ML20234F383
| ML20234F383 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 09/14/1987 |
| From: | Morrill P NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Bishop T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| Shared Package | |
| ML20234F270 | List: |
| References | |
| FOIA-84-743 NUDOCS 8709230108 | |
| Download: ML20234F383 (2) | |
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JfEMORANDUM FOR:.T. W. Bishop, Director, Division of Resident,-
Reactor Projects and Engineering Programs THRU:
D. F. Kirsch, Chief, Reactor Projects Section No. 3 FROM:
P. J. Morrill, Reactor Inspector
SUBJECT:
INSPECTION RESULTS, LAWRENCE LIVERMORE NATIONAL LABORATORY PERSONNEL EXAMINATION OF RACEWAY SUPPORT BOLTED CONNECTIONS AT DIABLO CANYON (DN 50-275 AND 50-323)
The purpose of this memorandum is to document the results of an examination of bolted connections of raceway supports at Diablo Canyon. This effort was conducted for two reasons; first, we have received allegations related to the adequcy'of the anchor bolts which secure raceway supports to concerte (RV-83-A-033), and second, based on the feed-back I have been receiving from the Lawrence Livermore National Laboratory (contract) personnel, it appeared that adequacy of bolting of raceway supports might be a safety issue.
I requested the contract inspectors to tabulate and transmit to me the number of raceway supports examined, the number of bolts / nuts examined,-and the number and type of deficiencies observed. This information was transmitted to'me on November 8, 1983 and is current as of October 28, 1983.
Raceway Supports Examined In Detail ---- 81 Raceway Supports Partially Examined ---- estimated to be 200 to 300 l
Through Wall Anchor nuts / bolts ---- 10 to 20 examined:
One found deficient, item of non-compliance issued, licensee j
reinspected all similiar installations, 10 out of several hundred (estimated) found lose and tightened.
Other Anchor nuts / bolts ---- 1,000 to 1,500 examined:
Two were found loose, licensee tightened and documented with Minor Variation Reports (MVR)
Spring Nuts ---- 1,000 to 1,500 examined:
I Four were found loose, licensee tightened and documented with NCRs 8709230108 870914' PDR FOIA DEVINE84-743 PDR u.s.
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2-T. W. Bishop t
f Conduit Nuts ---- 1,000 to 1,500 examined:
One was found loose, licensee tightened and documented ~with a MVR Lack of Thread Engagement ---- Several Thousand examined:
One lacked proper engagement, licensee corrected and documented with
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a MVR i
Based on this information, I recommend we continue to use our contract inspectors to examine raceway supports at the current level of effort.
Should the licensee's deficiency rate decrease further however, I think we should examine some other area with potential problems.
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P. J. Morrill Reactor Inspector i
cc:
M. Mendonca, RV, Diablo Site G. Hernandez, RV W. Wade, EG&E, San Ramon i
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