ML17304B032

Forwards Request for Addl Info Re Seismic Adequacy of Nylon Cable Ties.Info Should Be Provided within 45 Days from Receipt of Ltr

ML17304B032
Person / Time
Site:	Palo Verde
Issue date:	02/07/1989
From:	Chan T Office of Nuclear Reactor Regulation
To:	Karner D ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
References
NUDOCS 8902220348
Download: ML17304B032 (7)

Text

February 7,

1989 ~

Docket Nos.:

STN 50-528, STN 50-529 and STN 50-530 Mr. Donald B. Karner Executive Vice President Arizona Nuclear Power Project Post Office Box 52034 Phoenix, Arizona 85072-2034 DISTRIBUTION NRC-5 Local PDRs PD5 Reading MVirgilio JLee TLChan OGC EJordan BGrimes ACRS (10)

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION - SEISMIC ADEQUACY OF NYLON CABLE TIES AT PALO VERDE NUCLEAR GENERATING STATION In an inspection report dated March 30, 1988, the NRC Safety System Functional Inspection (SSFI) team identified a concern regarding the seismic adequacy of nylon cable ties which were used to support electrical cables in vertical cable trays at the Palo Verde Nuclear Generating Station.

ANPPs response to this issue was provided in a submittal dated June 10, 1988.

Based on our review of the submittal, we find that additional information is needed in order to complete our evaluation.

He ask that the'nformation requested by the Enclosure be provided within 45 days from receipt of this letter, or provide an alternate schedule for doing so within 15 days.

The reporting and/or recordkeeping requirements of this letter affect fewer than ten respondents; therefore, OMB clearance is not required under P.L.96-511.

Sincer ely,

/s/

Enclosure:

As stated cc:

w/enclosure See ne t page ~&~

DRSP/PD5 DRSP/D:PD5 TLChan:dr GM ighton 2/ 6 /89 2/

/89 OFFICIAL RECORD COPY Terence L. Chan, Senior Project Manager Project Directorate V

Division of Reactor Projects - III, IV, V and Special Projects Office of Nuclear Reactor Regulation gF I

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Wp~g4 UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 February 7,

1989 Docket Nos.:

STN 50-528, STN 50-529 and STN 50-530 Mr. Donald B. Karner Executive Vice President Arizona Nuclear Power Project Pest Office Box 52034 Phoenix, Arizona 85072-2034

SUBJECT:

REQUEST fOR ADDITIONAL INFORMATION - SEISMIC ADEQUACY OF NYLON CABLE TIES AT PALO VERDE NUCLEAR GENERATING STATION In an inspection repot t dated March 30, 1988, the NPC Safety System Functional Inspection (SSFI) team identified a concern regarding the seismic adequacy of nylon cable ties which were used to support electrical cables in vertical cable trays at the Palo Verde Nuclear Generating Station.

ANPPs response to this issue was provided in a su'bmittal dated June 10,

'.988.

Based on our review of the submittal',

we find that additioral information is needed in order to complete our evaluation.

We ask that the iIIformation requested by the Enclosure be provided within 45 days from receipt of this letter, or provide an alternate schedule for doing so within 15 days.

The reporting and/or recordkeeping requirements of this letter affect fewer than ten respondents; therefore, OMB clearance is not required urder P.L.96-511.

Sin

ely,

'I

Enclosure:

As stated Terence L. Chan, Senior Project Manager Project Directorate V

Division of Reactor Projects - III, IV, V and Special Projects Office of Nuclear Reactor Regulation cc:

w/enclosure See next page

Mr. Dorald B. Karner Arizona Nuclear Power Project Executive Vice President Post Office Box 52034

Phoenix, Arizona 85072-2034 Pa lo Verde CC:

Arthur C. Gehr, Esq.

Snell 5 Wilmer 3100 Valley Center

Phoenix, Arizona 85073 Mr. James M. Flenner, Chief Counsel Arizona Corporation Commission 1200 West Washington

Phoenix, Arizona 85007 Charles R. Kocher, Esq. Assistant Council James A. Boeletto, Esq.

Southern Ca 1 iforni a Edi son Company P. 0.

Box 800

Rosemead, California 91770 Mr. Mark Ginsberg Energy Director Office of Economic Planning and Development 1700 l est Washington - 5th Floor

Phoenix, Arizona 85007 Mr. Wayne Shirley Assistant Attorney General Bataan Memorial Building Santa Fe, Hew Mexico 87503 Hr. Tim Polich U.S. Nuclear Regulatory Commission MC-03 Box 293-NR Buckeye, Arizona 85326 Regional Administrator, Region V

U. S. Nuclear Regulatory Comission 1450 Maria Lane Suite 210 Walnut Creek, California 94596 Ms. Lynn Bernabei Government Accountability Project of the Institute for Policy Studies 1901 gue Street, NW Washington, DC 20009 Mr. Charles B. Brinkman, Manager Washington Nuclear Operations Combustion Engineering, Inc.

7910 Woodmont Avenue Suite 1310

Bethesda, Maryland 20814

Arizona Nuc',ear Power Project Palo Verde CC:

Chairman Arizona Corporation Commission Post Office Box 6019

Phoenix, Arizona 85003 Arizona Radiation Regulatory Agency ATTN:

Ms. Clara Palovic, Librarian 4814 South

.40 Street Phoenix, Arizona 85040 Mr. Charles Tedford, Director Arizona Radiation Regulatory Agency 4814 South 40 Street

Phoenix, Arizona 85040 Chairman Maricopa County Board of Supervisors 111 South Third Avenue Phoenix, Arizona 85003

Enclosure RE(UEST FOR ADDITIONAL INFORt1AT ION l.

Describe the nature of the plastic nylon ties as it relates to the environments expected throughout the installation {describing the ambient conditions, i.e.,

maximum and minimum temperatures, humidity, etc.)

on a long-term 40 year life basis.

At what points or locations in the

plant, were the temperature estimates made?

What were the maximum elevated temperatures

found, and what long term effects on th'e nylon ties can be expected from these temperatures?

2.

Provide the basis for the determination that only 1E3 rads, total integrated dose (TID), of radiation exposure will occur on the nylon tie wraps over a 40 year life cycle of the plant.

At what points or at what locations in the plants were these exposures estimated?

3.

Given the exposure of 5E5 rads (EPRI NP-1558 and NNNP-4172 SP) as the threshold (i.e., initial onset of detectable tie degradation) what property deterioration, e.g., relaxation, loss of tensile strength, or embrittlement can be expected of the plastic ties?

To what extent would such degradation of the properties affect your analysis results?

4.

What assurance, and on what basis, can be given that in the long-term 40 year life cycle of the plant; (1) the plastic ties will not break under horizontal seismic forces imposed on the ties by the cable bundles, and (2) the terminal connections will not undergo tension due to slippage of cables under the combined effects of cable dead weight, vertical seismic loads and long term degradation of plastic ties?

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