ML20004F375
| ML20004F375 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/15/1981 |
| From: | Hovey G METROPOLITAN EDISON CO. |
| To: | Snyder B Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20004F376 | List: |
| References | |
| LL2-81-0160, LL2-81-160, NUDOCS 8106180260 | |
| Download: ML20004F375 (2) | |
Text
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Metropolitan Edison Company
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Post Office Box 480 Middletown, Pennsylvan,a 17057 i
Writer's Direct D' s.e n;
June 15, 1981 LL2-81-0160
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0 TMI Program Office
(;k*f Attn:
Dr. B. J. Snyder, Program Director
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U. S. Nuclear RegulTtory Commission g
Washirgton, D.C.
20555 u
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Dear Sir:
Three Mile Island Nuclear Station, Unit 2 (TMI-2)
Operating License No. DPR-73 Docket No. 50-320 Recovery Operations Plan Change Request No. 7 Recovery Operations Plan Change Request No. 7 is enclosed. This change request changes the number of air temperature indications required to be operable per level from two to one to allow for existing system redundancy.
This will allow us more flexibility in scheduling maintenance in the event of a failure, and does not affect plant safety as the temperature variation between indications on the same level is minor.
Sincerely, K. Hovey Vice-President and Director, TMI-2 CKH:JJB:djb Enclosure cc:
L. H. Barrett, Deputy Program Director
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Metropohtan Ed! son Company is a Member of the General Pubbc Utikties System N106180 h
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g Three Mile Island Nuclear Station, Unit 2 (TMI-2)
Operating License No. DPR-73 Docket No. 50-320 Recovery Operations Plan Change Request No. 7 The Licensee requests that the attached changed page 4.6-2 be substituted for the existing page in the Recovery Operations Plan.
Reason for Change The present requirement of 4.6.1.5 requires two temperature indicators at each elevation. This requirement is overly restrictive because it does not allow for the redundancy that was built into the system. The request shows that one indication per level and one spare for obtaining tempera-ture readings is sufficient 13 yield representative results of Reactor Building average air temperature. Additionally, in the event a detector fails, maintenance would be required inside the Reactor Building. By allowing for existing system redundancy we will have more flexibility in scheduling this maintenance and can more easily schedule it during a planned reactor building entry.
Safety Evaluation Justifing Change A review has been performed of 45 data, points spaced over two months, from February 15, 1981 to March 31, 1981. The largest difference between the two i
temperature indicators on the same level was never more then two degrees and often there was no difference. Temperature indicators between all three levels varied no more than five and one-half (5 ) degrees with an average spread of approximately two (2) degrees. Since the spread between tempera-ture elements on a single elevation is so narrow and adequate verification is available by comparison, a reduction to one required sensor per level would not constitute a safety hazard.
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