ML20083K709
| ML20083K709 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 01/26/1979 |
| From: | Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | |
| References | |
| HOWE-20-79, NUDOCS 7901300119 | |
| Download: ML20083K709 (6) | |
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General Of fices: 1945 West Pernell Road, Jackson, Michtgen 49201. (517) 788-0453 January 26, 1979 Hove-20-79
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Mr J G Keppler, Regional Director _.'
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Office of Inspection and Enforcement -
US Nuclear Regulatory Cc==ission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAUD NUCLEAR PLANT UNIT NO 1, DOCKET i!O 50-329 UNIT no 2, DOCKr2 NO 50-330 AIR FILTERING UNITS In accordance with the requirements of 10 CFR 50 55(e), this letter constitutes an interim report on the status of the discrepancy found in the heater viring of the air filtering units for the control room.
A description of the discrepancy, potential safety implications, investigetion and planned corrective actions are documented in the attachments to this letter.
Another report, either interim or final, vill be sent on or before March 9, 1979
Attachment:
1.
Quality Assurance Program, Management Corrective Action Report, -
MCAR-1, Report 27, dated December 28, 1978.
2.
MCAR-27, Interim Report #1, Air Filtering Units, dated January 12, 1979 CC: Director of Office of, Inspection and Enforcement Att: Mr John G Davis, Acting Director, USNRC (15) r of Office of Management Information and Program Centrol, IENRC (1).
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, :'., h5 12/28/78 7220 0 NO.4. 651 DATE u No.
111ne Scicty /.pplisnce (P.O. 7 2 2 ts-M-l> U)
! l* DESCHIFTION Lir.cluding references):
vendor of the cir filtering units advised Ecchtel that they had found a discrepancy in.their viring installed for the hesters cf 1: nits CW-7SA and B & OW 94A 6 D.
TS/. should have provided AUG sizca 10 L 8 (per liEC).
Ucvever, At:C si c 12 uss t
installed.
Dschtel initici revicu'did not determine that there uas any impact on safety and coditional infor=ction uas requested from 1:SA. Af ter revicu of that infomtion trg2ther Uith project, criteria, project engineering.dctcrained that the deficiency uns reportabic and 1SA uns so cdvised.
The deficiency is repertchle since the thyroid Jose to control rocm operators could cy.ceed the dose limits specified in
- RECOMMENDED ACTION (Optional)
Take those steps necessary to hcve the discrepant wir'ing replaced. (Give schedule date 1.
2.
State uhat steps the supplier is tching, to prevent recurrence.
3.
1.ssure that no other components supplied by 1SA arc involved.
4.
Prepare an interic report and issue to the Project I!anc;;er within fif teen days containing all cvailable information together uith a secte=ent as to when, a complete report will be issued.
REFE RRED TO
@ ENGIN$ERING CONSTRUCTION
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NSCFITTION (continued)
Page 2 100rR50 Appendix A General Design Criteria 19, as referenced dn FSAR Section 9.4-1,1,1.
The dose limit could be exceeded based on reduced efficiency of the charcoal filters due to high relative htimidity if the heater 5 failed to operate. The deficiency in the wire size was due to lack of infor=ation on the vendor's fabrication drawing.
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Att:chment 2 Hove-20-79 Bechtel Associates Professional Corporation Attachment to BLC-7018 Page 1 of 2
SUBJECT:
MCAR 27 (issued 12/28/78)
Air Filtering Units (MR 7220-M-150)
INTERDi REPORT:
1 DATE:
January 12, 1979 l
PROJECT:
Consumers Power Company Midland Plant Units 1 and 2 Bechtel Job 7220 Description of Discrepancy '
Mine' Safety Appliances (MSA), vendor of the air filtering. units, has advised us by their letter dated November 11, 1978, that they have found discrepancy in the wiring installed from the control panel to the (See CP Co Note) heaters of units OVM-78A and B and CVM-94A and B.
To comply with the heaters, MSA should have provided ninimum AWG sizes 10 and 8 (per NEC).
.Instead, size 12 wire was installed. MSA informed us in their TLX dated December 19, 1978, that this discrepancy was the result of a lack of information on MSA's, internal installation. drawings.
This type of document is not normally subjected to Bechtel review.
Safety Implications MSA stated in their TLX dated December 19, 1978, that if this discrepancy had not been detected, the heater could fail to function as a result of.
overloading of the wires. This failure could result in the charcoal' absorber being subjected to high relative humidity air and ther.eby decrease the absorption efficiency of the charcoal. 'This decrease in charcoal absorption efficiency of units OVM-8A and B (control room makeup air filter units) could result in'the control room operator thyroid dose level to be exceeded as specified in'10 CFR 50, Appendix A General Design Criteria 19, as ' referenced in FSAR Subsection 9.4.1.1.
Failure of the heaters in the fuel handling area exhaust air filter units OVM-94A and B is not considered reportable.
CP Co I;ote: The stated control panel is a local control panel mounted'
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directly on the housing of the air. filtering unit.
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Bechtel Associates Professional Corporation MCAR 27 IITIERIM REPORT 1 Attachment to BLC-7018 January 12, 1979 Page 2 of 2 Corrective Action MSA proposes to correct the misapplication of wiring by replacing these wires with correct AWG sizes. The retrofit of these units will be done by Bechtel under MSA's supervision. 'NCR 1733 has been applied to the
- equipment at the site, and this will be used to follow up and close this item.
HSA has been requested to confirm what steps h' ave been taken to prevent recurrence and to ensure that no other components supplied by MSA are involved.
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!I Submitted by:
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Approved by:
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Concurrende by:
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