ML20214V615

Rev 0 to TVA Employee Concerns Task Group,Other Sites:High Failure Rate for Auxiliary Feedwater (AFW) Sys

ML20214V615
Person / Time
Site:	Sequoyah
Issue date:	10/07/1986
From:	Birchell R, Debbage A, Knightly J TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20214T770	List: ML20214T769 ML20214T773 ML20214U886 ML20214U902 ML20214U929 ML20214U950 ML20214V344 ML20214V377 ML20214V398 ML20214V421 ML20214V447 ML20214V506 ML20214V523 ML20214V546 ML20214V593 ML20214V615 ML20214V628 ML20214V649 ML20214V673 ML20214V686 ML20214V705 ML20214V728 ML20214V767 ML20214V774 ML20214V800
References
SWEC-SQN-43, SWEC-SQN-43-R, SWEC-SQN-43-R00, NUDOCS 8612090760
Download: ML20214V615 (4)

Text

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TENNESSEE VALLEY AUTHORITY WATTS DAR NUCLEAR PLANT EMPLOYEE CONCERNS TASK GROUP OTHER SITES CEG Element

Title:

High Failure Rate For Auxiliary Feedwater (AFW) System SWEC Concerns: A02050930016-001 Source Document: 1985 INPO Evaluation of Sequoyah Nuclear Plant.

Report Number: SWEC-SQN-43 Evaluator: ~

/8 R. C. Birchell 'Date Reviewed Dy: C/

/d!? b J. J. Knightly Date Approved By: Mu /Ob h[,_

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4 Report SWEC-SQN-43 High Failure Rate for Auxiliary Feedwater System I. INTRODUCTION

,. In the 1985 evaluation (reference A) for the Sequoyah Nuclear Plant, the Institute for Nuclear Power Operations (INPO) identified a finding concerning recurring equipment failures in the auxiliary feedwater system (AFW). This issue was addressed in the Stone & Webster Engineering Corporation (SWEC) systematic analysis, as follows:

A02850930016-001, High Failure Rate for Auxiliary Feedwater System Information on the background, corrective actions taken, verification methodology, verification analysis, completion status, and pertinent reference for this issue is included in this report.

II. VERIFICATION OF SWEC ISSUES A. Background The 1985 INPO evaluation identified the following finding and recommendation for SQN:

(1) Finding (OE.2-1) Corrective actions have not been successful in eliminating all recurring equipment failures in the auxiliary feedwater system.

(2) Recommendation Evaluate maintenance and operating history records to identify causes of recurring equipment failures. Implement corrective action to improve component reliability.

. B. Corrective Actions Taken The TVA response (reference B) to the finding and recommendation stated:

A task team has been formed to evaluate the auxiliary feedwater system. The team evaluation will include the review of potentially reportable occurrences, Licensee Event Reports, maintenance and operating history records, applicable Nuclear Experience Review reports, etc. Based on this evaluation, the team will make recommendations for

[ corrective actions to improve the AFW system's reliability.

l The task team evaluation was completed and the results and recommendations were forwarded to INPO in January 1986 (Reference B). The evaluation resulted in the following INPO commitments:

Page 1 of 2 i

I J

DESCRIPTION DATE i Implement twenty-four (24) short-term actions July 1986 identified by the AFW Task Team for system reliability improvement, with emphasis on level control valve and turbine-driven pump components.

Complete design studies to analyze and propose AFW December 1986 system modifications to improve overall system l reliability. l Compare actual system improvement with established July 1989 goals after two full cycles of each unit.

C. Verification Methodology The SWEC concern identified for Employee Concerns Task Group (ECTG) verification was stated as follows:

RIMS # ISSUE RIMS ITEM A02850930016 High failure rate for the RIMS-001 AFW system.

ECTG reviewed the Sequoyah Compliance Licensing files for internal and external correspondence related to this issue. This formed the basis for this verification activity.

D. Verification Analysis The ECTG review indicated that appropriate corrective actions have been identified. To date 19 of the 24 short term actions identified by the task team have been completed. The remaining 5 items are in progress and the completion date has been extended to January 31, 1987. The two long term issues identified in section II.B are~not due for , completion until December 1986 and July, 1989.

v E. Completion Status

(

Based upon SQN's identified corrective actions, no additional action is required on this item. This SWEC concern can be clos- following completion of actions which are now in progress.

III. References A. 1985 INPO Evaluation of Sequoyah Nuclear Plant, April 1985.

B. TVA Memorandum, "SQN Nuclear Plant Auxiliary Feedwater Reliability Task Team Report and INPO Commitments," dated January 1986, S. A. White to W. Subalusky Page 2 of 2

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4 TVA EMPLOYEE CONCERNS REPORT NUMBER: SWEC-SQN-43 f SPECIAL PROGRAM ,

REPORT TYPE: Sequoyah Nuclear Plant Element REVISION NUMBER: 0 TITLE: High Failure Rate for Auxiliary Feedwater System i

REASON FOR REVISION: N/A SWEC

SUMMARY

' STATEMENT: The item in this report was identified by the Institute l of Nuclear Power Operations (INPO) and was included in the Stone & Webster Engineering Corporation (SWEC)' systematic analysis. The item evaluated within this report was verified to be adequately addressed. Corrective action is in progress.

d PREPARATION PREPARED BY:

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• lhl$$$1 N/A ECSP MANAGER DATE MANAGER CI' NUCLEAR POWER DATE CONCURRENCE (FINAL REPORT ONLY)

• SRP Secretary's signature denotes SRP concurrences are in files.

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