ML20062L656
| ML20062L656 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 08/13/1982 |
| From: | Leasburg R VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, Varga S Office of Nuclear Reactor Regulation |
| References | |
| 484, GL-81-14, NUDOCS 8208190195 | |
| Download: ML20062L656 (3) | |
Text
.
VINGINIA EI.ECTRIC AND Powan CourANY Ricntuonn, VzaOINIA 23261 H.H.LsAmauno v n s r..... n August 13, 1982 Nuca. man Dramationes Mr. Harold R. Denton, Director Serial No. 484 Office of Nuclear Reactor Regulation N0/JTS/ms Attn:
Mr. Steven A. Varga, Chief Docket Nos. 50-280 Operating Reactors Branch No. 1 50-281 Division of Licensing License Nos. DPR-32 U.S. Nuclear Regulatory Commission DPR-37 Washington, D.C.
20555 Centlemen:
SEISMIC QUALIFICATION OF AUXILIARY FEEDWATER SYSTEM SURRY POWER STATION UNITS 1 AND 2 Vepco originally responded to NRC Generic Letter 81-14 with Vepco letter Serial ' No. 443, dated July 16, 1981, - and subsequent letter Serial No. 075, dated February 12, 1982 with an attached sketch (12846.01-MKS-3). To provide the additional information you requested, reference will be made to this ske tch.
A revised edition of the ske tch, with only minor changes, will be forwarded to you when it is made available.
The basic content of the sketch will remain the same.
The response to the questions raised by Mr. J. T. Beard and Mr. Don Neighbors of your staff will appear directly following the statement of the specific request, as follows:
Request 1(a)
Provide a schematic ske tch of the auxiliary feedwater (AFW) system from suction to discharge including. water source (s), heat sinks, piping, and all major mechanical equipment.
Response 1(a)
As noted above, revised sketch 12846.01-MKS-3 will be provided when it is made.
available. This sketch details a schematic view of the entire auxiliary feed-water (AFW). system from suction to discharge, including all ' water. sources,-
heat sinks, and. major mechanical equipment. - The. sketch also includes all piping except.that covered by the items in parts 1(b) and 1(c) below.
D 8208190195 820013 PDR ADOCK 05000280
}.
P PDR
d
. Vino NIA Ez.zctmic AMD POWER COMPANY TO Request 1(b)
Provide a schematic sketch of the AW system from suction to discharge including connected branch piping up to and including the second valve which is normally closed or capable of automatic closure when safety function is required.
Response 1(b)
Ske tch 12846.01-MKS-3 encompasses, without exception, all connected branch piping up to and including the second valve which is normally closed or -
capable of automatic closure when the-safety function is required.
As identified by the sketch, all 3/4 inch vent and drain lines are not shown as branch piping.
These vent and drain lines consist of a normally closed 3/4 inch isolation valve and a short run of piping.
These lines are supported such that they maintain the seismic integrity of the AW system.
Request 1(c)
Provide a schematic ske tch of the AW system from suction to ' discharge including any branch piping outside the AW system boundary to a point of three orthogonal restraints if any po rtion of the. branch piping is structurally coupled to the AW system boundary such that the seismic response of the branch line transmits loads to the AW system.
Response 1(c)
The main feedwater system constitutes the only system that has branch piping, outside the AW ' system boundary, which is structurally coupled-to the AW system.
The seismic response of these lines would transmit loads to the AW system in the case of a seismic event.
Since the main feedwater system is a Seismic Class 1 system, it' fully meets the requirement of being supported up to a point of three orthogonal restraints.
In addition, sketch 12846.01-MKS-3 identified cross connect piping to and from the two 300,000 gallon condensate storage tanks as _being non-seismic.
This
. part of the system is considered non-seismic up to but not including the. valve which isolates this. portion of the system from. the seismically qualified -
boundary of tha AW system. This non-seismic section of piping is.not used in any Station Accident or Emergency Procedure and is normally. isolated by manual valves from the seismic AW system.
The cross connect section of piping is only. used as a means to transfer. water from tanki. to tank L under normal operating conditions.
Request 1(d)
Provide a schematic sketch of the AW system from suction to. discharge including l all structures supporting or housing the AW system components.-
e o
, Vino:NIA EttCTRIC AND POWEH COMPANY TO Respo nse 1(d)
All structures supporting or housing the AW system components are identified by sketch 12846.01-MKS-3.
Request 2 Identify any connected branch piping associated with the AW system that does not fully meet the boundary requirements specified in items (b) and (c) above.
Indicate the Seismic Category 1 items and boundaries on the sketch.
Justify the acceptability of any deviations.
Response 2 Included in items (b) and (c) above is all the connected branch piping associated with the AW system.
All the piping identified above fully meets the boundary requirements set forth by that particular section.
In addition, sketch 12846.01-MKS-3 identifies all Seismic Category 1 items and boundaries associated with the AW system.
Since there are no deviations from the requirements identified above, acceptability justification is not applicable to this response.
In summa ry, Vepco feels that the above responses will satisfactorily answer the questions raised by Mr. Beard and Mr. Neighbors. As previously mentioned, a revised sketch 12846.01-MKS-3 will be forwarded to the NRC as soon as possible.
If you have any questions or require additional information, please contact Vepco.
Very truly yours, S
.u R. H. Leasburg cc:
Mr. James P. O'Reilly, Regional Administrator Office of Inspection and Enforcement Region II Atlanta, Georgia 30303 Mr. Richard C. DeYoung, Director Office of Inspection and Enforcement Washington, D.C.
20555