ML20093F827
| ML20093F827 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 07/02/1984 |
| From: | Schnell D UNION ELECTRIC CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| U-72, ULNRC-858, NUDOCS 8407230187 | |
| Download: ML20093F827 (1) | |
Text
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Deb UNION ELECTRIC COM PANY
' 8 90 8 GRATIOT STREET ST, Louis. Mis 5OURI July 2, 1984
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Mr. James G. Keppler Regional Administrator USNRC Region III 799 Roosevelt Road Glen Ellyn, IL 60137 ULNRC-858
Dear Mr. Keppler:
AMENDMENT TO FINAL 10CFR50.55(e) REPORT U-72 PENETRATION SEAL INSTALLATION AND INSPECTION CALLAWAY PLANT Ref:
1)
ULNRC-786 April 4, 1984 2)
ULNRC-804 April 8, 1984 Reference 1, as amended by Reference 2, documents Union Electric's final 10CFR50.55(e) report submitted to NRC Region III regarding silicone foam penetration seals.
In order to prevent separation between the foam and the penetrating items and/or penetration liner, the report stated:
"the time allowed for curing has been extended from one to seven days, an additional sealing caulk has been applied at the seal interface, and the inspectors have been retrained."
Subsequent to this report it has been necessary to modify the requirement for caulking penetrations which are located in the bottom of cabinets or boxed-in in such a manner that excess silicone overlaps the seal.
Any separation that may occur at the edge of the excess silicone would not affect the function of the seal.
Furthermore, in several cases obstructions such as hangers block the top of the seal and prevent complete caulking.
These penetrations are being caulked to the fullest extent.
If separa-tions occur under the obstruction, the gaps would be blocked and, therefore, not detrimental to the performance of the seal.
These actions meet the intent of the fire protection program and do not diminish the effectiveness of the seals.
Very truly yours, 8407230187 840702 i
PDR MDOCK 05000483 8
PDR Donald F. Schnell JJM/lkr cc:
W. L. Forney, NRC Region III Richard DeYoung, Director I&E g\\
9 Missouri Public Service Commission i
y NRC Resident Inspectors, Callaway Plant (2) t 0