ML20236U295
| ML20236U295 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 11/25/1987 |
| From: | Gridley R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| TAC-51203, TAC-51204, NUDOCS 8712020419 | |
| Download: ML20236U295 (5) | |
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TENNESSEE VALLEY AUTHORITY '
"I CH ATTANOOGA. TENNESSEE 37401 f
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.5N 1578 Lookout Place-1 NOV 251987 U.S. Nuclear Regulatory Commission ATTN:
Document Control Desk
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i Washington,.D.C.
20555 Gentlemen:
In the. Matter of'
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Docket Nos. 50-327, Tennessee Valley Authority
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.50-328:
SEQUOYAH NUCLEAR PLANT (SQN) - DETAILED CONTROL ROOM DESIGN REVIEW (DCRDR)'
i SUPPLEMENT TO
SUMMARY
REPORT
Reference:
Letter from J. A. Zwolinski to S. A. WhiteLdated' August 27, 1987, l.
" Safety Evaluation for the Detailed Control Room Design Review (DCRDR) (TAC 51203, 51204)"
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.The NRC safety evaluation of the DCRDR required TVA to submit additional information concerning DCRDR-related modifications and schedule commitments. lists the individual human engineering deficiencies;(HEDs). In question and.the DCRDR actions for them.
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1 l is the revised schedule for modification implementation.. The-schedule shows panels being worked as.a group.
This grouping pulls forward and corrects the lower category 2 and 3 HEDs for these panels.in accordance-with the commitment made to correct lower prior.ity HEDs during refueling cycles 4 and.5.
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An area needing clarification is section 2.7 of the safety evaluation report, l
which indicates that TVA will verify proposed design' modifications.by a formal review and approval. process equivalent to the assessment and categorization methodology'.
As stated in section 2.7 of the technical evaluation report','TVA has already done this and does not intend to repeat the process, i
i If you have any questions, please telephone M. R. Harding at (615) 870-642'2.
'l Very truly yours, TENNESSE VALLEY AUTHORITY-i
-l R. Gridle, Director Nuclear Licensing and Regulatory Affairs l
Enclosures, cc:
see.page.2
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8712O2041987%hh
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- DR-ADOCK 05 PD(
An Equal Opportunity Employer :
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. U.S. Nuclear Regulatory Commission NOV 251987 li cc (Enclosures):
Mr. G. G. Zech, Assistant Director for Inspection Programs Office of Special Projects U.S. Nuclear Regulatory Commission 101 Marietta Street, NH, Suite 2900 Atlanta, Georgia 30323 Mr. J. A. Zwolinski, Assistant Director for Projects Division of TVA Projects Office of Special Projects j
U.S. Nuclear Regulatory Commission j
43S0 East-West Highway EWH 322 Bethesda, Maryland 20814 Sequoyah Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road l
Soddy Daisy, Tennessee 37379 1
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i ENCLOSURE 1 Listed below are the. human engineering deficiencies.(HEDs) in question and'the detailed control room design review (DCRDR) actions for them.
HED 0379'
' Absent main steam line radiation monitors are needed.
-E This is a Regulatory Guide 1.97 item to be installed on panel.M4 during cycle 4 refueling outage.
DCRDR is coordinating this' effort to accomplish installation during cycle 4 rework of panel-M4 (see enclosure 2 schedule).
HED 1098 Control room emergency lighting levels are below the recommended 1
HED.1099 level, and. normal lighting. levels on 1-M-9 and'l-M-10 do not meet rinimum (20 foot-candle) lighting requirements.
The attached schedule shows-lighting-related problems being corrected by unit 2 refueling cycle 4' completion.
HED 3015 There are many alarms that require the operator to send for 1'
information from outside the control room.for determining required corrective action.
NRC requested the study for the annunciator system to be prioritized to verify that no category 1 HEDs exist within this-problem.
Consistent.with the. original schedule submittal to the NRC,-all category 1 HEDs will be corrected by completion of-refueling cycle 4 outage.
Studies have been prioritized to identify category 1 HEDs in sufficient time to correct them before refueling cycle 4 completion.
SCHEDULE TVA committed to correct lower priority category.2 and 3 HEDs during refueling outages 4 and 5.
TVA also committed to submit a revised schedule for modification implementation to NRC reflecting this commitment after it had been approved by management.
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o ENCLOSURE 3 List of Commitments 1.
All category 1 human engineering deficiencies (HEDs) will be corrected by completion of refueling cycle 4.
2.
Category 2 and 3 HEDs will be corrected during refueling outages 4 and 5.
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