ML19031C385
| ML19031C385 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 02/01/1977 |
| From: | Schneider F Public Service Electric & Gas Co |
| To: | O'Reilly J NRC/IE |
| References | |
| LER 1977-003-01 | |
| Download: ML19031C385 (5) | |
Text
Frederick W. Schneider Vice President Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 201/622-7000 Production Mr. James P. O'Reilly Director of USNRC Off ice of Inspections and Enforcements Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406
Dear Mr. O'Reilly:
LICENSE NO. DPR-70 DOCKET NO. 50-272 REPORTABLE OCCURRENCE 77-03/lT February 1, 1977 Pursuant to the requirements of Salem Generating Station Unit No. 1 Technical Specifi~ations, Section 6.9.1, we are submitting Licensee Event Report for Reportable Occurrence 77-03/lT.
This report is required within fourteen (14) days of the occurrence.
CC:
Director, Office of Inspection and Enforcement (40 copies)
Director, Office of Management Information and Program Control (3 copies)
Sincerely yours, I I 60
Report Number:
Report Date:
Oqcurrence Date:
Facility
- -03/lT 1/18/77 1/10/77 Salem Generating Station Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:
Failure of valve operators on lSJl and 1SJ2.
CONDITIONS PRIOR TO OCCURRENCE=
Recovering from Reactor Trip.
Tave:
547°F, Pressure:
2235 psig DESCRIPTION OF OCCURRENCE:
Following a Reactor Trip, valves lSJl and 1SJ2 were opened from the Control Room to lineup the RWST to the charging pump suction.
It was ob-served that when the valves opened, the motor operator breakers tripped.
Investigation revealed both valve operators had failed.
Technical Speci-fication Action Statement 3.0.3 was implemented and the unit was placed in Mode 3.
DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:
Failed torque switches.on both 11mitorque valve operators caused the motors to draw excessive current damaging the motor windings.
ANALYSIS OF OCCURRENCE:
At 1510 on 1/10/77, Action Statement 3.0.3 was implemented as well as the Action Statement for LCO 3.l.2.2(b) and LCO 3.5.2(e).
In compliance with Action Statement 3.0.3, the Reactor was placed in Mode 3 at 1606.
At 2255, 1SJ2 was operable and Action Statement 3~9.3 and 3.l.2.2(b) was cancelled.
At 1100 on 1/11/77, lSJl was operable and Action State-ment 3.5.2(e) was terminated.
No violation of Technical Specifications occurred.
At no time was there any danger to the health and safety of r
the public or site p~rsonnel.
CORRECTIVE ACTION:
Both motors had damaged windings and needed to be rewound.
Two motors from spares were used to replace the damaged units.
New motors were installed and torque switches were checked and reset.
Valves were stroked and tested satisfactorily.
Damaged motors were sent off site for rewinding.
Report 77-03/lT. 1/18/77 FAILURE DATA:
Valve Operator Manufacturer:
Limitorque Mode 1:
- sMB-0 0 Prepared by T. L. Spencer
~.;___..:.._---
Manager -~alem Generating Station SORC Meeting No.
11-77
LICENSEE EVENT REPORT CONTROL BLOCK I
6 LICENSEE LICENSE EVENT NAME LICENSE NUMBER TYPE TYP£
@m!NIJISIG!Sl~l Jso101-10101010101-101qJk41 ll ll ll 1Jo W-Ll-J REPORT REPORT CATEGORY TY,.E SOURCE OOCKET NUMBER EVENT CATE REPORT CATE IOT1l coN'Tl1:..LQJ LJ:j 59 lJ!j I 0 I 51 0 I -I 0 I 21 71 2J I 0 11 11 I 0 17 17 I I 0 I J I J I 8 17 I 7J
~
57 sa so 51 69 74 75 EVENT DESCRIPTION
@:ID I Whil*e recovering from a reactor trip, valves lSJl and 1SJ2 were opened I 7
89
~
@][]I from the Control Room to J.:ineup the RWST to the charging pump suction. j 7
8 9 lliiS lo 141 1:>;--T_h_i_s_w_a_s_n_e,,_c_e_s_s_a_r...;;y_b_e_c_a_u_s_e_P_r_e_s_s_u_r_i_* z_e_r __
l_e_v_e_l_h_a_d_d_e_c_r_e_a_s_*e_d_t_o_l_7%_a_i_s_o_--...i 7
8
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I lating letdown.
It was observed that when the valves opened, both motolf 7
B 9
~I breakers tripped.
The motor breakers were reset and the valves were 7
8 9 SVSTEM COCE
@mtSIFI 7
8 9 10 CAUSE COCE LEJ 11 CAUSE DESCRIPTION COMPONENT COOE IMIOITIOIR..JXJ 12 17 PRIME COMPONENT SUPPl..IER lLJ 43 COMPONENT MANUFACTURER IL 12 10 10 I 44 47 VIOLATION LNJ 48 00 I
BO
~I The apparent cause of this occurrence was the torque switch failing to. I
~i9 stop the motor operator.
This caused the motor to draw excessive curre~t 7
89 w
[Ifill damaging the motor windings.
These valve operators are model SMB-00, I
7 8 9 so FACll..ITY r.r.1 STATUS L!..L!J lQJ.
1 a
g FORM OF
"°POWER I 01 01 O I 10 12 METHOOOF OTHER STATUS OISCOVERV CISCOVERY CESCRIPTICN l.,.,._.......,N~/=A.__ __ __,I
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-1.,.,.._ ______ ~N*/~A;._ __.......... __ _.;. __ ---..i 13 44 45 46 I
ao ACTIVITY CONTENT RELEASED OF REI.EASE AMOUNT OF ACTIVITY Eli) l:£j
~ I
. N/A LOCATION OF RELEASE II~ __________
- N~./~A..;.._ ______ _,,_--~
7 B
9 10 11 44 45 I
ao PERSONNEL EXPOSURES NUMBER TVPE OESCRIPTION l1Til101o!OI !ZJ
~',------=N/~A=----------------------------------..,,!
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11 12 13 J
PERSONNEL INJURIES I
BO NUMBER OESCRIPTION
(!El IO IO I O I I N/A 1
e 9 11 12 J
OFFSITE CONSEQUENCES 11151 I N/A ri-19 LOSS OR DAMAGE TO FACILITY J
TYPE OESCRIPTION
. (!]!]I Z I I N/A 1
a~ lo BO AOOITIONAL FACTORS I
90 OJ!JI EVENT DESCRIPTION & CAUSE DESCRIPTION (Continued on Page 2) 1 e 9 IIl!J...-------------------------------------------------~------------~
I 1
&9 ao PHONE: ( 609) 365-7000 I
Ext. Salem-528:
I
LER 77-03/lT Page 2 EVENT DESCRIPTION (Continued) closed.
Investigation revealed that both motor operators had failed.
lSJl and lSJ2 provide a parallel path from the RWST.
Since both valves were inoperable, no redundant path existed.
Motors on both valves were replaced from spares.
Torque switches were reset and tested satisfactorily. This is the first occurrence of this type.
(77-03/lT)
CAUSE DESCRIPTION (Continued) manufactured by Limitorque Corporation.