ML17194A195
| ML17194A195 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 10/08/1981 |
| From: | Norelius C NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Reed C COMMONWEALTH EDISON CO. |
| Shared Package | |
| ML17194A196 | List: |
| References | |
| NUDOCS 8110140218 | |
| Download: ML17194A195 (3) | |
See also: IR 05000237/1981025
Text
Docket No. 50-237
Commonwealth Edison Company
ATTN:
Mr. Cordell Reed
Vice President
Post.Office Box 767
Chicago, IL
60690
Gentlemen:
OCT 8
1981
Thi.s refers to the special safety inspection conducted by Mr. I. T. Yin
of this office on September 6-7, .1981, of activities at Dresden Station,
Unit 2, authorized by NRC Operating License No. DPR-19.
During this inspection, our inspector examined repairs to the damaged
HPCI pump drive turbine steam supply line suspension system which
- resulted from adverse transient loading. The measures that are used
to remove line condensate and the applicable quality records were also
r'eviewed by our inspector.
Based on this inspection, we are satisfied
that the provisions in our Immediate Action Letter of September 4, 1981,
have been appropriately addressed.
In view of the past history of HPCI turbine steam supply line operating
problems, and our piping system walkdown, inspection findings, we request
that you initiate the following actions to assume broad and lasting cor-
rective measures:
1.
Modify the permanent system to improve line condensate drainage.
2.
Review and re-evaluate the originial S&L high energy line break
analysis including established.design criteria, the structural
assembly and support component calculations .
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Commonwealth Edison Company
- 2 -
OCT 8 . 1981
3.
Provide a fatigue analysis that considers the present vibratory and
prior water hammer loading effects to assess the remaining system safe
operation transient life cyclea.
4.
Provide the IE Bulletin No. 79-14 piping system analysis documentation
including computer modeling of the seismic restraints and calculated
primary stress levels comparied with your committed Code allowables.
Please provide this office schedules for completion
above within 15 days from .the date of this letter.
mentation will be made available for NRC*review and
inspections of the above items will be performed by
of Items 1 through 4
All completed docu-
evaluation.
Followup
our inspectors.
In addition to the above, based on the Dresden Station, Unit 2 experience,
perform similar piping and pipe suspension system inspections for Dresden
Station, Unit 3, Quad Cities, Units 1 and 2. These inspection are to verify
the existance and the extent of condensate in the pipe and to determine
whether or not hanger cold position settings deviate from design requirements.
I
Where applicable, your response may reference other correspon:dense submitted
on this matter subsequent to the inspection.
In accordance with 10 CFR 2.790 of the Commission's regulations, a copy of
this letter and the e.nclosed inspection report will be placed in *the NRC' s
Public Document Room.
If this report contains any information that you or
your contractors believe to be exempt from disclosure under 10 CFR 9.5(a)(4),
it is necessary that you (a) notify this office by telephone within seven (7)
days from the date of this letter of your intention to file a request for
withholding; and (b) submit within twenty-five (25) days from the date of
this letter a written application to this off ice to withhold such inf or-
mation.
Section 2. 79.0 (b) (1) requires that any such application must be
accompanied by an affidavit executed by the owner of the information which
identifies the document or part sought to be withheld, and which contains
a full statement of the reasons which are the bases for the claim that the
information should be withheld from public disclosure.
This section .further
requires the statement to address with spec.ificity the considerations listed
The information sought to be.withheld shall be incor-
porated as far as possible into a separate part of the affidavit. If we do
not hear from you in this regard within the specified periods noted above, a
copy of this letter and the enclosed inspection report will be placed in the
Public Document Room.
Commonwealth Edison Company
- 3 -
OCT 8
1981'
We will gladly discuss*any .questions you have concerning this inspettion.
Ericlosure: IE Inspection
Report No. 50-237/81-25
cc w/encl:
Louis 0. DelGeorge
Director of Nuclear
Licensing
Sincerely,
C,e?V~~~-,
C. E. Norelius, Director
Division of Engineering and
Technical Inspection
.D. J. Scott, .Sta. Supt.
DMB/Document Control Desk (RIDS)
Resident Inspector, Riil
Mary Jo Murray, Office of
Assistant Attorney General
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