ML20080L896

Telecopy Ro:On 830919,Surveillance 4.7.A.2.G3 Determined Leakage Rates Exceeded for MSIV Lines A,C & D.Caused by Leakage Past Main Valve Seat.Seating Surfaces Modified

ML20080L896
Person / Time
Site:	Browns Ferry
Issue date:	09/20/1983
From:	Jones G TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NUDOCS 8310030376
Download: ML20080L896 (1)

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14 2 830920 900 xna NUC PR ARMS, 1520 CST 2-C E. A. Belvin, MPB-MS (If TELECOPY TO NRC U3y;q' radioactive material release Sep. 20, 1983 4 TI / . t7 0. ,Campb,ll,e T. L. Chinn, BFNP 1760 CST 2-C J. F.' D64 /W11B85C-K C. W. Crawford, 670 CST 2-C U. S. Nuclear Regulatory Commission Oj' gb0 23 P.4qyqc, W11C127C-K Region II S. 061d , E124AC-K 101 Marietta Street, NW G. R. Hall, 6204 MIB-K Suite 3100 Receptionist, Plt Supt Office Atlanta, Georgia 30303 R. L. Lumpkin, Jr., 401 UBB-C L. M. Mills, 400 CST 2-0 BFRO-50-296/ 83054 ' G. Paulk, NRC Shif t Engineer Reported under Technical Specification 6.7 2.a.(2) F. A. Szczepanski, 220 401B-(

W. C. Thomison, BFN Telecoov Date 9/19/83 Time 1500 Date of occurrence: 9/19/ 83 Time of Occurrence: 0700 Unit 3 Technical Specification Involved: 4.7. A.2.1 and .7. A.2.g Conditions Prior to Occurrence Unit 1 - Refueling Outage Unit 2 - 680 MWe Unit 3 - Cold Shutdown Identification and Descriotion of Occurrence Performance of Surveillance Instruction 4.7.A.2.g-3 revealed that the leakage rates for each "A", "C", and "D" line MSIV's were a total of 2615 5 SCFH, 37.6 SCFH, and 2652 7 SCFH, respectively. Using conservative assumptions, the leak rate applicable to each valve is 1307.8 SCFH for "A" line MSIV's,18.8 SCFH for "C" line MSIV's, and 1326.4 SCFH for "D" line MSIV's. This causes the total type B and C tests to exceed 60% La or 655 9 SCFH (Technical Specification 4.7. A.2.g) for "A" and "D" line HSIV's and causes the technical specification limit of 11.5 SCFH (Technical Specification 4.7. A.2.1) to be exceeded on these three MSIV lines.

Aeoarent Cause of Occurrence :

line MSIV's and packing Leakage past the main valve seat on the "A" and "D" and seat leakage on "C" line MSIV's.

Other Related Events :

BFRO-50-259/77023, 78024, 80003, 81014, 83020 BFRO-50-260/79007, 80042, 82032, 82037 BFRO-50-296/78025, 79014, 80058, 80059, 81073 o$a.

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$ Corrective Action Taken or Planned :

00 0 Corrective maintenance to valve seating surfaces along with long-term k modifications on MSIV's.

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