W3P88-1840, Forwards Addl Response to NRC Bulletin 88-004, Potential Safety-Related Pump Loss. Related Info Encl
| ML20206A068 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 11/01/1988 |
| From: | Burski R LOUISIANA POWER & LIGHT CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| IEB-88-004, IEB-88-4, W3P88-1840, NUDOCS 8811140408 | |
| Download: ML20206A068 (10) | |
Text
O' LOUISl AN A / air 8AnoNNestneer. e.o.soxe0340 POWE H & LIGHT NEW ORLEANS. LOUISIAN A 70160 *
(504) 595-3100 Uti$bsY$
November 1, 1988 W3P83-1840 A4.05 QA U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555
Subject:
Waterford 3 SES Docket No. 50-382 License No. NPF-38 NRC Bulletin No. 88-04
Reference:
Letter W3P88-1247 f rom R.F. Burski to 11ocument Control Desk dated July 12, 1988, responding to NRC Bulletin 88-04, "Potent.'al Safety Related Pump Loss" NRC Bulletin 88-04 was is.'ned May 5, 1988 requesting action from holders of operating licenses or constraction permits for nuclear power reactors to investigate and correct as applicable two mini-flow design concerns. The first concern involves the potential for de :d-heading of one or core pumps in safety related systems that have a mini-flow line common to two or more pumps or other configurations that do not preclude pump to pump interaction during mini-flow operation. A second concern involves determining whether or not the installed mini-flow capacity is adequate for a single pump in operation.
The referenced letter identified thirty-four safety related centrifugal pumps for evaluation in regards to the concerns of NRC Bulletin 88-04 The non-Combustion Engineering supplied pumps were evaluated in the referenced letter for the two mini-flow concerns idcntified in the Bulletin. The evaluation concluded that there vere no piping configurations that could result in the dead-heading of one or more of the non-Corbuntion Engineering supplied purps.
Additionally, the mini-flow capacity was adequate for the non-Combustfor ", '
ring supplied pumps with the exception of the Containment Ss ay, Component Cooling Water Make-up, Diesel Oil Transfer, and Auxiliary Component Cooling Water purps. These pumps required field testing to determine the actual mini-flow rates which calculations showed were below the suppliers mini-flow requirements.
This ccrrespondence addresses the Combustion Engineering supplied purps in regards to the two mini-flow design concerns.
It also provides the field test results and evaluations of the non-Combustion Engineering supplied pumps which had lower calculated mini-flow rates than the suppliers requirements.
M 1 1 1 4 0 4 0 0 c f:1 1 0 1 FDR ADOR O'.xNo 302
// p' [
O Poc "AN EQUAL OPPORTUNITY EMPLOYER"
/ l
Page 2 W3P88-1840 i provides a tabular summary of the evaluation for the concern of dead-heading of one or more Combustion Engineering suppifed pumps.
Based on the review of the design drawings, this condition is not a concern for the Combustion Engineering supplied pumps at Waterford 3.
There are no piping configurations that would result in the dead-heading of one or more of the Combustion Engineering supplied pumps at Waterford 3. provides a tabular summary of the evaluation for the concern oi' adequate mini-flow capacity for a single Combustion Engineering supplied pump in operation. Based on calculations, the mini-flow rates for these pumps are acceptable. As a result of this evaluatinn, no further actions ara required at Waterford 3 for these pumps.
A review of the maintenance history for the Combustion Engineering supplied pumps shows that these pumps have not had a failure or experienced pump damage that can be attributed to cumulative operation or testing in the mini-flow recirculation mode.
Problems that would be associated with pump operation below the mini-flow recirculation capacity, such as impeller, shaft or bearing damage, have not been evident at Yaterford 3 to date.
LP&L will continue to monitor pump maintenance history through the established trending program.
LP&L has contacted the Combustion Engineering pump suppliers to determine if the original mini-flow rates are adequate to prevent pump damage. With the exception of the HPSI and LPSI pumps (the supplier has yet to respond to our request), the mini-flow values originally specified are acceptabic.
The liPSI and LPSI supplier, Ingersoll Rand, has not started on the evaluation of the mini-flow requirements.
Upon completion of a QA audit to include them on the Qualified Suppliers List (QSL)
Ingersoll Rand will proceed with its evaluation. The completion date for the evaluation has not been set.
