ML19257A855
| ML19257A855 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 12/11/1979 |
| From: | Ippolito T Office of Nuclear Reactor Regulation |
| To: | Andognini G BOSTON EDISON CO. |
| References | |
| NUDOCS 8001090236 | |
| Download: ML19257A855 (4) | |
Text
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UNITED STATES g
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WASHINGTON, D. C. 20S55
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CECEMBER 111979 Docket No. 50-293 Mr. G. Carl Andognini Boston Edison Company 800 Boylston Street Boston, Massachusetts 02199 We have completed our review of the information on the Pilgrim Station Breakwater you supplied in response to our letter dated July 31,19M It appears that certain key information is lacking that would clarify the adequacy of the breakwater to perform its safety related function.
The enclosure to this letter sets forth the remaining concerns and information needs.
Please submit the information requested in the enclosure within 60 days of your receipt of this letter.
If you have any questions on this request for information, please contact us.
Sincerely,
/
_4 ab'h i omas Ippolito, Chief Operating Reactors Branch #3 Division of Operating Reactors
Enclosure:
Hydrologic Engineering Coments and Questions - Pilgrim Unit No. 1 Breakwater cc w/ enclosure:
see next page 1707 013 80010902 34
IF
.m Mr. G. Carl Andognini Boston Edison Company 2
cc:
Mr. Paul J. McGuire Pilgrim Station Acting Manager Boston Edison Company RFD #1, Rocky Hill Road Plymouth, Massachusetts 02360 Anthony Z. Roisman Natural Resources Defense Council 917 15th Street, N. W.
Washington, D. C.
20005 Henry Herrmann, Esquire Massachusetts Wildlife Federation 151 Tremont Street Boston, Massachusetts 02111 Plymouth Public Library North Street Plymouth, Massachusetts 02360 1707 014
HYDROLOGIC ENGINEERING CU'd.MENTS AND QUESTIONS PILGRIM UNIT 1 BREAXWATER You have not documented that the breakwater experienced design water levels and desigr wave conditions. Based on a review of your responses to our previous questions, the integrity of the breakwater remains questionablo.
In your response to Question (f), you state that a study showed that it was possible to redesign the breakwater to provide adequate, shore protection.
You further state that Mr. R. O. Eaton provided considerable judgment and experience in the redesign.
It is not clear what design bases were used to modify the breakwater configuration.
The model studies showed (p.16) that flatter lee slopes were more stable, yet the breakwater was actually constructed with lee slopes of 1 on 1 practically the steepest slope used in breakwater construction. Additionally, you state (p. 23) that stone placement would be better in the prototype than in the model. In all probability, the exact opposite is true.
It appears that, from your responses to Question (e), the necessary quality control on the armor stone (weight, slope, and placement - interlocking with long axis normal to slope) may have been lacking, Accordingly, provide the following documentation to substantiate the capability of the breakwater to protect safety related facilities, a.
Provide additional information on the wave and water level conditions experienced at the site during the February 1978 and February 1979 storms.
Compare these conditions to those for which the breakwater was designed.
We note that limited information is presented in papers by Fitzgerald and Giese in "The Blizzard of 1979 - Its Effects on the Coastal Environments of Southeastern New England," Boston State College. Portions of this information may be useful in confirming your computed wave data.
If 1707 015
2-
- imation at the plant not available in published reports, site should be obtained from ava"able wave hindcasting mathematical
- mcdelt, b.
Proviue your design bases for changing t..
~1guration of the break-water af_ter the model tests. How did you determine that the redesigned section was as stable as those tested? Describe the engineering judg-ment that went into the reder,ign-How do you justify the use of lee slopes of 1 and Ih, with some portions of c.
the slope even steeper, knowing that the models tests indicated correlation between stabil'.cy and flatness of the slopes.
d.
Discuss how repairs were made to the damaged areas of the breakwater to insure that they are structurally equal or superior to the adjacent undamaged structure. Discuss the quality control used insofar as place-ment and size of the stones are concerned.
1707 016
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