ML20058C809
| ML20058C809 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 07/14/1982 |
| From: | Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 07545, 10CFR-050.55E, 10CFR-50.55E, 7545, 82-03-#3, 82-3-#3, MCAR-57, NUDOCS 8207260450 | |
| Download: ML20058C809 (11) | |
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O Consumers Power Jarnes W Cook Vice President - Projects, Engineering and Construction General offices: 1945 West Parnell Road, Jackson, MI 49201 * (517) 788-0453 July 14, 1982 82-03 #3 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 AUXILIARY FEEDWATER LEVEL CONTROL VALVES POWER SUPPLIES FILE:
0.4.9.59 SERIAL:
17,545
References:
J W Cook letters to J G Keppler, Sr.me
Subject:
Serial 16159, dated April 8, 1982 Serial 17501, dated June 1, 1982 The referenced letters were interim 50.55(e) reports concerning deficiencies in the assignment of power supplies for the au::iliary feedwater level control valves. This letter is our final report on this subject. Attachments 1 and 2 provide a description of the deficiency and the corrective actions which have been taken in response to this item.
WRB/lr CC Document Control Desk, NRC Washington, DC RJCook, NRC Resident Inspector Midland Nuclear Plant 8207260450 820714 PDR ADOCK 05000329 S
PDR JUL Y 9 f$gg OC0782-0005A-MP01 db$
Serial 17545 2
82-03 #3 CC CBechhoefer, ASLB Panel RSDecker, ASLB Panel 6
FPCowan, ASLB Panel Jllarbour, ASLB Panel AS&L Appeal Panel MMCherry, Esq MSinclair BStamiris CRStephens, USNRC WDPaton, Esq. USNRC FJKelley, Esq, Attorney General SilFreeman, Esq. Asst Attorney General WlIMarshall GJMerritt, Esq, TNK&J t
r 074387 Atta hnent ]
Serial 175M Bechtel Associates Professional Corporatiod - 3 #3 j
07426
SUBJECT:
MCAR 57 (issued 3/17/82)
Auxiliary Feedwater Level Control Valves Power. Supplies
~-
+
FINAL REPORT e'
DATE:
June 16, 1982 e
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PROJECT:
Consumers Power Company 111dland Plant Units 1 and 2 Bechtel Job 7220
REFERENCE:
Safety Concern and Reportability Evaluation 45, 3/8/82 Introduction This report provides the final status.3' nd course of action pursuant to !! CAR 57.
Description of Deficiency Deficiency, Part 1
'r During system review by thal Consumers Power Company testing group, it was discoveren' that t,he power supplies for ths following auxi-liary feedwater (AFW) level control valves were not scheduled from the Class 1E 120 V ac preferred (battery-backed) power systems, as required by Final Safety Analysis Report (FSAR) Subsec-tion 7.4.1.1.3.7:
s' ILV-3875B1 2LV-3975B1 ILV-3875B2 2LV-3975B2 The power supplies assigned ere from Class 1E instrument and control (nonbattery-backed) power supplies.
Deficiency, Part 2 Further evaluation by Bechtel engineering identified the following valves with the same deficiency:
ILV-3875A1
- 2LV-3975A1 ILV-3875A2 2LV-3975A2 Probable Cause The cause of this deficiency is considered to be an isolated case of incorrect assignment of power at the 120 V ac level.
Bechtel Associates ProfessionalCorporation 074387 o74269 MCAR 57 Final Report June 16, 1982 Page 2 The requirement for supplying 120 V ac preferred (battery-backed) power for a motor-operated valve is unique.
Valves, motors, and other induc-tive loads do not normally require constant and continuous power supply and therefore are powered from nonbattery-backed supplies.
This appli-cation 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 have been taken.
1.
