ML19263D744
| ML19263D744 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 04/10/1979 |
| From: | Brown S VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 383B, NUDOCS 7904130213 | |
| Download: ML19263D744 (1) | |
Text
Vepco April 10, 1979 Mr. James P. O'Reilly, Director Serial No. 383B Office of Inspection & Enforcement PSE&C/RLR:adw:mc U. S. Nuclear Regulatory Comission Region II 101 Marietta Street, Suite 3100 Docket No. 50-404 Atlanta, Georgia 30303 50-405 Dr.ir Mr. O'Reilly:
On July 5, 1978, NRC Region II was notified that a possible deficiency existed in the design of the Recirculation Spray Coolers for North Anna Units 3 and 4 These coolers were not specifically analyzed for the start-up hy-draulic transient and the associated effects on the structural integrity of the coolers. Also no provisions had been made to vent the cooler during start-up.
We informed you on July 31, 1978 that the rianufacturer of the coolers, Joseph Oat Corporation, would be perfoming a complete analysis of the coolers capabilities regarding the start-up transient. This analysis has been complet-ed.
We are pleased to report that the existing cooler design is entirely satisfactory and capable of withstanding the start-up hydraulic transient.
No modifications are required to the exist kg design.
Provisions have been initiated to vent these coolers to a suitable loca-tion inside the containment. All vent piping will be appropriately sired and supported.
This report is considered a supplemental report on this subject. We anticipate no further correspondence on this subject.
Very truly yours,
&l. d/Ak w y> fn Sam C. Brown, Jr. Senior Vice President - Power Station Engineering and Construction A: Mr. John G. Davis, Acting Director Office of Inspection & Enforcement d.HaroldR.Denton, Director Office of Nuclear Reactor Regulation 0 L 790113 t),Z/ 3}}