ML20081G004
| ML20081G004 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 10/28/1983 |
| From: | Barnes P COMMONWEALTH EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| REF-SSINS-6820 7410N, IEB-80-16, NUDOCS 8311040060 | |
| Download: ML20081G004 (2) | |
Text
/
\\ Commonwealth Edison d
OO j
- / One First Natiwt Plaza, ChiCTgo.11tinois i
) Addr:ss R; ply 13: Post Offica Box 767
\\
j Chicago, Illinois 60690 October 28, 1983 Mr. James G. Keppler, Regional Administrator
- Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137
Subject:
LaSalle County Station Units 1 and 2 Supplemental Response to IE Bulletin 80-16 Misapplication of Rosemount Transmitters NRC Docket Nos. 50-373/374 References (a):
J. G. Keppler letter to C. Reed dated June 27, 1980 (TJR 80-3)
(b):
T. J. Rausch letter to J. G. Keppler dated August 29, 1980 (LOD 80-185)
(c):
T. J. Rausch letter to J. G. Keppler dated November 10, 1980 (TJR 80-78)
(d):
E. D. Swartz letter to J. G. Keppler dated October 8, 1981 (EDS81-106)
(e):
P. L. Barnes letter to J. G. Keppler dated October 4, 1981 (NL-83-0338)
Dear Mr. Keppler:
In response to Reference (a) request for information contained in IE Bulletin 80-16, Reference (b) documented the results of our LaSalle County Station BOP review.
Additionally, References
-(b), (c), (d) and (e) provided results of the LaSalle County Station NSSS evaluation.
For the BOP applications, Sargent & Lundy informed us that the reported defect would not degrade any safety-related function.
No transmitters were' subject to 140% over or under pressure conditions except for the narrow range drywell pressure sensors, 1PT-CM027, 1PT-CM028, 2PT-CM027 and 2PT-CM028.
Their basis for accepting these with the A option code was the fact that pressure would approach the 140% upper limit (39 psig) under LOCA conditions only, not during any transient, when it would be readily apparent from other parameters that a large line break existed.
8311040060 831028 PDR ADOCK 05000373 OCT311983 ggil G
La
. Additionally, the operator no longer-relies on the readings from these sensors once pressure 1.67 psig.. He/she instead refers to the wide range instruments, driven by 1PT-CM029, 1RT-CM031, 2PT-CM029 and 2PT-CM031, which are sized such that they are unaffected by the high pressure.
While we concur with this analysis and feel that S&L put the problem into proper perspective, post-LOCA operability of IPT-CM027, IPT-CM028, 2PT-CM027 and 2PT-CM028 is required per RG
-1.97.
Ambiguous signals from these sensors combined with the single failure of one wide range instrument could mislead or confuse the operator.- Accordingly, these two instruments are being upgraded to the model 1153 which is fully qualified for the post-LOCA conditions anticipated in its installed location as well as the high-pressure process fluid.
As of this date, these changeocts are complete on Unit 2.
These changeouts are in progress on Unit 1 and are being tracked as a station modification.
To the best of my knowledge and belief the statements contained herein are truc and correct.
In some respects these statements are not based on my personal knowledge but upon information furnished by other Commonwealth Edison employees, contractors and consultants.
Such information has been reviewed in accordance with Company practice and I believe it to be reliable.
Please address any questions that you may have concerning this matter to this office.
Respectfully,
/ 4. A P. L. Barnes Nuclear Licensing Administrator cc:
USNRC Document Control Desk Washington, DC 20555 RIII Inspector - LSCS l
SUBSCRIBED and SWORN to before me this offm/, day af /7hdp/g,L; 1983 fi4.' &LK)
Notary Public~
7410N
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