ML20214P489
| ML20214P489 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 09/15/1986 |
| From: | Andrews R OMAHA PUBLIC POWER DISTRICT |
| To: | Martin R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| IEB-85-003, IEB-85-3, LIC-86-465, NUDOCS 8609230187 | |
| Download: ML20214P489 (5) | |
Text
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. L5 U L {5? 3 Omaha PubHC Power District a Fc-l FJi Fi\\\\/
1623 Hamey Omaha. Nebraska 68102-2247i LS 402/536 4000 4
September 15, 1986
$[pl8[g86 LIC-86-465 3
Mr. Robert D. Martin 1 4, Regional Administrator U.S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, Tx. 76011
References:
1.
Docket No. 50-285 2.
IE Bulletin No. 85-03, " Motor-0perated Valve Common Mode Failures During Plant Transients due to Improper Switch Settings," dated November 15, 1985.
3.
Letter OPPD (R. L. Andrews) to NRC (Document Control Desk) dated May 15, 1986 (LIC-86-224) 4.
Letter NRC (J. E. Gagliardo) to OPPD (R. L. Andrews), dated July 30, 1986, (NRC-86-0245)
Dear Mr. Martin:
Response to Request for Additional Information The Omaha Public Power District received Reference 4, requesting additional information regarding the OPPD program to accomplish Action Items b through d of Reference 2.
Specifically, the step-by-step program to verify the switch settings was not described. OPPD provided our proposed response informally to Region IV personnel and a telephone conference was held.
This was done to en-sure that the program description was responsive to the request for additional information. Minor additions were made as a result of the telephone call, which are reflected in the attachment to this letter.
If you have additional questions concerning this matter, please do not hesitate to contact us.
Sincerely, G.$ w Ed. f t
8609230187 860715 R. L. Andrews PDR ADOCK 05000285 Division Manager G
PDR Nuclear Production i
RLA/me Attachments cc: LeBoeuf, Lamb, Leiby & MacRae 1333 New Hampshire Ave., N.W.
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Washington, DC 20036 G
Mr. D. E. Sells, NRC Project Manager g g
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Mr. P. H. Harrell, NRC Senior Resident Inspector egDG-NRC Document Control Desk
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UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION In the Matter of
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Omaha Public Power District
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Docket No. 50-285 (Fort Calhoun Station
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Unit No. 1)
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AFFIDAVIT R. L. Jaworski, being duly sworn, hereby deposes and says that he is authorized to act as an alternate to the Division Manager - Nuclear Production of the Omaha Public Power District; that as such he is duly authorized to sign and file with the Nuclear Regulatory Commission the attached additional information relative to IE Bulletin 85-03; that he is familiar with the content thereof; and that the matters set forth therein are true and correct to the best of his knowledge, information and belief.
R. $.
U R. L. Jaworski - authorized alternate to Division Manager Nuclear Production STATEOFNEBRASKA)
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ss COUNTY OF DOUGLAS)
Subscribed and sworn to before me, a Notary Public in and for the State of Nebraska on this _/L-ra day of September,1986.
AAM W W so m ste W e m ans Notary Public~
M lir k N sus 4
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ATTACHMENT The valves defined within the scope of the Bulletin were identified as HCV-311, HCV-312, HCV-314, HCV-315, HCV-317, HCV-318, HCV-320, and HCV-321. The valves within the scope of the Bulletin function in the high pressure safety injection system. The following steps outline the steps taken and to be taken to imple-ment a program at OPPD to accomplish Action Items b through d of the Bulletin.
1.
In September of 1985 Limitorque Corporation was contacted and request-ed to provide the design thrust opening and closing the valve for each of the valves to be tested during the 1985 refueling outage. Using the data provided by Limitorque and with the assistance of MOVATS personnel, a procedure was established which was used during the 1985 outage.
2.
Through the use of the M0 VATS System each valve was tested for correct switch settings. Testing of each valve included:
A.
Verification of the valve operator - Each valve was inspected to verify the Limitorque purchase order and serial numbers supplied by OPPD to Limitorque Corp. were accurate and that the wiring of the operator matched the current wiring diagram.
B.
Torque Switch Balance - The displacement of the spring pack was measured with the torque switch setting the same in the open and close directions.
If the torque switch was out of balance, the switch was balanced if it had the manufactured balancing capabil-ity.
For valves without the balancing capability the test was continued to determine if the target thrust open and close could be achieved.
If the target thrust could be achieved, the torque switch was left as is and the testing completed.
If the target thrust could not be achieved, the torque switch was replaced.
NOTE:
For the eight valves defined within the scope of the Bulletin, seven of the eight valves did not have the manufactured balancing capability. However, all seven did achieve the target thrust open and close, and thus were not replaced.
C.
Setting of the open and close torque switch - The nominal thrust in the open and close directions were calculated to be the mini-mum design thrust (supplied by Limitorque) plus 25%. The target thrust was +10% of the nominal value.
The settings were then changed to achieve the target thrust.
D.
Verification of proper torque switch bypass limit - The stroke time from disk unseating was measured and the torque switch bypass limit was set at 10 to 15% of the stroke time.
E.
Adjustment for backseating - Each valve was monitored to detect any backseating.
If backseating occurred, the switches were adjusted to correct the problem.
For the two valves that were found to be backseating, no degradations (e.g., damage to valve housing, bent stem, etc.), were noted in the M0 VATS analysis reports.
1
' Attachment (Crntinued)
F.
Monitoring of the motor current - The motor current was monitored while the valve stroked open and close.
Each trace was noted for any unusual in-rush or high running current.
