ML17299A980
| ML17299A980 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 01/14/1986 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Kirsch D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| ANPP-34648-EEVB, NUDOCS 8602040279 | |
| Download: ML17299A980 (6) | |
Text
<gE(p~o ORg Arizona Nuclear Power Project
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P.O. BOX 52034
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January 14, 1986 ANPP-34648-HRQQgg)P/98.05 gE U. S. Nuclear Regulatory Commission Region V
1450 Maria Lane Suite 210 Walnut Creek, CA 94596-5368 Attention:
Mr. D. F. Kirsch, Deputy Director Division of Reactor Safety and Projects
Subject:
Response
to NRC Follow-up Item 50-529/85-24-01 Cable Pulling Calculations File: 85-056-026
Reference:
NRC Inspection Report 50-529/85-24
Dear Sir:
This letter is to provide follow-up information concerning the classification of cable tension calculations as addressed in the NRC Inspection Report No. 50-529/85-24.
The maximum allowable in-line pulling tension and sidewall pressure for each size and type of cable is established by the cable manufacturer based on the design of the cable, laboratory testing, code requirements, etc.
This is part of the design basis for the cable which, in turn, is used to establish cable installation acceptance criteria.
This information is supplied to the cable purchaser by the cable manufacturer at the time of the initial contract (or shortly thereafter) and is a major part of the cable installation program.
It provides a standard to gauge the possibility of cable damage that may result from the forces that the cable will encounter during installation.
The values established by the cable manufacturer are conservative to be below the forces that will damage the cable.
Bechtel installs cable per WPP/QCI 254.0 which invokes 13-EM-301 for cables pulled in conduit.
13-EM-301 lists the maximum pulling tensions/sidewall pressures along with the formula for calculating expected sidewall pressures to be encountered during installation and other pertinent information supplied by the cable manufacturer.
Bechtel Construction Field Engineering uses the information provided for a proposed cable pull (cable type, routing, etc.) to calculate the expected forces to be encountered during the installation activity per WPP/QCI 254.0.
The calculations are done (recorded) on "Cable Tension Calculation" sheets and the results transferred to the cable installation record.
The-cable installation record is a permanent record.
The cable tension calculation sheets are back up documentation 86o>o+O~
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Mr. D. F..Kirsch Cable Pulling Calculations ANPP-34648 Page 2
used to support the information on the cable installation record.
The calculations and the isometric drawing of the pull substantiate that Bechtel is following the approved cable installation program.
Cable tension calculations are not permanent records to be kept for the life of the plant.
The cable installation record, which is a permanent record, indicates the maximum allowable pulling tension as well as the actual tension observed when a tension monitoring device is used.
The calculation sheets are actually a field engineering construction aid to aid in the planning of a cable pull.
When installing a cable, the calculated values for a proposed cable pull is compared with the maximum tensions/sidewall pressures allowed to see if the cable can be pulled as planned without damage.
If the expected calculated tension exceeds or is too close to the maximum tension allowed, the pull will have to be re-scheduled for a shorter pull.
This precludes having to pull back and re-pull cables due to tensions becoming too close to the maximum allowed during a pull.
Per WPP/QCI 254.0, a tension monitoring device must be used to monitor the actual tension of certain power assisted pulls.
For cables installed in ducts and conduit, a tension monitoring device is used for all Quality Class "Q" and associated cables.
For Quality Class "R" and "S" cables, a tension monitoring device is used where the cable pulling calculations determine that the expected pulling tensions will be 70%
or more of the maximum allowed pulling tension.
For cables installed in cable trays, a cable monitoring device is used for all Quality Class "Q" (including associated cables) and "R" cables.
This is all done to assure that the cables are not damaged during installation and that the electrical integrity of the cables is maintained.
Electrical testing of installed cable is then the determining factor for final acceptance of cable installations.
Electrical testing is performed per WPP/QCI 256.0 and 93EG-OZZ01 as required by ANSI N45.2.4 and Reg.
Guide 1.30.
Therefore, it is the position of ANPP that construction cable pulling calculations are not design calculations.
They are an aid to construction to assure that cables are installed in a timely, but safe manner that precludes damage during installation.
As stated before, cable pulling calculation sheets are not permanent, records required to be retained for the life of the plant.
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ANPP-3Z,6Z,8 Page 3
Xf you have any questions or require additional information, please contact, Mr.
W. F. Quinn of my staff.
Very trul you E.
E.
Van Brunt, Jr.
Executive Vice President Project Director EEVB/TAP/rw cc:
E.
A. Licitra R.
P.
Zimmerman A. C. Gehr
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