ML20215J636

Forwards Advanced Science & Technology Assocs,Inc Rept Re Moisture Ingress at Facility.Agrees W/Subcontractor,Lasl, Conclusions Re Effects of Moisture Inleakage Occurrences Into Prestressed Concrete Reactor Vessel.W/O Encl

ML20215J636
Person / Time
Site:	Fort Saint Vrain
Issue date:	06/16/1987
From:	Heitner K Office of Nuclear Reactor Regulation
To:	Robert Williams PUBLIC SERVICE CO. OF COLORADO
References
TAC-59936, NUDOCS 8706250065
Download: ML20215J636 (3)

Text

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'o, UNITED STATES 8

,n NUCLEAR REGULATORY COMMISSION h

y WASHINGTON, D. C. 20555

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June 16,1987 Docket No. 50-267 Mr. R. O. Williams, Jr.

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

SUBJECT:

M0ISTURE INGRESS AT FORT ST. VRAIN - ADVANCED SCIENCE AND TECHNOLOGY ASSOCIATES, INC. REPORT (TAC NO. 59936)

Please find enclosed a report prepared by Advanced Science and Technology Associates, Inc. (ASTA) concerning moisture ingress at Fort St. Vrain.

This report is dated March 12, 1986.

The NRC had requested our contractor, Los Alamos National Laboratory (LANL),

to evaluate the effects of moisture inleakago occurrences into the prestressed concrete reactor vessel (PCRV).

This evaluation was to cover moisture inleakages which have occurred at the Fort St. Vrain plant over the past few years.

LANL subcontracted ASTA to perform this work.

ASTA (the subcontractor) was asked to evaluate the following areas:

1.

Licensee s data and periodic program reports since plant startup in 1974.

2.

All core components and systems which may be exposed to moisture and helium contaminants.

3.

Potential effects of moisture and helium contaminants on the components and systems identified in Item 2.

The subcontractor was requested to present their findings in the form of a report.

In the first part of the report, the subcontractor discusses the sources of ingressing moisture, the mechanisms by which this moisture leaked into the PCRV and the methods used for its measurement.

The second part contains an evaluation of the individual incidents and the third part discusses potentiai effects of the ingress moisture on different components and systems in the PCRV.

The analysis performed by the subcontractor was thorough and indicates a good understanding of the phenomena analyzed.

In general, we agree with the subcontractor's conclusions.

8706250065 860616 PDR ADOCK 05000267 P

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We are providing this report for your information only.

The results of the studies by LANL containing more specific conclusic's will be the subject of future correspondence.

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Sincerely,

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i Kenneth L. Heitner, Project Manager Project Directorate - IV i

Division of Reactor Projects - III, IV, V and Special Projects l

Enclosure:

As stated j

cc w/o enclosure:

See next page DISTRIBUTION w/o enclosure:

% ocket F11e NRC PDR Local PDR PD4 Reading D. Crutchfield F. Schroeder J. Calvo P. Noonan K. Heitner 0GC-Bethesda E. Jordan J. Partlow ACRS (10)

Fort St. Vrain Flant File PD4 PD4 PD4 KHeitner: as PNoonan JACalvo 6/l(/87 6//(0/87 6//c /87 o

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i Mr. R. O. Williams Public Service Company of Colorado Fort St. Vrain j

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 3

San Diego, California 92138 16805 Weld County Road 19-1/2 l

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 Dublic Service Company of Colorado Denver, Colorado 80201 16805 Weld County Road 19-1/2 Platteville, Colorado 8C651 Senior Resident Inspector i

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 Kelley, Stansfield & 0'Donnell Public Service Company Building Commitment Control Program Room 900 Coordinator 550 15th Street Public Service Company of Colorado i

Denver, Colorado 80202 2420 W. 26th Ave. Suite 100-D i

Denver, Colorado 80211

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Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 j

Chairman, Board of County Commissioners of Weld County, Colorado i

Greeley, Colorado 80631 Cegional Representative Radiation Programs Environmental Protection Agency 1 Denver Place 999 18th Street, Suite 1300 i

Denver, Colorado 80202-2413 i

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