Schematic Diagram 7220-E-158(Q) and 120 V ac Panel Schedules 7220-E-31(Q) and 7220-E-32(Q) were revised to feed all AFW level control valves from Class 1E 120 V ac preferred (battery-backed) power
(
Reference:
DCN 15 to Drawing 7220-E-158(Q); DCN 14 to Drawings 7220-E-31(Q) and 7220-E-32(Q), Revision 16).
2.
Project engineering reviewed the FSAR to verify that all commit-ments to feed components and/or systems from any of the Class lE and non-Class lE 120 V ac preferred (battery-backed) power systems were met.
The results of the review are presented in the attach-ment to this report.
Three anomalies were noted in performing the review and they are evaluated as follows.
a.
Core Flood Tank (CFT) Vent Valves Position Indication - FSAR Volume 13, Page 7.1-16 states that indicating light power is supplied from 120 V ac preferred control power.
It has been determined that the indicating lights are not powered from 120 V ac preferred power.
Af ter evaluation, it was determined that the existing non-Class lE instrument and control power supplies to the indication are acceptable because redundant indication is provided by CFT pressure and level indication in the control room.
FSAR Change Notice 3389 includes a revision to this FSAR section.
t.
Core Flood Tank Vent Valves - FSAR Volume 13, Page 7.4-14a states that power for the CFT vent valves is provided by Class lE 120 V ac preferred power.
It has been determined tha t the valves are not powered from Class 1E 120 V ac pre-ferred power but from Class 1E control and instrument power.
Af ter evaluation, it was determined that the existing Class lE instrument and control power supplies (diesel-backed) are acceptable because they meet single failure criteria. FSAR Change Notice 3389 includes a revision to this FSAR section.
O74387 Bechtel Associates ProfessionalCorporation 074269 MCAR 57 Final Report June 16, 1982 Page 3 c.
Power-Operated Relief Valve (PORV) - FSAR Volume 13, Page 7.6-9 states that the only supporting system for the power-operated relief valve (PORV) is a Class 1E battery-backed preferred power source.
It has been determined that the PORVs operate on 125 V de and are fed from the Class 1E 125 V de systems.
For low voltage power systems, the tenn " preferred" applies only to battery-backed 120 V ac powcr and is therefore not applicable to the 125 V de supplies to the PORVs.
FSAR Change Notice 3389 includes a revision to this section which corrects the terminology to state that the only supporting system for the PORVs are the Class lE 125 V de systems.
As noted in the attachment to this report all FSAR commitments to feed components and/or systems from any Class lE or non-Class lE 120 V ce preferred (battery-backed) systems were met except as evaluated above.
Safety Implication Deficiency, Part 1 During. station blackout, the steam turbine-drive AFW pumps provide the required feedwater to both steam generators of each unit.
Valves lLV-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 supplies to the valven.
Inoperability of the level control valves would result in loss of feedwater to the steam generators and the inability to safely cool down the reactor coolant system during this 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.
The FSAR Subsection 7.4.1.1.3.2 commitment to feed valves ILV-3875A1, ILV-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-
Bechtel Associates Professional Corporation 074387
.074269 MCAR 57 Final Report June 16, 1982 Page 4 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 voltage studies have verified that the existing power supply con-figuration from instrument and control power (nonbattery-backed) would not be expected to result in voltage of 85% or less at the valve terminals.
There would be no safety implication associated with Part 2 of this def,1ciency because the existing power supplies to the valves would be'available when required and would have sufficient voltage to operate the valves.
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).
