ML20148F781

Requests Util to Revise Proposed Tech Specs Re Steam Generator Tube Surveillance Per Jul 1975 Revision 1 of Reg Guide 1.83.Model Tech Specs Re Steam Generator Inservice Insp Encl

ML20148F781
Person / Time
Site:	Yankee Rowe
Issue date:	09/10/1976
From:	Schwencer A Office of Nuclear Reactor Regulation
To:	Groce R YANKEE ATOMIC ELECTRIC CO.
Shared Package
ML20148F784	List: ML20148F781
References
NUDOCS 8011060731
Download: ML20148F781 (3)

Text

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t SEP 101976

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Docket No. 50-29 _

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Yankee Atomic' Electric Company i ATTNr Mr. Robert H. Groce

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~'l General Desips.Crite'ria (60C)l. 30 and n(A 32 ofx Appendix A to 10 CFR Part 50

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t require ;theticomponents that are part of the reactor coolar.t pressure .

boundary receive periodic inspection and testing of c,ritical areas to

assess:their structural;and leaktight:integetty. LThe steam generator f tubes constitete'ever 50% of, the area :of the total ~ primary system -

, . pressure-retaining boundary in pressu~rized-water reactors. Our letter dated ~

' July 18,1974;' requested you to propose suitable' technical specifications

for the serve 111ance of the' steam' generator tubes consistent with the

. , requirements of the GDC and. Regulatory Guide 1.83 titled " Inservice In- 1 fspection of Pressurized Water Reactor Stean Generator Tubes." Since your

' proposal was submitted,'R.G.1.83 has1been revised; therefore, we request that you revise your submittal to.be consistent with the enclosed model t technical specf fications.which are based on Revision.1 'of R.G.1.83, dated July. 19756 . ~ N ; >' -

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s Both' the Loriginal ande rer)se. d R.G.;).83; refer .to;aitube plugg. ing limit and plugging criteria.ibut neitherlprovides guidance on how'these are to ,

i be quantifled.? LThe, plugging, limit in)theLenclosed ~model technical specifi- f~

4 Lcations is based,an the minimum tube wellithickness'needed to maintain tube integrity duringfa;LOCA combined.with a safe shutdown earthquake and '

'an operational' allowance to account forJ time intervals between inspections. ..

i We have concluded that plugging limits.that are based on these considerations '

. : satisfy the requirements of the GDC and. are acceptable .to us.

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>-  : operation should be included the (leakage technical- limitspecif1 and'allimiting cations;tocondition ensure timely for :*

. action lin therevent of steam generator. tube, degradation. A leakage limit i ;such as the

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! 'ankee Atomic Electric Company Y 2- SEP 101976 l

t Certain steam generators have completed the first cycle of operation l

1 with tube inspection results that have indicated little discern- .

> ible degradation. - These early-in-life inspection results may not be indicative of the total 40 year design life of steam generator tubes in terms of tube integrity. Therefore, we have concluded .that sur-l veillance of steam generator. tube integrity should be covered by technical specifications for all facilities including those where early inspection t

! . cycles have not indicated any discernible or increasing degradation. I i ,

e; The enclosed model technical specifications gives credit for favorable - ,

early.: inspection _results by; extending subsequent. inspection intervals ,

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Je request that within 45.~ days;~ ef receipt'of this ' letter / you revise or i -

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resubeit your request for a'licen;se' amendment using the enclosed model '  ;

l , technica1Lspecifications .for guidance. The model . technical. specifications -

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. Lshould be' appropriately; adapted :tolyour spectfic' format and to the number '

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s Yankee Atomic Electric Company September 10, 1976 cc: Mr. Donald G. Allen, President Yankee Atomic Electric Company 20 Turnpike Road Westboro, Massachusetts 01581 Greenfield Public Library 402 Main Street Greenfield, Massachusetts 01581 i

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