ML20204A255

Forwards Request for Addl Info Re 851226 Response to Integrated Design Insp Finding 2-20, Evaluation of Jet Impingement Effects

ML20204A255
Person / Time
Site:	Seabrook
Issue date:	04/08/1986
From:	Nerses V Office of Nuclear Reactor Regulation
To:	Harrison R PUBLIC SERVICE CO. OF NEW HAMPSHIRE
References
NUDOCS 8605090533
Download: ML20204A255 (4)

Text

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APR 8 W Docket Nos.: 50-443 DISTRIBUTION and 50-444 Wocket File NRC PDR LPDR PD5 Reading RBallard Mr. Robert J. Harrison MRushbrook JBrammer President & Chief Executive Officer VNerses Attorney, ELD Public Service Company of New Hampshire BGrimes ACRS (10)

Post Office Box 330 JPartlow Manchester, New Hampshire 03105 Edordan VNoonan

Dear Mr. Harrison:

ERossi

Subject:

Integrated Design Inspection (IDI) FINDING #2-20, " EVALUATION OF JET IMPINGEMENT EFFECTS" - SEABROOK STATION i

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References:

1.

Letter from G. Knighton to R. Harrison, " Resolution c/ Seabrook Integrated Design Inspection Issues",

dated June 11, 1985.

i 2.

Letter from J. DeVincentis to V. Noonan, " Response to Integrated Design Inspections", dated December 26, 1985, i

The response to the staff's request for additional information (Reference 1) relative to IDI Finding #2-20, " Evaluation of Jet Impingement Effects", was submitted by DeVincentis in Reference 2.

We have reviewed this response and have concluded that it does not address all of the staff's original questions which were in Reference 1.

Complete responses to the enclosed request for i

additional information will be required before the staff can conclude their evaluation of this issue.

Questions or additional information regarding this matter should be directed to me at (301) 492-8535.

Sincerely, i

Victor Nerses, Project Manager PWR Project Directorate No. 5 Division of PWR Licensing-A

Enclosure:

As stated cc: See next page f

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V ses/yt 4/ /86 8605090533 86040BR DR ADOCK 0500 l

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1 Mr. Robert J. Harrison Public Service Company of New Hampshire Seabrook Nuclear Power Station cc:

Thomas Dignan, Esq.

E. Tupper Kinder, Esq.

John A. Ritscher, Esq.

G. Dana Bisbee, Esq.

Ropes and Gray 225 Franklin Street Assistanc Attorney General Office of Attorney General Boston, Massachusetts 02110 208 State Hosue Annex Concord, New Hampshire 03301 Mr. Bruce B. Beckley, Project Manager Public Service Company of New Hampshire 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 William S. Jordan, III 30 South 17th Street Diane Curran Post Office Box 8223 Harmon, Weiss & Jordan Philadelphia, Pennsylvania 19101 20001 S Street, NW Suite 430 Washington, D.C.

20009 Mr. Philip Ahrens, Esq.

Assistant Attorney General State House, Station #6 Augusta, Maine 04333 Jo Ann Shotwell, Esq.

Office of the Assistant Attorney General Environmental Protection Division Mr. Warren Hall One Ashburton Place Public Service Company of Boston, Massachusetts 02108 New Hampshire Post Office Box 330 D. Pierre G. Cameron, Jr., Esq.

Seabrook, New Hampshire 03874 General Counsel Public Service Company of New Hampshire Seacoast Anti-Pollution League Post Office Box 330 Ms. Jane Doughty Manchester, New Hampshire 03105 5 Market Street Portsmouth, New Hampshire 03801 Regional Administrator, Regicn I U.S. Nuclear Regulatory Commission Mr. Diana P. Randall 631 Park Avenue 70 Collins Street King of Prussia, Pennsylvania 19406 Seabrook, New Hampshire 03874 Richard Hampe, Esq.

New Hampshire Civil Defense Agency 107 Pleasant Street Concord, New Hampshire 03301

4 I

Public Service Company of Seabrook Nuclear Power Station New Hampshire cc:

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 ATTN: Tom Burack RFD Dalton Road U.S. Senate i

Brentwood, New Hampshire 03833 Washington, D.C.

20510 Ms. Roberta C. Pevear Mr. Owen B. Durgin, Chairman Town of Hampton Falls, New Hampshire Durham Board of Selectmen Drinkwater Road Town of Durham Hampton Falls, New Hampshire 03844 Durham, New Hampshire 03824 Ms. Sandra Gavutis Charles Cross, Esq.

Town of Kensington, New Hampshire Shaines, Mardrigan and RDF 1 McEaschern East Kingston, New Hampshire 03827 25 Maplewood Avenue Post Office Box 366 Chairman, Board of Selectmen Portsmouth, New Hampshire 03801 RFD 2 South Hampton, New Hampshire 03827 Mr. Guy Chichester, Chaiman Rye Nuclear Intervention

~

Mr. Angie Machiros, Chairman Committee Board of Selectmen c/o Rye Town Hall for the Town of Newbury 10 Central Road Newbury, Massachusetts 01950 Rye, New Hampshire 03870 Ms. Cashman, Chairman Jane Spector Board of Selectmen Federal Energy Regulatory Town of Amesbury Commission Town Hall 825 North Capital Street, NE Amesbury, Massachusetts 01913 Room 8105 Washington, D. C.

20426 Honorable Peter J. Matthews Mayor, City of Newburyport Mr. R. Sweeney Office of the Mayor New Hampshire Yankee Division City Hall Public Service of New Hampshire Newburyport, Massachusetts 01950 Company 7910 Woodmont Avenue Mr. Donald E. Chick, Town Manager Bethesda, Maryland 20814 Town of Exeter 10 Front Street Mr. William B. Derrickson Exeter, New Hampshire 03823 Senior Vice President Public Service Company of New Hampshire Post Office Box 700, Route 1 Seabrook, New Hampshire 03874 i

l en I

ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION SEABROOK STATION, UNITS 1 & 2 DOCKET NOS. 50-443 AND 50-444 ENGINEERING BRANCH, PWR-A The applicant's response to the staff request for additional information relative to Integrated Design Inspection Finding 2-20. " Evaluation of Jet Impingement Effects" was submitted in Attachment 3 to a letter from J. DeVincentis to V. Noonan dated December 26, 1985. Questions No. I and 2 in the staff request were not addressed in the response and the responses to Questions No. 3 and 4 require clarification. To resolve this issue, the staff requests the following additional information:

1.

Provide an explicit statement that the two example analyses submitted in the response are bounding calculations and therefore safe shutdown of the Seabrook Station can be accomplished when the jet impingement loads in question are included in the evaluation of all safety-related-target piping systems.

2.

The two example analyses assumed for conservatism that the jet source was considered to originate two pipe diameters from the target. However, because of the closeness of the source to the target, the full fluid force is not achieved until after the fluid has already reached the target pipe. Therefore, the dynamic load factor of 2.0 was applied to a force equal to 1/2 Fimp.

Based on the information submitted in the iSove letter, the staff does not agree that the assumption of two pipe diameters is conservative. Although the break opening time of one millisecond is longer than the time required to reach the target, it appears that an impingement force larger than 1/2 Fimp could be developed.

Provide a discussion of how the relationship between break opening time and-the distance to the target results in 1/2 Fimp.

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