ML20067C807
| ML20067C807 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 12/01/1982 |
| 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, 19102, 82-11-#1, MCAR-62, NUDOCS 8212100237 | |
| Download: ML20067C807 (6) | |
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General offices: 1945 West Pernell Road, Jackson, MI 49201 * (517) 786 0453 December 1, 1982 82-11 #1 Mr J G Keppler, Regional Administrator US Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND NUCLEAR C0 GENERATION PLANT -
DOCKET NOS 50-329 AND 50-330 CABLE SUBSTITUTIONS FILE:
0.4.9.67 SERIAL:
19102 On October 28, M J Schaeffer notified R N Gardner of your staff of a potential 50.55(e) concerning cable substitutions on four Class lE cables which were not sized in accordance with the design requirements. This letter is the final 50.55(e) report on this subject.
The Midland Project Quality Assurance Department (MPQAD) initiated the cable routing reinspection program on October 20, 1982 for all cables that had not been reinspected but which were installed prior to March 15, 1982. The subject substitution of four cables was identified during the first week of these reinspections. At the time of the writing of this letter, approximately 2,000 cables have been reinspected with no additional cables having been identified as being the incorrect cable. Thus, this condition is considered to be an isolated event.
The attached Management Corrective Action Report provides the complete description of the specific deficiencies and the corrective actions taken. As t.
noted in the report, the MPQAD reinspection program as well as the Project Quality Control Instruction (PQCI E-4.0) which covers installation of cables has been revised to contain a specific attribute to verify from the cable markings and the cable physical attributes that each cable meets the design requirements.
If this condition would reoccur in new work, the PQCI attribute would find it.
Further instances of this condition, if any, in old work (prior to November 12, 1982) will be inspected for by MPQAD.
JWC/WRB/lr 8212100237 821201 PDR ADOCK 05000329 S
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OC1182-0024A-MP01
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-2 Serial 19102 82-11' #1 Attachments:
(1) Management Corrective Action Report MCAR-1, Report No 62, dated 11/16/82 (2) MCAR-62. Final Report, dated November 16, 1982 CC: Document Control Desk, NRC Washington, DC RJCook..NRC Resident Inspector Midland Nuclear Plant 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 SilFreeman, Esq. Asst Attorney General WHMarshall GJMerritt, Esq, TNK8J Great Lakea QA Managers OC1182-0024A-MP01 l
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Serial 19102 QUALITY ASSURANCE PROGRAM
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MANAGEMENT CORRECTIVE ACTION REPORT MCAR1 093783 094655 REeORT NO.:
62 JOB NO.:
7220 Q N O.:
DATE:
11/08/82 l DESCRIPTION * (!ncluding References):
Four Class 1E power cables (2AB5515A, 2AB5516A, 1EB018B, and 1EB019B) were identified on NCR M01-9-2-145.
These cables were pulled and installed as AWG #14/3 instead of AWG #10/3. Drawing 7220-E37 Rev. 58 specifies that the cables be installed as AWG #10/3.
RECOMMENDED ACTION' (Optional):
- 1) Project engineering to documer c their evaluation of the condition for impact on safety for inclusioc in the final report.
- 2) MPQAD has included in the cable routing reinspection plan an attribute for determining correct cable being installed.
- 3) Quality Control to include a clarified inspection point in the cable installation inspection plan (PQCI) to minimize recurrence.
REFERRED TO:
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Bechtel Associates Professional Corporation 094655
SUBJECT:
MCAR 62 (Issued 10/29/82)
Four Class 1E Power Cable Installed as 3/Cf14 AWG instead of 3/C#10 AWG FINAL REPORT:
DATE:
November 16, 1982 PROJECT:
Consumers Power Company Midland Plant Units 1 and 2 Bechtel Job 7220 Introduction This report provides an evaluation of the condition for impact on safety and the course of corrective action requested pursuant to MCAR 62.
Description of Deficiency Four (4) Class 1E power cables (2AB55154, 2AB5516A, 1EB018B, and 1EB019B) were pulled and installed as 3/C#14 AWG instead of 3/Cf10 AWG. Circuit and raceway schedule 7220-E-37 Rev 58 specifies that the cables be installed as 3/C#10 AWG.
Summary of Investigation and Historical Background This deficiency was identified and documented in Consumers Power Company NCR M01-9-2-145.
These cables are installed in the power circuit of Decay Heat Return Letdown Bypass Valves 2M0-1158, 2M0-1159, 1M0-1058, and IMO-1059.
Analysis of Safety Implication In accordance with FSAR Subsection 8.3.1.1.8 Class 1E valve motors are specified with accelerating capability at 80% nominal voltage at their terminals. Based on this requirement, the predicted voltage at the motor control centers (MCC) and the circuit voltage drop that would be present with the #14 AWG cables in the circuit was calculated. An analysis of calculation results was performed to determine the voltage that would be available at the motor terminals. The results indicate that a voltage potentially below the limits for operation of valves 1M0-1058 and IM0-1059 could result. Valves 2M0-1158 and 2MO-1159 would have
_ sufficient voltage to operate. Failure of valve 1M0-1058 and 1M0-1059 to operate could adversely affect the safety of the plant.
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094576 Bechtel Associates Professional Corporation u84655 Final Report Page 2 In addition, the full load current of each of the four valves (16 amps) is greater than the continuous current allowed by design calculation 7220-QPE-8(Q) for 3/C#14 AWG cable routed in cable tray (9 amps). This, however, could not result in conductor overheating or degradation as valve operation is intermittant and of short duration.
Probable Cause The cause of this deficiency was:
- 1) That the cable reel tag carried both the reel serial numbers and the vendor's footage markings. The cable cut shop misinterpreted these numbers and identified the subject cables by the footage number rather than by the reel number. Since the footage number was the same for botn 3/C#14 AWG and 3/Cfl0 AWG cables, the cable log sheet was in error as to the correct cable identity. Field procedure FIE 4.100(Q) was revised and reissued on June 29, 1982 to define and clarify which number should appear on the tag,
- 2) Project Quality Control Instruction E-4.0 did not require verification of correct cable type by means of cable jacket markings or physical characteristics.
Corrective Action The corrective actions to resolve this MCAR are as follows:
1.
MPQAD has included verification of correct cable type as part of the cable routing reinspection plan.
F 2.
QC has revised Project Quality Control Instruction (PQCI E-4.P l
Rev 11) to require verification of correct cable type by means of cable jacket markings or physical characteristics as opposed to by cable identification tag.
3.
The four Cables 2AB5515A, 2AB5516A, 1EB018B and IEB019B have been replaced with 3/C#10AWG.
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Bechtel Associates Professional Corporation 094655 MCAR 62 Final Report Page 3 Reportability Based on the safety implications, this deficiency is considered reportable in accordance with Title 10 of the code of the Federal Regulation Part 50.55(e)
Submitted by:
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),J.G.Kovacht Electrical Group Supervisor Approved by:
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.M. Hughes Project Engineer
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Concurrence by/.:
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Concurrence by:
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E.H. Smith Engineering Manager Concurrence by:
M.A. Dietrich Project Quality Assurance Engineer LK JGK/LK/se(E) i l
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