NOTE: All valves tested were found to have no significant in-rush or high running current.
G.
Further analysis of the signatures - Each portion of the test developed a trace that was stored on a bubble memory and sent to M0 VATS Inc., for further analysis. The test results were then reviewed and any corrective action recommended were taken.
i A summary of the results is found in Table 1.
3.
A procedure for the use of the MOVATS MCC Test System to determine the threshold value at no-load conditions will be written. The procedure will be performed during the 1987 refueling outage.
4.
During the 1987 refueling outage currently scheduled for March of 1987, the baseline data that was collected during the 1985 outage, (as detailed in Item 2 above), will be verified by monitoring the stroke of the valve with the M0 VATS system.
5.
Through the use of the MOVATS MCC test system, the valve will be monitored at the MCC to determine if the threshold value is being exceeded while there is pressure across the valve.
-e s
i TAILE 1 Found valve Open/Close Found/Left Final Unseating Bypass Found/Left Hitting Valve Operator Valve Target Thrust Torque Switch Thrust (a)
Stroke Margin Sypass Sack ~
Inftrmation Information Information Minimum-Manimum
-SETTING OPEN/CLOSE TIME MIN / MAX MARGIN SEAT ID 0 HCV-311 Manuf Limitorque Volts 480 Op: 1192b-54575 Ops 4.0/1.2 12720/
8.090 0.809 0.790/1.110 No Manuf Velan Type SMS Amps 4.0 CI: 11925--14575 CI: 2.0/1.0
-12020 1.214 Type Globe Size 00 RPM 1700 Sizo 2*
Serlais 99889A Hp N/A As found close 21000s System SI-HP Orders 337597A
_=====_ _ =-_
ID # HCV-312 Manuf Limitorque volts 460 09: 11925--14575 09: 1.0/1.9 12020/
8.245 0.825/
1.700/1.120 No Manuf Velan Type SMS Amps 4.0 CI: 11925--14575 Cl 1.0/1.75 12780 1.237 Type Globe Size 00 RPM 1700 Sizo 2"
Serials 99892A Hp N/A As found close 5000s System SI-NP Orders 337597A
=---
._-.-,--_______.___-=_:=.--
ID 8 HCV-314 Manuf Limitorque volts 460 Op: 11925--14575 Op 3.75/1.75 12960/
7.930 0.793/
O.795/0.975 No Manuf Velan Type SMS Amps 4.0 C1: 11925--14575 Cl 1.75/1.0 12282 1.190 l
Type Globe Size 00 RPM 1700 As found Stzs 2"
Serials 99886A Mp N/A close: 17074s System SI-NP Orders 337597A
~~~-------- =- -- - - = - - - - - - - - - - - - ~ ~ ~ - - - = = - - - - - - - -
ID e HCV-315 Manuf Limitorque Volts 460 Ops 11925--14575 Op 4.0/1.6 12700/
8.200 0.820/
0.445/3.050 Yes
==.--..--.-------__.
Manuf Velan Type SMB Amps 4.0 CI: 11925--14575 CI: 2.0/1.6 13240 1.306 Type Globe Size 00 RPM 1700 As found Size 2"
Serials 99890A Hp N/A close: 17705 System SI-HP Orders 337597A
-.. __ ___== __-
= _ _ - -_.----.--............--..---...
ID # HCV-317 Manur Limitorque volts 46Q Op: 11925--14575 Ops 4.0/1.5 12220/
7.630 0.763/
0.830/0.830 No Manuf Votan Type SMS Amps 4.0 CI: 11925--14575 CI: 2.0/1.5 12100 1.145 Type Globe Size 00 RPM 1700 As found Size 2*
Serials 99885A Hp N/A close: 16683 System SI-HP Orders 337597A
=----..----__-__-__ --- __
=.--------------------------------.--
ID # HCV-318 Ma u Limitorque Volts 460 Op 11925--14575 Op 4.0/2.0 12140/
7.660 0.766/
0.945/0.945 No Manuf Velan Type SMS Amps 4.0 CI: 11925--14575 CI: 1.5/1.0 12660 1.149-Type Globe Size 00 RPM 1700 As found l
Size 2"
Serials 99888A Hp N/A close: 13257 l
System $1-HP Orders 337597A
_ _ - _ _ -_-=__=___
_ _ - _ _ - - - - - _ = - = = __-__
l ID # HCV-320 Manuf Limitorque Volts 460 0p: 11925--14575 Op 3.5/2.0 13120/
7.550 0.755/
?.290/3.040 No Manuf Velan Type SMS Amos 4.0 CI: 11925--14575 Cl 2.5/1.6 12580 1.133 Type Globe Size 00 RPM 1700 As found Size 2"
Serials 99887A Mp N/A close: 16466 System SI-HP Orders 337597A
=___ _.
Volts 460 Op: 11925--14575 Op 4.25/2.75 12260/
8.185 0.819/
0.740/1.215 Ves ManufL$mitorque l
Da HCV-321 Manuf Velan Type SMB Amps 4.0 CI: 11925 -14575 Cl: 2.25/2.5 12980 1.228 Type Globe Size 00 RPM 1700 Stro 2"
Serials 99891A Hp N/A As found close: 10900 l
System SI-HP Orders 337597A
==_
--= -__ --.--..---..--.---....
1 NOTE 1: The eight valves defined within the scope of the bulletin have a circuitry'that limits out in the open direction and torques out in the close direction. The as found condition of the torque switch for the open circuitry will not affect the valve unless an obstruction is encountered. Per analysis reports provided by MOVATS. no degradations were noted on '
the two valves that were found.to be backseating.
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