ML20091D755

Forwards Application for Amend to License DPR-34,changing Limiting Condition for Operation 4.2.15 to Permit Operation of Prestressed Concrete Reactor Vessel Liner Cooling Water Sys at Lower Temps than Currently Specified

ML20091D755
Person / Time
Site:	Fort Saint Vrain
Issue date:	10/11/1991
From:	Crawford A PUBLIC SERVICE CO. OF COLORADO
To:	Weiss S NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation
Shared Package
ML20091D758	List: ML20091D755 ML20091D759 ML20091D763 ML20091D767
References
P-91298, NUDOCS 9110290009
Download: ML20091D755 (3)

Text

O eubiic service- ===-

P.O. Box 840 Denver CO 80201 0840

^v;;[p))[n,"*I#

October 11, 1991-Fort-St.:Vrain Nuclear Operations

' Unit No. 1 P-91298 U..S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555 ATTN: Dr. Seymour H. Weiss, Director

'Non-Power Reactor, Decommissioning and Environmental Project Directorate Docket No. 50-267 SUBJECTi Proposed Technical Specification Amendment to.LCO 4.2.15

Dear Dr. Weiss:

This 1 s- an amendment request to Fnrt St. Vrain Technical Specification LC0 4.2.15, to permit operation of the Prestressed

< Concrete Reactor Vessel (PCRV) liner cooling water system at somewhat lower temperatures than currently-specified. Due to the low decay heat generation rate of the fuel in the PCRV it is necessary to heat the PCRV liner cooling water system, _ by supplying . st eam from an auxiliary -boiler to coils in a PCRV liner cooling water surge tank, to maintain the average PCRV liner cooling water temperature above the 100 degrees F limit specified in LCO 4.2.15.e). This' amendment would lower'the minimum.specified average cooling water temperature from 100 to 8E ^ grees F, significantly reducing the amount of heat-whien must be stpplied to the PCRV liner cooling water -system, and thereby reducing reliance on the auxiliary boilers.

A- summary of the proposed changes is included as Attachment 1. The proposed changes are included in Attachment 2. A No Significant Hazards Consideration Analysis is included as Attachment 3.

Attachment 4 is Engineering Evaluation EE-46-0007, Rev. 8,

" Engineering Evaluation of Prestressed Concrete Reactor Vessel and Core Support Floor Structures for a Proposed System 46 Temperature Change".

9110290009 911011 PDR- ADOCK 05000267 \N\

.fL P PDR-  ;

s <

f P-91298-

"Page 2. -

Octpber- 11,:1991-

-w :PSC requests =that .the NRC' approve this Technical Specification amendment request'as soon as reasonably possible. Maintaining the PCRV liner cooling water system average temperature above 100 degrees F is no longer!necessary for safety, is wasteful of steam and fuel oil, and requires dependence on auxiliary boilers that have a history

-of reliability problems. During cold winter weather, a boiler outage

-could result-in a Technical Specification violation. In the-summer, PSC can use warm ambient temperatures in the reactor building to heat

-the PCRV and reduce reliance on-the boilers; however, this creates an undesirably hot environment for defueling workers. PSC has installed a new. auxiliary boiler and added a deaerator ',0 improve the reliability of our steam heating equipment, but we are concerned about-the continuing need for and impact of boiler outages.

Should .you= have any = questions concerning this submittal, please contact Mr. M. H. Holmes at (303) 460-6960.

~

-Very truly yours,

/fayf A. Clegg Crawford Vice President

-Nuclear Operations ACC/JRJ:km Attachments cc: Regio'nal Administrator, Region IV Mr. J. B. Baird Senior Resident Inspector

-FortiSt. Vrain Mr. Robert M. Quillin,-Director Radiation Control Division- -

~ Colorado Department of Health 4210 East lith Avenue Denver, CO 80220

l

(

l-Ui1TED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION 7 ~ the Matter of the Facility Operating License) of )

Puolic Service Company of Colorado ) Docket No. 50-267 Fort St. Vrain Unit No. 1 )

AFFIDAVIT A. Clegg Crawford, being first duly sworn, deposes and says: That he is Vice President, Nuclear Operations, of Public Service Company of Colorado, the Licensee herein, that he has read the foregoing Application for Amendment to Appendix A of the Facility Operating License and knows the contents thereof, and that the statements and matters' set forth therein are true and correct to the best of his knowledge, information and belief.

W A. Clegg Crawford '

• k!

Vice President Nuclear Operations STATE OF COLORADO

)

)

COUNTY OF DENVER )

Subscribe and sworn to before me,-a Notary Public on this 11th day of October , 1991 0.LlgLa / u%

Notary Putlic My cammission expires January 6 , 1993.

_ _ _ _ _ _ _ - _ _ _ _ _ - _ _ - _ _ _ _ _ _ _ _ - _ _ _ _ _ _ ___-____-_________-_-__________.]

_