ML20235X176
| ML20235X176 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 07/31/1987 |
| From: | Carey J DUQUESNE LIGHT CO. |
| To: | Russell W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20235X146 | List: |
| References | |
| 2NRC-7-189, IEB-85-003, IEB-85-3, NUDOCS 8710190243 | |
| Download: ML20235X176 (10) | |
Text
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M 2NRC-7-189 Beaver Valley No. 2 Unit Project Organization Telecopy 41 3 52 E xt.160
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July 31, 1987 Shippingport, PA 15077 i
United States Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406
{
ATTN: Mr. William T. Russell Administrator
SUBJECT:
Beaver Valley Power Station Unit No. 2 Docket No. 50-412 I.E.Bulletin 85-03 i
Motor Operated Valve Common Mode Failures, Final Report
REFERENCE:
Letter 2NRC-7-151 dated May 29, 1987 J. J. Carey to William T.
Russell Gentlemen:
In response to IE Bulletin 85-03, M0 VATS testing and switch setting on IEB 85-03 affected valves have been completed.
Attached is the final report iden-tifying the actions and results taken to satisfy the concerns of IEB 85-03.
This letter closes out final actions required by IEB 85-03 for BVPS-2.
DUQUESNE LIGHT COMPANY By ref Sen e
WRB/ijr NR/WRB/FNL/RPT l
AR/N/A cc:
k-P. Tan., Project Manager Mr. J. Beail, tRC Sr. Resident Inspector Mr. L. Privi,1y, NRC Resident. Inspector INP0 Records Center NRC Document Control Desk i
B710190243gh$h34 PDR ADOCK PDR L
P
s United States Nuclear Regulatory Commission Motor Operated Valve Common Mode Failures, Final Repcrt Page 2 COMMONWEALTH OF PENNSYLVANIA SS:
COUNTY OF BEAVER On this d/4/ day of
/f,["f,beforeme,a Notary Public in and for said Co[monwea[th and County, personally appeared J.
J. Carey, who being duly sworn, deposed and said that (1) he is Senior Vice President of Duquesne Light, (2) he is duly authorized to execute and file the foregoing Submittal on behalf of said Company, and (3) the statements set forth in the Submittal are true and correct to the best of his knowledge.
p.//27 (Aiie&
Notary Public lieut u.PArteur,merme nas SitPPts0PWT 000s. MME C005N 87 C05040108 EIPtett OCf. 23,1000 p.= lwr, Penuesinsi N*w%.15Mus
ATTACHMENT Motor-0perated Valve Common Mode Failures IE Bulletin 85-03 Duquesne Light Company (DLC) submitted letter 2':RC-6 -090, dated August 18, 1986, to satisfy the response required for Item (e) of IE Bulletin 85-03.
As an interim report, DLC also submitted letter 2NRC-7-151, dated May 29, 1987, to provide a status on completion of the program to addres s IE Bulletin 85-03.
The purpose of this letter is to verify that the program addressing IE Bulletin 85-03 has been completed and to provide a final report
- s. warizing items (a) through (d) of the Bulletin as requested in Item (f).
For completeness of addressing the Bulletin, some of the information previously transmitted is restated below.
As an extension of this program, DLC has gone beyond the requirements of the Bulletin regarding operability of motor-operated v alves.
Using M0 VATS (Motor Operated Valve Analysis and Testing System) equipment, DLC has tested all rising stem safety-related torque and limit switch seated valves at BVPS-2.
The valves have been set to manuf acturer's recommended thrust settings and tested to provide assurance that they will operate under intended design conditions.
I Response to Action Item (a)
As stated in DLC's August 15, 1986, letter, review of the BVPS-2 l
Auxiliary (emergency) Feedwater System verified that no motor-operated valves are used in this system.
Therefore, the requirements of IEB 85-03 apply only j
to the High Pressure Safety Injection System and those parts of the Chemical 1
and Volume Control System used for the high pressure injection function.
Table 1
1 lists the BVPS-2 valves for which IEB 85-03 is applicable (i.e., those valves required to function to initiate high pressure injection) and the design basis for each valve.
Design basis differential pressures were based on valve operation described in operating procedures and were conservatively determined by assuming a single pipe failure downstream of the valve with pump discharge pressure or volume control tank pressure, as applicable, at the valve inlet.
