ML20081E054
| ML20081E054 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 10/02/1983 |
| 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, 83-07-#1, 83-7-#1, NUDOCS 8311010447 | |
| Download: ML20081E054 (6) | |
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D POW 8f u-w ce Vice President - Projects, Engineering and Construction General off 6ces: 1945 West Parnell Road, Jackson, MI 49201 * (517) 78& O453 October 2, 1983 83-07 #1 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 OVERLOADING OF CLASS lE MOTOR CONTROL CENTERS (MCC'S)
FILE:
0.4.9.79 SERIAL:
23802 On September 2 W R Bird notified Mr J Harrison and Mr R Gardner of your staff of a 50.55(e) reportable condition concerning overloading of Class lE Motor Control Centers during a design basis event. This letter is a final report in that the process and part corrective actions are completely described in the attached report, along with the schedule for releasing the design change package to modify the hardware.
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JWC/WRB/lr Attachments:
- 1) MCAR-1, Report No 71, dated September 1, 1983
- 2) MCAR-71, Final Report, dated September 15, 1983,
" Overloading of Class lE Motor Control' Centers (MCCs)"
CC: Document Control Desk, NRC Washington, DC RJCook, NRC Resident inspector Midland Nuclear Plant DHood, USNRC NRR 8311010447 831002 PDR ADOCK 05000329 S
PDR OCT 31983 OC0983-0027A-MP01
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2 83-07 #1 Serial 23802 OM/0L SERVICE LIST Hr Frank J Kelley Atomic Safety & Licensing Attorney General of the Appeal Board State of Michigan U S Nuclear Regulatory Commission Hs Carole Steinberg, Esq Washington, DC 20555 Assistant Attorney General Environamntal Protection Division Mr C R Stephens (3) 720 Law Building Chief, Docketing & Services Lansing, MI 48913 U S Nuclear Regulatory Commission Office of the Secretary Washington, DC 20555 Mr Myron M Cherry, Esq Suite 3700 Ms Mary Sinclair Three First National Plaza 5711 Summerset Street Chicago, IL 60602 Midland, MI 48640 Mr Wendell H Harshall Mr William D Paton, Esq RFD 10 Counsel for the NRG Staff Midland, MI 48640 U S Nuclear Regulatory Commission Washington, DC 20555 Mr Charles Bechhoefer, Esq Atomic Safety & Licensing Atomic Safety & Licensing Board Panel Board Panel U S Nuclear Regulatory Commission U S Nuclear Regulatory Commission Washington, DC 20555 Washington, DC 20555 Dr Frederick P Cowan Ms Barbara Stamiris 6152 N Verde Trail 5795 North River Road Apt B-125 Rt 3 Boca Raton, FL 33433 Freeland, MI 48623 Mr Fred C Williams Mr Jerry Harbour-1 sham, Lincoln & Beale Atomic Safety & Licensing 1120 Connecticut Ave, NW, Suite 325 Board Panel Washington, DC 20036 U S Nuclear Regulatory Commission Washington, DC 20555 Mr James E Brunner, Esq Mr M I' Miller, Esq Consumers Power Company Isham, Lincoln & Beale 212 West Michigan Avenue Three First National Plaza Jackson, MI 49201 52nd Floor Chicago, IL 60602 Mr D F Judd Mr John Demeester, Esq Babcock & Wilcox Dow Chemical Building PO Box 1260 Michigan Division-l Lynchburg, VA 24505 Midland, MI 48640-Mr Steve Gadler, Esq Ms Lynne Bernebei-2120 Carter Avenue Government Accountability Project--
St Paul, MN 55108 1901 Q Street, NW Washington, DC.20009 September 6, 1983 OC0983-0027A-NP01
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l272b-D Serial: 23802 og OUALITY ASSURANCE PROGRAM" (9
MANAGEMENT CORRECTIVE ACTION REPORT MCAR-1 REPORT NO.
71
. g,a.g JOB NO. 7220 Q NO.
DATE 9/1/83 l' DESCRIPTION (including references):
Midland FSAR, Subsection 8,1.4.3, states that any design basis event does not cause loss of electric power te more than one load group, surveillance device, or protection system oevice sufficient to jeopardize the safety of the unit. Contrary to this, during finalization of electrical calculations it was discovered that the loading that would be present on redundant motor control centers (MCCs) 0B45 and 0846 as a result of a fuel pool accident or LOCA could be onough to trip the circuit breakers supplying MCCs 0B45 and 0846, or the circuit breakers supplying IB23/2B23, and IB24/2B24. Consequently, power to the redundant loads fed from the MCCs wculd be lost following these design basis events.
- RECOMMENDED ACTION (Optional)
- 1) Revise and issue design change as required to applicable drawings and schedule.
- 2) Review all class IE motor control centers to ensure that loading conditions for these devices are in accordance with FSAR and system design criteria.
- 3) Determine root cause of deficiency and take appropriate corrective action to preclude recurrence.
- 4) Issue interim or final report by 9/16/83.
