ML20012B490

Forwards Corrected Response Re Allegation by Employees Legal Project Concerning Reactor Coolant Pump Support Leg Anchor Bolts

ML20012B490
Person / Time
Site:	Seabrook
Issue date:	03/08/1990
From:	Feigenbaum T PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NYN-90060, NUDOCS 9003150089
Download: ML20012B490 (4)

Text

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, 8 tieMa&~ Homoshire i M.' H'- ' ' '

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• iident and Senior Vice i

E' Chief Operating Officer ~

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NYN-90060 March 8, 1990 l

United States Nuclear Regulatory Commission l Washington, DC 20555 'l,

' Attention: Document Control Desk

References:

(a) Facility Operating License No. NPF-67. Docket No. 50-443 (b) NHY Letter NYN-90020 dated' January 24, 1990, ' Response to i A11egations' T. C. Feigenbaum to USNRC (c) USNRC Letter dated February 7, 1990, 'NRC Inspection '

-Report $0-443/90-80', W. T. Russell to E. A. Brown ,

Subjectt Reactor Coolant Pump Support Leg Anchor Bolte Gentlemen:

New Hampshire Yankee (NHY) addressed an allegation by the Employees Legal Project (ELP), regarding reactor' coolant pump support bolts in C 'J Reference (b). In Enclosure 3 to that response, the evaluation provided for

-ELP Concern ho.;22'provided an incorrect diameter for the anchor bolt holes.

The<ccrrected response is provided as a replacement.page as Enclosure 1 to this letter. Additional information regarding the use of square plate >

washers for one of the standard washers is also provided in Enclosure 1.

Based-upon preliminary it1 formation providvd by NHY, the NRC _

. addressed the ELP allegation in Reference (c), stating that the reactor l- Lcoolant. pump support leg anchor bolts are 48 inches long and 2 inches in diameter. Subsequent NHY! evaluation and drawing verification has determined that the bolts are 58 inches long and 3 inches in diameter.

Should you have any questions regarding this matter, please contact Mr.'Neal A. Pillsbury, Director of Quality Programs, at (603) 474-9521, extension 3341.

Very truly yours, i

&A W g Ted C. Feigenbaum 9003150089 900309 .hj)

PLR ADOCK 05000443

.o PDC 1.0

• New Hampshire Yankee Division of Public Service Company of New Hampshire P.O. Box 300

• Seabrook, NH 03874

• Telephone (603) 474 9521

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I' United States Nuclear Regulatory Commission March 8, 1990 Attention: Document Control Desk Page two 4

cci Mr. William T. Russell Regional Administrator United States Nuclear Regulatory Commission Region I 475 Allendale Road i King of Prussia, PA 19406 Mr. Victor Nerses, Project Manager Project Directorate I-3 United States Nuclear Regulatory Commission Division of Reactor Projecte Washirgton, DC 20555 Mr. Noel Dudley NRC Senior Resident Inspector -

P.O. Box 1149 Seabrook, NH 03874 s

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4 New Hampshire Yankee March U. 1990 l

Enclosure 1 to NYN-90060 Reactor Coolant Pumr, Support Lee Anchor Bolte s 1

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New Hampshire Yankee March 8, 1990 L

ELP CONCERN #22 CONCERN The movement of the RCP column support legs that was accom-plished earlier and as identified in NRC report 87-07.- How '

l were the legs moved. The embedment bolts.for this' installation E were either welded or bolted to the base plate of the containment building. The bolts are approximately 6 feet long.  ;

The concrete has been poured around the bolts. How was the leg moved and then bolted down with the proper strength bolts?

Were the embedded bolte cut? How were the legs moved 2 inches (per NRC report) or 5 inches (per concerned individual). The strength requirement by the design drawing for the embedded i

bolts is 115kpsi. If the bolts were cut, does the new installation meet this strength requirement? Were Hilti-bolts installed? Do they have the necessary strength to support the i RCP in the event of an earthquake? The pictures provided do not show any offsetting of the bolts from center.

RESPONSE: Support leg was moved in accordance with ECA 08/1557 A..B, and C.

The design of the RC pump column base is shown on-FP 50509. -

The base was engineered to accommodate field installation tolerances, the anchor bolt holes in the 3-inch thick base plate are 2 inches in diameter, 2-inch thick washer plates with 4-inch diameter holes were placed beneath and on top of the base plate around the anchor' bolts. Leveling nuts, load nuts, jam nuts, and standard washers were then installed.' A desian channe (ECA 01/2355D) allowed the use of sauare clate washers for one of the standard washers. Grout was placed beneath the base to complete the installation. The base was moved '

approximately 2 inches utilizing the built-in adjustability of the design ~. The original anchor bolts were utilized. The support carries only tension or compression oversize holes do not affect ability of base to perform its function.

CONCLUSION: .The RCP's support structure modifications did not introduce's condition of potential overstress of existing cold leg piping beyond allowable design code limits.

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