United States Nuclear Regulatory Commission - Protecting People and the Environment

ACCESSION #: 9610160080

TVA

Tennessee Valley Authority, Post Office Box 2000, 
Hollywood, Alabama 35752

September 20, 1996

U. S.  Nuclear Regulatory Commission              10 CFR 50.55(e)     
ATTN: Document Control Desk   
Washington, DC 20555

Gentlemen:

In the Matter of the Application of)         Docket Nos. 50-438  
Tennessee Valley Authority         )                     50-439

BELLEFONTE NUCLEAR PLANT (BLN) UNITS 1 AND 2 - POTENTIAL                  
DEFECT OF STARTING AIR ADMISSION VALVES - PROBLEM                         
EVALUATION REPORT (PER) BLP960034 - BLRD-50-438/96-01 / BLRD50-           
439/96-01

The subject deficiency is determined reportable in accordance with 10 CFR
50.55 (e) and is documented in Problem Evaluation Report (PER) BLP960034. 
Enclosed is TVA's interim report on the subject.

Should there by any questions regarding this matter, please telephone J. 
E.  Blackburn, Acting Nuclear Assurance & Licensing Manager at (205) 574-
8058.

Sincerely,


N.  C. Kazanas
General Manager

Enclosure 
cc:  See page 2


U. S.  Nuclear Regulatory Commission 
Page 2 
September 20, 1996

cc (Enclosure): 
     Mr.  P.  E.  Fredrickson 
     U.  S.  Nuclear Regulatory Commission 
     Region II 
     101 Marietta Street, NW, Suite 2900 
     Atlanta, Georgia 30323

     Mr.  M.  C.  Thadani, Project Manager 
     U.  S.  Nuclear Regulatory Commission 
     One White Flint, North 
     11555 Rockville Pike 
     Rockville, Maryland 20852


ENCLOSURE 1

BELLEFONTE NUCLEAR PLANT (BLN) - UNITS 1 AND 2 
POTENTIAL DEFECT OF STARTING AIR ADMISSION VALVES 
PROBLEM EVALUATION REPORT (PER) BLP960034 
BLRD-50-438/96-01 AND BLRD-50-439/96-01

INTERIM REPORT

Description of Deficiency

The potential defect concerns the Emergency Diesel Generator(s) starting
air admission valves as identified by Cooper Energy Services under 10 CFR
21 and the NRC Event Number 30728.  A total of sixteen (16) valves are
affected at the TVA Bellefonte Nuclear Plant by this notification.  A
malfunction of the starting air admission valves upon receipt of a start
signal could prevent availability of the essential Emergency Diesel
Generator(s) (EDG).

Safety Implications

The failure of the valves to fully open could potentially prevent of the
EDG(s) from starting.  Such a failure could create a substantial safety
hazard due to a major reduction in the availability of plant safety
systems.

Interim Progress

TVA will conduct an evaluation of the vendors recommended corrective
action and determine appropriate corrective action.  A final report
concerning final disposition of the reported potential defect will be
provided no later than six months prior to initial fuel loading.


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