ML20141P231

Forwards SER Re Util 860312 Plans for Mods to Facility in Order to Reduce Moisture Ingress Into Reactor Vessel.Design Mods Should Reduce Likelihood of Moisture Ingress

ML20141P231
Person / Time
Site:	Fort Saint Vrain
Issue date:	03/14/1986
From:	Heitner K Office of Nuclear Reactor Regulation
To:	Walker R PUBLIC SERVICE CO. OF COLORADO
Shared Package
ML20141P232	List: ML20141P231 ML20141P237
References
TAC-59936, NUDOCS 8603190169
Download: ML20141P231 (3)

Text

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• March 14, 1986 q 1

Docket No. 50-267 Mr. R. F. Walker, President Public Service Company of Colorado Post Office Box 840

Denver, Colorado 80201

SUBJECT:

REVIEW 0F ACTIONS TO MITIGATE M0ISTURE INGRESS INTO THE REACTOR 1 VESSEL We have reviewed your plans for modifications to Fort St. Vrain in order to reduce moisture ingress into the reactor vessel submitted by letter dated March 12, 1986. The results of our review are contained in the enclosed Safety Evaluation.

We conclude that.these modifications to Fort St. Vrain should ~ reduce the likelihood of moisture ingress into the reactor vessel. However, due to the minute moisture content limit (500 ppm) and the close proximity of helium circulator bearing cooling water to the reactor vessel penetration, moisture ingress may still ccuse the reactor moisture content limit to be exceeded.

If the moisture ingress to the reactor continues to exceed the moisture content limit, your staff has committed to further studies and to propose

further design modifications to the plant.

i' If you have any questions or comments, please contact me at (301) 492-8288.

Sincerely, original signed by

8603190169 060314 Kenneth L. Heitner, Project Manager PDR ADOCK 05000267 Standardization and Special P PDR Projects Directorate Division of PWR Licensing-B

Enclosure:

DISTRIBUTION:

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r ac o,, UNITED STATES 8' o NUCLEAR REGULATORY COMMISSION 4 $ E WASHINGTON, D. C. 20555 g [ March 14, 1986 Docket No. 50-267 Mr. R. F. Walker, President' Public Service Company of Colorado Post Office Box 840 Denver, Colorado 80201

SUBJECT:

REVIEW 0F ACTIONS TO MITIGATE MOISTURE INGRESS INTO THE REACTOR VESSEL We have reviewed your plans for modifications to Fort St. Vrain in order to reduce moisture ingress into the reactor vessel submitted by letter dated March 12, 1986. The results of our review are contained in the enclosed Safety Evaluation.

We conclude that these modifications to Fort St. Vrain should reduce the likelihood of moisture ingress into the reactor vessel. However, due to the minute moisture content limit (500 ppm) and the close proximity of helium circulator bearing cooling water to the reactor vessel penet' ration, moisture ingress may still cause the reactor moisture content limit to be exceeded.

If the moisture ingress to the reacto continues to exceed the moisture content limit, your staff has committed to further studies and to propose further design modifications to the plant.

If you have any questions or comments, please contact me at (301) 492-8288.

Sincerely, 1

-Wi% _

C h Kenneth L. Heitner, Project Manager Standardization and Special Projects Directorate Division of PWR Licensing-B

Enclosure:

As stated ,

cc w/ enclosure:

See next page

Mr. R. F. Walker 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. J. W. Gahm, 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. L. W. Singleton, Manager Public Service Company of Colorado Quality Assurance Division P. O. Box 840 Fort St. Vrain Nuclear Station Denver, Colorado 80201 16805 Weld County Road 19-1/2 Platteville, Colorado 80651 Senior Resident Inspector U.S. Nuclear Regulatory Commission P. 0. Box 640 Platteville, Colorado 80651 Kelley, Stansfield & 0'Donnell Public Service Company Building Room 900 550 15th Street Denver, Colorado 80202 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission Office of Executive Director for Operations 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 Chairman, Board of County Commissioners )

of Weld County, Colorado Greeley, Colorado 80631 Regional Representative Radiation Programs Environmental Protection Agency '

1800 Lincoln Street Denver, Colorado 80203 l

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