ML20210U153
| ML20210U153 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 01/04/1985 |
| From: | Spessard R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Norelius C NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML20210T938 | List: |
| References | |
| FOIA-86-266 NUDOCS 8606020189 | |
| Download: ML20210U153 (7) | |
See also: IR 05000255/1983074
Text
{{#Wiki_filter:.. . - _ _ _ _ _ _ _ _ _ _ . pa4G UNITED STATES NUCLEAR REGULATORY COMMisslON e . [jii( k REGION lH 5~' -f 799 ROOSEVELT RO AD . o, a cten stovu. ittinois saisi - ' pd y JAt; 41%5 ~? , MEMORANDUM FORT C, E. Norelius, Director, Division of Reactor Projects FROM: R. L. Spessard, Director, Division of Reactor Safety SUBJECT: REQUEST FOR ASSISTANCE (EVALUATION OF LER 50-255/83-74 FORPALISADES) AITs F03050984 Per your request, we have evaluated the safety significance of the Palisades ' Nuclear Plant Min steam safety valve .high lift settings reported by LER 50-255/83-74. The original problem occurred in 1981 when the licensee changed from in place testing of the i;afety valves, using a special test rig to off site testing using actual steam conditiens to detennine valve setpoint. The technique in 1981 resulted in erroneously adjusting the valve spring tension . ' that resulted in the high setpoints. Modification of the test rig end corresponding improvement in technique (in 1983) resulted in discovering the problem and returning the valve springs to their pre 1981 tension. The licensee . nalysis' of the four over pressure transients which challenge the a safety valves concluded that the plant was not in an unsafe condition due to the improperly set valves. We have.r.nyiewed this analysis,and find no dis 3_3r_eement with it. However, the original circumstances thatT~d t6~this ~ test the valve w noints event do represent a failure by the licensee to properly _fitTother events, and intgrpret_thg_tett data. T h even twhen consicr eIL such as the recent reactor coolant pump f ailbre, might rep ~ resent a weakness in ind/or~teclihEal capabilitf in testing and ~ t_heyensee's program, cominkd{k . mainta1ning_gquipmtntTquality,. g /;jg, Our conclusions on this matter are based on a review of the LER, Consumers Power Company evaluation of the safety significance of the event, the licensee's internal documentation of this event in Report No. E PAL-83-204, and related FSAR material; and, an onsite interview with the mechanical maintenance supervisor, Brain Low. < If you have any questions on the details of our evaluation, contact P. R. Wohld, extension 596. i x >%rL R. L. Spessard, Director Division of Reactor Safety ' cc: G. C. Wright ~W, DeShefer E. R. Swanson i 8606020189 860516 , PDR FOIA MURPHY 86-266 PDR . aM - . ._ _. . _ .
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. .. . A. EQUIPMENT STATUS (FOLLOWS TABLE 5.1 IN NUREG 1154) TROUBLESHOOTING / ROOT CAUSE ITEM DETERMINATION ACTIVITIES COMMENTS RIII ACTIONS 1. Main Feedwater Cause determined to be component MFPs were tested on 09/05- Region III is monitoring Turbine failure in speed control circuit. 06/85 with no problems noted. licensee evaluation of Revised report issued 08/30/85. reliability of the MFPs. 2. Closure of MSIVs** Cause determined to be that circuit More testing will be scheduled RIII monitoring licensee's was overly sensitive to momentary later. Specialist from NRR activities and observing system perturbation. Revised will observe testing as selected activities. report issued 10/03/85. Trouble- required. shooting now in progress should not effect root cause determination. l 3. Steam Safeties,** Defective electronic module in Remaining ten MSSVs have been ' Atmos. Vents. ICS likely cause of problem with removed, six have been shipped RIII following licensee atmospheric vent valves. Revised to Wylie for full flow steam activities. Vendor report issued 10/03/85. MSSVs testing. Six remain to be Programs Branch has been being evaluated. shir ped including two spares. notified of testing. , The valves will be modified j as recommended by Dresser. 4. Aux. Feedwater Turbine Cause considered to be condensation Preparations are being made to RIII inspectors to observe ' in long steam inlet lines. Revised modify the steam supply system. activities. report issued 09/16/85. Governor from #2 AFWPT has been j removed and sent to Woodward ) i along with two spare governors for inspection and modifications. '
Governor for #1 AFWPT is being replaced with a new governor.
