ML20205F537

Forwards Safety Evaluation Supporting Util Repts on Pcrv Tendon Interim Surveillance & Status Dtd 860122,0616,0719 & 29.Requests More Definitive Evaluation of Water Accumulation Including Assessment of Possible Pathways & Remedies

ML20205F537
Person / Time
Site:	Fort Saint Vrain
Issue date:	03/25/1987
From:	Heitner K Office of Nuclear Reactor Regulation
To:	Robert Williams PUBLIC SERVICE CO. OF COLORADO
Shared Package
ML20205F543	List: ML20205F537 ML20205F555
References
NUDOCS 8703310189
Download: ML20205F537 (4)

Text

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3# REGug ICg UNITED STATES t

. y  ; NUCLEAR REGULATORY COMMISSION

. .E j WASHINGTON. D. C. 20555 March 25, 1987 Docket No. 50-267 Mr. R. O. Williams, Jr.

Vice President, Nuclear Operations Public Service Company of Colorado P. O. Box 840 g Denver, Colorado 80201-0840

SUBJECT:

FORT ST. VRAIN PCRV TENDON SURVEILLANCE We have reviewed your reports on the PCRV tendon interim surveillance and status dated January 22, and July 19, 1986 (P-86042 and P-86463). We also reviewed your submittals of June 16, and July 29, 1986 (P-86394 and P-86491), (

which concerned the PCRV tendons.

The purpose of our review was to monitor progress of the tendon surveillance program, and to determine if degradation of the tendons was of such a degree that action was necessary at this time. The reports indicate that discoloration corrosion was observed in a relatively large percentage of tendons. The staff is directing your attention to that issue during further surveillance.

The June 16, 1986 submittal reported the accumulation of large quantity of water in a tendon tube and end cap. You stated that the water could be a result of evaporation from the interior interstices of the tendon wi.re bundle which has recondensed in the cooler regions of the end cap. However, this has not, in our opinion, been adequately substantiated. Therefore, we request that you submit a more definitive evaluation of this water accumulation, including an assessment of possible pathways, consequences, and remedies. Our request for this evaluation is defined more completely in the enclosed Safety Evaluatico.

The additional information requested should be included ir the next tendon surveillance report.

In conclusion, our reviews of these tendon surveillance reports indicate that the corrosion of the tendons has not reached a level of concern and that the structural integrity of the PCRV is not compromised. The results of the future six-month surveillances of the PCRV tendons will be reported to the staff and our future evaluation of the PCRV will be based upon a review of these forthcoming reports.

I 3310189 870325 p ADOCK 05000267 PDR _

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, Mr. R. O. Williens , Jr. - ?-

.The reporting ard/or recordkeeping reouirements contained in this letter affect fewer than ten respondents; therefore, OMB clearance is not required under P.L.96-511.

Sincerely, N .sv N 1 ' NEd ...s i

Kenneth L. Heftner, Project Manager Standardization and Special Projects Directorate Division of PWR Licensing-P Office of Nuclear Reactor Regulation

Enclosure:

As stated cc w/ enclosure:

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- March 25, 1987 i

9 Mr. R. O. Williams, Jr' . ,

r a The reporting and/or recordkeeping requirements contained;in thiszietter affect fewer than ten respondents; therefore, OMB clearance-is not required under P.L.96-511.

Sincerely, e .w

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, original sianed by s Kenneth L. Reitner,- Project Manager Standardization and Special' Projects Directorate Division of PWR Licensing-B -

Office of Nuclear Reactor RegulationN

Enclosure:

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o Mr. R. O. Williams Public Service Company of Colorado Fort St. Vrain CC:

Mr. D. W. Warembourg, Manager Albert J. Hazle, Director Nuclear Engineering Division Radiation Control Division Public Service. Company Department of Health of Colorado 4210 East lith Avenue P. O. Box 840 .

Denver, Colorado 80220 Denver, Colorado 80201 Mr. David Alberstein, 14/159A Mr. R. O. Williams, Acting Manager.

GA Technologies, Inc. Nuclear Production Division Post Office Box 85608 Public Service Company of Colorado San Diego, California 92138 16805 Weld County Road 19-1/2 Platteville, Colorado 80651 Mr. H. L. Brey, Manager Nuclear Licensing and Fuel Division Mr. P. F. Tomlinson, Manager Public Service Company of Colorado Quality Assurance Division P. O. Box 840 Public Service Company of Colorado Denver, Colorado 80201 16805 Weld County Road 19-1/2 Platteville, Colorado P0651 Senior Resident Inspector U.S. Nuclear Regulatory Commission Mr. R. F. Walker P. 0. Box 840 Public Service Company of Colorado Platteville, Colorado 80651 Post Office Box 840 Denver, Colorado 80201-0840 Kelley, Stansfield & 0'Donnell Public Service Company Building Comitment Control Program Room 900 Coordinator 550 15th Street Public Service Company of Colcrado Denver, Colorado 80202 2420 W. 26th Ave. Suite 100-D Denver, Colorado 80211 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 Chairman, Board of County Comissioners of Weld County, Colorado Greeley, Colorado 80631 Regional Representative Radiation Programs

% Environmental Protectinn Agency 1 Denver Place 999 18th Street, Suite 1300 .

Denver, Colorado 80202-2413

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