ML20083P470
| ML20083P470 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 01/28/1983 |
| 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 8302030490 | |
| Download: ML20083P470 (2) | |
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TENNESSEE VALLEY AUTHORITY 9
CH ATTANOOGA. TENNESSEE 374o1 400 Chestnut Street Tower II January 28, 1983 ca BLRD-50-438/83-09 g
BLRD-50-439/83-06
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U.S. Nuclear Regulatory Commission gg 7
Region II
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Attn:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, Suite 3100 ro' Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - BACKFLOW NOT CONSIDERED FOR ERCW BOOSTER PUMP SHUT 0FF - BLRD-50-438/83-09, BLRD-50-439/83 FIRST INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector L. Watson on December 30, 1982 in accordance with 10 CFR 50.55(e) as NCR BLN BLP 8233 Enclosed is our first interim report. We expect to submit our next report by May 6, 1983 If you have any questions concerning this matter, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, 4
TENNESSEE VALLEY AUTHORITY L. M'. Mills, Manager Nuclear Licensing Enclosure Mr. Richard C. DeYoung, Director (Enclosure) cc:
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 PT orpCW'CO
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9302030490 830128 DR ADOCK 05000 7
An Equal Opportunity Employer
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7 ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 BACKFLOW NOT CONSIDERED FOR ERCW BOOSTER PUMP SHUTOFF BLRD-50-438/83-09, BLRD-50-439/83-06 NCR BLN BLP.8233 10 CFR 50.55(e)
FIRST INTERIM REPORT Description of Deficiency During design of the Essential Raw Cooling Water (ERCW) System, consideration was not given to booster pump shutdown and the prevention of backflow. Designers had considered that these pumps would operate continuously and would not require backflow prevention. During loss.of offsite power or during routine maintenance the pumps would shut down thereby resulting in backflow. This deficiency was discovered during the design review process. A check valve should have been placed in the discharge line of the booster pumps to prevent backflow when the pump shuts down.
Interim Progress TVA's Division of Engineering Design has begun revising pipe design drawings and seismic analyses for the addition of a check valve to the discharge of the ERCW booster pumps. This work will be done in accordance with engineering change notice (ECN) 1718.
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