ML19351D853
| ML19351D853 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 11/10/1980 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML19351D852 | List: |
| References | |
| NUDOCS 8011200224 | |
| Download: ML19351D853 (3) | |
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O-ENCLOSURE SAFETY EYALUATION OVERCURRENT PROTECTION FOR CONTAINMENT ELECTRICAL PENETRATIONS NORTH ANNA POWER STATION UNIT 2 DOCKET NO. 50-339 In Section 8.8 of Supplement flo.10 to the North Anna Power Station, Unit 2 Safety Evaluation Report we concluded that the design of the primary protection system for the electrical penetrations was acceptable. We further concluded that an acceptable design for the backup overcurrent protection system shall be submitted within six months after the date of licensing and that this backup system shall be installed and operational prior to the startup following the first refueling outage. Accordingly, the operating license was conditioned to reflect this requirement (Condition 2.C(ll) of Operating License NPF-7).
In a letter dated October 10,1980, VEPC0 submitted the following reports regarding the above matter:
(1) " Electrical Penetration Protection - Power Circuits (Primary and Secondary)" and (2) " Electrical Penetration Protection -
l Control Circuits (Primary and Secondary)."
We have reviewed the information provided by the Virginia Electric and Power Company concerning the primary and secondary electrical penetration protection for the power, ~ control and instrumentation circuits. By 'providing primary and independent backup circuit overload protection for the electrical penetrations, the Virginia Electric and Power Company has demonstrated that the electrical penetration assembly will withstand without loss of mechanical integrity, the short circuit current versus time conditions that could occur given a single random failure of the circuit overload protection devices. This
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proposed design is in conformance with our requirements as outlined in the regulatory position C.1 of Regulatory Guide 1.62, Rev. 2 " Electrical Penetration Assemblies in Containment Structure for Light Water Cooled Nuclear Power Plants."
On the basis of our review of the information provided by the Virginia-Electric and Power Company regarding overcurrent protection for containment electrical penetrations, we conclude that the electrical fault protection for the containment penetration is in accordance with our requirements and, 4
i therefore, acceptable. Our office of Inspection and Enforcement will verify prior to the startup following the first refueling outage that electrical fault protection for the containment penetrationsis installed and operational.
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Mr. J. H. Ferguson Executive Vice President - Power Virginia Electric & Powar Company P. O. Box 2~666 Richmond, Virginia 23261 ccs:
Mr. Antnony Gambaradella Office of the Attorney General 11 South 12th Street - Room 308 Richmond, Virginia 23219 Richard M. Foster, Esq.
Musick, Williamson, Schwartz Leavenworth & Cope, P. C.
P. O. Box 4579 Boulder, Colorado 80306 Michael W. Maupin, Esq.
Hunton, Williams, Gay & Gibson P. O. Box 1535 Richmond, Virginia 23212 Mrs. June Allen, President North Anna Environmental Coalition 1105 - C Olive Street Greensboro, North Carolina 27401 Mrs. Margaret Dietrich Route 2, Box 568 Gordonsville, Virginia 22942 Mr. James C. Dunstan State Corporation Commission Commonwealth of Virginia Blandon Building Richmond, Virginia 23209 Alan S. Rosenthal, Esq.
Atomic Safety and Licensing Appeal Board U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Dr. John H. Buck Atomic Safety and Licensing Appeal Board U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Atomic Safety and Licensing Board PaneT U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Mr. T. Webster U. S. Nuclear Regulatory Commission P. O. Box 128 Spotsivania, Virginia 22553