Site:	South Texas
Issue date:	11/06/1990
From:	Linville J Office of Nuclear Reactor Regulation
To:	Hall D HOUSTON LIGHTING & POWER CO.
References
TAC-77522, TAC-77623, NUDOCS 9011200170
Download: ML20062E384 (3)

Text

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a fy ' nov,k UNITED STATES 4

g NUCLEAR REGULATORY COMMISSION l ' j 1, r,*

<l WASHINo ton, D. C. 20655 p

... ../ November 6, 1990 ,

Docket Nos. 50-498 and 50-499 i

Mr. Donald P. Hall

- Group Vice-President, Nuclear Houston Lighting & Power Company P.O. Box'1700 Houston, Texas 77251

SUBJECT:

EXAMINATION OF CLASS 1, CATEGORY B-D VESSEL N0ZZLES, SOUTH TEXAS PROJECT, UNITS 1 AND 2 (TAC N05. 77522 AND 77623)

By letter dated. September 14, 1990, Houston Lighting & Power Company (HL&P) submitted _to the NRC a proposed revision to the examination schedule for Class 1 nozzles ^at the South Texas Project, Units 1 and 2.- The proposed revision

? entails rescneduling.the examinations of the reactor vessel outlet nozzles' as 4- documented =in the Inservice Inspection Plan from the first forty-anth period of the first ten year interval to the third forty-month period of the ten year, t

interval. Instead it is- proposed that the steam. generator and pressurizer nozzles -are '_' equivalent" to .the reactor vessel outlet nozzles ar.ci would satisfy

, ;the: code 1 scheduling requirements. - L.L&P stated that by making 'he proposed change,Jit would minimize examination costs and support the A. '.ow- As-

. Reasonably-Achievable (ALARA). program by reducing radiation exposure to plant and non-destructive examinat on (NDE) vendor personnel.

tThe staff has : reviewed the proposed rescheduling of the examinations of the reactor vesselinozzles and the basis stated in the Attachment to the September 14,.

11990,tletter. :The11nservice Inspection Plan.for South Texas' units 1 and 2 is based on the 1983 Edition ~through Summer 1983 Addenda' of Section XI, in

which Footnote 2 of Table IWB-2500-1 allows flexibility-infthe scheduling of- '

F s nozzle . examinations of the reactor vessel, pressurizer, steam generators,: and -

heat exchangers and implies.that the nozzles are " equivalent." - Tne Footnote

. allows any of the' nozzles to be examined during,the first period'of the-interval sas.long as. the number'of' nozzles comprise 25 to 50 percent of' the total number.

-The remainder'of-the. nozzles are allowed to be examined at.or near the end of theLten year. interval. Therefore. the proposed rescheduling of the reactor-vess'el nozzles is in compliance with the Code, assuming that the nozzles examined inleach Unit'during the first 40-month period total 25 to 50 percent-4 of the Category B-D nozzles-listed in Table 1 of the Attachment to the

.M .ieptember 14,1990, letter. "However, if HL&P decides to implement the proposed

. schedule change, the . sample examined during the first 40-month period should include some steam generator nozzles and stne pressurizer nozzles because the sample should be representative of the entire B-D ce'.egory. population.

9011200170 901106 8

• DR ADOCK 0500 9

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. I 8 Mr. Donald P. Hall -2 November 6, 1990 As part of the basis for rescheduling the nozzle examinations, HL&P referenced ASME Code Interpretation No. XI-1-86-74. This Interpretation allows examinations to be scheduled by categories rather than item numbers. Although this interpretation is not the basis for the staff's conclusion that HL&P is in compliance with the Code in rescheduling the nozzle examinations, the ASME Section XI Code Interpretation No. XI-1-86-74 that allows examinations to be scheduled by category rather than item numbers within the category cannot be applied generically to all categories as it implies. If so done, the sample of components chosen for examination might not be representative of components subjected to different inservice operating and environmental conditions, thereby defeating the efficacy of the inservice inspect %a pegram to detect inservice flaws and failures.

Sincerely, (ORIGINAL SIGNED BY)

James C. Linville, Acting Director Project Directorate IV-2 Division of Reactor Projects - III, IV, V and Special Projects Office of Nuclear Reactor Regulation cc: See next page DISTRIBUTION

.Dockett Fi_lew EPeyton NRC & Local PDRs GDick PDIV-2 Reading OGC DCrutchfield EJordan MVirgilio acRS (10)

JLinville BJones, RIV GJohnson CCheng, EMCB

• SEE PREVIOUS CONCURRENCES

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DATE : 11/01/90*  : 11/01/90*  : 11/p/90  : 11/I/90  :  :

OFFICIAL RECORD COPY Document Name: LETTER TO HL&P/77622 & 77623

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,:  ?~

A Mr. Donald-P. Hall November 6, 1990' cc

Senior Resident Inspector Jack R. Newman, Esq.

U.S. Nuclear Regulatory Commission Newman & Holtzinger, P.C.

P. 0. Box 910 1615 L Street, N.W.

Bay City, Texas 77414 Washington, D.C. 20036 Mr. J. C. Lanier/M. B. Lee Licensing Representative City lofAustin Houston Lighting and Power Company Electric Utility Departrant Suite 610 P. 0. Box 1088 Three Metro Center Austin,l Texas 78767 Bethesda, Maryland 20814-

-Mr. R. J. Costello Bureau of Radiation Control Mr. M. T.- Hardt State of Texas City Public Service Board 1101 West 49th Street P. O. Box 1771 Austin, Texas 78756 San Antonio, Texas 78296

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'Rtfus S. Scott Mr. R. P..Verret Associate General Counsel Mr.'D..E. Ward . Hcuston Lighting & Power Company _

Central = Power-and-Light Company P. O. Box 61867 P. 0.-Box 2121 Houston, Texas 77208 .

Corpus Christi,' Texas 78403 4 INP0 Records' Center.

1100 Circle'75 Parkway Atlanta, Georgia- 30339-3064 Regional Administrator, Region IV

U.S. Nuclear Regulatory' Commission 611 Ryan Plaza Drive, Suite 1000

, -Arlington, Texas' 76011-

.s Mr. Joseph M._Hendrie-t 50 Be11 port Lane Be11 port, New York 11713-

3' ' Judge, Matagordt County

.Matagorda Jounty Courthouse

, :1700 Soveath Street-Bay City, Texas 77414-L Mr. M. A.' McBurnett Manager, Operations Support Licensing Houston L10hting & Power Company

.P. 0. Box ^289 r 'Wadsworth,' Texas 77483 4 ,

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