ML19289E807
| ML19289E807 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 04/10/1979 |
| From: | Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML19289E801 | List: |
| References | |
| 171, NUDOCS 7905290125 | |
| Download: ML19289E807 (3) | |
Text
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'l Mr. James P. O'Reilly, Director 9.
Of fice of Inspection and Enforcement P0/FHT:scj y
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Docket No.:
50-338 c-U. S. Nuclear Regulatory Commission
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Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 License No.: NPF-4
Dear Mr. O'Reilly:
We have reviewed your letter of March 16, 1979, in reference to the inspec-tion conducted at North Anna Power Station on February 28 to March 2, 1979, and reported in IE Inspection Report Nos. 50-338/79-11 and 50-339/79-16. Our response to the specific infrac. tion is attached.
We have datermined that no proprietary information is contained in the Accordingly, the Virginia Electric and Power Company has no objection reports.
to these inspection reports being made a matter of public disclosure.
Very truly yours, 6.272 vJia/d p C. M. Stallings Vice President-Power Supply and Production Operations Attachment ec:
Mr. Albert Schwencer D*"
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RESPONSE.10 NON-COMPLIANCE ITEMS REPORTED IN IE INSPECTION REPORT _NO.
50-338/79-11 AND NO. 50-338/79-16.
NRC COMMENT A.
As required by Section 2.2.1.a of the North Anna Effluent Technical Specification "The concentration of radioactive materials released in liquid waste effluents to unrestricted areas from all reactors at the site shall not exceed the values specified in 10CFR Part 20, Appendix B. Table II, Column 2, for radionuclides other than noble gases and 4 x 10-5 uCi/ml f,or noble gases.
Contrary to the above, on February 27, 1979, the liquid discharge from the Unit 2 volume control tank entered an unrestricted area in Unit 2.
The concentration of iodine 131 was 310 times the value specified in 10 CFR Part 20. Appendix B, Table II, Column 2.
This is an infraction.
RESPONSE
The above infraction is correct as stated.
Specifically, pursuant to section 2.201 of the NRC's " Rules of Practice", Part 2. Title 10 Code of Federal Regulations, the following information is submitted:
1.
Corrective steps taken and results e-hieved:
Imediately upon discovery of the contaminated water in the Unit 2 reactor vessel and sump, the applicable Emergency Plan Implementing Procedures were put into action.
These actions included the eva-cuation of Unit 2 containment, collection of air samples and smears, and the sampling of various tanks and systems to determine the source and extent of the contamination. Also, all known contaminated systems and all possible contaminated systems were isolated and tagged out.
Next, a system by system search was begun to determine the source and the pathway that the contamination took to go from Unit 1 to Unit 2.
This search revealed t. hat the Unit 1 sampling system was leaking reactor coolant through the relief valve on the Unit 1 Hydrogenated Contaminated Liquid Purge Header to the Unit 2 VCT via the Unit 2 Hydrogenated Contaminated Liquid Purge Header relief valve.
This system was left isolated pending the installation of new relief valves.
The contaminated water that remainedin the Unit 2 sump and vessel was then pumped to the High Level Liquid Waste System in the Auxiliary Building. These systems anc' associated piping were then flushed with water to the High Level Liquid Waste System until radioactivity levels were below MPC. Also, all the soil around a hose leak, which was contaminated, was picked up and put in 55 gallon drums (17 H type).
Finally, the area around the stonn drain input which had minor contamination, was decontaminated.
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2.
Corrective action to avoid further on-compliance:
Currently, the Unit 1 Hydrogenated' Contaminated Liquid Purge Header is isolated from the Unit 2.VCT. This isolation will remain in effect until the Unit 2 Sampling System and Hydro-denated Contaminated Liquid PurrJe Header are operational. At that time, Unit 2 containment will be a controlled area and the Unit 2 VCT, a contaminated system.
To insure that an uncontrolled and unplans.ed release does not recur, approval from Health Physics is required prior to operation of the Unit 2 containment sump pump. Also, the Unit 2 VCT is curreri ly being sampled every eight hours.
To correct '.ne main cause of the event,.the relief valves and/or internals ' sill be replaced pending arrivals of replacements.
3.
Date when full compliance will be achieved:
Full compli;ance was achieved on March 6,1979 when the ccrrective steps delineated in Sectior 1 were completed.
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