Attachment:
FSAR 120 V ac Preferred Power Review Submitted by:
K ' b b' J.G. Kovach' c
[^
7 Electrical Group Supervisor e
Approved by:
M C J_,
e g.M Hughes
/
Project Engineer Concurrence by:
L<-
E.H. Smith Engineering Manager Concurrence by:
M8 M.A. Dietrich Project Quality Assurance Engineer
)
Attcchm:nt to MCAR 57, Fin 1 Report 074387 P:g2 1 f2 e
l FSAR 120 V ac PREFERRED POWER REVIEW System / Equipment Required on 120 V ac 120 V ac (Class lE or Non-Class lE)
Preferred Volume Page Preferre'd Power System Source Refe rence 1
No requirements 2
No requirements 3
No requirements 4
No requirements 5
3.1-27 Reactor protection system (RPS)
Yes E-31, E-32 5
3.1-27 Anticipatory reactor trip system (ARTS)
Yes E-31, E-32 5
3.1-27 Engineered safety features actuation system Yes E-31,.E-32 (ESFAS) analog channels 6
No requirements 7
No requirements 8
No requirements 9
No requirements 10 No requirements 11 No requirements 12 No requirements 13 7.1-14 Core flood tank isolation valves limit Yes E-254 switch position indication (IMO-1001A, B and 2MO-1101A, B) 13 7.1-16 Core flood tank (CFT) outlet valve position Yes E-254 indication (1M0-1001A, B and 2H0-1101A, B) 13 7.1-16 Decay heat removal (DHR) cooler bypass Yes E-250 valve position indication (IMO-1014A, B and 2MO-ll14A, B) 13 7.1-16 Low pressure injection (LPI) block valves Yes E-252 position indication (IMO-1020A, B and 2M0-1120A, B) 13 7.1-16 Core flood tank vent valves position No*
E-254 indication (ISV-1005A, B and 2SV-1105A, B) 13 7.2-4 RPS (See 3.1-27 above) 13 7.1-16 CFT pressure indication (lPI-1004A1, A2, Yes E-369, B1, B2 and 2PI-1104A1, A2, B1, B2)
E-31, E-32 13 7.1-16 CFT level indication (lLI-1003A1, A2, B1, Yes E-369, B2 and 2LI-1103A1, A2, B1, B2)
E-31, E-32 13 7.2-13 ARTS (See 3.1-27 above) 13 7.3-6 Emergency core cooling actuation system Yes E-31, E-32 (ECCAS) 13 7.3-21 ESFAS sensor channels (See 3.1-27 above) 13 7.3-29 Auxiliary feedwater (AFW) level control Yes DCN 15 to valves E-158 13 7.4-9 AFW level control valves (See 7.3-29 above) 13 7.4-14a CFT vent valves (ISV-1067A1, A2, B1, B2 No*
E-254 and 2SV-ll67 A1, A2, B1, B2) 13 7.5-7 ESFAS actuation parameters indication Yes E-31, E-32
Attschmsnt to MCAR 57, Finni Report
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PIgn 2 of 2 074269 u74387 System / Equipment Required on 120 v ac 120 V ac (Class IE or Non-Class 1E)
Preferred Volume Page Preferred Power System Source Reference 13 7.6-9 Power-operated relief, valve (PORV) (ISV-0102, No*
E-223 2SV-0202) 13 7.6-11**
PORV block valve associated instruments Yes E-31, E-32, E-223 13 7A-1 CRDCS trip breaker undervoltage coil Yes E-378 14 8.3-17 ESFAS (See 3.1-27 above) 14 8.3-17 NI/RPS (See 3.1-27 above) 14 8.3-17 ECCAS (See 7.3-6 above) 14 8.3-17 Reactor coolant pump power monitor Yes E-31, E-32 system instrumentation 14 8.3-19 Computer Yes IDCN 1545 15 No requirements 16 9.5-1 Communication systems Yes E-31, E-32 16 9.5-6 Communication systems (See 9.5-1 above) 17 No requirements 18 No requirements 19 No requirements 20 No requirements I
- See evaluation in Corrective Action section of !! CAR 57, Final Report
- As modified by FSAR Change Notice 3364
.e 9e.
