ML19260C104

Final Deficiency Rept Re Containment Depressurization Actuation & Safety Injection Actuation Circuitry.Indicates Resolution of Revisions to Previously Reported Circuits Not Complying W/Fsar

ML19260C104
Person / Time
Site:	North Anna
Issue date:	12/14/1979
From:	Brown S VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
References
964A, NUDOCS 7912180560
Download: ML19260C104 (2)

Text

.

Vepco _ _ _ _ _ _ _ . _ _ . _ _ _

December 14, 1979

~

Mr. James P. O'Reilly, Director Serial No. 964A Office of Inspection & Enforcement PSE&C/GLP:mac:mc U.S. Nuclear Regulatory Commission Region II Docket No. 50-339 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303

Dear Mr. O'Reilly:

On November 16, 1979, a report was made under One provisions of 10CFR50.55(e) concerning Containment Depressurization Actuation (CDA) and Safety Injection (SI) Actuation Circuitry.

In our 5 day report (Serial No. 964 of November 21,1979), we indicated which circuits did not comply with various comitments made in the North Anna FSAR. In this report, we will indicate the status of the revisions, if any, to each of the previously reported circuits.

The following areas do not comply with IEEE 279-71, Section 4.16:

1. A resetting of the CDA (Containment Depressurization Actuation) signal prior to expiration of the time delay relays will prohibit the start of the following pumps:

a) Recirculation Spray Pumps (195 & 210 sec) b) Service Water Monitor Sample Pumps (120 sec)

Resolution: The pump circuits have been modified so that once the CDA or SI is received, the pumps will continue through the timing sequence until two operator actions occur: (1) reset CDA or SI and (2) place control switch in " pull to lock."

The following areas do not comply with the response to comment 7.4 in the FSAR:

1. On resetting of CDA or SI signal, the following devices return to their non-emei:;ency mode without a second operator action on the device control circuit:

a) Main Control Room Supply and E/haust Air Op. Dampers b) Charcoal Filter Air Op. Dampers c) Containment Recirc. Fans 2-HV-F-1A&B d) Control Rod Drive Cooling Fans e) Service Water Valves to Containment Recirc. Air Coolers f) Divert Valves for the Air Ejection Exhaust Resolution (a-d): These circuits have been redesigned (and will be modified prior to initial criticality) such that two operator actions will be required to reposition or restart these devices: (1) reset CDA or SI and (2) operate associated control gf9 switch. g 7912180 560 // (~

1609 236 Q

Resolution (e&f): These devices can be adequately controlled through the use of administrative procedures.

2. A resetting of the CDA signal and a subsequent loss of offsite power results in a non-automatic restart of the following pumps on restoration of site emergency power; a) Recirculation Spray Pumps b) Recirc. Spray Casing Cooling Pumps c) Quench Spray Pumps Resolution: We have investigated these circuits with respect to our statements in section seven (7) of the FSAR and we have found that they are in fact in compliance in that if a CDA signal is present and a loss of power occurs, the pumps will restart automatically upon restoration of power. They will not restart if the CDA has been reset as stated in the FSAR. By way of this report, we therefore wish to delete these circuits from the list of circuits which are in noncompliance.

This is our final report on this item. If you have further questions, please contact this office.

Very truly yours,[

R o; L h Sam C. Brown, Jr.

Senior Vice President - Power Station Engineering and Construction cc: Mr. Victor Stello, Director Office of Inspection & Enforcement

? Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation p

1609 237