ML19344B066

Final Deficiency Rept Re Lack of Complete Independence Between Subsys for Control Room & Emergency Switchgear Room Air Conditioning.Chilled Water Supply & Return Lines Will Be Reconnected to Proper Handling Units

ML19344B066
Person / Time
Site:	North Anna
Issue date:	01/18/1979
From:	Brown S VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
References
REF-PT21-80-274-000 037, 37, NUDOCS 8008250519
Download: ML19344B066 (2)

Text

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January 18, 1979 Mr. James P. O'Reilly, Director Serial No. 037 Office of Inspection & Enforcement PSE&C/RBC:bep/mc .

U. S. Nuclear Regulatory Conmission Region II Docket No. 50-339 101 Marietta Street, Suite 3100 Atlanta, Georgia 30003

Dear Sir:

On January 15, 1979, a report was made under the provisions of 10CFR50.55(e) concerning the lack of complete independence between the two redundant sub-systems for Control Room and Emergency Switchgear Room air conditioning.

- In accordance with the reporting requirements of 10CFR21, the following information is submittec':

A. Name and address of reporting individual:

Mr. E. A. Baum, Executive Manager Licensing and Quality Assurance Virginia Electric and Power Company P. O. Box 26666 Richmond, Virginia 23261

. . B. Facility, activity, and/or component affected:

North Anna Power Station, Unit 2 Contrcl Room and Emergency Switchgear Room Air Conditioning C. Name of firm constructing the facility or supplying the component, activity or servi:e.

Stone & Webster Engineering Corporation Bol7 g

P. O. Box 2325 Boston, Massachusetts 02107 /fo D. Description cf ' defect, deficiency, or failure to comply:

Air Handling Units 2-HV-AC-06 and 2-HV-AC-09 which are powered from the "2J" Emergency Bus have their piping connected so as to receive chilled water from Chiller 2-HV-E-04A which is powered from the "2H" Emergency Bus. Air Handling Units 2-HV-AC-07 and 2-HV-AC-08 which are powered from the "2H" Emergency Bus have their piping connected so as to receive chilled water from Chiller 2-HV-E-04B which is powered from the "2J" Emergency Bus. Thus a failure of either Emergency Power Source would disable both of the redundant subs'ystems for Control Room and Emergency Switchgear Room air conditioning.

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acm sucTmc mo rowen co mw to Mr. James > O' Reilly mer no. 2 E. Date of determination of reportability:

January 15, 1979 F. Similar components, activities, or services:

The chillers and air handling units are identical to those used on Unit 1 of the North Anna Station. However Unit 1 piping 1.s connected properly so as to provide the intended independence between the redundant air conditioning subsystems.

G. Corrective action which has been, is being or will be taken, the indi-vidual responsible and th'e 1e.ngth of time to complete.the action:

Stone and Webster field construction will reconnect the chilled water supply and return lines to the proper air handling units.

This will result in Air Handling Units 2-HV-AC-06 and 2-HV-AC-09 receiving chilled water from Chiller 2-HV-E-04B. Air Handling Units 2-HV-AC-07 and 2-HV-AC-08 will receive chilled water from Chiller 2-HV-E-04A. All work will be completed on the Controi Room and Emergency Switchgear Room air conditioning prior to the fuel load date.

H. Other infonnation:

Since no other actions will be required to correct the problem ,

described in section 0 of this report, we consider this to be the final report under the provisions of 10CFR50.55(e)(3).

Should you require further information, lease contact this office.

[r truly our ,

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Sensor Vice President Power Station Engineering Construction cc: Director, Office of Inspection and Enforcement (3) l l

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