ML20012E345
| ML20012E345 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 03/23/1990 |
| From: | Sieber J DUQUESNE LIGHT CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9004040190 | |
| Download: ML20012E345 (5) | |
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P, U. S. Nuclear: Regulatory Commission f
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Washington, DC 20555 l
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Reference:
Beaver Valley Power Station, Unit No. 1 i
Docket No. 50-334, License No. DPR-66 f
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Additional Information for Exemption Request t1
!'t Gentlemen The following information is provided in support of the application for exemption from GDC-57 previously submitted by letter dated January 11,'1990.
This letter includes information
't discussed during the March 13, 1990 telephone conference between Mr. Peter Tam, and Mr. Jin Guo of-the NRC, and members of my' staff.
The information provided below includes background information describing system operation', and additional bases for the exemption request.
Also attached for information are simplified recirculation spray system drawings.
I Backaround information
'j The containment depressurization system is composed of two i
groups of subsystems: the quench spray subsystems and the 4,
recirculation spray subsystems.
These systems are designed to
. cool and depressurize the containment within 60 minutes following any loss of coolant accident (LOCA), and to maintain a subatmospheric pressure in the containment for an extended period L,
following the LOCA.
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l This is accomplished by spraying water into the containment jj via the spray rings located in the dome.
Quench spray pumps, pumping water from the refueling water storage tank, provide the h
initial spray flow.
-Spray flow along with reactor coolant system l<
leakage drains to the containment sump.
A short time later the
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four recirculation spray pumps take water from the containment L
sump and recirculate it through an associated recirculation spray L
heat exchanger to the spray rings.
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Additional In, formation for Exemption Request.
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The four recirculation spray heat exchangers are cooled by 1
river water. ' River water flow is initiated by automatic opening of river water valves (MOV-RW-103A,B,C, and D;I in the supply g
River water valves at the recirculation spray heat exchanger inlet (MOV-RW-104A,B,C,.and DJ and outlet (MOV-RW-105A,
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C, and D) are normally open.
These eight (8) valves are manually operated from the control room benchboard with 2 position s
H-switches (CLOSE and OPEN).
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l' recirculation spray heat exchanger) analyze' a continuous sample
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During accident conditions, four detectors (one for each obtained from each heat exchanger river water outlet.
An activity measurement is indicative of a heat exchanger tube leak.
A.high-high alarm alerts the operator to take corrective action.
Please refer to the attachment for the following discussion, m
Operating Manual Section 1.30.4 includes annunciator response
' procedure P, Correctina Safety Related Alarm conditions, which
. requires that appropriate corrective action be taken, including the following:
l 1.
Isolation \\of the affected heat exchanger (RS-E-1A) by closing the outlet valve (MOV-RW-105A).
2.
Dispatch of the operator.to close radiation monitor (RM-RW-100A) return isolation valve;(RW-619).
3.
Complete isolation of heat exchanger (RS-E-1A) by closing the inlet isolation valves (MOV-RW-104A).
The above actions would effectively isolate heat exchanger (RS-E-1A) and are typical of the actions performed to isolate any recirculation spray heat exchanger leak in a timely manner.
Basis for Exemotion t
A.
Radiation monitor instrument lines should remain open (unisolated) following a DBA to allow rapid detection and isolation of any radioactive releases resulting from a p
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recirculation spray heat exchanger tube leak.
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Instrument lines for radiation monitors (RM-RW-100A, B, C, and DJ are normally open following a LOCA to identify recirculation spray heat exchanger leakage.
If these i
instrument lines are isolated, leakage could be identified by downstream sampling, however, it would take longer to identify and isolate the leaking recirculation spray heat exchanger.
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BeSVCr V311Cy Pow 0r StCtien, Unit N3. 1 I
Docket No. 50-334, License No. DPR-66
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Maintaining these instrument lines open assures early detection and mitigating action.
Therefore, this design feature is in the interest of public health and safety.
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The recirculation spray heat exchangers are safety related and 4
therefore have high quality construction and inspectability.
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All parts in contact with pumped fluids are made of austenitic (304) stainless stee)..
In addition, pressure and Freon tests are performed at each refueling outage and eddy current examinations are conducted on a selected sample of tubes to detect degradation.
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If a recirculation spray heat exchanger were to develop a leak
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after the LOCA, a procedure is in place to instruct the operator to isolate the radiation monitor sample line as l
discussed in the background section above.
. V Based on the above, operation.of the plant with the existing configuration will not present an undue risk to the public health and safety, i
very truly yours, r
. D. Sieber pVice President Nuclear Group Attachement cc:
Mr. J.
Beall, Sr. Resident Inspector Mr. T. T. Martin, NRC Region I Administrator Mr.
P. Tam, Sr. Project Manager Mr. R. Saunders (VEPCO) a, i
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1 CONTAINMENT ISOLATION ARRANGEMENT FOR BEAVER VALLEY
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RECIRCULATION SPRAY HEAT EXCHANGER UNIT 1 RIVER WATER RADIATION MONITOR SAMPLE LINES 4 TO SUCTION O
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COOUNGTOWER RECIRCtKATION SPRAY PUMP HEAT EXCHANGER RW-193 r-RW468 RM-RW-100A I
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[RW-615 1
FROM RNER RW-619 RW416 r
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94,T h'PENET79 RW
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WATER PUMPS M
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RW462 j
RS-E-1A j
1 RETURN FOR MOV-RW-105A i
RM-RW-1000,C & D i
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PENET83 FROM OTHER RECIRC SPRAY i
HEAT EXCHANGERS j
INSIDECONTAINMENT l
OUTSIDECONTAINMENT RM MOV RS MOV RW RW RW RW RW RW RW-PENET E
PENET RW RW I
619 100A 616 615 614 105A 462 83 1A 79 193 104A 625 1008 622 621 620 1058 464 85 1B 81 195 1948 631 100C 628 627 626 105C 463 84 1C 80 194 104C 637 100D 634 633 632 105D 465 86 1D 82 196 104D Notes: i. This draunng is provided for informahon only.
- 2. Drain lines and expenson joints have not been shown on this drawing.
RECICULATION SPRAY SYSTEM BEAVER VALLEY
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UNIT 1 INSIDECONTMNMENT l OUTSIDECONTMNMENT g
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{MOV-RS-156B 10*w 10* 3 10"%
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RS-E-1A RS-E-1B RS-E-1C FIS-E-1D
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Ehb FTNET71 dh RECIRCULATION SPRAY HEAT EXCHANGERS MOV-RS-156A '
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OUTS!DE RECIRCULATION RECIRCULATION SPRAY l
SPRAY PUMPS
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PUMPS Notes: TNs is a sanolified dramng, prowded for irdormehon only.
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