ML20206P863
| ML20206P863 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 04/15/1987 |
| From: | Fisher R PAUL-MUNROE HYDRAULICS, INC. |
| To: | Taylor J NRC |
| References | |
| REF-PT21-87, REF-PT21-87-077-000 0249E, 249E, PT21-87-077-000, PT21-87-77, NUDOCS 8704210282 | |
| Download: ML20206P863 (9) | |
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f Teecaxe 15 April 1987 Mr. James Taylor Director of the Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555
Subject:
Potential 10CFR21 report regarding pressure switches.
Reference:
1.
Letter from Control Components, Inc. to Paul-Munroe dated 25 March 1987.
2.
Bechtel/ Houston Lighting and Power Deficiency Evaluation Report No.87-022 forwarded to Paul-Munroe on 26 March 1987.
Dear Mr. Taylor:
This letter is to notify you of our actions in response to the above listed reference
'l' which requests that Paul-Munroe investigate the cause of failure of six ITT Neodyn pressure switches used in the assembly of Valve Operator Systems manufactured by Paul-Munroe to determine if these failures are reportable under the provisions of 10CFR21.
We have been in contact with Mr.
Ed Baker and Mr. Kamalakar Naidu of the NRC relative to this issue since 25 March 1987.
Reference '2' adds solenoid valves, servo amplifiers and potentiometers to the list of components from these systems which were found to be inoperable when the Valve Operator units were installed on the Pressure Operated Relief Valves in the plant af ter having been in storage for two years.
Paul-Munroe technicians have been on site to supervise the installation and check out of the Valve Operator Systems.
The technicians have reported that the systems were installed without their protective enclosures and that they were dirty and wet from oil and water.
The hydraulic fluid within the systems was found to be heavily dirt contaminated.
During check out, the components which were found to be inoperable were replaced.
At completion of check out, the Valve Operators were tested and deemed to be in operating condition.
8704210282 870415 DR ADOCK 05000498 dg PDR TI INSTALLATION SERvlCE MANUFACTURING COMPON EN TS SYSTEMS U
Mr. James Taylor U.S. Nuclear Regulatory Commission 15 April 1987 Page Two Three pressure switches and two servo amplifiers have been returned to Paul-Munroe from the South Texas Project for evaluation and this effort is currently ongoing.
The pressure switches were taken to the manufacturer's facility by the undersigned and Mr. Kamalakar Naidu of the NRC for test and evaluation.
It is expectea that the evaluation process will take approximately thirty days.
Preliminary findings indicate that the pressure switches failed due to particulate contaminates found on the diaphragms of the switch interface to the hydraulic fluid medium.
The servo amplifiers will be returned to the manufacturer for analysis.
In addition, Paul-Munroe has now received four Valve Operators for the Pressure Operated Relief Valves from the South Texas site to be completely overhauled in accordance with the Paul-Munroe recommendations for five year service.
Our initial inspection of these units indicated that two of the servo potentiometers wre mechanically damaged.
These studies and the valve operator overhaul are expected to be complete in approximately thirty days at which time Paul-Munroe will file a complete and final report.
Respectfully submitted, PAUL-MUNROE INCORPORATED Energy Products Division Richard C. Fisher Director of Engineering Attachments: Reference 1.
Letter from Control Components and 2.
Bechtel/ Houston Lighting Deficiency Evaluation RCF:ked 0249E SERVICE SYSTEMS INSTALLATION M ANUF ACTURING COMPONENTS
o 0 0 TDLOCOPY 0 0 0 Control COTiper.;.iLi inc.
AnIMIvalvecompany 3647 5.0 Mem SpoetIMne.CaMeme San 4 Tow $one(M4)e004e00 IslesSH400 FAX (714) 660-1534 (Direct)
DATg March 25, 1987 Paul-Munroe Hydraulics FM h.
To:
j Atta Ms. Roseanne Costello cc Mr. Paul Gant 2N
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Houston Light 6 Power l
South Texas Project REF:
This telecopy confirms our earlier telephone conversation on this date.
t We have received a nonconformance report from the South Texas site which indicates that 6 of 8 pressure switches on the PMi Eleccro-Hydraulic operators have failed.
'! hose failures are described as internal rupturing. We believe your service personnel may be aware of some of the details of these failures.
We have been advised that these failures have been reported to the NRC as potential difficiency under 50.55E'.
CCI request that Paul-Munroe review these failures to determine if they are reportable under 10 CPR 21. We request that you advise us the results of your investigation by 3/26/87.
Best Regards, E.J. Villaiva NOTE: If this tranetnission is not clear, please call our main phone number in Irvine (714) 660-1600, Ext 340.
Our equipment is a Group !!!, Automatic Rapioca 3300.
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Control Components Inc.
AnBGvalvecompany 2567 S E. Mein Sweet. Irvme. Caklomie 92714 Te+ phone (714) 0001400 Telen 68 5600 FAX (714) 660-1534 (Direct)
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If this transmission is not clear, please call our main phone number in Irvine (714) 660-1600, Ext 340.
Our equipinent is a Group III, Automatic Rapicom 3300.