In the interin, the original mini-flow rates have been used to conplete the evaluations required for the HPSI and LPSI pumps. Upon receipt of the forthcoming mini-flow requirement from Ingersoll Rand, LP&L will review the original evaluation for acceptability. Any activities resulting from an additional evaluation will be completed and documented in a timely manner. provides a tabular summary of the field tests performed on certein non-Combustion Engineering supplied pumps. These pumps had calculated mini-flow rates lower than the suppliers requirements as identified in the referenced letter.
Based on the results and evaluations of the field test data of the Diesel Oil Transfer, Auxiliary Component Cooling Water, Containnent Spray, and Component Cooling Water Make-up pumps, they have adequate mini-flow recirculation necessary for pump operation,
Page 3 W3P88-1840 Should you have any questions, feel free to contact Larry W. Laughlin at (504) 464-3499.
4 Very truly yourd, es #
R.F.
urski Manager Nuclear Safety & Regulatory Affairs RFB DDC ssf Attachments l
cc R.D. Martin, NRC Region IV J.A. Calvo, NRC-NRR I
D.L. Wigginton, NRC-NRR l
NRC Resident Inspectors Office E.L. Blake a
W.M. Stevenson
ATTACHMENT 1 to W3P88-1840 Page 1 of 3 CONCERN 1:
Potential for dead-heading one or more pumps that have a common mini-flow recirculation line that does not preclude pump-to-pump interaction during mini-flow operation.
(Combustion Engineering Supplied Pumps)
Recommended Pump Name Remarks Action Boric Acid Each pump has its own recirculation None Makeup Pumps:
line which is routed back to the BMi-MPMP-0001A respective boric acid makeup tank.
BAM-MPHP-0001B The recirculation lines tie into the (individual mini-pump discharge headers between the flow recirculation pump and the discharge check valve.
lines)
This prevents the interaction of one pump from dead heading the other pump.
The recirculation lines consist of a flow control valve and a needle valve arranged in a parallel configuration.
The needle valve provides the flow path for pump minimum recirculation flow during emergency boration. The flow control valve provides the flow path for tank recirculation. The flow control valve is always open (per administrative controls) except during emergency boration.
Boron Management Thesa pumps transfer fluid from None Flash Tank Pumps:
the BM flash tank to the holdup tanks.
BM-MPMP-0002A The pumps share a common recirculation BM-MPMP-0002A line which is routed back to the flash (ccmmon mini-flow tank. During normal system operation, recirculation lino) one pump is operable while the other is on standby. The possibility of pump-to-pump interaction is eliminated since the standby pump is switched off on the control room panel. The flow control valve downstream of the pumps maintains a set level in the flash tank.
These pumps are not necded fer safe shutdown of the plant or for reducing the consequences of an accident. These pumps do not provide an active safety function.
Reactor Drain The reactor drain tank pump anu the None Tank Pumpt equipment drain tank puep discharge BM-MPMP-0001 into a common line which is routed to (no mini-flov the FM flash tank. There are no modu-recirculation lating control valves between the purp line) and the flash tank. The reactor drain
ATTACHMENT 1 to W3P88-1840 f
Page 2 of 3 CONCERN 1:
Potential for dead-heading one or more pumps that have a l
common mini-flow recirculation line that does not preclude j
pump-to-pump interaction during mir.1-flow operation.
l (Combustion Engineering Supplied Pumps)
Recommended f
Pump Name Remarks Action Reactor Drain tank pump and equipment drain tank pump Tank Pump can run concurrently with no encroachment (Continued) on either pump's minimum flow rquirements.
l This pump is not needed for safe f
l shutdown of the plant or for reducing i
i the consequences of an accident. This
[
l pump does not provide an active safety function.
4 Equipment Drain The equipment drain tank pump and the None 4
Tank Pump:
reactor drain tank pump discharge into 1
BM-MPMP-0009 a coe: mon line which is routed to the (no mini-flow BM flash tank. There are no modulating
)
recirculation flow control valves between the pump and 4
line) the flash tank. The equipment drain i
tank pump and the reactor drain tank pump q
can run cor. currently with no encroachment i
on either pump's minimum flow requirement.
t This pump is not needed for safe i
i shutdown of the plant or for reducing i
I the consequences of an accident. This pump does not provide an active safety
}
function.
t'uel Fool Pumps:
The two pumps are arranged in None FS-HTMP-0001A a parallel configuration such FS-MPMP-0001B that their suction and discharge F
(no mini-flow headers tie into a common line recirculation between the fuel pool and fuel line) pool heat exchangers.