.""'*u' OUALITY ASSURANCE PROGRAM Atta hment 2 MANAGEMENT CORRECTIVE ACTION REPORT e
,076766 707,"3 u C A R.i 07704i REPORT NO.:
57 JOB NO.:
7220 O N O.:
DATE: _ March 17. 1982 1 DESCRIPTION * (including References):
FSAR section 7.4.1.1.3.2 states: power for the auxiliary feedwater (AFW) level control valves is from Class 1E 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 (1LV-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 QA Management O
O Procurement ISSUED BY:
7-M42 P oe.cf GA Er9n r D.'.
Note:
This deficiency was reported to the NRC by the client as potentially reportable on March 9, 1982.l 7
ll REPORTABLE DEFICIENCY:
[
NOTIFIED IENT: I/// M O NO E YES J
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I Ill CAUSE:
See Attachment III CAUSE AND CORRECTIVE ACTIONS TAKEN Dated July 8, 1982.
CORRECTIVE ACTION TAKEN:
AUTHORIZED BY:
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Section Number Page of
076766 niNiCExENr C0aRECTIVE ACT10N REr0Rr 07704i MCAR 57 Auxiliary Feedwater Level Control Valves Power Supplies III CAUSE AND CORRECTIVE ACTION TAKEN CAUSE:
This deficiency is considered to be an isolated case of incorrect assignment of power at the 120 V ac level. The requirement for supplying 120 V ac preferred (battery-backed) power for motor operated valve is unique. Valves, motors, and other inductive loads do not normally require constant and continuous power supply and therefore are powered from noa-battery-backed supply. 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 TAKEN:
Schematic Diagram 7220-E-158(Q) and 120 V ac Panel Schedules 7220-E-31(Q) and 7220-E-32(Q) were revised and now show that all auxiliary feedwater level control valves are fed from Class IE 120 V ac preferred (battery-backed) power.
Reference:
DCN 15 to Drawing 7220-E-158(Q); DCN 14 to Drawing 7220-E-31(Q) and 7220-E-32(Q), Revision 16.
Reviewed the FSAR to verify that commitments to feed components and/or systems from any of the Class IE and Non-class IE 120 V ac preferred (battery-backed) systems were met.
Three anomalies were noted:
- 1) Core Flood Tank Vent Valves Position Indication.
FSAR, Volume 13, Page 7.1-16 states that indicating light power is supplied from 120 V ac preferred control power. The Indicating lights are not powered from 120 V ac preferred power. The existing Non-class IE instrument and control power supplies to the indication j
are acceptable because redundant indication is provided by core j
flood tank (CFT) pressure and level indication in the control room.
t FSAR Change Notice 3389 was issued to revise this FSAR Section.
l
- 2) Core Flood Tank Vent Valves.
FSAR, Volume 13, Page 7.4-14a states that power for the vent valves is provided by Class IE 120 V ac preferred power. The valves are not powered from Class IE 120 V ac preferred power but from Class IE control and instrument power. The existing Class IE instrument and control power supplies (diesel-backed) are acceptable as they meet single failure criteria. FSAR Change Notice 3389 was issued to revise this FSAR Section.
7/8/82 HH 1
o Management Corrective Action Report MCAR 57 Auxiliary Feedwater Level Control Valves Power Supplies
- [6[OO III Cause a d C r e tive Action Taken..
- 3) Power Operated Relief Valve (PORV)
FSAR, Volume 13, Page 7.6-9 states that the only supporting system for the power-operated relief valve is a Class IE battery
-backed preferred power source. The Power Operated Relief Valves operate on 125 V de fed from Class IE 125 V de systems. For low
-voltage power systems, the term ' preferred' applies only to battery-backed 120 V ac power and is not applicable to the 125 V de supplies to the power operated relief valves. FSAR Change Notice 3389 was issued to revise this FSAR Section to correct the terminology to state that only supporting system for the power operated relief valves are the Class IE 125 V de systems.
FSAR commitments to feed components and/or systems from any Class IE or Non-Class IE 120 V ac preferred (battery-backed) systems are met.
You are referred to the Management Corrective Action Report MCAR 57 Final Report, Dated June 16, 1982 for more detail.
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