ML19241B658

Requests Addl Info on Inservice Insp Program Re Hydraulic Snubers,Closure Head Welds,Thread Roots & nozzle-to-vessel Welds of Shutdown Heat Exchangers

ML19241B658
Person / Time
Site:	Millstone
Issue date:	06/07/1979
From:	Reid R Office of Nuclear Reactor Regulation
To:	Counsil W NORTHEAST NUCLEAR ENERGY CO.
References
TAC-8320, NUDOCS 7907190789
Download: ML19241B658 (3)

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June 7, 1979

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Docket No. 50-336 Mr. W. G. Couns'1, Vice President Nuclear Engineering & Operations Northeast Nuclear Energy Company P. O. Box 270 Hartford, Connecticut 06101

Dear Mr. Counsii:

In the process of reviewing your proposed Inservice Inspection Program for the Millstone Unit No. 2, we find that additional information as detailed in the enclosure is needed to complete our review. The page references in the enclosure correspond to your January 25, 1979 submittal.

In order to complete our review in a timely manner, please provide the additional information by at least July 2,1979.

Sincerely,

.s! hfAJ nobert W. Reid, Chief Operating Reaccors Branch #4 Division of Operating Reactors

Enclosure:

Request for Additional Information cc w/ enclosure:

See next page v s.n hk sII r

J 10071.00727.,

Northeast Nuclear Energy Company cc:

William H. Cuddy. Esquire Day, Serry & Howard Counselors at Law One Constitution Plaza Hartford, Connecticut 06103 Waterford Pu' lic Library o

Rope Ferry Road, Route 156 Waterford, Connecticut 06385 Northeast Nuclear Energy Company ATTN:

Supp-:ntendent Millstone Plant Post Of fice Box 128 Waterford, Connecticut 06385 Northeast Utilities Service Company ATTN:

Mr. James R. Himmelwright Nuclear Engineering and Operations P. O. Box 270 Hartford, Connecticut 06101 Anthony Z. Roisman, Esq.

Natural Resources Defense Council 91715th Street, N.W.

Washington, D.C.

20005 Mr. John T. Shedlosky Nuclear Regulatory Commission, Region I Office of Inspection and Enforcement 631 Park Avenue King of Prussia, Pennsylvania 19406

Enclosure Millstone Unit 2 Inservice Inspection Program Request For Additional Inferration PAGE I-2 1.

Use of Appendix III of Section XI,1974 edition through winter 1975 is acceptable, hcwever, the recording of indications should be as folicws:

Record all indications which produce a response of 50% or greater of primary reference level.

Evaluate all indications producing a response of 100% or greater of primary reference level.

2.

Use of technical specifications for examination of hydraulic snubbers is acceptable if technical specification procedures meat or exceed code requi remen ts.

Please provide documentation that si a s the extent of technical specification examination requirements.

PAGE I-3 Class 1 Comoonents 1.

Can nozzle to vessel welds N-2, N-4 and N-6 be examined using surface methods ?

PAGE I-10 1.

Concerning your request for relief from examination of vessel cladding, will examination of the closure head welds also provide meaningful information about the condition of the cladding?

2.

In Note 10, you state that safety infection valve bonnet belting has spherical ends, thus precluding volumetric examination.

Since the probable point of crack initiation and growth is the thread root area, has an ultrasonic examination technique utilizing response from thread roots been considered? If this alternate volumetric examination is not possible, is a surface examination of these bolts possible?

Class 2 Comconents 1.

Examination of hydraulic snubbers to requirements of technical specifica-tions is acceptable only if technical specificaticns meet or exceed code requi remen ts.

Please ccmcare and state the differences.

2.

Note 2, Page II-5, states that volumetric examination of the shu ccwn heat excnangers is precluced due to weld design.

please provice details of che nozzle-00-vessel welcs tna; explain wny go volumetric examina icn can be done.

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