ML20111B470
| ML20111B470 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 02/22/1985 |
| From: | Hufham J TENNESSEE VALLEY AUTHORITY |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8503130121 | |
| Download: ML20111B470 (2) | |
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e i-TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 37401 400 Chestnut Street Tower II BLRD-50-43 8/83-09 i
BLRD-50-439/83-06 U.S. Nuclear Regulatory Ccemission Region II l
Attn:
Dr. J. Nelson Grace, Regioml Administrator 101 Marietta Street, NW, Suite 2900 i
l Atlanta, Georgia 30323
Dear Dr. Grace:
BELLEFONTE NUCLEAR PLANI UNITS 1 AND 2 - BACKFLOW NOT CONSIDERED FOR ERCW B0OSTER PlHP SHUR 0FF - BLRD-50-438/83-09, BLRD-50-439/83 FOURTH 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.
This was followed by our interim reports dated Janmry 28 and May 6,1983 and July 17, 1984.
Enclosed is our fourth interim report. We expect to sutmit our next report on cr about April 3, 1985.
If you have any questions, please get in totch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY W. H icensin an Regulations Enclosure Office of Inspection and Enforcemen(t Mr. James Taylor, Director (Enclosu o) cc:
U.S. Nuclear Regulatory Ccamission Washington, D.C.
20555 Records Center (Enclosure)
)
Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 j
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i An Equal Opportunity Employer y
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ENCLOSURE BELLEFCNTE NUCLEAR PLANT UNITS 1 AND 2 BACKFLOW NOT CONSIDERED FOR ERCW BOOSTER PlHP SHUT 0FF BLRD-50438/83-09, BLRD-50439/83-06 10 CFR 50.55(e)
NCR BLN BLP 8233 FOURTH 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 has completed the drawing revisions and procurement activities detailed in our previous mport.
TVA will sutrait a final mport on this deficiency upon review and closure of
, the quality assurance doctanentation associated with this deficiency and implementation of the action required to prevent recurrence.
To prevent recurrence of this deficiency, TVA will minstruct designers to consider pump shutdown as an operating mode in preparation of Bellefonte Nuclear Plant (BLN) criteria diagrams.
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