ML19330C299

Provides Addl Guidance Re Program to Resolve Anchorage & Support of safety-related Electrical Equipment Issue. Includes Guidance on Expected Scope of Investigations & Info Which Should Be Documented for Review

ML19330C299
Person / Time
Site:	Yankee Rowe
Issue date:	07/28/1980
From:	Crutchfield D Office of Nuclear Reactor Regulation
To:	Kay J YANKEE ATOMIC ELECTRIC CO.
References
TASK-03-11, TASK-3-11, TASK-RR NUDOCS 8008080200
Download: ML19330C299 (5)

Text

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UNITED STATES o

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NUCLEAR REGULATORY COMMISSION aE WASHINGTON, D. C,20555

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JUL 2 81960 Docket No. 50-29 Mr. James A. Kay Senior Engineer-Licensing Yankee Atomic Electric Cogany 25 Research Drive Westborough, Massachusetts 01581

SUBJECT:

ANCH0 RAGE AND SUPPORT OF SAFETY RELATED ELECTRICAL EQUIPMENT

References:

1.

Letter from D. Eisenhut to SEP Licensees, dated January 1,1980 2.

Letter from R. Schaffstall to D. Crutchfield, dated July 3, 1980 Reference 1 identified a potential safety concern relative to the anchorage and support of safety related electrical equipment and requested that you initiate a program to resolve this issue including the installation of any required modifications by September 1,1980. Reference 2 describes a program which was developed by the Systematic Evaluation Program Owners Group in i

response to,coments mtde by members of the NRC staff at a May 14, 1980 meeting in Bethesda. As a result of your coments and our review of Reference 2, we are providing additional guidance to you as indicated in the' Attachments. provides guidance as to the expected scope of your investigations and information which should be documented for our review. A suggested format for this documentation is provided in Attachment 2.

Due to the lack of clarification relative to certain requirements of Reference 1 and in particular the issue of support of internally attached electrical cogonents, we will permit an extension until December 31, 1980 for completion of this program.

This shall-include the installation of any modifications which may be required as a result of your investigations. Any modifications shall be made in accordance with 10 CFR 50.59 of the Comission Regulations. We-request that formal documentation summarizing your program be submitted l

.to this office by December 31, 1980.

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Existing plant floor response spectra or floor response spectra computed l

or estimated from the NRC Site Specific Spectra Program are acceptable l

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i Mr. J ames ' A. Kay JUL 2 81980 for use in your evaluation. The conservatism of these loadings shall be verified when the final floor response spectra are available.

Sincerely, 1

. () &d-Ms Dennis M. Crutchfield, Chief

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Operating Reactors Branch 15

[1 Division of Licensing Attachments As stated cc w/ attachments:

See next page

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Mr. James A. Kay f

cc Mr. James E. Tribble, President

-l Yankee Atomic Electric Company l

25 Research Drive Westborough, Massachusetts 01581 Greerifield Comunity College 1 College Drive Greenfield, Massachusetts 01301 l

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Board of Selectmen Town of Rowe Rowe, Massachusetts 01367 Energy Facilities Siting Council 14th Floor l.

One Ashburton Place Boston, Massachusetts 02108 Director, Technical Assessment Division Office of Radiation Programs (AW-459)

U. S. Environmental Protection Agency Crystal Mall #2 Arlington, Virginia 20460 U. S. Environmental Protection Agency l

Region I Office ATTN: EIS C0ORDINATOR JFK Federal Building Boston, Massachusetts 02203

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, ATTACHMENT 1 ANCHORAGE AND SUPPORT OF SAFETY RELATED ELECTRICAL EQUIPMENT POINTS TO BE ADDRESSED BY SEP LICENSEES IN DECEMBER 31, 1980 z

SUBMITTAL 1.

Information should be provided not only for the anchorage of electrical requipment but also the entire support that provides a load oath (such as bracing and frames), as well as support for internally attached components.

The latter is especially important for cabinet or panel type electrical equipment (such as control panels, instrument panels, etc.) which has internally supported components.

An example of a potential improperly supported internal component would be a heavy component cantilevered off a front sheet metal panel without additional support to a stronger and

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stiffer location.

These inadequate supports for internal components also should be identified and corrected before December 31, 1980.

2.

In order towrify that an anchorage or a support of safety related electrical equipment has adequate capacity, provide justification by test, or analytical means.

If expansion anchor bolts exist, justift-cation provided previously for IE Bulletin 79-02 can be utilized if applicable.

The acceptance criteria for substantiating these judgements should be provided, this may involve specifying the factor of safety and allowable stress limits used for design and justifying the overturning moment and shear force used.

3.

Provide a table listing all (to include both floor and wall mounted) safety related electrical equipment in the plant.

For e:ch piece of equipment provide the information described in the attached table (attachment 2).

These investigations of each piece of equipment should determine:

a.

Whether positive 'anchort.ge or support exists b.

The type of anchorage j

c. - Whether internally attached components are properly supported d.

Identify non-seismic Category I equipment, the dislodgement of which during an earthquake may be detrimental to safety related equipment and render them inoperable.

Inspection of, the anchorages of such non-seismic Category I equipment should be conducted.

If positive anchorages do not exist, they should be identified and modified before December 31, 1980.

4.

Wherever modifications of anchorages or supports are required, these modifications should be implemented and thoroughly documented.

5.

The seismic design of cable trays may be treated as a separate problem, because of its complexity.

Each licensee or the SEP Owner's Group. should provide a separate action plan for the resolution of this issue within 30 days of receipt of this letter.-

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l ATTACHMENT 2 Sl#9%RY Of INVESTIGATION Of ANCHORAGE AND SUPPORY Of SAFETY REl.ATED ELECTRICAL. EqulPMLNT AND MON-SEISHIC CATEGORY I ITEMS THAT MAY DAMAGE THl3 EQUIPMENT

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I System Internally Attached Components Non-Selsmic Cat ! Items I.D. of j

Equip. Ehlp.

In Which Location Type of Was Anchorage Modtfled TqEi p tur 7)lrBMr$apport that could potentially Document Name ID Installed 81dg. & Elev.

Anchorage

• Since Jan. 1, 1960

& ID Support Evaluated Interac: with thIs couls.

Supporting Name &

Type of Was Support Conclusion

__ ID Support

[ valuated

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1, ' Examples of Type of Anchorages 1.

Bolted to Equipment 2.

Bolted to Concrete Wall g 3.

Bolted to Concrete Slab

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Bolted to Block Wall

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Welded to Estiedded Channel t

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