ML20212P956
| ML20212P956 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 03/11/1987 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML20212P952 | List: |
| References | |
| NUDOCS 8703160410 | |
| Download: ML20212P956 (2) | |
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6 SEQUOYAH NUCLEAR POWER PLANT, UNITS 1 A 2 SAFETY EVALUATION REPORT FOR EMPLOYEE CONCERN ELEMENT REPORT EN 210.1, " SENSITIVE E0VIPMENT LOCATED IN HARSH ENVIRONMENT" 1.
Subject Category: Engineering (EN200)
Subcategory: EQ Process (EN2I0)
Element: Sensitive Equipment Located In Harsh Environment (EN210.1)
The basis for Element Report EN210.1, Revision 1, dated January 2?, 1927, is Employee Concern IN 85-068-002 which states:
" Sensitive equipment, i.e., instruments and instrument panels are located in a harsh environment. CI stated that the location of this equipment is in the bottom of the reactor and part way up the building. Unit not specified."
This concern was evaluated by TVA as potentially nuclear safety-related and potentially applicable to Sequoyah (generic).
II. Summary of Issue The issue defined by TVA is that certain sensitive equipment, such as instruments and instrument panels, is located in a harsh environment near the lower portion of the reactor.
III. Evaluation TVA personnel determined that the concern is valid in that sensitive equip-ment is located in the areas described. However, it was determined that the concern was known (reference WESTEC/TVA report entitled " Management Review of Environmental Qualification Activities and Documentation for Compliance with 10 CFR 50.49," dated September 25,1985) and appropriate measures were being taken to ensure operability of this equipment in the environmental conditions that exist.
Since the concerned individual (CI) did not identify specific equipment or elaborate as to what specific environmental conditions (normal operating environment or design basis accident environment) were of concern, TVA evaluated the concern relative to safety-related equipment located in harsh environments and covered under 10 CFR 50.49. TVA concluded that the Sequoyah equipment oualification (E0) program, which was developed as a result of the WESTEC/TVA report, is adequate to ensure that safety-related, sensitive equipment located in"the areas described will perform their respective functions in the harsh environments in which they must operate.
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. IV. Conclusions The NRC staff. believes that the TVA investigation of the concern was adequate, and their resolution of the concern as described in Element Report EN 210.1, Revision 1, is acceptable. The NRC has conducted inspections of the Sequoyah EQ progran January 6-17, February 10-14, June 23-27, and December 8-12, 1986, and a final inspection of the proaram is scheduled prier to Unit 2 restart. Althouch deficiencies were found during the inspections, TVA has corrected the deficiarcies or will have them corrected prior to restart. Subject to completion of the Sequoyah EQ program by TVA and certification that Sequoyah is in compli-ance with 10 CFR 50.49, the staff believes that the Seaucyah EQ program will ensure satisfactory resolution of this issue. Allegations which have a potential impact on these conclusions have not yet heen fully evaluated.
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