Response to Action Item;(b)
Table 1 identifies the normal and maximum torque switch settings for each of the valves.
These settings were based on valve manuf acturer specifica-tions and recommendations for the design differential pressure.
Switch Setting Category Type listed in Table 1 identifies the methodology for setting switches and is described in detail in Table 2.
Table 2 describes the specific operation of torque switches, limit switches, torque switch bypasses and motor thermal overload bypasses during normal and accident conditions.
The torque switch bypass and valve position limit switches are wired on separate rotors to ensure positive indication of valve closure.
Corrective maintenance procedure CMP-2-75M0 VATS-21E was used to test the valve operators with the MOVATS equipment.
The valves were stroke tested, operator parameters measured, documented
( as-found) and compared to the previously calculated values or setpoints.
Each valve was analyzed and the M0 VATS signatures retained for history.
The measured parameters were compared to the manufacturer's settings and thrust values required to ensure proper operation based on design differential pressure.
Using this procedure, the
ATTACHMENT l
Motor-0perated Valve Common Mode Failures IE Bulletin 85-03 Pcge 2 of 2 I
torque switch settings were adjusted as required.
Concurrence was obtained by Engineering from the valve manufacturer to make the adjustments, and the final settings were. documented (as-lef t).
For valves, 2CHS*M0V289, 2CHS*MOV373, and f
2CHS*LCVB, D,, the valves were changed from torque switch seated to limit switch j
seated based on the manuf acturer's recommendation and system design.
Response to Action Item (c)
As identified in Item (b), corrective maintenance procedure CMP-2-75M0 VATS-21E was used to verify that valve switch settings were properly implemented.
Preoperational testing, using Special Test Procedures and Temporary Operating Procedures, along with testing before, during and after Hot Functional Testing, verified the operability of each valve.
Each valve was tested to the extent practical under differential pressure conditions.
Table 3 identifies the differential pressure to which the valves were opened or closed against, depending on the valve operation on safety signal.
Although the valves were not tested at design differential pressure, the test pressures identified and the parameters measured at this differential pressure (running current, stroke time, etc.), are considered sufficient for satsifying the l
requirements of Item (c) of the Bulletin for demonstrating valve operability.
Response to Action Item (d)
Switch settings are set to obtain the desired thrust in order to l
operate the valve under design basis conditions.
The established open/close 1
torque switch, torque bypass, position limit, motor parameters and stroke time requirements are included in the BVPS-2 corrective maintenance procedures.
l Recording of these performance parameters is required for the "as found" and j
the "as left" conditions to ensure that the established performance parameters are achieved for the valves listed in Table 1.
Revisions to an'y switch setting will be determined based on engineering evaluation and approval.
Response to Action Item (f) l l
The program for addressing IE Bulletin 85-03 has been completed.
l Table 4 provides a sunmary of the results of testing using MOVATS equipment, j
identifying the as-found and as-lef t settings for each of the valves.
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" Beaver Valley Power Station, Unit No. 1 and'No. 2 BV-1 Docket No. 50-334, License No. DPR-66 BV-2 Docket No. 50-412 IE Bulletin No. 85-03 Page 2 bec:
J. J.
Carey J. D. Sieber J. O.
Crockett N. R. Tonet W.
S. Lacey H. M. Siegel C.
E. Ewing K. D. Grada L. G.
Schad E. D. Coholich J. V. Vassello D. R. Carothers S. M. Hovanec E. Lauck W.
R. Bacher W. V. Pfrommer J.
C. DiPerna F. J. Lipchick (CTS)
R. E. Martin J. A. Hultz T. P. Noonan R.
J.
Swiderski M.
J. O'Neill G. L. Beatty J.
F. Kowalski W.
F. Wirth G. A. Kammerdeiner B.
Zini S.
A. Nass F.
J. Mantine R. Snyder J. M. Riddle W. Hartley i
A. M. Moody I
J. Lee, Esq.
D. E. Burke (CEI)
J. J. Waldron (CEI)
B. M. Miller (2) (OEC)
T. Gerusky (PADER)
J.
Silberg (SPPT)
C. Richardson (S&W)(5)
J. N. Steinmetz (W)
J. M. Gribsby (W)
BV-2 NCD-SEG/ Phase II PUC Audit Distribution PLR-378 (4)
NCD File I
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