ML20128H839
| ML20128H839 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 02/08/1993 |
| From: | Sieber J DUQUESNE LIGHT CO. |
| To: | NRC OFFICE OF THE SECRETARY (SECY) |
| References | |
| NUDOCS 9302170176 | |
| Download: ML20128H839 (2) | |
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[ paret Ve ley Power $tation Sheppmpoort. P A 16077 0004 l
of Vice P et dont and p,
Chief NurJeat Offeer i
Nuc'est Power Divis>on U.
S. thiclear Regulatory Commission Attnt Docketing and Service Branch Washingto:i, DC 20555
Subject:
Beaver Valley Power Station, Unit No. 2 Docket No. 50-412, License No. NPF-73 Alternato Minimum Flow Recirculation Subsystem e
In response to the requeat of 1tovember 25, 1992, and subsequent request dated Decereber 18,
- 1992, Duquesne Light Company (DLC) met with the Nuclear Regulatory Commission
( *1RC; on January 7, 1993.
jointly attended by the four plants with potential This meeting was alternate minimum flow recirculation subsystem (AMF) concerns'which included Millstone 3,
Vogtle 1
and 2, Commanche Peak 1 and 2 and-Beaver Valley 2.
Westinghouse was invited to attend by the utilities in order to provide the necessary generic history and system details concerning the AMP.
DLC representatives reviewed the Beaver Valley 2 system in detail and identified the basis for determining system operability.
The DLC conclusion of vrocability was based on the following:
An engineer'.ng analysis was performed by DLC and validated q
. estinghouse to confirm that hydraulic design parameters W
by were satisfactory to prevent fluid -flow problems such as-relief valvo chatter.
A successful AMP flow test was performed at the Commanche Peak plant.
Beaver Valley 2 and Commanche peak have similar' hydraulic characteristics.
There
.are significant differences in configuration and hydraulic design parameters between Beaver Valley 2 and Shearon Harris.
It was these design parameters that contributed to the Shearon Harris event.
As. an additional' enhancement, DLC will.im'plement emergency operating
. procedure changes by ~ February 5,
- 1993, to address.
considerations beyond -design bases for the potential of excess blowdown through the relief valves.
h21 l fo} fha d 76 i
F CK 05000412 PDR I Q.
TR m
'a&44 y
5 Alternate Minimum Flow Recirculation Subsystem Page 2g In
- addition, we will bench test at least one of the subject relief valves at each refueling outage to determine the valve setpoint.
As discussed in the meeting of January 7, the Beaver Valley 2 AMP subsystem in operable for all combinations of high head safety injection pump operation.
If you have any questions on this
- issue, please contact Mr. 11.
k.
Tonet, Manager of 11uclear Saf ety.
Sincerely, L. NLbW--
D.
Sieber cc:
Mr.
L.
W.
Rossbach, Sr. Resident Inspector Mr.
T.
T.
Martin, flRC Region 1 Administrator Mr.
G.
E.
Edison, Project Manager Mr. M.
L.
Bowling (VEPCO)