ML20210T436

Requests Publication of Fr Notice of Consideration of Issuance of Amend to License DPR-34 & Proposed NSHC Determination & Opportunity for Hearing on 870115 Request Re Operation of evaporator-economizer-superheater Sections

ML20210T436
Person / Time
Site:	Fort Saint Vrain
Issue date:	02/11/1987
From:	Berkow H Office of Nuclear Reactor Regulation
To:	NRC
References
TAC-63576, NUDOCS 8702180184
Download: ML20210T436 (4)

Text

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b UNITED STATES

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NUCLEAR REGULATORY COMMISSION g

p WASHINGTON, D. C. 20555 l

S February 11, 1987 l

Docket No. 50-267 MEMORANDUM FOR: Sholly Coordinator FROM:

.Herbart N. Berkow, Director Standardization and Special Projects Directorate Division of PWR Licensing-B

SUBJECT:

REQUEST FOR PUBLICATION IN BIWEEKLY FR NOTICE - NOTICE OF CONSIDERATION OF ISSUANCE OF AMENDMENT TO FACILITY OPERATING LICENSE AND PROPOSED NO SIGNIFICANT HAZARDS CONSIDERATION DETERMINATION AND OPPORTUNITY FOR A HEARING Public Service Company of Colorado, Docket No. 50-267, Fort St. Vrain Nuclear Generating Station. Platteville, Colorado Date of amendment request: canuary 15, 1987 Description of amendment request:

The ifcensee has proposed changes to LCO 4.3.1 of the Fort St. Vrain (FSV) Technical Specifications to require both evaporator-economizer-superheater (EES) sections and both reheater sections be available during operation at power as the minimum number of operable heat exchangers. The FSV Technical Specifications currently require both the reheater section and the EES section of one steam generator and either the reheater section or the EES section of the other steam generator be operable for the removal of decay heat.

For power levels above 39 percent of full power, the plant will only use the two EES sections to remove decay heat for the Class IE and Appendix R design basis shutdowns. The licensee is retaining the operability requirement for the reheater sections because they can be used for other accident sequences.

A second proposed change to LCO 4.3.1 is that the EES sections shall be capable of receiving water from both the Emergency Condensate Header and the Emergency Feedwater Header instead of the former minimum allowable of only one of these emergency headers.

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Cl N Basis for proposed no sionificant hazards consideration determination:

Recent analyses of Safe Shutdown Cooling with a single EES have shown.

that maximum fuel temperatures remain well below a level where significant fuel damage could occur, the primary coolant pressure boundary remains intact and the PCRV safety valves remain seated. The_ fuel temperatures are lower than those than~would have occurred had decay heat been removed with the reheater section. Thus, the consequences of the Safe Shutdown Cooling accident previously evaluated will not be increased by the LC0 4.3.1 Basis change that omits reliance on the reheaters for Safe Shutdown Cooling.

In addition, LCO 4.3.1 would require that the EES sections can be supplied by water from either the Emergency Condensate Header or the Emergency Feedwater Header. For these reasons, it is considered that this proposed change does not involve an increase in the probability or consequences of an accident previously evaluated.

The revision to LCO 4.3.1 will not create a new or different kind of accident. The accident descriptions for Safe Shutdown Cooling with a fire pump and other Safe Shutdown List equipment in the FSAR (Sections 10.3.9, 14.4.2.1 and 14.4.2.2) will remain essentially as written.

FSV will continue to meet the NRC's single failure requirements. FSV continues to meet the General Design Criteria commitments in Appendix C of the FSAR without relying on the reheaters for Safe Shutdown Cooling.

Reliance on the EES sections of the steam generators is considered desirable because of their. larger heat transfer capability and the fact that their capabilities have been demonstrated in normal plant operation. Thus, the proposed fully redundant EES sections potentially offer a greater margin of safety. The revision of LCO 4.3.1, requiring both EES sections to be

.. ;7 capable of receiving water from both the Emergency Feedwater Header and the Emergency Condensate Header, does not decrease the_ margin of safety over the-i fonner minimum requirement of the capability of receiving water from only 4 -

one of-these headers.

Based on the above evaluation..it is the staff's initial determination 4-i

.that operation of Fort St. Vrain in accordance with the proposed LCO changes will not:

(1) involve a significant increase in the probability or-consequences of an accident previously evaluated; (2) create the possibility of a new or different kind of accident from any accident previously evaluated; or (3) involve a significant reduction in any margin l

of safety. Hence, the staff proposes to determine that this proposed change would involve no significant hazards consideration.

_ Local Public Document Room location: Greeley Public Library, City Coinplex l

Building, Greeley, Colorado i

Attorney for licensee: Bryant O'Donnell, Public Service Company of Colorado, P. O. Box 840, Denver, Colorado 80201-0840 i

NRC Project Director: Herbert N. Berk b

f i

I erbert N. Berkow, Director Standardization & Special Projects Directorate j

Division of PWR Licensing-B i

i cc:

K. Heitner P. Noonan I

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R February 11, 1987 j

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capable of receiving water from both the Emerrancy Icedwater Header and the Emergency Condensate Header, does not decrease the margin of safety over the former minimum requirement of the capability of receiving water from only l

one of these, headers:,

s.

Based on the' abo.s evalbation, it is the staff's-initial determination that operation cf Fort St. Vrain in accordance with the proposed LCO changes will not:

(1) involve a significant increase in the probability or consequences of an accident previously evt.luated; (2) create the possibility of a new or different kind of asc Nent from any accident 7

previouslyevaluated;or(3)ihvolveasignificantreductioninanymargin of safety. Hence,thestaffpryposestodetermine\\ that this proposed change would involve no'significant hazards consideration.

Local Public Document Room location: Greeley Public Library, City Complex Building, Greeley, Colorado Attorney for licensee:

Bryant O'Donnell, Public Service Company of Colorado,

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P. O. Box 840, Denver, Colorado 80201-0840' NRC Project Director: Herbert N. Berkow

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original signed by s

Herbert N. Berkow, Director Standardization & Special Projects Directorate Division of PWR Licensing-B cc:

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