ML20090J519
| ML20090J519 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 03/06/1992 |
| From: | J. J. Barton GENERAL PUBLIC UTILITIES CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| TASK-03-07.B, TASK-3-7.B, TASK-RR C321-92-2066, NUDOCS 9203170280 | |
| Download: ML20090J519 (2) | |
Text
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y GPU Nuclear Corporation f 1 Nuclear
- asar 88 Forkect River, New Jersey 08731-0388 609 971-4000 Writer's Direct Dial Nerber
C321-92-2066 March 6,1992 U. S. Nuclear Regulatory Commission Att:- Document Control Desk Washington, DC 20555 Gentlemen:
Subject:
Oyster Creek Nuclear Generating Station Operating License No. DPR-16 Docket No. 50-219
_ Response to. Request for Additional Information Made by the NRC -
Staff - SEP Topic III-78 Related to Biological Shiel$ Wall s
In.our telephone conversation with the NRC Staff (Messrs. A. Dromerick and H. Ashar) on February 7,1992, we were requested to document the results of our visual inspection of the biological shield wall. The Staff stated that
.the'information is useful te complete their safety evaluation report for the s
_ subject SEP topic.
- Aststated in our. letters of October 3,1991 and July 17, 1991, portions of the
-biological: shield wall at Oyster Creek are exposed to temperatures of around 2.00*F during normal plant _ operation. As we further stated, these temperatures have been determined to have an _ insignificant effect on concrete strength or modulus of elasticity. -However, tv ensure that no significant structural degradation has occurred, visual observations of portions of the biological shield wall._were performed-during the last outage (13R).
As we communicated to your staff previously, the Oyster Creek biological shield wall concrete is covered on both sides by steel plates. These plates prevent inspections of the concrete surface. However, since the pla';es are
. mechanically attached to the concrete, significant concrete degradation would be expected'to cause degradation of the plates.
During the observation of tne shield wall plates, four (4) small cracks were identified. Two (2) of. the cracks were at-re-entrant corners around penetrations and the other two (2) were in seam welds.
It appears that all 9203170280 920306 Sb' -
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C3?l-92-2066 Page 2 four-(4) have existed for several years and none appears to be propagating.
No significant structural degradation was observed.
To ensure that the cracks are not propagating, accessible cracks will be reinspected during the upcoming
-outage (14R)..
ry truly yctgs,_ /
s J.
. Ba' ton Vice resident and Director, Oyster Creek JJB/YN/plp cc: Administrator, Region 1 NRC Resident Inspector Oyster Creek NRC Project Manager I
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