ML20112E736

Application to Amend Licenses DPR-53 & DPR-69,changing Tech Spec Table 3.6-1 to Reduce Response Time for Isolation Valves MOV-6900 & 6901

ML20112E736
Person / Time
Site:	Calvert Cliffs
Issue date:	03/21/1985
From:	Lundvall A BALTIMORE GAS & ELECTRIC CO.
To:	John Miller Office of Nuclear Reactor Regulation
Shared Package
ML20112E740	List: ML20112E736 ML20112E743
References
NUDOCS 8503270139
Download: ML20112E736 (2)

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BALTIM ORE GAS AND ELECTRIC CHARLES CENTER . P. O. BOX 1475. BALTIMORE, MARYLAND 21203 ARTHUR E. LUNDVALL. JR.

VICE PRESIDENT SUPPLY March 21,1985 Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555 ATTENTION: Mr. James R. Miller, Chief Operating Reactors Branch #3 Division of Licensing

- SUB3ECT: Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317 & 50-318 Containment Venting Supplemental Information

REFERENCES:

(a) BG&E letter from Mr. A. E. Lundvall, Jr., to Mr. 3. R. Miller, NRC, dated December 22,1983 (b) BG&E letter from Mr. A. E. Lundvall, Jr., to Mr. 3. R. Miller, NRC, dated March 26,1984 (c) BG&E letter from Mr. A. E. Lundvall, 3r., to Mr. 3. R. Miller, NRC, dated February 4,1985 Gentlemen:

In references (a) and (b) we requested license amendments for Units 1 and 2 which would permit use of the existing containment hydrogen purge exhaust line as a containment venting system during normal operations. Reference (c) addressed the concerns that arose while reviewing the LOCA-while-venting analysis originally submitted in support of the proposed license amendments and provided a reanalysis using a higher source term and a shorter, more realistic isolation valve closure time.

The response time credited for isolation valves MOV-6900 and -6901 in the reference (c) reanalysis _is less than the current Technical Specification value of 20 seconds. We, therefore, noted our intention to reduce the Technical Specification isolation time limit to 15 seconds to be consistent with our analysis. We request this proposed change be reviewed and approved concurrently with references (a) and (b). Please refer to the attached pages noting the change.

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- Mr. 3. R. Miller -

March 21,1985 Page 2 Should you have any questions regarding this matter, please do not hesitate to contact us.

Very truly yours, 1 >> -

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k / 1 AEL/3ET/t;m Attachments

-cc: D. A. Brune, Esquire G. F. Trowbridge, Esquire D. H. 3cffe, NRC T. Foley, NRC T. Magette, DNR l

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