ML20024F307

Interim Deficiency Rept Re Dc Backed Power Supplies for Fogg Interlock Relays in Auxiliary Feedwater Sys.Schematic Diagram E-158(Q) Revised & Issued as of 830727 to Provide 120-volt Ac Power

ML20024F307
Person / Time
Site:	Midland
Issue date:	09/02/1983
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, 23781, 83-04-#2, 83-4-#2, NUDOCS 8309090259
Download: ML20024F307 (6)

Text

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i .. e 9 O Consumers Power u,,, . -

Q& Vice President - Projects, Engineering ll and Construction General officas: 1945 West Parnell Road, Jackson, MI 49201 . (517) 788 0453

. September 2, 1983 83-04 #2 Mr J G Keppler, Regional Administrator US Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND ENERGY CENTER PROJECT -

DOCKET NOS 50-329 AND 50-330 FOGG INTERLOCK RELAYS - AUXILIARY FEEDWATER SYSTEM FILE: 0.4.9.76 SERIAL: 23781

Reference:

J W Cook letter to J G Keppler, same subject (1) Serial 23740, dated July 22, 1983 The referenced letter provided an interim 50.55(c) report concerning DC

. backed power supplies for FOGG interlock relays in the auxiliary feedwater system. This letter is our final report on this subject.

Attachment 1 to this letter provides a detailed discussion of the deficiency and corrective action taken to resolve this matter. Consumers Power will notify the NRC Resident Inspectors' Office when the required wiring changes have-been verified by MPQAD and have been implemented in the field.

JWC/WRB/cd

, Attachment 1: MCAR-68, Final Report, dated August 15, 1983 l

'CC: Document Control Desk, NRC Washington, DC RJCook, NRC Resident Inspector Midland Nuclear Plant 8309090259 030902 PDR ADOCK 05000329 PDR S. _

gyp - u xg OC0883-0023A-MP01 w&]I}

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Serial 23781

.83-04 #2.

1 CC: CBechhoefer, ASLB Panel

_LBernabei, GAP

. FPCowan, ASLB Panel i JHarbour, ASLB Panel-AS&L Appeal Panel i- MMCherry, Esq

'MSinclair BStamiris

. CRStephens, USNRC WDPaton, Esq,'USNRC

_.FJKelley, Esq Attorney General SHFreeman, Esq, Asst Attorney General ,

WHMarshall GJMerritt,'Esq, TNK&J

_INPO.Recor'ds Center ,

i-4 r-h a

i OC0883-0023A-MP01-

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Attachment 1

Subject:

MCAR 68 (icemed 6/24/83)

Iack of DC backed power supplies for the FOGG interlock relays in the eeduster System.

FINAL REFORT Date: August 15, 1983 Project: Consmers Power Company Midland Plant Units 1 and 2 Bechtel Job 7220 INTRODUCTION This report provides the final status and course of corrective action l required pursuant to MCAR 68.

DESCRIPTION OF DEFICIENCY The Midland Plant Units 1 and 2 FSAR, subsection 10.4.9.1.1, safety design basis five, requires the turbine driven AFW pump to be capable of meeting the feedwater requirements for two hours upon loss of all offsite, normal onsite, and emergency onsite AC power (station blackout).

A design review of the Auxiliary Feedwater System, revealed that the FOGG interlock relays (Ref. schematic diagram E-158(Q), Rev 14, Sh 41 and 42) are powered from Class 1E AC supplies that are not DC hacked, and therefore are lost during station blackout. Deenergizing the FOGG relays will cause valves IM03177A&B and 2M03277A&B to shut, cutting off the steam supply to the Auxiliary Feedwater Turbine.

SUM ARY OF INVESTIGATION AND HISTORICAL BACKGROUND This deficiency was discovered during the Midland independent design and construction verification program.

ANALYSIS OF SAFETY IMPLICATIONS A complete loss of AC power would cause inoperability of the steam supply isolation valves and would result in loss of feedwater to the steam generators and the inability to safely cool down the reactor coolant system during a station blackout.

FROBABLE CAUSE Valves IM03177A&B and 2M03277A&B were supplied from Class 1E DC power as required by logic diagram J-234(Q), Rev 5, for operation during station blackout.

When designing the FOGG interlock relay circuits, power supplies equivalent to those require for the above valves should have been used.

The root cause was determined to be a unique instance where the need for l the DC backed power was omitted in the detailed design.

i -.--- -- -

MCAR 68 - Final Report -

Fage 2  ;

I 125524 c0EnECrivE ACrion 125505

, 1. Schematic diagram E-158(Q) and associated connection and panel drawings have been revised and issued as of July 27, 1983, to provide the FOGG interlock relay circuit with Class 1E DC backed 12CV AC power.

2. Engineering has reviewed all safety related systems to ensure that l l interlocks for valves and prime movers requiring Class 1E DC backed l power are supplied from the appropriate power supplies in accordance with the FSAR and system requirements. Enfer to the attached for a i

listing of valves / prime movers reviewed. The review showed that l l

t power supplies to all valve interlocks were in accordance with FSAR and system design requirements.

