ML20127L163

Advises That United Engineers & Constructors Interpretation of Pipe Whip Criterion Not Applicable to Jet Impingement Effects.Encl Addl Info Required to Resolve Finding 2-20 of Plant Integrated Design Insp Issues

ML20127L163
Person / Time
Site:	Seabrook
Issue date:	06/11/1985
From:	Knighton G Office of Nuclear Reactor Regulation
To:	Harrison R PUBLIC SERVICE CO. OF NEW HAMPSHIRE
References
NUDOCS 8506270770
Download: ML20127L163 (5)

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JUN 111985 Docket Nos.: 50-443 and 50-444 Mr.' Robert'J. Harrison President & Chief Executive Officer Public Service Company of New Hampshire Post Office Box 330 Manchester, New Hampshire 03105

SUBJECT:

RESOLUTION OF SEABROOK INTEGRATED DESIGN INSPECTION (IDI) ISSUES We have been reonested to assist the Office of Inspection and Enforcement in resolving Finding 2-20 to the Seabrook IDI issues.

We have reviewed Finding 2-20 which concerns the screening criterion used by UEC to evaluate jet inpingement effects on target piping and supports. We find that the UEC interpretation of the pipe whip criterion is not applicable to ,iet impingenent effects and requires additional inforrretien (Enclosure) to adequately resolve this issue.

Questions or additional information regarding this matter should be directed to the Seabrook Project Manager, Mr. V. Herses (301492-7238).

Sincerely,

/ s-/

Coorge W. Knighton, Chief Licensing Branch No. 3 Division of Licensing

Enclosure:

As stated cc: See next page DISTRIBUTION

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Seabrook

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Mr. Robert J. Harrison -

l President and Chief Executive Officer )

Public Service Company of New Hampshire Post Office Box 330 Manchester, New Hampshire - 03105 Thomas Dignan,.Esq. E. Tupper Kinder, Esq.

John A.,Ritsche.r,_Esq. G. Dana Bisbee, Esq.

. Ropes and Gray Assistant Attorney General 225 Franklin Street Office of Attorney General

' Boston, Massachusetts 02110 208 State Hosue Annex Concord, New Hampshire 03301 Mr. Bruce B.. B.e'ckley, Project Manager Public Service Company of New Pampshire Resident Inspector Post Office Box 330 Seabrook Nuclear Power Station Manchester, New Hampshire 03105 c/o US Nuclear Regulatory Commission Post Office Box 700 Dr. Mauray Tye,. President Seabrook, New Hampshire 03874 Sun Valley Association 209 Summer Street Mr. John DeVincentis, Director Haverhill, Massachusetts 01839 Engineering and Licensing Yankee Atomic Electric Company Robert A. Backus, Esq. 1671 Worchester Road O'Neil, Backus and Spielman Framingham, Massachusetts 01701 116 Lowell Street Manchester, New Hampshire 03105 Mr. A. M. Ebner, Project Manager United Engineers'& Constructors Ms. Beverly A. Hollingworth 30 South 17th Street 7 A Street Post Office Box 8223 Hampton Beach, New Hampshire 03842 Philadelphia, Pennsylvania 19101 William S. Jordan, III Mr. Philip Ahrens, Esq.

Diane Curran Assistant Attorney General Harmon, Weiss &' Jordan State House, Station #6 20001 S Street, NW Augusta, Maine 04333 Suite 430 Washington, DC 20009 Mr. Warren Hall do Ann Shotwell., Esq. Public Service Company of Office of the Assistant Attorney General New Hampshire Environmental Protection' Division Post Office Box 330 One Ashburton Place Manchester, New Hampshire 03105 Boston, Massachusetts 02108 Seactast Anti-Pollution League D. Pierre G. Cameron, Jr. , Esq. Ms. Jane Doughty General Counsel 5 Market Street Public Service Company of New Hampshire Portsmouth, New Hampshire. 03801 Post Office Box 330 Manchester, New Hampshire 03105 Mr. Diana P. Randall 70 Collins Street Regional Administrator - Region I Seabrook, New Hampshire 03874 U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406 r.-._. . _ _ _ . _ . . ~ _ _ _ _ - . . _ . . . _ . . - _ .~ -- - - . . - . - - -

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Mr. Calvin A. Canney, City . Manager - Mr. Alfred V. Sargent, City Hall Chairman' 126 Daniel Street Board of Selectmen Portsmouth, New Hampshire 03801 , Town of Salisbury, MA 01950 ,