! 5. AFW Containment Causes were incorrect torque switch Additional dp and flow testing RIII following licensee ' Isolation Valves bypass settings and inadequate test is being evaluated, activities. 4 and maintenance procedures. Revised report issued 08/29/85. i
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.. _ _ _ __ . . , s l A. EQUIPMENT STATUS (FOLLOWS TABLE 5.1 IN NUREG 1154) i' I TROUBLESHOOTING / ROOT CAUSE '
ITEM DETERMINATION ACTIVITIES COMMENTS RIII ACTIONS
-1. Main Feedwater Cause determined to be component MFPs were tested on 09/05- Region III~is monitoring ' Turbine failure in speed control circuit. 06/85 with no problems noted. licensee evaluation of Revised report issued 08/30/85. reliability of the MFPs. , ! 2. Closure of MSIVs** Cause determined to be that circuit More testing will be scheduled RIII monitoring licensee was overly sensitive to momentary later. Specialist from NRR activities and observing ' system perturbation. Revised will observe testing as selected activities. report issued 09/07/85. Trouble- required. shooting now in progress should not ' l effect root cause determination. 3. Steam Safeties,** Defective electronic module in Remaining ten MSSVs have been Atmos. Vents. ICS likely cause of problem with removed and will be shipped RIII following licensee I atmospheric vent valves. Revised to Wylie for full flow steam activities. report issued 09/06/85. MSSVs testing. Vendor Programs
being evaluated. Branch has been notified. 4 4. Aux. Feedwater Turbine Cause considered to be condensation Preparations are being made to RIII inspectors to obser in long steam inlet lines. Revised modify the steam supply system, activities. report issued 09/09/85. Governor from #2 AFWPT has been .1 ' removed and sent to Woodward along with two spare governors ! for inspection and modifications. ! Governor for #1 AFWPT is being replaced with a new governor. i 5. AFW Containment ** Causes were incorrect torque switch Additional dp and flow testing RIII following licensee l Isolation Valves bypass settings and inadequate test is being evaluated. activities. ! and maintenance procedures. Revised
report issued 08/29/85. i ! 6. Steam Supply Valve ** Co.npleted and revised report Activities completed. RIII to observe any i to AFPT No. 1 issued 09/09/85. Valve will be Additional testing additional testing. inspected internally with a is planned in hot
borescope. standby. I 2 ! . < i ! , c - - - - - -
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A. EQUIPMr TATUS (F0LLOWS TABLE 5.1 IN NUREG 1154) ' TROUBLESHOOTING / ROOT CAUSE ITEM DETERMINATION ACTIVITIES COMMENTS RIII ACTIONS- ' 1. Main Feedwater Cause determined to be component MFPs were tested on 09/05- Region III is monitoring Turbine failure in speed control circuit. 06/85 with no problems noted. licensee evaluation of Revised report issued 08/30/85. reliability of the MFPs. 2. Closure of MSIVs Cause determined to be that circuit Testing will continue through RIII monitoring licensee's ' was overly sensitive to momentary next week. Specialist from activities and observing system perturbation. Revised NRR will observe testing as selected activities. report issued 09/07/85. Additional required. ' ' root cause determinations are ' continuing. 3. Steam Safeties,** Defective electronic module in Seven of Eight MSSVs shipped RIII following licensee Atmos. Vents. ICS likely cause of problem with to Wylie for full flow steam activities. atmospheric vent valves. Revised testing and internal inspec- report issued 09/06/85. MSSVs tion failed. The seven are being evaluated. being reset by the manufacturer. Ten additional MSSVs are being removed and tested onsite. 4. Aux. Feedwater Turbine Cause considered to be condensation Preparations are being made to RIII inspectors to in long steam inlet lines. Revised modify the steam supply system. observe activities. report issued 09/09/85. Governor from #2 AFWPT has been removed and sent to Woodward along with two spare governors for inspection and modifications, t Governor for #1 AFWPT has been replcced with a new type governor. , t Cem leted and revised report issued Additional dp and flow testing RIII following licensee's 5. AFW Containment p ! Isolation Valves 08/29/85. Misadjustment of bypass is being evaluated. activities. 1 torque switch settings and ,
inadequate testing procedure.
