ML19296A822
| ML19296A822 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 01/10/1980 |
| From: | Herbein J METROPOLITAN EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-79-02, IEB-79-2, NUDOCS 8002190084 | |
| Download: ML19296A822 (2) | |
Text
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Metropolitan Edison Company y
f Post Office Box 480 gj
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Middletown, Pennsylvan,a 17057 i
717 944-4041 Writer's Direct Dial Number GQL 1582 January 10, 1980 TLL 009 Mr. B. H. Grier, Director Office of Inspection & Enforcement, Region 1 U. S. !!uclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19h06
Dear Sir:
Three Mile Island Nuclear Station, Unit 1 License No. DPR-50 Docket No. 50-289 I.E.Bulletin 79-02, Rev. 2 This letter is in respcnse to your letter of November 8, 1979, concerning base plates designed to use concrete expansion anchor bolts.
Met-Ed previously responded to Bulletin 79-02, Rev,1 by letter dated July 9, 1979 (GQL 0882). Therefore, this response only covers those new items brought forth in Bulletin 79-02, Rev. 2.
Bulletin Item 2, page 3 of 8, third paragraph
"...provided.
The Bulletin factors of safety were intended for the maximum support load including the SSE."
Restonse:
The governing load combination used is:
Occasional Allo rable Concrete Deadveight + Ther=al + OBE Seismic + Mechanical
- 5. Expansion Anchor Loads Load The aforementioned load combination with SSE substituted for OBE is currently under evaluation using actual field test data for concrete expansion anchor capacity.
The results vill be submitted upon completion of the work.
8002100 dh Metrcccitan Ed: son C ampany is a ?/emoer of +.e Ger. era: Puthe Utit.es System
E. H. Grier, Director GQL 1582 TLL 009 Eulletin Item h, page h of 8, sixth paragraph
" Bolts which are found during the testing program not to be preloaded to a equal to or greater than bolt design load must be properly pre-loaded...
Additional information should be submitted which demonstrates the effects of preload on the anchor bolt ultimate capacity under dynamic loading."
Response
The response to Rev. 1, Item 3.3. stated that shell type anchors are correctly installed by expansion of the shell over a conical plug and thus do not require preload.
Eulletin Item 5, page 5 of 8, first paragraph
" Determine the extent that expansion am hor bolts were used in concrete block (masonry) valls..."
Restonse:
Concrete expansion anchors were not used to fasten Seismic Category I systems to concrete block.
Bulletin Item 6, page 5 of 8, first paragraph
" Determine the extent that pipe supports with expansion anchor bolts used structural steel shapes instead of base plates. The systems and lines reviewed must be consistent with the criteria of I.E.Bulletin 79-02, Rev.1.
Response
The evaluation of pipe supports includes those supports using structural steel shapes (angles, beams, channels) connected with concrete expansion anchors.
This should complete the responses required for the Bulletin 79-02 series.
Sincere 17,
/ J. G Herbein Vice President-Nuclear Operations JGH:DGM:tas