ML19262B464
| ML19262B464 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 12/07/1979 |
| From: | Lundvall A BALTIMORE GAS & ELECTRIC CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-79-02, IEB-79-2, NUDOCS 7912280010 | |
| Download: ML19262B464 (2) | |
Text
e 4
M c-BALTIM ORE GAS AN D ELECTRIC CO M PANY GAS AND ELECTRIC BUILDING BALTIMORE, MARYLAN D 21203 ARTMum E. LUN DVALL,dR.
December 7, 1979 ViCE PRE S60ENT Sumv Mr. Boyce H. Grier, Director Region I, Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission 631 Park Avenus King of Prussia, Pennsylvania 19406
Subject:
Calvert Cliffs Nuclear Power Plant Units Nos. I and 2 Docket Nos. 50-317 and 50-318 IE Bulletin No. 79-02, Revision 2 Concrete Expansion Anchor Bolts
Dear Mr. Crier:
In accordance with your letter dated November 8, 1979, subject as above, the following is subettted in response to your request for additional information and is in addition to our earlier response dated July 6, 1979.
Action Item 5 Determine the extent that expansion anchor bolts were used in con-crete block (masonry) walls to attaci. piping supports in Seismic Category 1 systems (or safety related systems as defined by Revision 1 of IE Bulletin No. 79-02).
Response
All Seismic Category I large piping systems for Units 1 and 2 have been inspected by field "walkdowns".
No such supports have been identified attached to concrete block walls in any of the Seismic Category 1 or safety related systems.
Action Item 6 Determine the extent that pipe supports with expansion anchor bolts used structural steel shapes instead of base plates.
Response
A limited number of pipe supports (36 - Unit 1, 16 - Unit 2) were found to have been installed using structural shapes attached directly to concrete with expansion anchors. These supports have been reviewed and repaired as necessary to be consistent with the criteria of IE Bulletin 79-02, Revision 1.
} f)k 9122So(C>li ()
'd Mr. Boyce H. Grier December 7, 1979 Action Item 7 Provide a schedule that details the completion dates for IE Bulletin No. 79-02, Revision 2, Items 1, 2, and 4.
Response
(a) As of this date, all base plate flexibility calculations have been com-pleted for Units 1 and 2.
(b) All Seismic Category I large pipe supports (greater than 2" diameter) have been inspected as to compliance with original design.
(c) All concrete expansion anchor bolts for Seismic Category 1 large pipe supports have been tested by application of an appropriate test load.
(d) All Unit 2 supports for Seismic Category 1 small pipe have been inspected as to compliance with original design. Inaccessible supports on Unit I will be checked during the next extended outage.
(e) All Seismic Category I large pipe supports with a factor of safety less than 2.0 have been repaired. Those supports with a factor of safety less than the required factors of safety of 4.0 for wedge type and 5.0 for shell type but greater than 2.0 have been identified and will be repaired.
As of this date, there are 30 supports in this category, 26 of which are accessible and will be repaired by March 1, 1980. Those four supports which are-inaccessible (all in Unit 1) will be repaired during the next extended outagt an Unit I now scheduled to begin in September, 1980.
Very truly yours,
/
d)]td A. E. Lundvall, Jr.
cc:
J. A. Biddison, Esquire G. F. Trowbridge, Esquire Messrs. E. L. Conner, Jr. - NRC J. W. Brothers - Bechtel Office of Inspection & Enforcement U.S. Nuclear Regulatory Commission Division of Reactor Construction Inspection Washington, D.C.
20555 1648 045