ML20073P599
| ML20073P599 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 04/18/1983 |
| From: | Sarsten G UNITED ENGINEERS & CONSTRUCTORS, INC. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| REF-PT21-83 NUDOCS 8304250295 | |
| Download: ML20073P599 (3) | |
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DENVER 30 South 17th Street EcsEtoN Post Office Box 8223 KNOxytLLE Philadelphia, PA 19101
['t,y [o%^g April 18, 1983 Director Office of Inspection and Enforcement
- d. S. Nuclear Regulatory Commission Washington, DC 20555
Dear Sir:
Subject:
10CFR21 Report of a Defect Related to Public Service Company of New Hampshire - Seabrook Station - Units 1 & 2 This is to inform you of a defect which has come to my atten-tion related to the adequacy of the Service Water and Circulating Water Pump House structure for the Seabrook station. While this defect will be reported by the Public Service Company of New Hampshire in accordance with 10CFR50.55(e), we are providing this 10CFR21 report to assure that the Commission has been adequately informed.
Details of our report are attached.
Very truly yours,
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[G.E.
arsten Vig President - Power h
Attachment copy: Regional Director USNRC - Region 1 8304250295 83041s DR ADOCK 05000443 PDR TELEPHONE 215 422 3000 TWX 710-670-1267 TELEX 83-4203 TELECOPIER 215 422-3049 f A Raytheon Coenpany
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NAME AND ADDRESS OF THE INDIVIDUAL OR INDIVIDUALS INFORMING THE COMMISSION.
G. E. Sarsten, Vice President - Power United Engineers & Constructors Inc.
30 South 17th Street Philadelphia,lPa. 19101
-IDFNTIFICATION OF THE FACILITY, THE ACTIVITY, OR THE BASIC COMPONENT SUPPLIED FOR
- SUCH FACILITY OR SUCH ACTIVITY WITHIN THE UNITED STATES WHICH FAILS TO COMPLY OR CONTAINS A DEFECT.
Public Service Company of New Hampshire, Seabrook Station. Design of the Service Water and Circulating Water Pump House station.
IDENTIFICATION OF THE FIRM CONSTRUCTING THE FACILITY OR SUPPLYING THE BASIC COM-PONENT WHICH FAILS TO COMPLY OR CONTAINS A DEFECT.
United Engineers & Constructors Inc.
NATURE OF THE DEFECT OR FAILURE TO COMPLY AND THE SAFETY HAZARD WHICH IS CREATED OR COULD BE CREATED BY SUCH DEFECT OR FAILURE TO COMPLY.
A' " defect" exists _in the structural design of the concrete wans sepa-rating pump cens in the Category I Service Water and Circulating Water Pump House. This " defect" is due to the fact that these concrete walls were not designed to withstand forces associated with differences in water levels in adjacent cens when one of these cells is dewatered for maintenance (access to the travelling screens and pumps).
The forces associated with differences in water levels of adjacent cells when one cell is dewatered for maintenance would cause over-stress.in the lower portions of the concrete wens. This overstress will exist-whenever the differential water _ pressure head surpasses-
'35 feet. During a surge caused by the trip of the circulating water pump, the differential water pressure head can reach 61' feet. The
.overstress caused by such pressure could cause the lower parts of the concrete walls (below elevation -12') to experience extensive cracking with the possibility of some spaning on both sides of these walls.
THE DATE ON WHICH THE INFORMATION OF SUCH DEFECT OR FAILURE TO COMPLY WAS OBTAINED.
April 18, 1983 9
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,...C' IN THE. CASE OF A BASIC COMPONENT WHICH CONTAINS A DEFECT OR FAILS TO COMPLY, THE
. NUMBER AND LOCATION OF ALL SUCH COMPONENTS IN USE AT, SUPPLIED FOR, OR BEING SUPPLIED FOR ONE OR MORE FACILITIES OR ACTIVITIES SUBJECT TO THE REGULATIONS IN THIS PART.
.This defect applies only to the Seabrook Station, Units 1 and 2.
THE CORRECTIVE ACTION WHICH HAS BEEN, IS BEING, OR WILL BE TAKEN: THE NAME 0F
- THE INDIVIDUAL OR ORGANIZATION RESPONSIBLE FOR THE ACTION: AND THE LENGTH OF TIME THAT HAS BEEN OR WILL BE TAKEN TO CCMPLETE THE ACTION.
Modifications to the structure as required to strengthen the concrete walls will be~made. United Engineers & Constructors Inc. will be responsible for these modifications. The design of the modifications will be completed by June 17, 1983.
9 ANY ADVICE RELATED TO THE DEFECT OR FAILURE TO COMPLY ABOUT THE FACILITY,.
ACTIVITY, OR BASIC COMPONENT THAT HAS BEEN, IS BEING, OR WILL BE GIVEN TO PURCHASERS OR LICENSEES.
Public Service Company of New Hampshire will be advised to report the defect under the provisions of 10CFR50.55(e).
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