ML20011A726

RO 50-327/81120:on 811016,while re-evaluating Max post- Accident Water Level Inside Containment,Class IE Electrical Components 1-PT-68-68,1 & 2-TE-68-1/24/60/83 & Four Lower Containment Hydrogen Igniters Were Found Potentially Unsafe

ML20011A726
Person / Time
Site:	Sequoyah
Issue date:	10/16/1981
From:	Mason C TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
RO-50-327-81120, NUDOCS 8110290356
Download: ML20011A726 (1)

Text

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TE!ECOPY TO MRC October 16, 1981 2

n U.S. Nuclear Regulatory t h fselon a MS Region II O 2- 2" 101 Marietta Street, NW

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Suite 3100 o >Q Atlanta, Georgia 30303 y yy

- ma SQED-50-327/81120 .. OEi h

Reported under Technical Specification 6.9.1.12.h ca o'

- p .:

Date of Occurrence: 10/16/81 Time of Occurrence 1030 (c)

Technical Specification Inv ~ved: 6.9.1.12.h -

Condi_tions Prior to Occurrence Unit 1 Mode 5 0% Power Unit 2 V. ode 5 0% Power Identification _ _and Description o_f_ Occurr_ence While reevaluating the maximum post accident water level inside containment, the following Class IE electrical components were determined to have a potentially adverse safety impact if they failed because of post accident submergence.

1-PT-68-68, 1&2-TE-68-1/24/60/83, and four (4) lower containment hydrogen ignitors.

W rant Cause of Occurrence The r.aximum post accident water level was inaccurately modeled during initial design. .

REGIONAL DIRECTOR DEPUTY D; RECTOR AS9STANT TO .D: RECTOR Other Related E_ vents 0 9 EC Oh, EC S None. D! RECTOR, ENF/INV DIRECTOR, ETl PUBLIC AFFAIRS OFFICER Corrective Action taken or Pinnned .

1-PT-68-68 is presently being ralocated above the maximum flood level, 162-TE-68-1/24/60/83 have open terminals in the junction boxes which are being spliced and covered with waterpro6f sleeving, and the four (4) hydrogen igniters are being placed on a separate circuit so the remaining igniters will not be effected. These modifications will be completed prior to entry inco Mcde 4. , ,s g 2 Power Plant Superintendent / ( ,

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Sequoyah Nucle.'r Plant , u [ -/ 7 F v ,

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8110290356 811016

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