ML20150C944

Safety Evaluation Re Employee Concern Element Rept 23900, Cable & Raceway Program Inadequate

ML20150C944
Person / Time
Site:	Sequoyah
Issue date:	03/11/1988
From:	NRC OFFICE OF SPECIAL PROJECTS
To:
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References
NUDOCS 8803220451
Download: ML20150C944 (2)

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SAFETY EVALUATION REPORT BY THE OFFICE OF SPECIAL PROJECTS EMPLOYEE CONCERN ELEMENT REPORT 23900 "CABLE AND RACEWAY PROGRAP INADEQUATE" TENNESSEE VALLEY AUTHORITY SE000YAH NUCLEAR PLANT, UNITS 1 AND 2 DOCKET NOS. 50-327 AND 50-328 I.

SUBJECT Category:

Engineering (20,000)

Subcategory:

Cable and Raceway Program (23900)

Element:

Cable and Raceway Program Inadequate-(Routing) (23900)

Employee Concern:

IN-85-743-UO6, WI-8S-100-014, and IN-85-743-008 Element Report 23900, Revision 1, dated January 22, 1987, involves three employee concerns.

One concern states, "Pull slips relative to cable pulls are generically inaccurate relative' to length of pull, which causes delays in production due to craf,t having to physically walkdown system." 'A second' concern states, "Computer Cable Routing Program is inadequate and its status system is inadequate." The third concern states, "Conduits are generally overfilled and additional cables are routinely scheduled to be added to the conduits.

This c:uses significant expenditures of manpower in attempting to pull cables where there is no more room available."

II.

SUMPARY OF ISSUE TVA reviewed these concerns and found that there was inadequate feedback from construction to engineering which resulted in improperly reporting installed cable lengths.

TVA also found that the computerized cable routing program does not have proper verification documentation.

Furthermore, this results in cable routing program shortcomings in that the program:

Does not demonstrate compliance with separation requirements'between redundant cables.

Does not demonstrate ccmpliance with requirer.ents for separating cables of different voltage levels.

Does not adequately address raceway fills.

Does not reject erroneous input.

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Does not refuse to route cables in full trays.

Does not reflect actual installed cable lengths, rather, it records cable pull lengths only.

Modification / revision to the cable routing program have not been documented.

Additionally, abandoned cables are not tracked by the cable routing program.

In fact, abandoned unlabeled cables are no longer considered in the cable tray which can lead to cable tray overfill.

III. EVALUATION TVA has addressed or is addressing each observed inadequacy.

Cable length inaccuracies are being resolved and all calculations are being revised based on cable walkdown verifications.

Employee concern report 21301 addresses this issue. The issue of conduit overfill has been addressed in Employee Concern Report 23801.

NRC and its consultant, SAIC, reviewed the employee concern and the TVA find-ings. The errors and shortccmings of the computerized cable routing system are numerous and widespread.

As a result, it is difficult to obtain reliable cable information from the computerized cable routing system.

TVA has committed to implement four steps to overcome the shortconings of the old process.

First, TVA will implement a software Quality Assurance Plan to verify the cable rcuting program.

Then, TVA will verify the cable routing program prior to restart.

Third, TVA will perfonn a manual review of the conduit routing field for all cables to locate the manually routed cables in trays.

Lastly, TVA will load all data relative to cable routing in the program which will check for sepa-ration, voltage segration, raceway fill, etc.

Any cables which are rejected will be investigated for the cause and the installation recenciled accordingly.

TVA has completed the verification of the program and no discrepancies were found (Memo from Raughley, Chief, Electrical Engineering to Beschler, Acting Chief, Engineering and Computer Methods Branch, dated May 21,1987).

Based on the result of the interim verification program, hRC staff agrees with TVA that rest of the TVA program to close this issue can be ccmpleted post restart.

IV.

CONCLUSION The NRC staff concludes that the employee concerns were valid and that TVA's investigation, evaluation and corrective action plan for the concerns as described in EN-23900 SQN, Rev. 1, are adequate.

The NRC staff believes that implementation of these corrective actions will close tha issue of cable and raceway reuting pro However, during a recent audit by the Independent Design Inspection (gram.IDI) team, NRC discovered that two out of ten cables were not routed in accordance with the cable routing progran.

This finding contra-dicts the TVA interim verificaticn of the cable routing program.

We will resolve this issue in accordance with the IDI finding resolution.