ML073480031

Constellation 90-Day Response to Generic Letter 2007-01 - Request for Additional Information

ML073480031
Person / Time
Site:	Calvert Cliffs, Nine Mile Point, Ginna
Issue date:	12/12/2007
From:	Heffley J Constellation Energy Nuclear Group
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
TAC MD4308, TAC MD4309, TAC MD4331, TAC MD4349, TAC MD4350 GL-07-001
Download: ML073480031 (3)

Text

J. M. Heffley Constellation Energy Nuclear Generation Group nd Chief Nuclear Officer 111 Market Place, 2 Floor Baltimore, MD 21202 410-470-5020 December 12, 2007 U. S. Nuclear Regulatory Commission 11555 Rockville Pike Rockville, MD 20852 ATTENTION: Document Control Desk

SUBJECT:

Calvert Cliffs Nuclear Power Plant Unit Nos. 1 & 2; Docket Nos. 50-317 & 50-318 Nine Mile Point Nuclear Station Unit Nos. 1 & 2; Docket Nos. 50-220 & 50-410 R.E. Ginna Nuclear Power Plant Docket No. 50-244 Constellation 90-Day Response to Generic Letter 2007 Request for Additional Information

REFERENCES:

(a) Generic Letter 2007-01, dated February 7, 2007, Inaccessible or Underground Power Cable Failures that Disable Accident Mitigation Systems or Cause Plant Transients (b) Letter from J. M. Heffley (CEGG) to Document Control Desk (NRC),

dated May 7, 2007, 90-Day Response to Generic Letter 2007-01 (c) Letter from D. V. Pickett (NRC) to J. M. Heffley (CENGG), dated November 6, 2007, Constellation 90-Day Response to Generic Letter 2007 Request for Additional Information (TAC Nos. MD4308, MD4309, MD4331, MD4349, and MD4350)

Generic Letter 2007-01 (Reference a) was issued by the Nuclear Regulatory Commission to:

(1) Inform licensees that the failure of certain power cables can affect the functionality of multiple accident mitigation systems or cause plant transients.

(2) Inform licensees that in the absence of adequate monitoring of cable insulation, equipment could fail abruptly during service, causing plant transients or disabling accident mitigation systems.

(3) Ask licensees to provide information on the monitoring of inaccessible or underground electrical cables.

The generic letter also required a response within 90 days of the issue date, which was completed by the submission of Reference (b).

Document Control Desk December 12, 2007 Page 2 Reference (c) requested information as to whether the electronic search described in Reference (b) included all power cable records, regardless of date.

In preparing our response to Reference (a), we searched the electronic files at Calvert Cliffs Nuclear Power Plant, Nine Mile Point Nuclear Station, and R.E. Ginna Nuclear Power Plant for failures of underground and inaccessible power cables of any voltage and within the scope of 10 CFR 50.65 (the Maintenance Rule). These searches were not restricted by date. Thus, the records searched were inclusive of records before and after July 10, 1996.

This letter provides information requested by Reference (c) and does not contain regulatory commitments.

Document Control Desk December 12,2007 Page 3 Should you have questions regarding the information in this submittal, please contact Mr. L. S. Larragoite at (410) 470-3768.

Very truly yours,

___A.i"""(JV..

M. Heffley

\h ~8 ,

Nuclear Officer .

STATE OF MARYLAND TO WIT COUNTY OF ANNE ARUNDEL I, John M. Heffley, state that I am Chief Nuclear Officer, Constellation Energy Nuclear Group, LLC, for Calvert Cliffs Nuclear Power Plant, Inc., Nine Mile Point Nuclear Station, LLC, and R. E. Ginna Nuclear Power Plant , LLC, and that I am duly authorized to execute and file this response on behalf of these companies. To the best of my knowledge and belief, the statements contained in this document are true and correct. To the extent that these statements are not based on my personal knowledge, they are based upon information provided by employees and/or consultants of the companies. Such information has been reviewed in accordance with company practice, and I believe it to be reliable.

jl;lb!jCribed pnd sw~m befor~~ublic. 1 ~'  !~6:

in a : : r the State of Mary and and County of LJ:<A.(.~ this I~ay of h, 2007 .

WITNESS my Hand and Notarial Seal: ~ 111 ~sd.eA'--"

otary Public My Commission Expires:

JMH/EMT cc: D. V. Pickett, NRC Resident Inspector, NRC (Nine Mile)

S. J. Collins, NRC R. I. McLean, Maryland DNR Resident Inspector, NRC (Calvert Cliffs) J. P. Spath, NYSERDA Resident Inspector, NRC (Ginna) P. D. Eddy, NYSOPS