ML18152B096
| ML18152B096 | |
| Person / Time | |
|---|---|
| Site: | Surry, North Anna, 05000000, 05000434, 05000435 |
| Issue date: | 08/11/1988 |
| From: | Herdt A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 8808250106 | |
| Download: ML18152B096 (3) | |
Text
,.
AUB 111988 Virginia Electric and Power Company ATTN:
Mr. W. L. Stewart, Vice President,*
Nuclear Operations P. 0. Box 26666 Richmond, VA 23261 Gentlemen:
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION TO COMPLETE THE EVALUATION OF WATER SEALED PENETRATIONS We have reviewed your letter of February 29, 1988, which provides your evaluation of systems normally filled with water and operating post accident for qualification as water sealed penetrations post accident.
Your analysis, while providing a descriptive evaluation of how the systems in question act to deliver water to the core, does not provide the information needed to determine that the systems are designed so that a water seal will be established and maintained post accident at a pressure> 1.1 Pa for a duration of 30 days as stated in 10 CFR 50, Appendix J, III C.!.
In order to complete our review we require additional information.
Examples of the type of information needed are provided in the enclosure of this letter.
With regard to penetration 38, your bases for excluding the leakage from the u as found" 1 eak rate is the corrective act ion p 1 an you imp 1 emented.
Under the current regulations you must* obtain an exemption from Appendix Jin order to exclude this leakage. Accordingly, please provide detailed information on your Corrective Action Plan to NRR for a determination that the Plan is or is not acceptable in lieu of repeating the Type A test as required by Appendix J, Paragraph III.A.6.b.
We appreciate your cooperation in this matter.
Enclosure:
Request for Additional Information to Complete the Evaluation of Water Sealed Penetrations cc w/encl:
D. L. Benson, Station Manager N. E. Hardwick, Manager, Nuclear Programs and Licensing (bee w/encl:
(see page 2)
Alan R. Herdt, Chief Engineering Branch Division of Reactor Safety
e Virginia Electric and Power Company 2
bee w/encl:
NRC Resident Inspector DRS. Technical Assistant Commonwealth of Virginia C. Patel, NRR F. Jape, RII F. Cantrell, RII H. Whitener, RII Document Control Desk
~?.r:gb 07 !3Dl88 RII FJt1 071Jj /88 RII FCa~l
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ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION TO COMPLETE THE EVALUATION OF WATER SEALED PENETRATIONS To determine that the systems in question will maintain the penetrations water sealed and pressurized according to the requirements of Appendix J.
Paragraph III C.3, please provide the following information:
- 1.
The design criteria for the pump(s) and associated piping between the water source and the containment penetrations, i.e., Quality Group or Safety Class; seismic design category; protection against missiles, pipe whip, and jet forces; ability to withstand LOCA transient; protection against high energy line break outside containment when required to function; and design class of power supply to pump motors.
- 2.
A description of the water source and the available post-accident inventory to enab 1 e a determination that sufficient water is available to provide a sealing function for 30 days after onset of an accident.
- 3.
A single failure analysis of active components to determine the capability to maintain a pressure head on the containment penetrations.
For example, if one pump failed to operate, discuss whether a head of water could still be applied to the containment penetrations in question; if cross-tie lines would be required to deliver water from one pump train to another to maintain pressure on the penetrations; discuss operator actions that would be necessary to open valves in the cross-tie lines, and whether electrical power would be available to open the valves (e.g., in case of diesel generator failure).
- 4.
A description of the containment isolation valve type and orie*ntation in the lines in question, and the capability of the sealing water from the pumps to preclude containment atmosphere leakage from the valve stems and packing.
That is, discuss whether a water head acting against the valve disk side which faces outward will preclude air inside containment from leaking out past the valve stem or packing.
- 5.
The water pressure which will be maintained at the penetrations under the above conditions.
The above information may not be all inclusive.
Please provide all information, including marked up drawings which supports your conclusion that, under post accident conditions and considering single active failures, the penetrations and valves in question will remain water sealed.
Pertinent information may also include intermittent pump and valve operation, operator actions, procedures which enhance the capabi 1 ity of water seal and how procedures would be used to achieve the sealed condition.