REFERRED TO 5C ENGINEERING O CONSTRUCTION O OA MANAGEMENT O
.- L 4 M33 O PROCUREMENT ISSUED BY Project QA Engmeer
' Date J
ll REPORTABLE DEFICIENCY NOTIF D CLIENT WNM O NO DEYES Project Manager
[
Da'te ll1 CAUSE CORRECTIVE ACTION TAKEN AUTHORIZED BY Date STANDARD DISTRIBUTON ADDITONAL DISTRIBUTON AS APPROPRIATE DMSON OA MANAGER ENGINEERING MANAGER FORMAL REPORT TO CLIENT MANAGER OF QA BPC PROJECT ENGINEER (if SectionII Applies)
Date GPD OA MANAGER OE SUPERVISOR l
LAPD OA MANAGER SFPD OA MANAGER CONSTRUCTON MANAGER PROJECT MANAGER PROJ SUPT /PROJ CONSTR MANAGER I
CLIENT CHIEF CONSTR QC ENGINEER CORRECTIVE ACTION IMPLEMENTED DMSON PROCURENT MGR PROJ PROCUREMENT MGR PROCUREMENT SUPPLIER QUALITY MGR AND DIV SUPPUER QUALITY MGR VERIFIED BY Project G A Engineer Date
- Descree wt space provided and attach reference docurnent.
AAPD-0161 l
I28506 Serial: 23802 i
ugjet:
MCAR 71 (Issued 9/1/83) g OVERLOADING OF CLASS IE MOTOR CONTROL CENTERS (MCCs)
FINAL REPORT Date:
September 15, 1983 1
Project:
Consumers Power Company Midland Plant Units 1 and 2 Bechtel Job 7220 INTRODUCTION This provides the final status and course of corrective action required pursuant to MCAR 71.
DESCRIPTION OF DEFICIENCY Midland FSAR, Subsection 8.1.4.3, states that any desi n basis event does i
not cause loss of electric power to more than one load group, surveillance device, or protection system device sufficient to jeopardize the safety of the unit. Contrary to this, the loading that would be present on redundant MCCs OB45 and 0846 as a result of a fuel pool accident or LOCA could be enough to trip the circuit breakers supplying MCCs OB45 and OB46, or the circuit breakers supplying IB23/2B23, and 1B24/2B24 Consequently, power to the redundant loads fed from the MCCs would be lost following these design basis events.
MCC 0545 and OB46 are subfed f rom MCCs 1B23/2B23 and 1B24/2B24. MCCs OB45 and OB46 each feed a fuel handling ares emergency exhaust fan (OVV-86A or B) and a fuel handling exhaust heating coil (OVE-04A or B).
The heating coil is interlocked to the fan and runs only when the fan is operating and high humidity is present. The combined current requirements of the fan and the heating coil is approximately 250 amperes.
Upon occurrence of a fuel pool accident, the fans are automatically started (reference FSAR Table 8.3-1).
The load of the fan and the heating coil, in conjunction with other running loads, could exceed the 300 ampere circuit breaker trip rating.
A similar condition could exist following occurrence of a LOCA when the fuel handling area emergency exhaust fans are manually started (reference FSAR Subsection 9.4.5.2.3).
MCAR 71 128506 Fina Report Page 2 128509 S_UMMARY OF INVESTIGATION AND HISTORICAL BACKGROUND This deficiency was identified while performing a periodic load study of 1
the electrical distribution system. The potential impact of this condition on the safety of plant operations was also reviewed.
ANALYSIS OF SAFETY IMPLICATIONS The combination of loads that would be expected to be present af ter a fuel pool accident or LOCA could exceed the 300 ampere trip rating of the circuit breakers feeding MCCs OB45 and OB46 resulting in the loss of those MCCs.
In addition, the combination of loads could exceed the trip rating of the load center circuit breakers feeding MCCs IB23,1B24, 2B23, or 2B24, resulting in the loss of Class 1E circuits fed f rom those MCCs.
This condition, had it remained uncorrected, could have adversely affected the safety of operations at the Midland plant.
PROBABLE CAUSE The root cause has been determined to be a an isolated case where the combined effect of a change to the mode of operation and an increase in equipment rating was not factored into in the design.
CORRECTIVE ACTION 1.
Design change package 3439 is scheduled to be issued on October 14, 1983, to resolve the deficiency.
The action required to resolve the above concern entails exchanging MCC feeds which involves replacement of eight cables. MCCs OB45 and OB46 will be fed directly f rom load centers 1B17, 2B17, IB18, and 2B18. MCCs IB89, IB90, 2B89, and 2B90, which are presently fed from the load centers and have a significantly lighter load, will be fed from MCCs 1B23, IB24, 2B23, and 2B24, respectively.
2.
All Class 1E MCCs have been reviewed to ensure that loading conditions for these devices are in accordance with the FSAR and system design criteria. No other deficiencies have been identified.
l 3.
In March 1983, instructions (in accordance with Engineering Department Procedure 4.37) were issued which require that the cummulative effects of design changes are assessed and recorded. The assessment is recorded on a " change notice log" which is incorporated into the applicable calculations. Engineering action, if required, is taken accordingly.
l
MCAR 71 Final Report Page 3 l28599 128506 REPORTABILITY Based on the safety implications, this deficiency was reported to the NRC in accordance with Title 10 of the Code of Federal Regulation Part 50.55(e) on September 2, 1983.
submitted by:
4.G, Kovach
(
Electrical Group Supervisor
- u-o 4 J Approved by:
E.M.Hugheg Project Engineer Concurrence by:
I
.L. Cast 4bberry 4
hief Electrical Engineer Concurrence by: /
l N
E.H. Smith Engineering Manager Concurrence by:
. I 7
far M.A. DietrichF Project Quality Assurance Engineer c4 JGK/CS/h1 090901 1
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