ML20150F183
| ML20150F183 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 03/30/1988 |
| From: | George Thomas PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| IEB-88-001, IEB-88-1, NYN-88038, NUDOCS 8804050055 | |
| Download: ML20150F183 (5) | |
Text
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3 George S. Thomas Vice President Nuclear Production NYN-88038 Put2C Service of New Homg:ehire I
New Hampshire Yankee Division United States Nuclear Regulatory Comnission Washington, DC 20555 Attention:
Document Control Desk Referencer:
(a)
Facility Operating License NPF-56, Docket No. 50-443 (b)
NRC Bulletin 88-01 ' Defects in Westinghouse Circuit Breakers,' dated February 5, 1988 (c)
TACS 65955/65956
Subject:
Response to NRC Bulletin 88-01 Gentlemen:
In response to the request of Reference (b), this letter provides the results of the inspection of Westinghouse-supplied series DS circuit breakers.
I At Seabrook Station Unit 1, four Westinghouse Model No. DS-416 circuit breakers are utilized as reactor trip circuit breakers and reactor trip bypass circuit breakers and one DS-416 circuit breaker is in spare stock.
In
.accordance with NRC Bulletin 88-01, each of these five DS-416 circuit breakers has been inspected.
The inspections performed on each circuit breaker included both the "short term" and 'long term' inspections as defined in the Bulletin.
Thus, for each circuit breaker, a mechanism alignment check was performed, and the welds connecting all seven levers to the pole shaft were
[
visually inspected.
l-The five DS-416 circuit breakers inspected were found to contain pole j
shaft welds that did not meet the acceptance criteria specified in the j
Bulletin and, as a result, require corrective action.
Each unacceptable weld failed to meet either the size or length criteria or boths however, no welds I
contained cracks, porosity, or lack of fusion.
The inspection further determined that the mechanism alignment for each DS-416 circuit breaker was satisfactory.
Therefore, no circuit breakers require corrective action due to mechanism alignments not meeting the acceptance criteria.
A more detailed summary of the circuit breaker inspection results is enclosed in tabular form.
The planned corrective action for each DS-416 circuit breaker is to l
install a replacement pole shaft which meets the acceptance criteria of NRC l
Corrective action will be completed within thirty days of receipt of replacement pole shafts which meet the acceptance criteria.
II 8804050055 G80330 PDR ADOCK 05000443 3 )
O DCn b
P.O. Box 300. Seabrook. NH 03874. Telephone (603) 474 9574
United States Nuclear Regulatory Commission March 30, 1988 Attention:
Document Control Desk Page 2 The optional information requested regarding staff time and costs associated.with activities prompted by NRC Bulletin 88-01 is also enclosed.
The information is approximate and represents manhours expended and costs incurred to date.
Should you have any questions regarding this information, please contact Mr. Geoffrey Kingston at (603) 474-9574, extension 3371.
Very truly yours, i
Georg
. Thomas Enclosure Original to:
Mr. William T. Russell Regional Administrator United States Nucler.r Regulatory Commission Region 1 425 Allendale Road King of Prussia, PA 19406 cc of original to:
Mr. Victor Nerses, Project Manager Project Directorate I-3 Division of Reactor Projects United States Nuclear Regulatory Commission Washington, DC 20555 Mr. A. C. Cerne NRC Senior Resident Inspector Seabrook Station Seabrook, NH 03874 2
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STATE OF NEW HAMPSHIRE Rockingham, ss.
March 30, 1988 Then personally. appeared before me, the above-named George S. Thomas who, being duly sworn, did state that he is Vice President - Nuclear Production of Public Service Company of New Hampshire, that he is duly authorized to execute and file the foregoing information in the name and on the behalf of Public Service Company of New Hampshire, and that the statements therein are true to the best of his knowledge and belief, b
BeverlyE.Silloway,NotarjPitblic My Commission Expires: March 0, 1990
4 ENCLOSURE 1 TO NYN-88038 Summary of DS-416 Circuit Breaker Inspection Results l
DS-416 Circuit Breaker Reference Number l
l 1
I I
I I
l l
Inspection l
1 l
2 l
3 4
l 5
l l
Criteria l
l l
l l
l l
l Pole Shaft Weld l
l Criteria No. 6.1.1 l
F(3) l F(3) l F(3) l F(2) l F(3) l l
(From NSID-TB-87-11) l l
l l
l l
l l
l l
Pole Shaft Weld l
l l
Criteria No. 6.1.2 l
F(l) l F(l) l P
l F(l) l P
l l
(From NSID-TB-87-ll) l l
l l
l l
l l
l Pole Shaft Weld l
l Criteria No. 7.1 l
F(2) l F(2) l F(l) i F(l) l P
l l
(From NSID-TB-87-11) l l
l l
l l
l l
l l
l Breaker Mechanism l
P l
P l
P l
P l
P l
l Alignment Check l
l l
l l
l l
l l
l j
P l
P l
P i
P l
P l
l Porosity Criteria l
l l
l l
l l
I I
I I
I I
NOTES:
'F" denotes that the indicated inspection acceptance criteria was not met.
'P' denotes that the indicated inspection acceptance criteria was met.
The number in parentheses following each F indicates the number of pole shaft welds that failed to meet the acceptance criteria.
ENCLOSURE 2 TO NYN-88038 Licensee Hours And Costs Associated With NRC Bulletin 88-01 1.
Staff time to perform requested inspections, corrective actions, and associated operability testings..............
300 hrs.
2.
Staff time to prepare requested documentations............ 40 hrs.
3.
Additional cost incurred as a result of the inspection findings (e.g., costs of corrective actions, costs of d own t im e ) :................................................ N o n e l
l l
l
.