ML20064A747

Discusses Response to Generic Ltr 88-17, Loss of Dhr. Development of Appropriate Tech Spec Changes for Reducing Cooling Flow Rate in Process.Changes Will Provide Increased Margin to Vortexing Conditions

ML20064A747
Person / Time
Site:	Calvert Cliffs
Issue date:	09/18/1990
From:	Creel G BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-88-17, TAC-69730, TAC-69731, NUDOCS 9009280025
Download: ML20064A747 (2)

Text

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Q gy ,9- '1 BALTIMORE y

OAS AND  ;

O E l. E C T R IC j o

CHAFtLES CENTER _e. P.O.- BOX 1475

• BALTIMORE. MARYLAND 21203-1475 i

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{ September 18, 1990 E C .

.U. S. Nuclear Regulatory. Commission 6- =. Washington, DC 20555 i

ATTENTION: Document Control Desk 1

SUBJECT:

Calvert Cliffs Nuclear Power Plant

. Unit Nos.1 & 2; Docket Nos. 50-317 & $0-318  ;

1Resnonse to Generic Letter 88-17 (TACs 69730 & 69731) -

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REFERENCES:

-(a)L Generic Letter ' 88-17, Loss of Decay Heat Removal," dated L . October 417( 1988 L w '

(b)L 1.e'tter from .Mr. J. A. Tiernan -(BG&E) to . NRC - Document' Controli Desk, dated' January- 3.1989, same subject J. h . , . .

(c)J Letter from Mr.' J. A.: ..Tiernan2(BG&E) to NRC Document Control

' Desk, dated January 27, 1989, same subject i ,

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.. Gentlemen:, -

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}; Genericitetter 88-17 described : concerns and recommended actions forf operation -of the Reactor v Coolant System (RCS) and Shutdown Cooling o(SDC) - System - during - reduced i L, inventory conditions. 'In c response. to the Generic Letter, Baltimore Gas . and Electric

- (BGAE) CompanySimplemented the expeditious actions described in ' Reference (b) and is

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l implementing ' programmatic enhancements as described in Reference (c). -The programmatic enhancements in Reference (c) indicated that BG&E would take - action to submit an j amendment request . which -would reduce the minimum flow rates; allowed' by Technical LSpecifications in order l to reduce the likelihood of air ingestion into ; the SDC system i as 3 a Tresult of vortexing. Our intent was to submit that license amendment ' request during April" 1990.

4 Baltimore Gas and ! Electric had previously incorporated reduced SDC flow requirements

~during mid-loop operations at Calvert Cliffs (see Amendment'Nos. 38 and 21 for Units 1-m Land.' 2, respectively, from - 1979). Subsequent to the Generic Letter, BG&E' has N conducted ivortex ? testing and participated in a Combustion Engineering Owners Group ,

-effort to' develop appropriate Technical Specification changes for reducing the shutdown . I cooling flow rate.LThe Owners Group report was received by BG&E in August 1990-and is I currently under review for plant-specific implementation. l 0 +" 49pn743eres i'

-9009280025 900918 y g,

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b Our license amendment request is~ now expected to be submitted during October i990. J

. Since Calvert Cliffs has previously - incorporated reduced SDC ' flow ' requirements ' during mid-loopL operations : the proposed: changes will provide increased margin' to vortexing conditions and additional operational- flexibility. '

Should - you ' have any questions regarding this matter, we will be pleased to discuss them s with you.

Very truly yours j '

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cc: D. A. Brune, Esquire J. E. Silberg, Esquire R. A'. Capra, NRC .

D. G. Mcdonald, Jr., NRC

--T. T. Martin, NRC = ,

L. E. Nicholson, NRC '

R. L McLean, DNR; i

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