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Steam Supply Valve No cause was identified. Revised Activities completed. RIII to observe any ' to AFPT No. I report issued 09/09/85. Additional testing additional testing, is planned in hot i standby.
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. . . s . ' ' EQUIPMENT STATUS (FOL' TABLE 5.1 IN NUREG.1154) TROUBLESHOOTING / ROOT CAUSE ITEM DETERMINATION ACTIVITIES COMMENTS RIII ACTIONS 1. Main Feedwater Cause determined to be component MFPs were tested on 09/05- Reglen III is monitoring Turbine failure in speed control circuit. -06/85 with no problems noted. licensee evaluation of Revised report issued 00/30/85. reliability of the MFPs. 2. Closure of MSIVs Cause determined to be that circuit Testing will continue through RIII monitoring licensee's was overly sensitive to momentary next week. Specialist from activities and observing system perturbation, Revised NRR will observe tcsting as selected activities. report issued 09/07/85. Additional required. root cause determinations are continuing. 3. Steam Safeties, Defective electronic module in Eight MSSVs have been shipped 11111 following licensee Atmos. Vents. ICS likely cause of problem with to Wylie for full flow steem activities, atmosphere vent vaIves. Revised testing and internal inspec- report issued 09/06/852 MS$Vs tion. Vender Prografns Branch i being evaluated, will ba cbserving tho testing activi t-ies. _ 4 Aux. Feedwater Turbine Cause considered to be condensatian Preparations are being made tc RIII inspectors to In long steam i.nlet lines. Revised snodify the steam s'upply system. observe activities, > report iswed '09/09/85. Governor from 12AFWPT has been reinoved and sent to Voodward along w-Ith two spare governers for inspection and modifications. Covernoe for #1AP#T nas been replaced with a new type governer. 5. 4.F4 Containent Cepler.ed und revised report issued Additicaal .dp a!1d flow testing RIII following licensce's Isolation Valves 08/29/55. Nisadjustment of bypass is being evaluated. activities. -
torque switch settings and i inade@dte testing procedure. S. Stem Supply Vaive Completed and revised report issued Activities completed. RIII to observe eny
tc. AFF7 No. 1 09/09/85. Additional testing additional testing. is planned in hot 1 standby. 2 . ,y. - ,- e- . . - . . , ,, - e.-,.c_-- - c- , . - - - , c y a .
F ~ ~' ' " ~~ ~ ~_~ ' ' " ^' ^ ' ' ~' ~ ~' ' ^ ^ ^ ' s - . . M 0!FMEN7 STATUS'(FOLLOWS TABLE 5.1 IN NUREC 1154) . 1ROUBLESH00 TING /R00T CAUSE L ITEM _ _ _ _ . DM ERFI?iATION ACTIVITIES COMMENTS _ _ R1II ACTIONS 1. Main Feedwater Turbine ** tause determined to be component MFPs were tested on 09/05- Region III observed failure in speed control circuit. 06/85 with no pechlems rioted. tests of MFPs and is > Completed and re:: ort sbnmitted to monitoring licensee MRR (08/.t6/85L evaluation of of reliability of the MFPs, ' Causs determi~ed'to be that circuit Testing will continue through RIII monitoring 2. Elosure nf M3IVs** n tras CVCFly sefisitive to stomenta'ry next week. Specielist from licensee's activities- g system perturbation. . Report NRR will observe testing as and observing' selected - stibmitted to NP.R (08/28/65). required. activities. Additional root cettse determinations r are conticuling. 3. Steam Safeties, Atmos. Defective efectronic module in Removal of eight MSSVs has RIII following Vents. ICS 1-ikely cause of problem with begun. The valves should be licensee activities. atmosphsre vent valves. Report shipped to Wylie the week of Vendor Programs Branch sent to NRR 08/25/85. MSSVs being 09/16/85 for testing. has been notified, evaluated. 4 Aux. Feedwater Turbine Cause co'nsidered to be condensation Preparations are being made RIII inspectors to in lo.ng. steam inlet lines. Report to modify the steam supply observe activities, submitted to NRR 08/31/85: system. Governor from
- 2AFWPT has been removed and
sent to Woodward along with two spare governors for inspection and modifications. 5. AFV Containment Completed and report submitted Additional dp and flow RIII following isolat' ion Valves to NRR (08/19/85). Misadjustment testing is being evaluated. licensee's activities. of bypass torque switch settings and inadequate testing procedure, , 6. Steam Supply Valve ** Completed and reported submitted Activities completed. RIII to observe any to AFPT No. I to NRR 08/17/85. Additional testing additional testing. is planned in hot standby. 2 . i. . . . .A ct.
