ML19249A063
| ML19249A063 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 07/20/1979 |
| From: | Moody D YANKEE ATOMIC ELECTRIC CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-79-02, IEB-79-2, WYR-79-85, NUDOCS 7908200004 | |
| Download: ML19249A063 (2) | |
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To tophono 617 366 -90H TwK 7:O-390-07?9 YANKEE ATOMIC ELECTRIC COMPANY B.4.2.1 WYR 79-85
'G NI 20 Turnpoko Road Wostborough, Massachusorts 01581
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July 20, 1979 United States Nuclear Regulatcry Commission Office of Inspection and Enforcement Region I 531 Park Avenue King of Prussia, PA 19406 Attention:
Mr. Boyce H. Grier, Director
References:
(a) License No. DPR-3 (Docket No. 50-29)
(b) Letter NRC to YAEC dated June 21, 1979; I&E Bulletin No. 79-02, Revision 1 (c) Letter YAEC to NRC dated July 11, 1979; (WYR 79-81)
Dear Sie:
Subject:
Additional Information in Response to I&E Bulletin No. 79-02 In accordance with your request, reference (b), and our schedule, reference (c), the following information is being provided in response to I&E Bulletin No. 79-02.
Visual inspections have been completed on hangers and restraints for the following systems:
1.
Emergency Core Cooling System 2.
Vapor Container Long Term Recirculation System 3
Pressurizer Safety and Relief Valve Discharge Line This inspection indicated that in all cases where concrete expansicn anchors are used the anchors appeared to be in good coadition.
No spalling of concrete was observed at the locations of any anchors.
In addition, the anchort were tested for hand tightness and no loose or missing bolting was discovered.
All hangers were found to be in conformance with the information contained on available drawir ss.
The only base plate type supports in the three aforementionad systems utilizing concrete anchors are several restraints for mechanical shock suppressors located on the pressurizer discharge line.
Review of the design criteria for these supports show them to be acceptable for withstanding the loading to which they were designed.
In aduition, the
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United States Nuclear Regulatory Commission Page 2 July 20, 1979 visual inspection revealed no discrepancier wita these supports.
The remainder of the concrete anchors are used in dead-weight hanger applications in which a constant load is applied to the anchor by the weight of the piping it supports.
Failure of this type of hanger would be obvious immediately by its failure to support its static load.
As mentioned, no indicat'.on of any defective anchors of this type was found during the referenced inspections.
In conclusion, due to the limited use of the subject concrete anchors and supports, as well as the high reliability these anchors have provided to date, the problems identified in Bulletin 79-02 are not occurring at the Yankee Rowe facility.
We trust that this information is satisfactory; however, should you desire any additional information please contact us.
Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY a
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