ML19345F038

Expresses Concern Re Implementation of Section XI of Boiler & Pressure Vessel Code.Wording in Regulation Should Be Reviewed for Clarity of Requirements & Intent.Code Comparison Table Encl

ML19345F038
Person / Time
Site:	LaSalle
Issue date:	01/27/1981
From:	Chockie L AMERICAN SOCIETY OF MECHANICAL ENGINEERS
To:	Anderson W NRC OFFICE OF STANDARDS DEVELOPMENT
Shared Package
ML19345F035	List: ML19345F034 ML19345F038
References
NUDOCS 8102060565
Download: ML19345F038 (3)

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The American s'ociety or u ch nic=i ensin r=

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• 345 E 47t9 St. New Yorm N Y 10017

• 212 644-7722

• TWX-710 5815267 THE BolLER AND 3 3 0 1980 PRESSURE VESSEL Ja1.uay 27,1981 COMMITTEE Chartman W. L. H ARDING Dr. W. F. Anderson E. E M ER . . clear Regdaton Codssion Structures & Components Standards Branch s,erer ev Washington, D.C. 20555 G. M. EISEN B ERG B.W.BAcE R.o.sONNER SuDject: Implementation of Section XI of the AShE. Boiler and R. J. BOSN AK Pressure Vessel Code M. N. BR ESSLER V.W. BUTLER D. A. CANONICO

Dear Dr. Anderson:

9. J. CEPLUCH

. J. cHOCKIE The Concern which I wish to express is the apparent misunderstanding W D. DOTY and Confusion relative to the requirements in 10CFR50. When an Owner 8', ,,c, G. EAR(UP NH adoptsSection XI,1974 edition through summer 1975 addenda, the intent R. M. GiBSON was that the requirements stipulated that the plant would complete one R. C. G RIF F IN full interval of 120 months ..i inspections and all the requirements stipu-S. F. HARRISON lated in the code would be ccomplished during this interval. Different E. J. H EklY opinions have been EXprest d by several members of the NRC staff that J

f,CoFF ,eKAY the Owners should upgrade heir program to latter editions and addenda W. R. Mf KESELL of Section XI when only as 1 itle as one third of the interval and program R. H. MO ELLE R have been completed.

F. N. MOSCHIN t T. E. NORTHUP hiay we encourage that the wording in the regulation be carefully reviewed

• ' ,0l ,"*goy "

• E" and revised if necessary, so that the requirements and intent become A.T.SLATT Perfectly clear.

• W. R. SMITH. SR.

W. E. SOM ERS Sinca: rely, J

W,. A fC U L. J. Chockie, Chairman SC on Nuclear Inservice Inspection

/lb cc: A. Toboada W. O. Parker K. I. Baron Dick Hooper /

RECENED

, . !? Ol'S R. C. HT7 Member of Accreditation Board for Engmeerme end Technology and Amencan Association of Enemeering Scenties 8102060

INSTAL,LATION & SERVICE ENGINEERING OlVISION LaSalle County Station {

Inservice Inspection Program ASME Section XI Code Comparison TABLE

• S75 vs 578 ASME Section XI Current ISI Procram - S75 578 Recuirenent TABLE IWB-2500 Inspect 10% length of longi- 100% of all weld seams.

Category B-A tudinal seam / interval and 5%

length of circumferential seam / interval.

TABLE IWB-2500 (6) Interior Clad Patches VT Deleted this category.

Category B-I-1 & PT Inspection.

TABLE IWB-2500 Inspect 25% of all welds / Inspect 25% of all welds / interval Category B-J interval. and includes welds:

1) at teminal ends;

2) with primary and secondary stress intensity of 2.4S g;

3) with ctsnulative usage factcr U of 0.4.

These welds may be scheduled by loop. (See 1977 Edition).

TABLE IWB-2500 Inspect RPV closure nuts when Inspect RPV closure nuts with Category B-G-1 removed, both volumetric and surface method.

surface methods.

TABLE IWB-2500 Insoect 25%/ interval of all Inspect (1) those supoorts with Category B-K-1 integrally welded supports. support base material design thickness 5/8" and greater.

(2) 100% of support attachnents of piping required to be examined by Category B-J and attachments of associated pumps and valves integral to such piping.

• Comparison is based on major differences and does not contain similarities.

iss mmans' GEN ER AL $ ELECTRIC

INSTALL ATION & SERVICE ENGINEERING DIVISION Page 2 ASME Section XI Current ISI Program - S75 S78 Recuirement TABLE IWC-2500 Inspect 5%/ interval of the Inspect 100%/ interval, vessel (IWC-2520,S75) vessel welds. welds.

Category C-A Category C-B Inspect nozzle welds Inspect welds " and less in volumetrically. thickness with surface method.

Inspect welds over " with surface and volumetric methods.

Category C-C, Inspect 100%/ interval of Inspect (1) vessel support base

& C-E-1 integrally welded supports. material thickness that exceeds

"; (2) pipe, pump and valve base material thickness that exceeds 3/4 inch; (3) number limited to supports of those components required to be examined by Categories C-F and C-G.

TABLE IWC-2500 Visually inspect hangers Visually inspect hangers and (etc.) and snubbers. snubbers and confim function Category C-E-2 operability.

Category C-F Inspect 25%/ interval of all Inspect 100% of the following welds volumetrically, welds / interval with surface and volumetric methods:

j 1) welds with the stsn of egs.

l 9 and 10 in NC-3652 exceed O.8 (1.2Sn + SA }i

2) welds at terminal ends; l

l 3) additional welds at structural discontinuities such that 50%

of main steam and 25% of all other system welds are inspected.

NDE Techniques

' The S78 Section XI contains more indication evaluation and acceptance standards, including acceptance standards for piping welds. The procedure requirements, calibration standards, etc., are relatively the same between the ISI Program and the S78 Section XI Appendix III. The major difference is establishing UT sensitivity using notches (S78) versus holes (575) with the latter being approximately twice as sensitive.

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GENER AL $ ELECTRIC

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