ML19329B147
| ML19329B147 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 02/28/1977 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | Heishman R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML19329B143 | List: |
| References | |
| NUDOCS 8001300721 | |
| Download: ML19329B147 (2) | |
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FES 281977 Docket No. 50-346 j
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I MEMORANDlM FOR:
R. F. Heishman. Chief, Reactor Construction and
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~ =' Engineering Support Branch,'RIII, i
FROM:
K. V. Seyfrit. Chief, Reactor Technical Assistance Branch,IE~
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SUBJECT:
DAVIS BESSE UNIT NO.1 - SUPPORT OF CONTROL AND
- ' INSTRUMENT CABLES ROUTED IN VERTICALLY INSTALLED
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f CONDUIT (AITS F30248Hl)
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j This. memorandum confi ms the technical guidance provided to D. W. Hayes l
of your office during the telecon with me on February 8,1977.
Region III through AITS F30248H1 requested headquarters assistance in the O
asta<c= ant of the validity of the action taken by this licensee to con-form to the requirements specified in Section 300-19 of the 1971 National Electric Code (NEC) regarding electrical cables installed in vertical
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raceways. At this facility, the licensee is casuritted to use the NEC for Class IE cable design and installation.
During a special~ electrical-inspection the NRC inspector noted that instrumentation and control cables routed in vertical conduit risers did not-===maan to the~ criteria specified in Section 300-19 of the NEC.
Section 300-19 requires that "... a cable support shall be provided at -
or near the top of the vertical raceway, plus a-support'for och interval _
df spacing as. specified in Table 300-19(a)."
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lE71censee's corrective action-was ~t6. revise their Cable / Conduit Instal-1&Uos Specification No. 7749-E-14. This document provides installation
.. procedures for conduit, raceways, cables, and cable supports in vertical
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conduit risers. - Details of the specific changes made to Specification 7749-E-14 are presented. in the enclosed letter from the Licensee to RIII g j
. dated November 24,1976, Serial No. 160.
p #37 a
RTAB has reviewed this matter and has concluded 'that the revisions p
are appropriate and do not conflict with the intent of NEC Section
- J3 300-19.
Furtherinore, we believe the revised cable installation design is acceptable for support of instrumentation / control cables installed in vertical conduit as described in your memorandici and further described in the Licensee's letter dated Nobember-24,1976 to Mr. Keppler.
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V. D. Thomas 8.0.0..).3 0 0 7.A.I
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M R. F. Heishman 2 ~
FEB281977 In our opinion.- the licensee's requirement which calls for a cable restraint on either instrumentation or control cables which are over 20 feet in length in the vertical and terminated at the upper and exceeds the requirements,of Section 300-19 of the NEC.
In this application, the cable-restraint is primarily for the purpose of l
termination protection and not related to conductor tension strain.
On the basis of our review and discussions' held wit $ Bechtel. Gaithersburg on this issue, we consider the matter closed and plan no further action i
- on it unless requested.
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' K. V. Seyfrit, Chief Reactor Technical Assistance Branch
,v Office of Inspection and Enforcement
Enclosure:
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Ltr., Lowell E. Roe, TECO to James G. Kappler,.RIII, dd.
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11/24/76
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