ML20207J948

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Provides Addl Info Re 850414 Request to Amend Licenses DPR-53 & DPR-69,adding Action Statement for Inoperable Diesel Fuel Oil Storage Tank (Dfost).Action Statement Should Not Apply to Dfost 21 from Apr Through Sept
ML20207J948
Person / Time
Site: Calvert Cliffs  Constellation icon.png
Issue date: 07/24/1986
From: Salyards L
BALTIMORE GAS & ELECTRIC CO.
To: Thadani A
Office of Nuclear Reactor Regulation
References
NUDOCS 8607290299
Download: ML20207J948 (3)


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BALTIMORE GAS AND ELECTRIC CHARLES CENTER . P.O. BOX 1475 BALTIMORE, MARYLAND 21203 NUCLEAR ENGINEERING SERVICES DEPARTMENT CALVERT CUFFS NUCLEAR POWER PLANT LUS8Y. MARYL.AND 20657 July 24,1986 U. S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Washington, D. C. 20555 ATTENTION: Mr. Ashok C. Thadani, Director PWR Project Directorate #8 Division of PWR Licensing-B

SUBJECT:

Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317.& 50-318 Request for Amendment

REFERENCES:

(a) Letter from Mr. 3. A. Tiernan (BG&E), to Mr. A. C. Thadani (NRC),

dated April 14, 1985, Request for Amendment 7

Gentlemen:

Reference (a), Change No. 4, proposed a change to our Technical Specifications to add an Action Statement for an inoperable Diesel Fuel Oil Storage Tank (DFOST). Currently, with one of the two DFOSTs still available, all emergency diesel generators are considered inoperable. The Technical Specifications require either returning the emergency diesel generators to operable status within one hour, or being in HOT STANDBY within the next six hours. This clearly makes any DFOST repair or inspection (which requires the tank to be drained) impossible without first shutting down both units. A 72-hour Action Statement was proposed which would allow necessary tank inspections / repairs on one DFOST to be performed during unit operation. This letter provides additional information in response to a verbal request by Mr. S. A. McNeil, NRC Project Manager.

, it is our understanding that the NRC has agreed, in general, with the concept of a 72-hour Action Statement for the DFOSTs. However, the NRC has stated that this Action Statement should not apply to #21 DFOST (which is protected against tornado winds and tornado-generated missiles) during those months when the probability of tornado occurrences is relatively high. Although the probability of a tornado occurring during a 72-hour period is negligible, and the risk associated with such an event was shown to be very small in Reference (a), we acknowledge the NRC's concern. Accordingly, we propose that a footnote be added to Technical Specification 3/4.8.1.1 as follows:

8607290299 860724 ADOCK 05000317 h

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. s Mr. Ashok C. Thadani July 24,1986 Page 2 "This Action Statement is not applicable for #21 Diesel Fuel Oil Storage Tank from April 1 though September 30 due to the higher probability of tornado occurrences during this timeframe."

The data used for determining the timeframe of higher tornado probability is site specific and is summarized in Attachment 1.

Should you have further questions regarding this reply, we will be pleased to discuss them with you.

Very truly yours, w~

L. E. Salyards Principal Engineer -

Licensing Unit LES/BEH/ dim

+

Attachment cc: D. A. Brune, Esquire

3. E. Silberg, Esquire S. A. McNeil, NRC T. Foley, NRC T. Magette, DNR t

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. s ATTACHMENT 1 REPORTED TORNADO FREQUENCY BY MONTH IN A 30 MILE AREA SURROUNDING CALVERT CLIFFS NUCLEAR POWER PLANT (1950 - 1985) l l January 3 February 1 March 1 April ti May 11 June 7 July 10 August 8 j September 11 l October 4 l'

November 1 December 0 Information obtained from the National Severe Storm Center, Kansas City, Missouri, l

l i

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