ML17199F790
| ML17199F790 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 05/29/1986 |
| From: | Taylor J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | Reed C COMMONWEALTH EDISON CO. |
| Shared Package | |
| ML17199F791 | List: |
| References | |
| NUDOCS 8606110055 | |
| Download: ML17199F790 (4) | |
See also: IR 05000249/1986009
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UNITED STATES
NUCLEAR REGULATORY COMMISSION
WASHINGTON, D. C. 20555
Docket No. 50-249
Conunonwealth Edison Company
ATTN:
Mr. Cordell Reed
Vice President
Post Office Box 767
Chicago, IL
60690
Gentlemen:
IAY 2 9 1986
SUBJECT:
SAFETY SYSTEM OUTAGE MODIFICATION INSPECTION
(DESIGN) 50-249/86009
'
This letter conveys the results and conclusions of the design portion of the
Safety System Outage Modification Inspection of the Dresden Station, Unit 3
conducted by the NRC's Office of Inspection and Enforcement.
The inspection
team was composed of personnel from the Office of Inspection and Enforcement,
Region*III and consultants. The inspection took place at the Dresden Station,
your offices and the offices of contractors responsible for engineering related
to modifications; it was conducted December 2-6, 16-20, 1985, and January
6-11, 23, 1986. *This inspection was part of a trial NRC program being imple-
mented to examine the adequacy of licensee management and control of modifications
performed during scheduled major plant outages.
The purpose of this portion of the Safety Systems Outage Modification Inspection
was to examine, on a sampling basis, the detailed design and engineering which was
required to support modifications implemented during the outage.
Coordination
was required with teams conducting other portions of the inspection, including
vendor inspections, installation inspection, and the testing inspection.
At the
conclusion of these inspections the NRC will provide a report sununarizing these
efforts.
The items identified by the team during the inspection have been classified as
deficiencies, unresolved items, and observations.
Deficiencies identify errors,
procedural violations and inconsistencies. Unresolved items are identified where
more information is needed to reach conclusions. Observations are identified
where it was considered appropriate to call your attention to matters which are
not deficiencies or unresolved items, but which are recommended for your
consideration.
Section 1 of the report provides a summary of the results of the inspection and
the conclusions reached by the inspection team.
For analog transmitter modifi-
cation packages, one significant deficiency identified that redundant reactor
protection system transmitter trip channels were not separated in the analog
trip system panels.
As a consequence, a single event within a trip system panel
could disable the reactor vessel water leve~ trips of the reactor ~roteqtion and
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primary containment isolation systems.
This and several other design errors
related to analog transmitter modifications indicated design process weaknesses;
six separate organizations were involved in the design process for these modi-
fications, and, in the team's opinion, could have identified the design errors.
found by the team.
For other modifications, the team identified programmatic
weaknesses in the design process with respect to (1) not using the original
- design basis for the plant feature being mod~fied, (2) not assuring that co~rect
and appropriate data is transferred between interfacing organizations, and
(3) unavailability of technical procedures prescribing methodology for develop-
ing important engineering data.
You should respond. in writing to the deficiencies and unresolved items within *
60 days after receipt of this .letter;
In accordance with 10 CFR 2.790(a), a copy of this letter and the enclosure
will be placed in the NRC Public Documen~ Room.
Should you have any questions concerning this inspection, please contact me or
Mr. Ted Ankrum (301-492-4774) of this office.
Sincerely;
.fl'
es M. Taylo , Director
fice of Ins ection and Enforcement
Enclosure:
Inspection Report 50-249/86009
cc w/enclosure:
See .next page
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Commonwealth Edison Company
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Mr. Cordell Reed
Commonwealth Edison Company
cc:
Mr. Michael I. Miller
Isham, Lincoln & Beale
Three First National Plaza
Suite 5200
Chicago~ Illinois 60602
Mr. Doug Scott
Plant Superintendent
Dresden Nuclear Power Station
Rural Route #1
Morris, Illinois 60450
U. S. Nuclear Regulatory Commission
Resident Inspectors Office
Dresden Station
Rural Route #1
Morris, Illinois 60450
Chairman
Board of Supervisors of
Grundy County
Grundy County Courthouse
Morris, Illinois 60450
Regional Administrator
Nuclear Regulatory Commission, Region III
799 Roosevelt Road
Glen Ellyn, Illinois 60137
Gary N. Wright, Manager
Nuclear Facility Safety
Illinois Department of Nuclear Safety
1035 Outer Park Drive, 5th Floor
Springfield, Illinois 62704
Dresden Nuclear Power Station*
Units 1, 2 and 3-