ML20004C574

Final Deficiency Rept Re Heating,Ventilation & Air Conditioning Seismic Hangers,Initially Submitted on 800905. Constructor Has Inspected & Documented Rework Activity for All safety-related Hangers

ML20004C574
Person / Time
Site:	Grand Gulf
Issue date:	05/28/1981
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, AECM-81-185, NUDOCS 8106040290
Download: ML20004C574 (4)

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/ i MISSISSIPPI POWER & LIGHT COMPANY

' ] !I Helping Build Mississippi I adMdWidig P. O. B O X 16 4 0. J A C K S O N. MIS SIS SIP PI 3 9 2 0 5 "j,f,0$,Tc.lif- May 28, 1981 Office of Inspection & Enforcement D. S. Nuclear Regulatory Commission g Region II 101 Matietta Street, N.W.

Suita 3100 Atlanta, Georgia 30303 Attention: Mr. J. P. O'Reilly, Director

SUBJECT:

Grand Gulf Nuclear Station Units 1 and 2 - ,

Docket Nos. 50-416/417 4 'N '

s File 0260/15525/15526 , . ., d PRD-80/54, Final Reporti, *

.Z j" co HVAC Seismic Hangers 7_

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References:

1) AECM-81/31, 1/15/81 AECM-81/185 .

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2) AECM-80/242, 10/6/80 '% ' 75[ ,

On September 5,1980, Mississippi Power & Light Company notified '

Hunt, of your office, of a Potentially Reportable Deficiency'(PRD) av the Grand Gulf Nuclear Station (GGNS) construction site. This PRD identitied a conditir,n whereby seismic hangers installed by a subcontractor, R. Irsay Co.,

wers found to be not in conformance with specifications. This condition was previously identified as being reportable under the provisions of 10CFR50.55(e) in our letter AECM-81/31 dated January 15, 1981.

During the scope of the investigation into chia deficiency it was noted that seismic hangers installed by a different subcontractor, General Mechanicil Contractors, were also found to be not in conformance with specifications. The scope of this PRD was expanded to include both

! contra':to rs. The condition with the second contractor is also reportable under the conditions of 10CFR50.55(e) because of the generic nature of the def.iciency.

In that these items have not been d,' livered to MP&L for acceptance, this coedition for either subcontractor is not reportable under 10CFR21. Attached is one fic.al report on PRD-80/54.

l l All corrective actions for R. Irsay Co. installed hangers are ou our Constructor's MCAR-104. All corrective act.iora for General Mechanical Contractors are on our Constructor's MCAR-115.

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8106040ND //

Member Middle South Utilities System

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-Mr. J. P. O'Railly AECM-81/185 NRC Page 2 Yours truly ,

/J. P. McGaughy, Jr.

KDS:dr Attachment cc: Mr. N. L. Stampley Mr. R. B. McGahee Mr. T. B. Conner Mr. Victor Stallo, Director Office of Inspection & Enforcement U. S. Nuclear Regulatory. Commission Washington, D.C. 20555 Mr. G. B. Taylor South Miss. Electric Power Association P. O. Box 1589 Battiesburg,, MS 39401 O g 0 4

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Attachment to AECM-81/185  ?

Page 1 of 2 Final Report for PRD-80/54 I. Description of the Deficiency Saismic HVAC hangers at the Grand Gulf Nuclear Station, installed by R.

Irsay Co., were found to be contrary to the design requirements. The hangers were originally found to have incomplete welds at member connec-tion points. Further investigation revealed missing braces, undersized support members, and hangers that were not welded to the ducts. This -

deficiency was first reported on September 5,1980. The condition was first identified in the Auxiliary Building HVAC System, but subsequent investigations have determined that this condition is generic in nature and af fects all R. Irsay Co. installed hangers. Systems affected include Fuel Handling HVAC, Standby Gas Treatment, Control Room HVAC, Emergency Switchgear and Battery Rooms Ventilation, Containment Cooling, Drywell Cooling, and Standby Service Water House Vent.

On March 26, 1981 our Constructor reported to MP&L that seismic HVAC hangers installed by General Mechanical Contractors (GMC) also had numerous deficiencies such as undersized, incomplete or missing welds, and degradation of supplemental steel end cennections due to uncon-

trolled fabrication and installation practices. This condition affects numerous systems such as Standby Gas Treatment, Diesel Generator Building Ventilation, Control Building HVAC, Control Room HVAC, and t Emergency 'Switchgear and Battery Rooms Vencilation Systccs.

For the R. Irsay Co. installed hangers, the deficiency ap' plies only to Unit 1. For the GMC installed hangers," the deficiency is applicable to Unit 1 and common.

"rha cause of the deficiency in R. Irsay Co. installed hangers was wide-spread disregard by the subcontractor for the design specifications.

In the case of General Mechanical Contractor installed hangers, the cause was an inadequate training program and inadequate field super-vision of their inspectors' work.

This deficiency does not apply to the NSSS vendor in the case of either subcontractor.

, II. Analysis of Safety Implications The deficiencies found represent significant and substantial violations of AISC and AWS codes. These generic deficiencies collectively con-stitute a significant reduction in the strength and quality of the

, overall HVAC support system. Since an extensive engineering evaluation l

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2 Attachment to AECM-81/185 I Page 2 of 2 would be required to determine the effect on safety of plant operations, this condition meets the reporting criteria of 10CFR50.55(e).

This condition is not reportable under 10CFR21 because the af fected systems have not been tu';ned over to Mississippi Power & Light for acceptance.

III. Corrective Actions Taken ,

Our Constructor has inspected and documented the rework activity for all safety-related hangers installed by R. Irsay Co. Af ter analysis and e.'aluation of each discrepancy, disposition was made as to repair, rework, or use as is. All inspection, repair, and rework will be performed by our Constructor. Work is expected to be completed by June 30, 1981.

General Mechanical Contractors will inspect and document the rework activity for all II/I hangers installed by R. Irsay Co. within the scope of their work. R. Irsay Cc.'s contract was terminated and they have left the jobsite. GMC's contract calls for them to finish work that was left unfinished by R. Irsay Co. GMC will inspect and take corrective actions on all deficient seismic hangers within the area of this work.

All necessary repair and rework will be completed by September 1,1981.

Our Constructor will inspect and rework all R. Irsay Co. II/I hangers not within GMC's area of work. ,

The contract for R. Irsay Co. has been terminated, thus precluding any recurrence of the problem with this sub-contractor.

Upon identification of the deficiencies in the General Mechanical Contractor installed hangers, our Constructor issued a Stop Work Order against che company. The company was required to retrain and recertify their inspectors. Our constructor monitored this retraining and then re-inspected the first 75 hangers completed by General Mechanical Contractors to insure the inspection was complete and correct. The Constructor will perform a 100% inspection of the Q hangers. All corrective actions will be completed by August 1,1981.

To prevent recurrence our constructor has directed General Mechanical Contractors to have their Quality Control Supervisors monitor the work of their inspectors. Our Constructor is also continuing to monitor GMC's work closely.

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