.. - -- .. . - . - _- 1 . . .. EQUIPMENT STATUS (FOLLOWS TABLE 5.1 IN NUREG 1154) t TROUBLESHOOTING /R0OT CAUSE ITEM COMMENTS DETERMINATION ACTIVITIES RIII ACTIONS 1. Main Feedwater Turbine MFP's were tested on Cause detemined to be component Region III observed ' 09/05-06/85 with no failure in speed control circuit. tests of MFPs and is problems noted. Completed and report submitted to monitoring licensee NRR (08/16/85). evaluation of of reliability of the.MFPs. f2. Closure of MSIVs Testing will continue through Cause detemined to be that circuit RIII monitoring t next week. Specialist from was overly sensitive to momentary licensee's activities NRR will observe testing as system perturbation. Report and observing selected required, submitted to NRR (08/28/85). activities. Additional root cause deteminations are continuing 3. Steam Safeties, Atmos. Eight MSSVs will be removed Defective electronic module in RIII following Vents. - next week for offsite testing. ICS likely cause of problem with licensee's activities, atmosphere vent valves. Report Vendor Programs Branc'; ' sent to NRR 08/25/85. MSSVs being has been notified of evaluated. planned offsite testing 4. Aux. Feedwater Turbine Operational testing started Cause considered to be condensation RIII inspectors to Friday (09/06/85) in long steam inlet lines. Report observe testing. submitted to NRR 08/31/85. 5. AFW Containment Additional testing in progress Completed and report submitted RIII following Isolation Valves on AF608 to NRR (08/19/85). Misadjustment licensee's activities. of bypass torque switch settings and inadequate testing procedure. 6. Steam Supply Valve ** Activities completed. Completed and report submitted RIII to observe any to AFPT No. 1 Additional testing to NRR 08/17/85. additional testing. is recommended in hot standby. i i ! 2
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, . - - - - W?lD' - w - . ysh &- -: - Nuclear Information and Resource Service 1616 P Street, N.W., Suite 160, Washington, D.C. 20036 (202) 328-0002 April 10, 1986 AE on of Rules and Records [Q[Q g J g g Washington, DC 20555 FOIA REQUEST h=//-[[y , Dear Sir, I This is a request under the Freedom of Information Act, as amended, for the following information: (1) All internal NRC documents relating to IE Information k Notice No. 86-05, t 1 (2) all internal NRC documents related to the operability of main steam safety valves (MSSV), their safety, tested failures, ring setting adjustments; (3) all internal NRC documents concerning actions toward determining additional requirements for MSSV operability; (4) all internal NRC documents concerning actions toward designation of MSSV failure a high priority safety issue; (5) correspondence between the NRC and MSSV manufacturers concerning MSSV safety, maintenence instructions, and reliability. The information being requested will be used by interested members of the public and willte brought to the attention of members of Congress, NRC Commissioners and other state and local officials. Because no personal financial benefit will ensue, I hereby request waiver of the search and copy costs. I look forward toyour early response. Sincerely, M "'" " " ' " " " " " ' -86e$2go/3L- . }}