ML20054B548

Interim Deficiency Rept Re Assignment of Auxiliary Feedwater Level Control Valves Power Supplies,Initially Reported on 820309.Schematic Diagram Will Be Revised.Next Rept Expected by 820601

ML20054B548
Person / Time
Site:	Midland
Issue date:	04/08/1982
From:	Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
REF-PT21-82-609-000 10CFR-050.55E, 10CFR-50.55E, 16159, 82-03-#1, 82-3, 82-3-#1, PT21-82-609, NUDOCS 8204160587
Download: ML20054B548 (7)

Text

l Consumers Power James W Cook Vice PressJent - Projects, Engineering and Construction 82-03 #1 General of fices. 1945 West Parnali Road, Jackson, MI 49201 * (517) 788 0453 April 8, 1982 d

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Mr J G Keppler, Regional Administrator 9

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US Nuclear Regulatory Commission Z

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P32 Glen Ellyn, IL 60137 s

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MIDLAND PROJECT -

DOCKET NOS 50-329 AND 50-330 AUXILIARY FEEDWATER LEVEL CONTROL VALVES POWER SUPPLIES FILE:

0.h.9 59 SERIAL:

16159 This letter provides an interim 50 55(e) report concerning deficiencies in the assicreent of power supplies for the auxiliary feedwater level control valves. This was reported to Mr D C Boyd of your staff on March 9,1982.

The attachments to this letter provide a description of the deficiency and the actions being taken to correct the situation.

Another report, either interin or final, will be sent on or before June 1, 1982.

WEB /1r Attachments:

(1) Bechtel Management Corrective Action Report MCAR-1, Report No 57, dated March 17, 1982 (2) Bechtel MCAR-57, Interim Report 1, dated April 1,1982 CC:

Document Control Desk, NRC Washinf%on, DC RJCook, NRC Resident Inspector Midland Nuclear Plant hb 8204160587 820408 5

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Serial 16159 82-03 #1 CC: CBechhoefer, ASLB Panel RSDecker, ASLB Panel FPCowan, ASLB Panel JHarbour, ASLB Panel AS&L Appeal Panel MMCherry, Esq MSinclair BStamiris CRStephens, USNRC WDPaton, Esq, USNRC FJKelley, Esq, Attorney General SHFreeman, Esq, Asst Attorney General WHMarshall GJMerritt, Esq, TNK&J Great Lakes QA Managers

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Attach:nent 1

, ennn-OUALITY ASSURANCE PROGRAM serial 16159 uucau4 MANAGEMENT CORRECTIVE ACTION REPORT 82-03 #1 MCAR-1 REPORT NO.:

57 JOB NO.-

7220 O N O.:

DATE: March 17, 1982 1 DESCRIPTION * (inc'uding References):

FSAR section 7.4.1.1.3.2 states: power for the auxiliary feedwater (AFW) level control valves is from Class lE 120 V ac preferred power supplies. Contrary to the above, Drawing E-158 Sh. 57 shows that the power supplies for the AFW level control valves (lLV-3875A1, ILV-3875A2, ILV-3875B1, ILV-3875B2, 2LV-3975A1, 2LV-3975A2, 2LV-3975B1 and 2LV-3975B2) are fed from Class 1E 120 V ac instrument control power.

Reference SCRE 45.

RECOMMENDED ACTION * (Optional):

1)

Revise and issue design change as required to the affected drawing and schedule.

2)

Engineering to determine root cause of deficiencies and take appropriate corrective action to preclude recurrence.

3)

Issue interim report by March 31, 1982.

REFERRED TO:

% Engineering O Construction O OA Managernent 0

O Procurement ISSUED BY:

7'M-82.

Protect OA Eng nee' Date Note: This deficiency was reported to the NRC by the client as potentially reportable on March 9, 1982.l 7

11 REPORTABLE DEFICIENCY:

l NOTIFIED IENT: 8/// M O NO X]YES 8

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Ill CAUSE:

CORRECTIVE ACTION TAKEN:

AUTHORIZED BY:

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Bechtel Associates Professional Corporatiorve3 n

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SUBJECT:

MCAR 57 (issued 3/17/82)

Auxiliary Feedwater Level Control Valves Power Supplies INTERIM REPORT 1 DATE:

April 1, 1982 PROJECT:

Consumers Power Company Midland Plant Units I and 2 Bechtel Job 7220

REFERENCE:

Safety Concern and Reportability Evaluation 45, 3/8/82 Introduction y

This report provides the interim status and course of action required pursuant to MCAR 57.