Ms. Letty Hett Senator Gordon J. Humphrey Town of Brentwood . U. S. Senate

., RFD Dalton Road . Washington, DC 20510

,Brentwood, New Hampshire 03833 (Attn: Tom Burack) -

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Ms. Roberta C. Pevear Senator Gordan J. Humphrey Town of Hampton Falls, New Hampshire 1 Pillsbury Street

. Drinkwater Road Concord, New Hampshire 03301 Hampton Falls, New Hampshire 03844 (Attn: HerbBoynton)

Ms. Sandra Gavutis Mr. Owen B. Durgin, Chaiman Town of Kensington, New Hampshire Durham Board of Selectmen RDF 1 Town of Durham East Kingston, New Hampshire 03827 Durham,'New Hampshire 03824 Charles Crcss, Esq.

_ Chairman, Board of Selectmen Shaines, Hardrigan and Town Hall McEaschern South Hampton, New. Hampshire 03827 25 Maplewood Avenue Post Office Box 366 Mr. Angie Machiros, Chairman Portsmouth, NH 03801 Board of Selectmen for the Town of Newbury Newbury, Massachusetts 01950 Mr. Guy Chichester, Chaiman

. Rye Nuclear Intervention Ms. Rosemary Cashman, Chairman Committee Board of Selectmen- c/o Rye Town Hall Town of Amesbury 10 Central Road Town Hall Rye, New Hampshire 03870 Amesbury, Massachusetts 01913 Jane Spector

~ Honorable Richard E. Sullivan Federal Energy Regulatory Mayor, City of Newburyport Commission

-Office of the Mayor 825 North Capital Street, NE City Hall Room 8105 Newburyport, Massachusetts 01950 Washington, D. C. 20426 Mr. Donald E. Chick, Town Manager Mr. R. Sweeney Town of Exeter New Hampshire Yankee Division 19 Front Street Public Service of New Hampshire Exeter, New Hampshire 03823 Company 7910 Woodmont Avenue-Mr. William B. Derrickson Bethesda, Maryland 20814 Senior'Vice President

. Public Service Company of New Hampshire Post Office Box 700, Route 1 Seabrook,'New Hampshire 03874

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ENCLOSURE Finding 2-20, Basis for Analysis In conjunction with the Integrated Design Inspection (IDI) conducted for the Seabrook facility, a follow-up inspection at United Engineers & Constructors

- (UE&C) identified an open item regarding the screening criterion used to

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evaluate jet impingement effects on target piping and supports. -

Branch Technical Position ASB 3-1, Appendix B states, "the energy level in a whipping pipe may be considered as insufficient to rupture an impacted pipe' of equal or greater nominal pipe size and equal or heavier wall thickness." UE&C considers the loads induced in. larger size target piping and supports by jet

- impingement effects to be less severe than the loads induced by a whi.pping pipe and,.thus provide a greater margin against failure. The following is the staf.f's position on the use of the above screening criterion for jet impingement effects.

The SRP NUREG-0800 Section 3.6.1 Branch Technical Position ASB 3-1, paragraph 1.(d) (footnote 1) and Section 3.6.2, paragraph III.2 state that the energy level associated with an unrestrained whipping pipe is considered capable of causing breaks in impacted pipes of smaller nominal pipe size and developing through-wall leakage cracks in impacted piping of equal or. larger nomincl pipe size with thinner wall thickness. Because of the fundamental difference between the nature of the loadings caused by an unrestrained whipping pipe (dynamic impact) and a jet flow from a restrained pipe break or crack (static pressure), the staff has not permitted the above guidelines for whipping pipes to _be extended t'o jet impingement even though the equivalent static load .from a jet is generally less than that from a whipping pipe. The staff further recognizes, for high impact velocities associated with a whipping pipe, the strain rate effects can significantly increase the yield strength in the impacted pipe.

As a result, the staff does not find the use of the screening criterion to be i acceptable for jet impingement effects. The staff requests that the applicant l provide the following information for resolution of this item.

1) Identify the piping and supports in the Seabrook facility which are affected by this item. Include system description and plant location.

2) Demoristrate that safe shutdown of the Seabrook facility can be accomplished when the jet impingement loads are included in the evaluation of target piping systems.

3) Address the significance of including jet impingement loadings in the faulted load combination with respect to the ability of the target piping and supports to withstand the effects of the jet impingemert load in combination with an SSE.

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. 4) The jet impingement loading on the target pipe may be calculated using

'the methodology presented in ANSI /ANS-58 2 (1980) " Design Basis for Protection of Light Water Nuclear Power Plants Against Effects of Postulated Pipe Rupture" in addition to the guidelines in SRP Section 3.6.2, paragraph 111.3.

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