ML20051Z592
| ML20051Z592 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 04/27/1982 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8205180185 | |
| Download: ML20051Z592 (2) | |
Text
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, Il.
400 Chestnut Street Tower II
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April 27),219M 2 AS 03 BLRD-50-438/82-09 BLRD-50-439/82-09 U.S. Nuclear Regulatory Commission Region II Attr.:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - TEMPERATURE OF NITROGEN SUPPLY -
BLRD-50-438/82-09, BLRD-50-439/82 SECOND INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector D. Johnson on January 14, 1982 in accordance with 10 CFR 50.55(e) as NCR BUI BLP 8201. This was followed by our first interim report dated February 17, 1982. Enclosed is our second interim report. We expect to submit our next report by August 13, 1982.
If you have any questions concerning this tratter, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALf.EY AUTHORITY L. M. Mills, Ma ager Nuclear Licensing Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 Mr. James McFarland (Enclosure)
Senior Project Manager Babcock & Wilcox Company P.O. Box 1260 Lynchburg, Virginia 24505
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An Equal Opportunity Employer
9 ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 TEMPERATURE OF NITROGEN SUPPLY NCR BLN BLP 8201 BLRD-50-438/82-09, BLRD-50-439/82-09 10 CFR 50.55(e)
SECOND INTERIM REPORT Description of Deficiency Nitrogen is used as a cover gas for various safety-related pieces of equipment such as the Reactor Coolant System pressurizer, steam generators, and core flood t,a n ks. B&W document No. 67-1003781-00,
" Plant Limits and Precautiens," lists the minimum temperature requirements for nitrogen to be supplied to this equipment.
Contrary to the above requirements, the present nitrogen system design supplies nitrogen below the required temperature.
B&W document No. 67-1003781-00 was issued in 1978 well after development of the design of the nitrogen system. Since the document did not directly relate to the nitrogen system design, it was not routed to the nitrogen system designers for their review. This condition went unnoticed until the problem was discovered during a design review of one of the systems that interface with the nitrogen system.
Interim Progress A review of the temperature requirements for the nitrogen at the interface points with other systems has been completed and calculations have been nade to size the necessary heaters to heat the nitrogen to levels to meet equipment requirements. TVA is now investigating meac.s to be taken to prevent a recurrence and applicability to other TVA nuclear plants.
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