Description of Deficiency Deficiency, Part 1 e

During system review by the Consumers Power Company testing group, it was discovered that the power supplies for the following auxiliary dl feedwater (AFW) level control valves are not scheduled from the Class IE 120 V ac preferred (battery-backed) power systems, as required by the Final Safety Analysis Report (FSAR) Subsection 7.4.1.1.3.2:

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ILV-3875B1 2LV-3975B1 ILV-3875B2 2LV-3975B2 The power supplies currently assigned are from Class 1E instrument

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and control (nonbattery-backed) power supplies.

Deficiency, Part 2 f

Further evaluation by Bechtel engineering identified the following valves with the same deficiency:

1LV-3875A1 2LV-3975A1 ILV-3875A2 2LV-3975A2 l

Probable Cause I

The cause of this deficiency is considered to be an isolated case of f

i incorrect assignment of power at the 120 V ac level.

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7 Bechtel Associates Professional Corporation U64856 MCAR 57

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Interim Report 1 April 1, 1982 Page 2 The requirement for supplying 120 V ac preferred (battery-backed) power for a motoroperated valve is unique. Valves, motors, and other inductive loads do not normally require constant and continuous power supply and therefore are powered from nonbattery-backed power supplies. This application was a special case to meet operational requirements under station blackout conditions. This special requirement was missed when the schematic diagram was developed.

Corrective Action The following actions will be taken.

1.

Revise Schematic Diagram 7220-E-158(Q) and 120 V ac Panel Sched-ules 7220-E-31(Q) and 7220-E-32(Q) to feed all AFW 1evel control valves from Class 1E 120 V ac preferred (battery-backed) power.

2.

The electrical discipline will review the FSAR to v'erify that all commitments to feed components and/or systems from any of the 120 V ac preferred (battery-backed) power systems are met.

The electrical discipline will document the rerults of this review.

Safety Implication Deficiency, Part 1 During station blackout, the steam turbine-driven AFW pumps provide the required feedwater to both steam generators of each unit.

Valves 1LV-3875B1, ILV-3875B2, 2LV-3975B1, and 2LV-3975B2 are required to control and maintain a constant steam generator water level. These valves would fail in the closed position and be inoperable upon loss of the nonbattery-backed 120 V ac power sup-plies to the valves. Inoperability of the level control valves would result in loss of feedwater to the steam generators and the f

inability to safely cool down the reactor coolant system during thic event.

Deficiency, Part 2 Valves lLV-3875A1, ILV-3875A2, 2LV-3975A1, and 2LV-3975A2 are not required for station blackout operation. These valves are required only when providing auxiliary feedwater via the motor-driven AFW pump of each unit.

When ac power is available for operation of the motor-driven AFW pump of each unit, power will also be available for operation of the associated level control valves.

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Bechtel Associates Professional Corporation 064836 MCAR 57 Interim Report 1

, April 1, 1982

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The FSAR Subsection 7.4.1.1.3.2 commitment to feed valves ILV-4 3875A1, IVL-3875A2, 2LV-3975A1, and 2LV-3975A2 from 120 V ac pre-ferred (battery-backed) power sources was made because the valves did not meet an FSAR Subsection 8.3.1.1.8 commitment for motor-operated valves to be capable of operating at 80% voltage. The valves have a minimum voltage tolerance of 85% and were assigned to 120 V ac preferred power to ensure that the valves were fed from a power supply which would not drop below 85% voltage. Subsequent f

voltage studies have verified that the existing power supply con-E figuration from instrument and control power (nonbattery-backed)

[j would not be expected to result in voltage of 85% or less at the

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valve terminals.

There would be no safety implication associated with Part 2 of this deficiency because the existing power supplies to the valles would be available when requried and would have sufficient voltage to operate the valves.

D Forecast Dates on Corrective Actions The forecast completion date for the items listed above is April 30, 1982.

Reportability Based on the safety implication, Part 1 of this deficiency is considered reportable in accordance with Title 10 of the Code of Federal Regulations, Part 50.55(e).

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Submitted by:

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Approved by:

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Curtis Project Engineering Manager l

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P Bechtel Associates ProfessionalCorporation 064856 MCAR 57 Interim Report 1 April 1, 1982 Page 4

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Concurrence by:

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E.H. Smith Engineering Manager M.A. Dietrich Project Quality Assur-ance Engineer

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