ML20106D740
| ML20106D740 | |
| Person / Time | |
|---|---|
| Site: | McGuire  |
| Issue date: | 10/09/1992 |
| From: | Mcmeekin T DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 92-19, NUDOCS 9210140025 | |
| Download: ML20106D740 (7) | |
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lll Octobor'9, 1992 P..
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fMN U.S. Nuclear Roqulatory Commission 6
Documunt Control Desk Washington, D.C.
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dubject:
McGuire :luclear Gt.ation Unit I n-Inplant nov(cw Hoport. No. 92 13 Gentiomen:
This report 18 being submitted pursuant to Selected Licensoo Commitment 16.9-7, Remedial Action c.
This event-concerned the Standby _ Shutdown System being dotormined past inoperablo (for more than sovon days) due to the Unit 1 Chemicol Volumo And Control *:ystem Standby Makeup Pump being declared past inoporable.
This event is considered to bo of no significanco uit.h respect to the health and L
sa f oty _ of t.ho pub)ic.
Very truly yours, h h' w ~
b, T.C.
McMookin TLP/bcb Attachment xc:
Mr. S.D.
Ebneter INPO Records Contor Administrator, Region II Suito 1500 U.S. Nuclear Regulatory Commission 1100 CircJo 75 Parkway 101 Mariott.a St.,
NW, Suite 2900 Atlanta, GA 30339 Atlanta, GA 30323 Mr. Tim Reed Mr.
P.F.
Van Doorn U.S. Nuclear Regulatory Commission NRC Rouldent Inspector Office of Nuclear Reactor Regulation McGuirrs Nuclear Station Washington, D.C.
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9 MCGUIRE SAFETY REVIEW GROUP 1
INPLANT REVIEW REPORT 1.
REPORT NUMBER:
92-19
{
l 2.
DATE OF REVIEW:
Sentomber 10 - October 1, 1992 3.
SUBJECT DESCRIPTION:
This 30 day report is submitted an a
~
opocial report pursuant to Solected Licensoo Commitment (SLC) Section 16.9-7, Remedial Action c.
The Standby Shutdown System (SSS) was dotormined Past Inoperable for moro than 7 days duo to tho Unit 1 Chemical Volums and Control (NV) system Standby Makeup pump (IMNVPUOO46) boing declared Past Inoperable when it was discovered that the pump drivo shaft was rotating in the incorrect direction.
This report documents the related circumstances and provides correctivo actions-to provent recurrenco of a similar event.
1 i
4.
EVALUATION AND COHMENT:
e Abstract On August 4, 1992, Maj ntonanco personnel woro performing maintenanco activitics on Staadby Makeup pump IMNVPU0046.
During the maintenanco activities, it was discovered that the drivo shaft on pump 1MNVPU0046 was rotating in the s
opposito direction than specified on the pump casing.
I Problem Investigation Report (PIR) 1-M92-0127 was subsequently written to evaluato the reversed shaft rotation, determino the cause of the ovent, and corrective actions to be taken.
Unit I was in Mode 1 (Power Operation) at 99.9 porcont power at the time of discovery.
On September 9, 1992, Engineering personnel subsequently determined pump 1MNVPU0046 to be Past Inoperable for the timo period the pump was configured in this manner.
The causes of-this event aro Unknown and Management Deficiency because there woro inadequate requirements for ensuring l
correct pump rotation at the timo of installation.
Subsequently, the pump rotation was corrected, and the SSS roturned to operable status.
1
DPC!t4185 ItiPLANT REVIEW tio. 92-19 PAGE 2 of f-ljfichiround Thu standby makeup subsystem of the 18V system f unct. ions as part of the SSS to cor * "o1 reactor coolant volume should normal volume control ue unavailable following a post.ulated firo or security event.
The SSS serves as the last resort and fu designed t.o be used when the prolorred equipment has been rendered inoperablu.
One standby makeup pump is located in the annulus of each Reactor building to supply makeup flow to the React.or Coolant. (tic ) system.
The pump provides a means of makeup to recover normal syst.um leakage and fiC pump seal leakage.
The pump is manually started within 10 minutos of the hypothesized event to ensure the Reactor Coolant pump seals are not degraded.
The pump should not be stopped until the 11C system is at atmospheric pressure or until the liv syst.om charging pumps and a sourco of borated water are available for scal injection.