Systen I
design and operatinc procedures I
eliminate the need for a mini-flow i
recirculation linc. Pumps discharge into a close loop system with no
[
tiow control valves. With the two pumps running, the flow rate of each f
pump exceeds the vendor's recor: mended
[
minimum flow by a factor of 2.
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ATTACEMENT 4 to W3P88-1840 Page 3 of 3 CONCERN 1:
Potentlal for dead-heading one or more pumps that have a common mini-flow recirculation line that does not preclude pump-to-pump interaction during mini-flow operation.
(Combustion Engineering Supplied Pumps)
ReccA anded Pump Name Remarks Ac. ion Low Pressure The recirculation line for the "A" train None l
Safety Iajection pump branches off the pump's discharge Pumpar line between the pump and the pump's SI-hPMP-0001A check valve.
The recirculation line SI-MPMP-0001B contains a restrictic7 orifice for (Common mini-flow mini-flow control. Down:tream of the recirculation orifice, the recirculation line ties line) into a common return line shared by the "A" train High Pressure Safety Injection and Containment Spray Pumps.
The common return line routes the puep's flow back to the Refueling Water Storage l
Pool.
The common return lines have been sized to handle the combined mini-flows from the LPSI, H?SI and CS Pumps.
The piping configuration for the "B" pump recirculation line is similar to that of the "A" train pump.
High Pressure The recirculation line for the "A" None Safety Injection train pump branches off the pump's Pumps discharge line between the pump and l
SI-MPMP-0002A the pump's check valve.
The recircu-l 31-HPMP-0002B 1ation line contains a restriction l
SI-MPMP-0002A/B orifice for mini-flow control.
Downstream of the orifice, the recir-culation line ties into a common return line shared by the "A" train Low Pressure Safety Injection and l
Containment Spray Pumps. The connon return line routes the pump's flow back to the Refueling Water Storage Pool.
The common return lines have been sized to handle the combined mini-flow from the LPSI. HPSI and CS Pumps.
j l
The piping configuration for the "B" pump recirculation line is similar to the "A" train pump.
Yhe piping configuration for the "A/B" pump recirculation line is similar to the "A" train pumpe except mini-flow would be directed to either the "A" or "B" train coenon return line, depending on system line-up.
ATTACHMDG. 2 to
~'
W3P88-1840 Page 1 of 3 CONCERN 2:
Adequacy of the mini-flow recirculation line for single pump operation.
(Combustion Engineering Supplied Pumps)
Supplier Calculated Reco= mended Mini-Flow Recommended Punp Name Mint-Flow Rate In Recire. Liae Action Boric Acid Makeup 70 CPM During normal system cperation, None Pumps:
including pump operability RAM-MPMP-0001A testing, pump flow through each EAM-MPMP-0001B recirculation line exceeds (individual mini-flow 140 CPM.
recirculation Ifnes)
During emergency boration, pump tiow must be diverted to the charging pumps suction liner This is accomplished by opening the emergency boration valve 2CH-Vll2A/B and closing the flow control (s) valve in the pump re-circulation line(s). The pump recirculation line(s) will still pass approximately 40 CPM through the recirculation needle valve (s).
When terminating emergency boration, administrative procedures require the control room staff to stop the boric acid makeup pump (s) prior
^
to closing the emergency boration valve. The pump's recirculation flow control valve (s) is then returned to its normal open position.
Boron Manag-it 80 CPM Calculations indicate recirculation None. These Flash Tank Pumps:
line will pass approximately 35 wumps are not EM-MPMP-OOO2A CPM when system flow control valve needed for safe EM-MPMP-0002B is closed. The flow control valve shutdown of the (common mini-flow modulates open and close in an plant or for re-recirculation lines) effort to maintain a set water ducing the conse-level in the flash tank. The quences of an
ATTACHMENT 2 to
-i W3P88-1840 Page 2 of 3 CONCERN 2:
Adequacy of the mini-flow recirculation line for single pump operation.
(Combustion Engineering Supplied Pumps)
Supplier Calculated Recommended Mini-Flow Recommended Pump Name Mint-Flow Rate In Reci.c. Line Action Boron Management Flar.h Tank Pumps (Continued) flow control valve could be accident. These throttled closed for a few moments pumps do not pro-l while the flash tank pump is vide an active j
running. The 35 CPM recirculation safety function.
j flow renresents 25% of pump flow I
at pump's best efficiency point.
