ML20053A229
| ML20053A229 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 05/14/1982 |
| From: | Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 82-04-#1, 82-4-#1, NUDOCS 8205250110 | |
| Download: ML20053A229 (6) | |
Text
O CORSumBIS Power u
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Vice President - Projects, Engineering and Constructson i
General offices: 1945 West Parnell Road, Jackson, MI 49201 * (517) 78& O453 May 14, 1982 82-Oh #1 Mr J G Keppler, Regional Administrator US Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND PROJECT -
DOCKET NOS 50-329 AND 50-330 i
AUXILIARY FEEDWATER PUMP TURBINE DRIVER STEN 4 ADMISSION VALVE INTERLOCK SYSTEM FILE:
0.h.9.60 SERIAL: 16191 This letter provides a final 50 55(e) report concerning deficiencies in the auxiliary feedvater pump turbine driver steam admission valve interlock system. This was reported to Mr C Williams and Mr R Walker of your staff on 4/1h/82. This letter is a final report in that the corrective action for this problem has been determined and is scheduled to be complete by June 1, 1982.
The attachments to this letter give a complete description of the deficiency and the scheduled corrective action to be taken to r e lve the problem.
i WRB/lr Attachments:
- 1) Management Corrective Action Report MCAR-1, Report No 58, dated April 14, 1982 l-
- 2) MCAR-58, Final Report, dated April 30, 1982 CC:
RJCook, NRC Resident Inspector l
Midland Nuclear Plant l
Document Control Desk, NRC l
'MAY 19 1982, 8205250110 820514 DR ADOCK 05000329 PDR faf,f s
Serial 16191 82-Oh #1 CC:
CBechhoefer, ASLB Panel RSDecker, ASLB Panel FPCowan, ASLB Panel JHarbour, ASLB Panel AS&L Appeal Panel MMCherry, Esq MSinclair BStamiris CRScephens, USNRC WDPaton, Esq, USURC FJKelley, Esq, Attorney General SHFreeman, Esq, Asst Attorney General WilMarshall GJMerritt, Esq, TNK&J Great Lakes QA Managers 1
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QUAUTY ASSURANCE PROGRAM S ri 1 1 191 82-oh #1 MANAGEMENT CORRECTIVE ACTION REPORT MCAR-1 v666 5
58 negonr uo.
g 7220 April 14, 1982 JOB NO.:
O NO.:
DATE:
1 DESCRIPTION * (including References):
FSAR Section 10.4.9 (Rev 37) states, "The auxiliary feedwater system (AFW) is designed to function whenever the main feedwater system is not in operation; i.e., during start-up, shutdown and emergency conditions where feedwater is required. Contrary to the above, the existing design of the AFW pump turbine driver steam admission valve interlock system would block steam from both steam generators to the AFW tur-bine driver and prevent proper operation of the AFW system. The valves affected are:
IMO-3177A, IMO-3177B, 2M0-3277A and 2M0-3277B.
RECOMMENDED ACTION * (Optonal):
1)
Implement a design change to insure proper operation of the AFW system.
2)
Determine root cause of the deficiency and provide corrective action to prevent recurrence.
3)
Based on corrective action 2, above, determine which scheme and logic diagrams need to be reviewed for similar deficiencies.
4)
Issue interim report by April 30, 1982.
REFERRED TO:
E Engineering O Construction O QA Management O
O Procurement ISSUED BY:
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CORRECTIVE ACTION TAKEN:
AUTHORIZED BY:
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AAPo DetTneuTioes PaoJ DesTamuTaose OTNan DesTsueUTioes MGR or construction ewiu coNsTR oc ENoR MGR or oA TPo FORMAL REPORT TO CUENT MoR or E,oNEER=G cuENT oPo.oA MoR (if SectionII Applies)
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- Desenbe vi space previoed and attacti reference document.
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AAPo ooos Section Number Page of t
068432 serial 16191 82-04 #1 068315 Bechtel Associates Professional Corporation
SUBJECT:
MCAR 58 (Issued 4/14/82)
Steam Generator Auxiliary Feedwater Isolation Valves FINAL REPORT DATE:
April 30, 19$2 PROJECT:
Consumers Power Company Midland Plant Units 1 and 2 Bechtel Job 7220 Introduction This report is submitted to provide the final status purs sant to MCAR 58.
Description of Deficiency Based on random discrepancy findings in the schematic and logic diagram for the auxiliary feedwater (AFW) system, a complete review of schematic versus logic diagrams was made for this system by the electrical disci-pline. During this review, it was noted that valves IMO-3177A, IMO-3177B, 2M0-3277A, and 2MO-3277B will not function as intended.
In accordance with FSAR Subsection 10.4.9 (Rev 37), the AFW system is designed to function whenever the main feedwater 3ystem is not operating, i.e., during startup, shutdown, and emergency conditions when AFW is required. During such con-ditions, valves IMO-3177A, IMO-3177B, 2MO-3277A, and 2MO-3277B should be open for admission of steam from steam generator to turbine driver to drive AFN pumps IP-05B and 2P-05B.
Contrary to the abov'e, the existing design of the AFW pump turbine driver steam admission valve interlock system would block steam from both steam generators to the AFW turbine driver and prevent operation of the AFW system.
Probable Cause The cause of this deficiency is considered to be misinterpretation of Logic Diagrams 7220-J-501(Q) and J-299(Q).
Corrective Action The following actions will be taken.
1.
Revise Logic Diagram 7220-J-501(Q) and J-299(Q), Sh 9, to provide clarification of the steam generator AFW isolation valve interlock system.
I l
568432 Bechtel Associates ProfessionalCorporation 0683hjia33 Final Report April 30, 1982 Page 2 2.
Revise Schematic Diagram 7220-E-158, Sheets 24 and 25; Connection List 7220-E-900; and Panel Modification Drawings 7220-J201-69 and 166 to correct feed-only good generator (FOGG) signal interlocks to ensure proper operation of steam generating AFW isolation valves IMO-3177A, IMO-3177B, 2MO-3277A, and 2MO-3277B.
3.
The electrical discipline has already reviewed all Class lE schemes against logic diagrams associated with the AFW.
In addition, ap-proximately 100 out of 600 drawings of Class IE schematics have been reviewed and no further deficiencies were found. This review was conducted by the engineers who were not involved in the original design or checking of the systems.
Safety Implication The steam turbine driven AFW pumps provide the required feedwater to both steam generators of each unit. Valves IMO-3177A, IMO-3177B, 2MO-3277A, and 2MO-3277B are required to open for admission of steam from both steam generators to the AFW pump turbine driver. These valves will be closed in the presence of a F0GG signal. Inoperability of the steam generator feedwater isolation valves would result 'in loss of AFW to the steam generators and the inability to safely cool down the reactor coolant system during this event.
Forecast Dates on Corrective Actions The forecast completion date for the items listed above is June 1, 1982.
Reportability Based on the safety implication, this deficiency is considered report-able under the criteria contained in 10 CFR 50.55(e).
l 068432 Bechtel Associates ProfessionalCorporation 668315 MCAR 58 Final Report April 30, 1982 Page 3 ll Submitte y:
my J.G. Kovach s
Electrical Group Supervisor b
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Approved by:
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Curtis roject Engineering Manager
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,e M41 P (ISe/h Concurrence by:,
1.H. Smith /
4 4y' verie/ au /4ce< Nj Engineering Manager
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- M.A. Dietrich
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Project Quality Assurance Engineer i
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