The design basis operating time for this pump is 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, however, the most probable event scenarios would expect the pump to be used for no more than 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
The st.andby makeup pump is of the positive displacement. (PD) design, reciprocating plunger type, and adds a constant quantity (26 gpm) of borated water to the 14C system.
The pump was manufactured by the Wheatly Gaso Company and is
(
designated as model SP-323.
The fluid end of the pump l
consists of 5 reciprocating plungors scaled with packing.
The power end of the pump consists of a camshaft and 5 connecting rods, cross heads, and wrist pin bushings which require o11 lubrication.
The pump is driven by a 3 phase 575 volt (V) 50 ho rsopc - - (IIP) induction motor at a rated speed of 900 RPM.
SLC 16.9.7, SdS, requirer t.h a t the SSS be operable during Modes 1,
2 (Startup), and 3 ( flo t Standby).
If any SSS components, such as a standby makeup pump or its associat.ed water supply, are inoperable, the SSS shall be declared inopurable.
Homedial Action paragraph c requires that. w i t. h the SSS inoperable for more than 7 days, submit a special re po r t.
- t. o the t1RC within
- t. h e next 30 days outlining the cause of tho inoperability, corrective actions bei ng t.a kea,
i and plans for restoring tho system to operable st.atus, i
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1 I
DPC/ Mils INPLAtlT REVIEW No. 92-19 PAGE 3 of 6 Description Of E vo n t.
On July 5, 1992, a routir.o performanco test proceduro PT/1/A/4209/01C, Standby Makeup Pump Plow Performanco Test, was performed to verify Standby Makeup pump IMNVPU0046 would muut flow requirements.
During the test, the rociprocating plunger packing on the pump was detormined to bo leaking.
Work order 91124736 wcs subsequently initiated to repair the pump.
On August 4, 1992, Maintenance Technician A repaired the pump, as directed by work order 91124736, by adjusting the packing on the reciprocating plunger assembly.
Tho_ pump was thoa started for functional verification and at approximately 1700, Maintenance Technician A observed that the pump camshaft appeared to be rotating in a direction annosite to the rotation arrow cast on the pump casing.
On the morning of August 5, 1992, Component Engincoring personnel were contacted and asked to evaluato tho.
significance of Standby Makeup pump IMtiVPU0046 rotating backwards.
An engineering evaluation was initiated.
This evaluation took almost all day and in olved discussion with Operations, site engineering, and vendor (Wheatley Gaso) engineering personnel.
It was then determined that Standby Makeup pump IMNVPL'004 6 would moet flow and pressure requirements but probably would not roccive adequato lubrication when operated with the camshaft turning backwards.
Therefore, it is assumed the pump would not have been able to run for the design period of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.
PlR l-M92-0127 was 9.:ucated to document the problem and ensure adequate fo'.lowup n7 tion was taken.
Subsequently, Standby Makeup pumre IMNVPU0046 was declared inoperable and logged in the Unit 1 Technical Specification Action Item Logbook (TSAIL) on Auoust 5,_1992, at 1740.
Werk order 92059571 was initiated to change the rotation of Standby Makeup pump 1MNVPUOO46.
The X and Y phase motor leads on Standby Makeup pump 1MNVPU0046 were subsequently rolled to provide correct pump rotation.
Hy 1723, August 6, 1992, all repair activities were complete and Standby Makeup pump }MNVPU0046 was returned to operable status.
Engineering personnel continued to evaluate past operability of the pump, and determine appropriate followup action.
On September 9, 1992, during a Saloty Review Group (SRG) and site engineerfng review and investigation of PIR 1-M92-0127, it was determined that Standby Makeup pump IMNVPU0046 was J
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e
.r DPC/MHS' INPIANT REVIEW No.-- 9 2-19 PAGE'4 of 6 Past Inoperablo'for the timo porlod the pump was configured to run in the roverso direction.
It was also dot.ormined that a-roportablo event por SLC section 16.9-7, Homodial Action c had occurrod.
4 Conclusion This event is-assigned a cause of Unknown because it could not be dotormined wnon or why Stondby Makeup pump 1MNVPU0046 rotation was configured to run in the reverso direction.
The pump direction of rotation is dotorminod by the electrical load configuration to tho 3 phano pump motor.
The only way to make the pump run in the reverso direction is to incorrectly wiro tho motor.
SRG and Component Engincoring personnel conducted an extensivo search of work roquest anc work ordor history to determino when Standby Makeup pump 1MNVPU0046 was configured to run in the roverso-direction.
