ML19256E397
| ML19256E397 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 09/28/1979 |
| From: | Daltroff S PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 7911050132 | |
| Download: ML19256E397 (2) | |
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PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET P.O. BOX 8699 PHILADELPHI A. PA.19101
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swistos t. oAtraorr ELacTwic pm o c som September 28, 1979 Re:
Docket Mos.:
50-277 50-278 I2 Bulletin 79-14
'f r. Boyce li. Grier, Director Office of Inspection & Enforcement Region I United States Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 D e ar 'Ir. Grier:
This letter is in response to Item 2 of IE Bulletin 79-14 concerning the review of seismic analysts for 'as-built' accessible safety-related piping.
The inspection and measurement of the accessible piping for both units, originally estimated to be 19,151 feet, was completed on September 17, 1979.
Iiowever, since the original estimate, approximately 3,500 feet of pipe have been added to the
' accessible' classification.
The inspection and measurement of this ad'itional accessible piping will be performed immediately following the inspection and measurement of the Unit 3 inaccessible piping which is being performed during the current Unit 3 refueling outage.
It is expected that the inspection and measurement of the additional accessible piping f or both units will be completed within three weeks after the end of the Unit 3 outage.
At the time September 23, 1979 was projected as the estimated completion date for the accessible piping review, the scope of the work required to accurately transfer field data onto reproducible drawings was underesticated.
The transfer of inf orm.' tion for the 19.151 feet of accessible piping already measured is being expedited in order to complete the evaluation.
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Mr. Boyce H.
Grier Page 2 The final engineering evaluation of all accessible piping is expected to be completed by December 15, 1979.
As of September 27, 1979, the stress analysts had received field 'as-built' information for approximately 11,000 feet of piping of which approximately 9,000 feet had been compared with the seismic analysis input data.
Ten nonconformances have been identified, none of which have been judged significant.
It has also been determined that none of the identified nonconformances would jeopardize system operability.
The results of the inspection program so far have not identified any significant nonconformances, and the existing seismic analyses can be considered valid and all safety related systems operable under seismic loading conditions.
Therefore, we plan to complete Unit 2 inaccessible piping at the next unit outage of sufficient duration that provides access to those inaccessible areas to be measured.
The required inspections and measurements will be performed on or before the end of Unit 2's Spring 1980 refueling outage.
Another report will be submitted by October 30, 1979, updating the status of the inspection and review program.
If you have any questions or require additional information, please do not hesitate to contact us.
Very truly yours, y ) 'jll 6 bj 5
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United States Nuclear Regulatory Commission Office of Inspection and Enforcement Division of Reactor Operations Inspection Washington, DC 20555 1?F' 907 a.
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