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Dameristian of Def teianar pressYre switahes for the main stem eewer Operated Relief Valves (PORV s) ruptured internally. These stessure switches, one low pressure switch and one high pretoure switch for each PNV start /stop the hydreulic pump meter to maintain operating pressur,e for the PORV actuator hydraulic circuit.
Theruptured! ting.
ressure switches were initia110 discovered du Functions) Te Hydraulic fluid ses not' cod at the condui connection of one of the pressure switches. Within a period of two
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I weeks five eddittenal switchen were discovered to be leaking at the s ee point.
An on-site bench test was perfereed b representativeenpressureswitchA1MS-P$N.14!yaPaulMunroeservice
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frem the contact enclosure, the switch was pressurised with hydraulic i
fluid. At 1000 PS!8 the Vdraulic f1Jid was observed to leek around the pressure switch stem inside the conta:t enclosure. This es leakage through the conduit connection observed initially. plained the Time restraints imposed upon the Paul Munrae servise representative prevented further testing te verify if the swit:h contacts would make/ break at the l
l' sperating set point.
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From further investigstion of the pressure switch probles, it was found l
l that additional PORV actuator hydreuils cirtuit congenents have failed.
i the fellow'ne is e list of these hydenJ14e circuit components that have l
l failed 'nc'uilng the pressure switthei discussed in the preceding paragraphs.
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BIR3.rY.74E1 M(A High PressV7f Switch 81MS.P5H-7421 l
Lew Pressurc $*1tch 81MS-P5L-7421 C1MS PV.7431 Serve Amplifier i
CIMS.PY-7431 Potentieseter N/A 3
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01MS-PV.7441 serve Applifier 01MS-PY.7441 i
Low Pressure Switch 01MS-PSL.7441 t
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A1MS.pV.7411, 81MS-PV 7421, CIM3-PV-7431 and 01M PV.7441.
Corrective Action The items that have fatled have been oplaced via Startue Work Requests. Nonconfermance Reports have seen issued for the pressurg switches (NCR SJ-03470)5) serve empliflors (NCR $
and p0RV bonnet i
seal rings WCA 5P 0470. These NCR's will be diseosit furtheravs[untionbyApril 30, 1987.
!!!. Recurrence control i
i The root cause for these multiele failures is not known et present.
Site Engineering has been in contact with Paul Munroe Hydrauli the supp1ter of the 70RV estuators. to evaluate the problems. cs Inc.,
It is planned to return semeles of the pressure switches and serve amplifier cards for evaluation by March 20, 1987 In addition of the 70RV's will be reeuested to respond for the ne. the prime supe 11er ed to torque bonnet nuts and replace tennet gaskets by April 30,1987 IV.
Safet_v Analys14 Mrdraulic fluid 4
cTese position. pressure is requirod to stroke the p3RV to the open era less o c pressure throveh a pressure switch.
rupture starts the hydraulic p ap motor en low preslure to re.aressurite she system and se prevent the tydreultu assumuistor (nttrogen 4narget)
I from being deeleted.
Upon reaching the high pressure switch set point.
the motor will stop.
between start During this concition with the motor cycling reservoir Leve/stop to maintain hydraulic pressure the hydraulic lwilleventuallydroptelowtheseIpointofthe1ew.
level switch as the hydrevlic fluid is lost throvah the switch rupture.
The level switch is e eusp start permissive end the meter will be unable to start once the low level sendition is reached.
The estmuister is 1selsted by solenoid valve AIM 3-PY.7411C at 1800 Pl!G decreasing and will de enerstne te open only en lost of OC power to the solene'd er when the preisure reaches 1400 P518 en increasing pressure if~ the pump is running to pressuriae the system. The operater is provided with the means to move the valve with a hand pug during maintenance er less of power to the pump meter.
The affects en the PORY operation from the other hW raulic circuit components that failed are varted.
The two solenend valves A1MS.P) 7411A and A1MS PY-74118 hydraulic fluid to either open o. are directtenal valves for.the r close the PORV.
The solenoid valves
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Thepotentiometer(valveposition transducerD provides volve position feedback to the remotely located serve-emp1Lfter.
The servo amplifier compares the feedback signal with the incoming 4 to to milliamp comand signal to the servo.ampl' fier from QOPS and generates a signal to centrol the two solenoid valves A1M5 PY.7411A and A1N5.PY.74118 until the valve position corresponds with the incoming coesnd signal.
In swanary failure of any of these components affects the operation and reliabi1Ity of the p0RV.-
The PORV's and associated pressure costrels provide the capability for 4 controlled plant coeldown when the Turbine B.vcass System (T85)Syst is not 1
available.
During abnemal operation model of the Main Steam the PORV's are opened to the atmosphere to remove decay heat from the steam senerators in the event the T85 is not available.
In the event the PORV's cannot relieve the steau f a the steen ponerators, the main steam ssfety relief valves progressively open to re teve the steam to the atmosphere via vent stacks without over-pressurtzing the steam generators.
This incident is potentially reportable under 10CFA50.55(e). Further evaluation is necessary.
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