ML20041B178
| ML20041B178 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 02/19/1982 |
| From: | Leasburg R VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Clark R, Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 083, 83, NUDOCS 8202230357 | |
| Download: ML20041B178 (2) | |
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VIRGINIA ELECTRIC AND PowEn COMPANY Ricnuxonn, VinouxrA 20201 4
H. H. L E AMBIJRO vic.i.... swr February 19, 1982 Ns;ctuam OPENATIONS Mr. Harold R. Denton Scrial No. 084 Office of Nuclear Reactor Regulation PSE&CS/DPB:j dm U.
S. Nuclear Regulatory Commission Docket No. 50-339 Washington, DC 20555 License No. NPF-7 Attention:
Mr. Robert A. Clark,-Chief c) p Operating Reactors Branch No. 3 p
Division of Licensing s
(
RECENED 92 Gentlemen 7
FEB 2 21982=-%
% E TDG vtm% CH3 j WGNgEUd Secondary Protection of Containment f
Electrical Penetrations a
North Anna Power Station Unit 2 6
L. 9 The. purpose of this letter is to inform you of our intentions concerning the installation of electrical penetration secondary protection at North Anna Unit 2.
We previously identified 340 power and control electrical penetration circuits that required the addition of secondary protection to meet the license condition in Section 2.C(10) of the North Anna Unit 2 Technical Specifications. Through additional engineering analysis, we have determined that 45 circuits, or thirteen percent of the subject circuits, do not require additional secondary protection to meet this commitment. These circuits are as follows:
1.
There are nine power circuits which we have determined are de-energized during modes of operation when containment integrity is required. As secondary protection of normally de-energized circuits is not required, these circuits will not have secondary protection installed.
2.
There are 36 control circuits for which we have determined adequate seccndary protection exists.
We have further determined that the installation and testing time of the remaining 295 circuits will be approximately twenty-five weeks. The present scheduled outage for refueling is ten weeks. The extensive time for installation and testing is due in part to the quantity of circuits requiring j0g modification and the physical contraints of working in the electrical I
penetration area. Other required modifications such as the Reactor Vessel Ievel Indication System, the Post Accident Sampling System, the Reactor Vessel j
Head and Pressurizer Vent System, and the Hydrogen Recombiner and Hydrogen i
Analyzer Valve Replacement.will limit the available time and work space in the 8202230357 820219 i
w.
Vano w A EtzcTaic am Powem CoxPANY TO Mr. Harold R. Denton electrical penetration area during the first refueling outage. Work in this area will be further constrained by periodic testing of the electrical penetrations and emergency buses as required by the Technical Specifications.
Due-to the extensive installation and testing time involved with this modification, much of which is outage related, it is our intention to install approximately thirty percent of the secondary protection during the upcoming first refueling outage. Depending on plant conditions, approximately five percent will be installed during the scheduled Fall 1982 maintenance outage.
Approximately thirty percent will be installed during full power operation where possible, and the remaining approximately thirty-five percent will be completed during the second refueling outage in the Spring of 1983.
We feel that this is a reasonable e.pproach based on the construction installation requirements outlined above. Extension of the first refueling outage to a sufficient duration to complete this modification would represent an excessive economic burden to Vepco. Therefore, we request your review and approval of the approach we have outlined for completion of the secondary protection modifications for North Anna Unit 2.
We are available at your earliest convenience thould additional information be required.
Very trul you s, Leasburg R.
cc: Mr. R. C. DeYoung, Director NRC Office of Inspection and Enforcement Division of Reactor Operations Inspection Washington, DC 20555 Mr. James P.
O' Reilly, Regional Administrator Office of Inspection and Enforcement Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 i
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