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ACCESSION NBR:8511070070 . DOC ~ DATE: 85/11/01 NOTARIZED: NO, DOCKET~ FACIL:50-410 Nine Mile Point Nuclear Stations Unit 2E N1agara Moha 05000410

AUTH,NAME AUTHOR AFFILIATIONMANGANEC,Y. Niagara Mohawk Power Corp,

RECIP ~ NAME RECIPIENT AFFILIATIONBUTLERE|4 ~ Licensing Branch 2

SUBJECT: Forwards responses to Seismic Reyiew Team auditRemaining responses will be provided by 860101

'ISTRISUTIONCODE: AOASD COPIES RECEIVED:LTR.J ENCLTITLE: OR/Licensing Submittal; Equipment Qualification

NOTES;

openitems'IZE:

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RECIPIENTID CODE/NAME<

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NIAGARAMOHAWKPOWER CORPORATION/300 ERIE BOULEVARDWEST, SYRACUSE, N.Y. 13202/TELEPHONE (315) 474-1511

November 1, 1985(NMP2L 0525)

Dr. Walter Butler, ChiefLicensing Branch No. 2U.S. Nuclear Regulatory CommissionWashington, D.C. 20555

Dear Dr. Butler:

Re: Nine Mile Point Unit 2Docket No. 50-410

Enclosed for your information are certain responses to the Seismic ReviewTeam Audit open items. The remaining responses will be provided on or beforeJanuary 1, 1986.

Very truly yours,

C. V. ManganSenior Vice President

NLR/rlaEnclosures1009G

xc: R. A. Gramm, NRC Resident InspectorProject File (2)

85k f070070 85'0 fPDR aDOCK 050004f0A

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0NRC Audit Item P-A-27:

In addition to 2 RHS * RVV 36A, are there any other safety related pumpsand valves that have been qualified by analysis

only'esolution/Response:

Yes, all active pumps and check valves are qualified for seismic load byanalysis. Also all non-active valves are qualified for seismic load byanalysis.

T

NRC Audit Item S-B-17:

Is contact chatter acceptable . . . need confirmation, assurance that thisdoes not present a problem.

Attached Foxboro (}ualification Report for Ref. 90AAB60/34, Part l.

Resolution/Response:

The enclosed Foxboro letter dated September 18, 1985, for a response to0uestion.

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The Foxboro Company

38 Neponset AvenueFoxboio, MA02035Tdephone 61 7-5i34750Telex 927402

Setpember 18, 1985

Stone 8 Webster Engineering Corp,3 Executive CampusP. 0. Box 5200Cherry Hill, NJ 08035

Attention: Mre Bim Sinha

Reference: NMp-C072L/ce7IL77N-612 77

Subject: Seismic equal ification

Gent 1 emen:

During our telecon of 9/12/85 Mr. Sinha expressed concern aboutqualification of contact output isolator 2AO-L2C-R.

is<As documented in test report gOAAB60I page 1, the outputs of outputisolator 2AO-L2C-R had contacts which chattered during SSE tests,but none of the outputs chattered during the OBE tests.

However, Foxboro gener ic OBE test was performed 5 times in each of thefour horizontal directions. Since the Foxboro generic OBE test exceedsthe Nine t/ile Point Unit 2 SSE response spectra, we feel that in ourbest judgement five Foxboro generic OBE's are more severe than 5 NMP2OBE's and one NMP2 SSE. Therefore, we consider this device qualifiedfor use on the NMP2 project.

We trust this information meets your approval.

Very truly yours,

THE FOXBORO COMPANY

$ ,(~Un~Aldo VianelloPower Systems Engineering

~ I

NRC Audit Item S-C-8:

What is the source of Structural Division Calculation 12177-C58-TAB23,which references Appendix XVII, Par. XVII-2461.3.

'eed

copies of the referenced section of the Calculation 12177-C58, ASMESection III, Subsection NA, and Appendix X.

Resolution/Response:

With regard to the battery rack support detail calculations, No.12177-C58-TAB23, the question of source and applicability of the equationfor anchor bolt stress acceptability as shown on Page 40 is clarifiedbelow.

The title of calculation no. 12177-C58-TAB23 is "Design of Sill Detailsfor Miscellaneous Equipments - Control Building". As can be seen on Page2 (table of contents), this calculation consists of two parts:

1) Design of mounting details for battery racks.

2) Anchor bolt design for chilled H20 expansion tank.

Page No. 40 is actually from calculation number 12177-MS-1277 titled"Support Design for Chilled H20 Expansion Tank" and is labeled asattachment "B" to calculation number 12177-C58-TAB23. -;The questionedequation therefore applies to the calculation for the chilled H20expansion tank rather than the battery racks. (The questioned equation isfrom Ref P3 of calculation number 12177-MS-1277 which is the ASME III 1977code).

Calculation 12177-C58-TAB23 has been revised to reflect the correctreference used in the calculation of anchor bolt stress.

0 ~~

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NRC Audit Item S-K'-6:

Relative to the service water motor hold down bolts, what is itsengagement length*, size (dia.), and is there a washer? What type ofwasher is used? Does the bolt go through the shim?

Resolution/Response:

The motor hold down bolts for the service water pumps were found to have alength of engagement of approximately three tenths of an inch (0.274").This dimension is based on the maximum composite thickness of thelockwasher, motor foot, and shim which the bolt goes through.

Discussions with the pump manufacturer (Gould) have concluded that thislength of engagement is inadequate and will promote joint thread failurewhen subjected to the recommended prestressing levels and design basisloads. An Engineering 5 Design Coordination Report (No. 160671) and10CFR50.55(e) evaluation have been initiated as a result of this condition.

The manufacturer's recommended solution is to replace the existing 2"bolts with 2 1/2" bolts. The additional 1/2" engagement will ensure thatthe failure mode of the joint will be bolt tension and not thread shear.Since the pump assembly seismic analysis report demonstrates bolt tensionadequacy, the joint will be satisfactory after installation of the longerbolts.

The project will purchase and replace these bolts.

* In the bottom plate.

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