ML20079H943

Final Deficiency Rept 136 Re Improper Actuation of Containment Purge Valves.Initially Reported on 831208. Further Evaluation Indicates Condition Not Reportable Per 10CFR50.55(e)

ML20079H943
Person / Time
Site:	Waterford
Issue date:	01/11/1984
From:	Gerrets T LOUISIANA POWER & LIGHT CO.
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
136, E3-K84-64, IEB-80-06, IEB-80-6, W3K84-0064, W3K84-64, NUDOCS 8401240128
Download: ML20079H943 (2)

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• NEW ORLEANS. LOUISIANA 70174 * (504) 366-2345 UTIUTIES SYSTEM January 11, 1984 W3K84- 0064 Q-3-A35.07.136 Mr. John T. Collins Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012

REFERENCE:

Telecon C. Hooper (LP&L) and W. Crossman (NRC IV) on December 8, 1983 l

Dear Mr. Collins- -- ,

'l Ls, .

SUBJECT:

Waterford SES Unit No. 3 -

g l 7 g t Docket No. 50-382 l' lj Potentially Reportable Deficiency No. 136 "ContainmentPurgeValves,ImproperActuationkf dl h

Final Report On December 8, 1983, a problem with the actuation of the Containment Purge Valves was reported as Potentially Reportable Deficiency No. 136. Further evaluation of the previously described condition indicates this condition is not considered reportable pursuant to the requirements of 10CFR50.55(e).

EVALUATION It was determined that the CPV's actuate as follows on CIAS and Hi-Radiation.

CIAS: Upon CIAS the CPV's Makeup (2HV-B150B, 151A, 152A) and Exhaust (2HV-B155A, 154B, 153B) receive a direct emergency signal to close.

Upon SIAS, the RAB Ventilation Exhaust Fans (E-22 (3A), (3B) ) trip.

The only combination of events that would lead to the CPV's reopening would be clearing of the emergency signal, and a spurious failure in the non-IE CP-50 PAC logic. (Loss of power to CP-50 would maintain the CPV's closed).

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1 8401240128 840111 1 PDR ADOCK 05000302 S PDR r

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Mr. J. T. Collins

. January' 11, 1984 W3K84-0064 Page 2 Hi-Radiation:

Upon a high radiation from the plant stack or containment area monitors, the CPV's close; the E--22. fans do not receive a signal to trip.

If the Hi-Rad signal clears before the variable inlet valve (VIV) passes thru the normal setting from the purge setting, the valves will reopen.

If the Hi-Rad signal. does not clear until af ter the. VIV passing thru the normal setting, the-CPV's will only reopen if the operator moves the selector switch to Normal and then to Purge.

, .The concern is whether the intent of our commitment to NRC IE Bulletin 80-06 (see response to FSAR Question 030.35) which prohibits components from returning to their pre-emergency state upon system level ESEAS reset, is met.

In the case of CIAS, the intent of IEB 80-06 is met in that there is no

. automatic resetting of components unless both the ESFAS signal clears and

. either the E-22 fans are actuated or there is a spurious failure in the CP-50

-logic.

'In the case of high-radiation, there is the possibility of the CPV's opening if the high-rad clears prior to the VIV passing thru the normal purge setting.

'This is mitig'ated, however, by two important facts. First, a high rad signal

. .from either the containment.or the plant stack monitors must clear,

- drastically reducing the possibility of the signal clearing when not appropriate. -Second, Waterford-3 is bound by a Technical Specification which allowo only.90 hours0.00104 days <br />0.025 hours <br />1.488095e-4 weeks <br />3.4245e-5 months <br /> per year of purging in Modes 1 thru 5. Under the terms of NRC Branch Technical Position CSB 6-4, a radiological off-site dose analysis is not required for Waterford if subject to-such a Tech. Spec. The rationale behind this is-that such limited purge time makes the possibility of a radiological accident with the CPV's open very small.

In view of the above, PRD-136 is considered not reportable.

Very truly yours, PH

-Yd M T. F. Gerrets

' Quality Assurance Manager

.TFG:CNH:JC cc: Director Office of Inspection & Enforcement i U. S. Nuclear Regulatory Commission Washington, D.C. 20555 (15 copies) ,

+j . ..

. Mr. J. T. Collins January 11, 1984 W3K84-0064 Page 3 Director

-Office of Management Mformation and Program Control U..S. Nuclear Regulatory Commission.

Washington, D.C. 20555 Mr. E. L. Blake Shaw, Pittman, Potts, & Trowbridge 1800 M Street, N.W.

Washington, D.C. 20036 Mr. W. M. Stevenson Monroe & Lemann 1424 Whitney Building

.New Orleans, Louisiana 70130 Records Center Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339

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