3. Engineers preparing schematic diagrams in the future have been formally instructed to include in their checklist verification that appropriate power supplies are used in accordance with FSAR and system design requirement for individual components and any required interlocks.

REPORTABILITY Based on the safety implications this deficiency was reported to the NRC l in accordance with Title 10 of the Code of Federal Regulation Part 50.55(e) on June 22, 1983. g Submitted by: .

i J.G. Kovach Electrical Group Supervisor

{

Approved by:

j E.M. Hughes b Froject Engineer Concurrence by- W R.L. Castleberry' S

I' Chief Ele tri al Engineer Concurrence by:

E.H. Smith '

Engineering Manager r

Concurrence b : Ildio&5 1 rM.A.Dietrig Project Quality Assurance i

Engineer JGK/EC/h1 080403

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Attachment:

List of Valves / Prime Movers Reviewed (2 pages) l

) ,, .

Attachaert to MCAR 68 Page 1 of 2 125524125505 LIST OF VALVES / PRIME MOVERS REVIEWED 125V DC VALVES DC PNL i BER I Valve i DWG # Page # Description 1D11 14 1M P3865A E-158(Q) 1 AFW Isolation VLV A 1D21 16 1MO-38658 E-158(Q) 3 AFW Isolation VLV B 1D21 14 IMO-3177A E-158(Q) 24 Sta Gen 1E-51A/B Crosecon 1D21 15 IMO-3177B E-158(Q) 25 Sta Gen 1E-51A/B Crosscon 1D12 15 IIV-3889 E-158(Q) 49 AFW Sys VLV ID11 11 1XV-3111A E-352(Q) 9, 12 MSLIV ID21 11 IIV-3111B E-352(Q) 9, 12 MSLIV 1D21 17 IMO-3831 E-153(Q) 1 AFWPT 1G-05 Trip &

Throttle VLV 1D12 14 ISV-0102 E-223(Q) 2 RC PRE PORV 2D11 11 2XV-3211A E-352(Q) 9, 12 MSLIV 2D11 14 2M03965A E-158(Q) 3 STM GEN 2E-51A AFW Inlet 2D21 11 2XV-3211B E-352(Q) 9, 12 MSLIV ,

2D21 14 2M03277A E-158(Q) 25 STM GEN 2E-51A Outlet to AW 2D21 15 2M03277B E-158(Q) 25 STM GEN 2E-51A Outlet to AFW 2D21 16 2M03965B E-158(Q) 3 STM GEN 2E-51B AFW Inlet 2D12 15 2XV-3989 E-158(Q) 49 AFW SYS VLV j 2D12 14 2SV-0202 E-223(Q) 3 RC PRESS PORV j 2D21 17 2M03931 E-153(Q) 6 AFWPT 2P-05B Trip &

Throttle VLV l

NOTE: No prime movers with interlocks requiring Class 1E DC backed power were found.

l l

- Attachment to MCAR 68 Paga 2 cf 2 125505 l 2 S g b ,,,,,,,,, _ , ,,,,

i AC PNL i BER I Valve # DWG # Pase # Description 1Y11 02 1LV-3875A1 E-158(Q) 54 STM GEN AFW LYL Control Valve 2Y11 02 2LV-3975A1 E-158(Q) 55 STM GEN AFW LYL Control Valve 1Y11 02 1LV-3875A2 E-158(Q) 56 STM GEN AFW LVL Control Valve 2Y11 02 2LV-3975A2 E-158(Q) 57 STM GEN AFW LVL Control Valve 1Y12 02 ILV-3875B1 E-158(Q) 58 STM GEN AFW LVL Control Valve 1Y12 02 ILV-387552 E-158(Q) 59 STM GEN AFW LYL Control Valve 2Y12 02 2LV-3975B2 E-158(Q) 59 STM GEN AFW LVL Control Valve 2Y12 02 2LV-3975B1 E-158(Q) 59 STM GEN APW LVL Control Valve 1Y11 02 IIV-3111A E-352(Q) 1 MSLI Valve 1Y12 02 1XV-3111B E-352(Q) 5 MSL1 Valve 2Y11 02 2XV-3211A E-352(Q) 5 MSLI Valve ~

2Y12 02 2XV-3211B E-352(Q) 5 MSLI Valve 1Y11 02 ISV-1023A E-253(Q) 11 DHRS Dump to Sump '

Valve 1Y11 02 ISV-1023B E-253(Q) 11 DHRS Dump to Sump Valve 1Y12 02 ISV-1023C E-253(Q) 11 DHRS Dump to Sump Valve 1Y12 02 ISV-1023D E-253(Q) 11 DHRS Dump to Sump Valve 2Y11 02 2SV-1123A E-253(Q) 11 DERS Dump to Sump Valve

( 2Y11 02 2SV-11238 E-253(Q) 11 DERS Dump to Susp Valve 2Y12 02 2SV-1123C E-253(Q) 11 D3RS Dump to Sump i Valve 2Y12 02 2SV-1123D E-253(Q) 11 DERS Dump to Sump Valve NOTE: No prime movers with interlocks requiring Class 1E DC backed power were found.

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