A definito timo could not be catablished.when tho' pump motor was wired incorrectly.
The most probable timo was during initial pump installation which occurred prior to 1984.
No significant maintenanco has boon
'porformod that would have affected the rotational direction of the pump or motor since initial installation.
In 1984, Nuclear Station Modification (NSM) MG1-1674 was implomonted to replace the original 8 inch motor shoave with a 9 inch shaavo to increaso pump output.
Ilowever, the motor was not required to be disconnected to perform the NSM.
Improper rotation of this type pump is not easily detected.
Sinco the pump is a PD plunger type, its output is not affected by improper rotation.
Thoroforo, historical a
ongincoring analysis of performance test data did-not detect any problem with the_ pump rotetion.
During vibration data
. collection 05c pump is either off and is rotated by hand, or is running M. rated speed.
When the pump is running at rated spood, a person viewing the drive shaft would not be able to determino which direction the shaft is turning.
Normally, the area around the pump le cleared (for personnel safety reasons) prior to utarting the pump.
Thorofore, personnel performing routino maintenance or testing activities are normally not in a position to view the pump drive shaft when the motor is started.
The direction of pump drivo shaft rotation has no immediato effect on the performance of the pump.
Ilowever, site engineering personnoi have determined that the power end of the pump may receive inadequate Jubrication while the pump i
is run in the reverso direction.
When the pump is operated t
7
-a.
v DPC/MNS*
INPLANT REVIEW No. 92-19 PAGE 5 of 6 backwards, the Joad la shifted 'o the top of the cross heada which got poorer lubrication.
The pump lubrication system is designed such that oil is deposited in an oil gallery on the top.of the croso head boros.
Then, oil tricklos down to lubricato the cross heads and wrist pin bushings.
If the pump is run backwards, the procoas depends solely on the splash offect to lubricato all necessary parts.
Wheatley Gaso has not dono testing to dotormino how long the pump would run backwards before failure.
The pump is only operated for approximately 30 minutos, 4 timos por year for the performance test as speciflod by proceduro PT/1/A/4209/01C.
The pump is not heavily loaded during the test.
Historical vibration analysis has not shown any mechanical problems, therefore, the power end of the pump has'not been damaged due to routino testing.
A cause of Management Deficiency is assigned because there woro inadequate requirements for ensuring correct pump rotation at the time of installation.
Motor maintenance requiring the power loads to be disconnected are controlled by 1 of 2 procedures.
Proceduro MP/C/A/2002/01, Motor Inspection and Maintenance, establishes thn requirements to control tho inspection, maintenance, and r pair of electric motors.
This proceduro is normally used for motors abovo 600 V and 150 HP.
Step 11.5.3 includes a requirement to perform a rotation verification if the motor leads are disconnected during maintenance activitics.
Procedura IP/0/A/3190/02, Inductior. Motor Proventativo Maintenance, catabl.ishes the requirements to control proventativo maintenanco, inspections, and repair of AC induction motors 600 V and 150 HP or smaller.
Since Standby Makeup pump IMNVPU0046 is less than 150 HP, maintenance activity performed on the notor would be controlled by proceduro IP/0/A/3190/02.
However, there is no programmatic mechanism, in place, to ensure the pumo motor.is wired for correct rotation '
the motor leadc a.
disconnected.
The pump motor wiring was subsequently corrected and the SSS returnec to operable status.
Procedure IP/0/A/3190/02 will-be revised to add a requirement for rotational checks anytimo motor leads are disconnected during maintenance activities.
There were no personnel injuries, radiation ovoroxposures, or uncontrolled releases of radioactivo material ar a result of this event.
l
DPC/MllS *
.INPIANT. REVIEW No. 92-19 PAGE 6 of 6 Corrective Actiens Immodlato PIR l-M92-0127 was initiated to document and correct the roversed standby makeup pump shaft rotation.
F Eubsequent 1.
The motor loads of pump IMNVPU0046 were reconfigured to provido correct pump I
shaft rotation.
I 2.
Unit 2 Standby Makeup pump 2MNVPU0046 was verified with correct pump shaft rotation.
3.
Appropriato Catawba Nuclear Station parsonnel woro notified sinco they have identical standby makeup pumps.
Planned 1.
Procedure IP/0/A/3190/02 will be revised l!
to add a stop to require a rotational.
chock be performed anytimo motor leads are disconnected, h
4 1
.