ML20072C564
| ML20072C564 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 06/17/1983 |
| From: | Sarsten G UNITED ENGINEERS & CONSTRUCTORS, INC. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| REF-PT21-83-907-000 PT21-83-907, PT21-83-907-000, SBU:74452, NUDOCS 8306210112 | |
| Download: ML20072C564 (3) | |
Text
i aeM 0N 30 South 17th Street ecsatON Post Office Box 8223 xNoxvitte Philadelphia, PA 19101 mtAostesiA VAttEY FORGE June 17, 1983 SBU: 74452 Ref: Letter to Director, Office of Inspection and Enforcement dated April 18, 1983 from United Engineers
& Constructors Inc.
File: 9.1, DCC Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, DC 20555
Dear Sir:
Subj ect:
10CFR21 Interim Report on a Defect Related to Public Service Company of New Hampshire Seabrook Station - Units 1 and 2 This is to inform you of the corrective action taken for a defect related to the adequacy of the Circulating Water Pump House structure for the Seabrook Station. We are providing this 10CFR21 interim report to assure that the Commission has been adequately informed.
A final report will be issued on August 19, 1983 covering the cor-rective action for the Service Water Pump House defect reported to you in the referenced letter covering both structures.
Details of our report are attached.
,.?
Very truly yours, l
//
444 rsten Vice President - Power Attachment copy: Regional Director USNRC - Region 1 8306210112 830617 PDR ADOCK 05000443 N
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[ a n-e- ]
NAME AND ADDRESS OF Tile INDIVIDUAL OR INDIVIDUALS INFORMING THE COMMISSION.
G.E. Sarsten, Vice President - Power United Engineers & Constructors Inc.
30 South 17th Street Philadelphia, PA 19101 IDENTIFICATION OF THE FACILITY, THE ACTIVITY, OR THE P ASIC 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 COMPONENT WHICH FAILS TO COMPLY OR CONTAINS A DEFECT.
United Engineers & Constructors Inc.
NATURE OF THE DEFECT OF FAILURE TO COMPLY AND THE SAFETY HAZARD NHICH IS CREATED OR COULD BE CREATED BY SUCH DEFECT OR FAILURE TO COMPLY.
A " defect" exists in the structural design of the concrete walls sepa-rating pump cells 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 cells 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 walls.
In the Circulating Water Pump House, 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 to experience extensive cracking with the possibility of some spalling on both sides of these walls.
THE DATE ON WHICH THE INFORMATION OF SUCH DEFECT OF FAILURE TO COMPLY WAS OBTAINED.
April 18, 1983.
T
.o
. 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 CR MORE FACILITIES OR ACTIVITIES SUBJECT TO THE REGULATIONS IN THIS PART.
This defect applies only to the Seabrook Station, Units 1 and 2.
THE CORECTIVE ACTION WHICH HAS BEEN, IS BEING, OR WILL BE TAKEN: THE NAME OF THE INDIVIDUAL OR ORGANIZATION RESPONSIBLE FOR THE ACTION: AND THE LENGTH OF TIME THAT HAS BEEN OR WILL BE TAKEN TO COMPLETE THE ACTION.
The enalysis and design of the required structural modifications for the Circulating Water Pump House have been completed as scheduled.
The analysis and design of the needed structural modifications for the Service Water Pump House is being performed and will be completed by August 19, 1983.
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 willbe advised to report the defect under the provisions of 10CFR50.55(e).