ML20010D184

Final Deficiency Rept Re Nonqualified Heating,Ventilation & Air Conditioning Sys,Initially Reported on 810320.Design of Mods to Sys Completed.Installation Will Be Completed by Fuel Load

ML20010D184
Person / Time
Site:	Grand Gulf
Issue date:	08/14/1981
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-81-265, NUDOCS 8108240083
Download: ML20010D184 (5)

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MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi P. O. B O X 16 4 0, J A C K S O N, MI S SI S S I P PI 39205 JAMES P. McGAUGMY, JR.

]u ass.su~r vice m s ot=7 August 14, 1981 g m c.i..

Of fice of Inspection & Enforcement D' '

U. S. Nuclear Regulatory Commission 8 Region II 101 Marietta Street, N.W.

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Suite 3100 [

4[lG g y 7OOI A Atlanta, Georgia 30303 s,gN@

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Attention: Mr. J. P. O'Reilly, Director N

SUBJECT:

Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416/417 File 0260/15525/15526 PRD-81/22, Final Report, Non Qualified HVAC Systems AECM-81/265

Reference:

AECM-81/148, 4/20/81 On March 20, 1981, Mississippi Power & Light Company notified Mr. P. A.

Taylor, of your office, of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGdS) construction site. The deficiency concerns non-seismically qualified ventilation systems which provide environmental cooling of seismically qualified systems.

We have determined that, had this deficiency remained uncorrected, it could have adversely affected the safety of operations of the nuclear power plant and is therefore reportable under the provisions of 10CFR50.55(e). It is not reportable under the provisions of 10CFR21, as explained in the attached final report.

Yours truly, J. P. McGaughy, Jr.

KDS:dr ATTACHMENT cc: See page 2 TbN

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8108240083 010814 l

{DRADOCK05000 Member Middle South Utilities System

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Mr. J. P. O'Reilly AECM-81/265 NRC Page 2

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Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner Mr. Victor Stello, Director

! Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission ,

i Washington, D.C. 20555 i '

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Mr. G. B. Taylor South Miss. Electric Power association

P. O. Box 1589 l Hattiesburg, MS 39401 i

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I bbe: Mr. D. C. Lutken Mr. J. Letherman Dr. D. C. Gibbs Manager of BWR-6 Licensing Mr. J. N. Ward General Electric Company Mr. J. P. McGaughy, Jr. 175 Curtner Avenue Mr. W. A. Braun San Jose, CA. 95125 Mr.'R. Trickovic Mr. J. W. Yelverton Mr. L. F. Dale Mr. D. M. Houston Mr. C. K. McCoy U. S. Nuclear Regulatory Commission Mr. T. H. Cloninger Division of Licensing Mr. R. A. Ambrosino Washington, D. C. 20555 Mr. A. J. Iosue .

Mr. G. B. Rogers M , J. Matore Mr. M. .

ffffams U. S. Nuclear Regu atory Commission Mr. D. L. Hunt Division of Licensing Mr. A. G. Wagner ashington, D. C. 20555 Mr. P. A. Taylor PRD or Inspection Report File File 5

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? Attachmtnt to AECM-81/265 Pagn 1 of 2 FINAL REPORT TO PRD-81/22

1. Description of the Deficienc,E The HVAC equipment rooms on Elevation 133'-0 of the Control Building and the Spent Fuel Pool Cooling Pump Room in the Auxiliary Building contain safety-related equipment which is seismically and environmentally qualified and must operate after a seismic event. NRC FSAR questions 010.24 and 010.25 requested information on how these rooms would be environmentally controlled af ter a seismic event. Upon review by our Architect / Engineer of the existing HVAC design, it was noted that HVAC to the Control Building HVAC Equipment Room and the Spent Fuel Pool Cooling Pump Room was provided only by non-seismically qualified HVAC systems. During the review, it was also noted that the Standby Gas Treatment System rooms, which required ventilation to avoid exceeding equipment qualification temperatures while operating, were not provided with a seismically qualified JVAC system.

This deficiency af fects the Spent Fuel Pool Cooling Systen (G41), Control Roou HVAC System (Z51), Standby Gas Treatment System (T48), and the Energency

. Switchgear and Battery Rooms Ventilation System (Z77). It in applicable to both Unit 1, Unit 2, and Common. It does not apply to the NSSS vendor.

II. Analysis of Safety Implications If this condition had remained uncorrected, the possibility exists that excessive temperatures could be attained in the rooms described, which could have affected the operation of the safety-related switchgear and emergency battery room fans, control room standby fresh air fans, the standby gas treatment systems fans, and spent fuel pool cooling pumps. Potertially, failure of this equipment could cause loss of secondary containment integrity, loss of control room environment, failure of safety-related switchgear, and loss of fuel pool cooling. Therefore, this deficiency is reportable under 10CFR50.55(e).

None of the HVAC systems had been turned over to MP&L, therefore this defici-ency is not reportable by MP&L under the provisions of 10CFR21.

III. Corrective Actions Taken The cause of the deficiency was a failure by our Architect / Engineer to address the operability requirements of interfacing safety-related equipment in the HVAC design. The deficiency extends to safety-related HVAC syetems, safety-related switchgear, control room environment, and the secondary containment.

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e Attachmsnt to AECM-81/265 ..

- . Pags 2 of 2 A review of safety-related equipment cooled by non-qualified HVAC systems, and having a potential for overheating, was conducted. Corrective actions were taken as follows:

(1) For the HVAC equipment rooms, the Emergency Switchgear and Battery Rooms Ventilation System (Z77) has been redesigned to redirect surplus air f rom that system into the HVAC equipment room to maintain the temperature in the room within acceptable limits with the normal HVAC system inoperable.

(2) For the spent fuel pool cooling pump room a redundant seismic Category I cooling system has been designed. i e

(3) The Standby Gas Treatment System (SGTS, T48) has been redesigned to redirect room air from the Auxiliary Building corridor across to the SGTS equipment rooms to provide ventilation cooling for the safety-related equipment when the normal HVAC system is inoperable.

The design of the modifications to these systems has been completed. Installa-tion will be completed by fuel load.

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