ML20084F525
| ML20084F525 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 02/10/1984 |
| From: | Schroeder C COMMONWEALTH EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML20084F517 | List: |
| References | |
| 8079N, NUDOCS 8405040218 | |
| Download: ML20084F525 (2) | |
Text
Commonwealth Edison s) One First Nationt! Plaza. Chictgf5 O-llhnois C
'~7 Address Reply to: Post Offica Box 767
\\s _,f / Chicago, illinois 6%90 j
February 10, 1984
/ PRINCIPAL STAFF I
v aA j
gppp Mr. James G. Keppler iD/RA DE v
'4[
Regional Administrator IA/RA Df+1SF U.S. Nuclear Regulatory Commission 1C ogqq Region III PA0 SCS 799 Roosevelt Road SGA yL Glen Ellyn, IL 60137 EW_
File A s
Subject:
LaSalle County Station Unit 2 l
Acceptance Criteria for Firecode CT Gypsum Fire Stops j
NRC Docket No. 50-374 References (a):
June 24, 1983 letter from D. L. Farrar to J.
G. Keppler regarding Firecode 1
CT Gypsum Cement Fire Stops, (b):
August 5, 1983 letter from C. W. Schroeder i
to J. G. Keppler, same subject.
(c):
November 23, 1983 letter from C. W. Schroeder
)
to H. R. Denton regarding Fire Protection Commitments.
Dear Mr. Keppler:
In Issue 11, Item 3 of Reference (c), CECO committed to review the acceptance for Firecode CT Gypsum Cement Fire Stops and either provide additional justification for the 3/8" separation criteria or submit a new acceptance criteria to the NRC for approval.
We have decided to change the acceptance criteria because we have no further justification for the 3/8" criteria than that furnished in References (a) and (b).
Also, we do not believe that additional testing will resolve this issue regarding the 3/8" criteria due to the variety and number of cracks and separations that could occur; it would be almost impossible to duplicate actual' field conditions on the test stand.
Another problem with testing cracked fire stops is that none of the fire standards such as NFPA, ASTM and NHL address fire seals with irregular surfaces.
Therefore, we propose to revise'the acceptance criteria for cracks and separations in gypsum cement fire stops from_3/8" wide to less i
than or equal to 1/32" wide by 1" deep.
In other words, only hairline cracks will be accepted, by any crack-or separation-in the seal greater than 1/32" wide by 1" deep will be repaired.
During the meeting with NRR 8405040218 831130 DR ADOCK 05000373 FE8 la Eg4 PDR m
)
~
J. G. Keppler February 10, 1984 on November 16, 1983, it was indicated that a 1/32" separation criteria could be acceptable based on the fire test reports that we submitted to them.
One of these reports, Transco Fire Test Report No. TR-109 dated April 7, 1983, noted the presence of a hairline crack in the fire seal before it was tested, and the test demonstrated that the crack did not degrade the fire stop.
We expect to complete the revision to the surveillance procedures to incorporate the new criteria by March 1, 1984.
To the best of my knowledge and belief the statements contained herein are true and correct.
In some respects these statements are not based on my personal knowledge but upon information furnished by other Commonwealth Edison and contractor employees.
Such information has been reviewed in accordance with Company practice and I believe it to be reliable.
If there are any further questions regarding this matter, please contact this office.
Very truly yours, L ll6h tL)
C. W. Schroeder Nuclear Licensing Administrator im cc:
NRC Resident Inspector - LSCS 8079N l
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