ML20215H922
| ML20215H922 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon, 05000000 |
| Issue date: | 05/07/1987 |
| From: | Morrill P NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Bishop T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| Shared Package | |
| ML20213D283 | List: |
| References | |
| FOIA-84-21 NUDOCS 8705070149 | |
| Download: ML20215H922 (2) | |
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UNITED STATES j.
NUCLEAR REGULATORY COMMISSION
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j REGION V 1480 MARIA LANE,sulTE 210 t,
,#g WALNUT CREEK. CALIFORNIA 94596 MEMORANDUM FOR:
T. W. Bishop, Director, Division of Resident, a
Reactor Projects and Engineering Programs i
THRU:
D. F. Kirsch, Chief, Reactor Projects 'Section No. 3 FROM:
P. J. Morrill, Reactor Inspector 1
SUBJECT:
INSPECTION RESULTS, LAWRENCE LIVERMORE NATIONAL 4
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 l
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 fL 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 i
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.
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Raceway Supports Examined In Detail ---- 81 I
l Raceway Supports Partially Examined ---- estimated to be 200 to 300 Through Wall Anchor nuts / bolts ---- 10 to 20 examined:
One found deficient, item of non-compliance issued, licensee
' reinspected all similiar installations,10 out of several hundred j
(estimated) found lose and tightened.
Other Anchor nuts / bolts ---- 1,000 to 1,500 examined:
i Two were found loose, licensee tightened and documented with Minor Variation Reports (MVR)
Spring Nuts ---- 1,000 to 1,500 examined:
4 Four were found loose, licensee tightened and documented with NCRs j
1 8705070149 870505 PDR FOIA A
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T. W. Bishop 2-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 a MVR 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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l P. J. Morrill Reactor Inspector cc:
M. Mendonca, RV, Diablo Site l
G. Hernandez, RV W. Wade, EG&E, San Ramon i
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