Reactor Drain Tank No mini-flow recircula-Not Applicable None.
This pump I
Pump:
tion lines.
is not needed for i
RM-MPMP-0001 safe shutdown of (no mini-flo/
the plant or for i
recirculation line) reducing the <.on-seque-ces of an accident. This i
pump does not j
provide an active safety function.
l Equipment Drain Tank No mini-flow recircula-Not Applicable None. This pump
{
Pump:
tion lines.
is not needed for
]
BM-MPMP-0009 safe shutdown of 1
(no mini-flow the plcnt or for l
recirculation line) reducing the con-i sequences of an
)
ace! dent. This i
pump does not
]
provide an active safety function.
l l
l 4
= _ _ _. - _. _ _ _.__ _ __ _
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ATTACHMENT 2 to I
Page 3 of 3 l
CONCERN 2:
Adequacy of the mini-flow recirculction line for single pump operation.
I (Combustion Engineering Supplied Pumps)
S t;; lier Calculated Recommended Mini-Flow Recommended 4
Punp Name Mini-Flow Rate In Recire. Line Action j
l l
1 Fuel Pool Pumps:
No mini-flow recircula-Not Applicable None FS-MPMP-0001A tion lir.es.
FS-MPMP-0001B i
(no mini-flow recirculation line)
Low Pressure Safety O r '.
- commendation:
Inservice testing of pumps None Injection Pumps:
100 indicate mini-flow through the SI-MPMP-0001A recirculation lines is greater SI-MPMP-0001B Latest recommendation:
than 100 GPM when pumps are run Avaiting...pplier Confirmation with closed discharge valves.
High Pressure Safety Original Recommendation:
Inservice testing of pumps None Injection Purps:
25 GPM indicate mini-flow through the 4
7 SI-MPMP-0002A r2 circulations lines is greater SI-MPMP-0002B Latest Recommendation:
than 25 GPM when pumps are run SI-MPMP-0002A/B Awaiting Supplier Confirmation with closed discharge valves.
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ATTACUMENT 3 to W3P88-184G Page 1 of 1 FIELD TESTING
SUMMARY
(Non-Combustion Engineering Supplied Pumps)
Concern 2:
Adequacy of the mini-flow capacity for single pump operction.
Supplier Calculated Recommended Mini-flow Pump Name Mini-flow Rate Rate Field Test Results Diesel Oil Transfer Pumps:
20 GPM Calculations indicate
- 1. ECF-MPMP-0001A: 46 CPM EGF-MPMP-0001A line will pass 18 GPM EGF-MPMP-0001B: 13 CPM ECF-MPMP-0001B if discharge header No further action in required.
(Individual mini-flow isolation valve is racirculation lines) inadvertently closed.
Auxiliary Component Cooling Original Recommendation:
Calculations indicate
- 1. ACC-MPMP-0001A: 193 CPM l
Water Pumps:
150 CPM the mini-flow recircu-ACC-MPMP-00018:
199 GPM j
ACC-MPMP-0001A Latest Recommendation:
lation will pass 135 CPM No further action is required.
j ACC-MPMP-000lB Awaiting Sopplier when discharge header or j
(Individual mini-flow confirmation temperature control reci~culation linen) valve is closed.
1 Containment Spray Pumps:
Original Recommendation:
Calculations indicate
CS-MPMP-0001B Latest Recommendation:
pass 59 CPM through its No further action is required.
i (Common mini-flow Awaiting Supplier mini-flow recirculation j
I recirculation line) confirmation line when pump is running i
with a closed discharge j
valve.
1 Component Cooling Water Original Recommendation:
Calculations indicate
- 1. CMU-MPMP-0004A: 29 CPM l
Make-Up Pumps:
30 CPM that each pump will pass CMU-MPMP-0004B: 31 CPM CMU-MPMP-0004A Latest Recommendation:
24 CPM through its mini-'
No further action is required.
i l
CMU-MPMP-0004d Avaiting Supplier flow recirculation line No credit is taken in Waterford (Common mini-flos confirmation when one pump is r~nning 3's accident analysis for these recirculation line) with a closed discharge pumps and the field tested flow valve, or each will pass rates are essentially identical 23 GPM through its mini-to the supplier's recommended flow recirculation line u.ai-flow rate. Based on this, when both pumps are the field tested mini-flow rates running with closed are acceptable.
discharge va'res.
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