ML20094G722
| ML20094G722 | |
| Person / Time | |
|---|---|
| Site: | Byron, Braidwood, 05000000 |
| Issue date: | 04/13/1984 |
| From: | Swartz E COMMONWEALTH EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML20094G727 | List: |
| References | |
| 8453N, NUDOCS 8408130415 | |
| Download: ML20094G722 (2) | |
Text
7
! if 7 7-.
EN Commonwealth Edison
[ O f) Address Reply to Post Office Box 767) one Fast N1tionil Plata, Ch 4
(
(f Chicago lilinois 60690 April 13, 1984
-Mr.-James G. Keppler Regional Administrator U.S. Nuclear Regulatory Commission Region-III 799 Roosevelt Road Glen Ellyn, IL 60137
Subject:
Byron Station Units 1 and 2 Braidwood Station Units 1 and 2 Pipe Whip Restraint Energy Absorbing Material (EAM) Load Angularity Test Report NRC Docket Nos. 50-454, 50-455, 50-456, and 50-457 References (a):
R. L. Spessard letter to Cordell Reed dated March 31, 1983.
(b):
D. L. Farrar letter to J. G. Keppler dated April 29, 1983.
(c):
R. L. Spessard letter to Cordell Reed dated May 24, 1983.
(d):
B. J. Youngblood letter to D. L.
Farrar dated March 30, 1983.
(e):
E.
D. Swartz letter to H. R. Denton dated May 4, 1983.
(f):
B. J.
Youngblood letter to D. L. Farrar
' dated July 21, 1983.
(g):
E. O. Swartz letter to H. R..Denton dated September 8, 1983.
Dear Mr. Keppler:
The. Reference (a) Byron Station Inspection Report No.
50-454/83-06; 50-455/83-05 contained an item of non-compliance No. 4(a) dealing with angular offset dynamic testing of crushable Energy Absorbing
-Material (EAM) utilized in our pipe whip restraints at Byron and Braidwood Stations.
Our Reference (b) thirty day response in this matter provided our commitment to perform the' requisite EAM testing.
Reference (c) acknowledged our' response and stated that our differing technical views
-in this matter would be decided upon test completion.~ The purpose of this letter is to provide the results'of the EAM Test Program, and provide ~our evaluation of these results as they apply to the pipe whip restraints utilizing EAM at_our Byron and Braidwood Stations.
\\\\
8408130415 840413 PDR ADOCK 05000454 APR 101984. fo /
PH f
y
,;g
- s J. G. Keppler April 13, 1984 Concurrent:with our discussions with your Staff in this matter
.were.the following communications with NRR.
Reference (e) provided our
- response to the Reference-(d) NRR request for additional information, Question 110.73'from the Mechanical Engineering Branch.
Reference (f) provided Commonwealth Edison.with an NRR status report in this matter.
Reference (g) provided our response-to certain of the statements contained in the: status report and provided the EAM Test Program for NRR
. review.
Reference (b) expressed our belief.that based on our previous investigations into the effects.of load angularity through detailed finite element analysis and testing of EAM relative to our LaSalle County
-Station, the effects of'similar load angularities in the pipe. whip restraints at Byron and Braidwood Stations would not significantly affect the ability of the pipe ' whip ' restraints.to perform their intended function.
Among other conclusions drawn from the results of this additional EAM-Test Program, it has confirmed that there appears to be no apparent: loss in the energy absorbing capacity of EAM due to load angularity.
Enclosed for your information and review is a copy of our
-evaluation.
In our judgment, the energy absorbing capability.of the EAM
'in the configurations utilized in the Byron and Braidwood Stations pipe whip restraints has been confirmed by the Hexcel/ MCI test results..
-By copy'of this letter'to NRR, we are also requesting.their review of the enclosed report.
We would be happy to discuss any-
' remaining concerns that the. Region or NRR may have.in this matter at your earliest convenience.
Please address any questions that you or your staff may have concerning the EAM Test Program results to this office.
Very truly yours, 7
/
74/
E.
ouglas Swar Nuclear Licensing Administrator 1m l
-Attachment cc:
J.1A. Stevens - LB1 L. N. Olshan - LB1 I.
T. Yin - Region III 8453N
.