ML20097G205
| ML20097G205 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 08/28/1984 |
| From: | Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| OL, SDR-151, NUDOCS 8409190334 | |
| Download: ML20097G205 (4) | |
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'84 SEP 10 A'136 Mr. Thomas E. Murley, Director Office of Inspection and Enforcement - Region.I.
United States fisclear Regulatory Comnission 'l -
631 Park Avenue King of Prussia, PA 19406
Subject:
Limerick Generating Station, Units 1 and 2 Final Significant Deficiency Report No. 151 Damaged Spray Pond Sluice Gate Stems NRC Construction Permit Nos. CPPR-106 and 107
Reference:
Telecon - P. K. Pav11 des /PECO to J. Grant /NRC dated August 20, 1984 Flie: QUAL 2-10-2 (SDR No. 151)
Dear Mr. Murley:
In convilance with 10CFR50.55e, enclosed is the final report on
, the subject deficiency. Your office was informed of this l matter on August 20, 1984, by the referenced telecon.
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\ Sincerely, N
f' CSM/ dun /08218401 l Attachnent fCopyto: Director of Inspection and Enforcement United States Nuclear Regulatory Conmission Washington, DC 20555 l
S. Chadhary, Resident NRC Inspector (Limerick)
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i 8409190334 840828 PDR ADOCK 05000352 s PDR
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cc: Judge Lawrence Brenner Judge Peter A. Morris Judge Richard F. Cole Troy B. Conner, Jr., Esq.
Ann P. it,dgden, Esq.
Mr. Frank R. Romano Mr. Robert L. Anthony i Maureen N111gan Charles W. Elliot, Esq.
Zori G. Ferkin, Esq.
Mr. Thomas Gerusky Director, Penna. Emergency Management Agency !
Angus R. Love, Esq.
David Wersan, Esq. {
Robert J. Sugarman, Esq.
Martha W. Bush, Esq.
Spence W. Perry, Esq.
day M. Gutierrez, Esq. :
J Atomic Safety & Licensing Appeal Board Atomic Safety & Licensing ,f' Board Panel l
-Docket & Service Section Mr. James Wiggins Mr. Timothy R. S. Campbell l
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2840805250 l
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Limerick Generating Station, Units-1 and 2 Significant Deficiency Report - SDR No. 151 Damaged Spray Pond Sluice Gate Stems NRC Construction Pennit Nos. CPPR-106 and 107 Introduction This is the final report concerning a deficiency in the performance of the spray pond sluice gate stems. The subject sluice gates and operating stems were supplied by ARMCO Steel Corporation and installed in the spray pond punp house by Bechtel Power Corporation.
Description of Deficiency:
During testing of the sluice gates, the stems used to raise and lower the gates were bent on two of the five gates. The damage to both stems occurred as the gates were being seated in the fully closed position. The specification for the sluice gates (C-88) requires t, hat the stems be able to withstand the full thrust developed by the motor operator without being damaged.
Corrective Actlon:
The two damaged stems have been removed and new stems procured and installed. Review of the system showed that the operators develop equal thrust in both the opening and closing direction, but the thrust required to close the gates is significantly less than that required to open the gates. To prevent the operator from delivering excess force to the stems during gate seating, a ilmit switch has been added in series with the torque switch on all five operators. Work is presently under way for the addition of washers under the stem guide support brackets to increase their holding area. Prior to Septent>er 15, 1984, all work on the guide support brackets wl11 be conpleted along with adjustments in the torque switch settings and the Installation of pipe locks on the stems to prevent overstr'ess of the
. stems during manual operation.
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,. .'c 2840805250 Safety Imp 1IcatIons The spray pond sluice gates are normally left in the open position allowing the Emergency Service Water (ESW) ptnps and the Residual Heat Removal (RHR) purps to take suction from spray pond during an emergency. During nonnal plant shutdown, the gates can be closed allowing the water from the cooling towers to be used for the RHR system. If an accident should occur at this time, the sluice gates are required to autcmatically open to allow the ESW and RHR puros to take suction from the spray pond.
If the situation had gone uncorrected, it would have been possible for one or more of the stems to bend during gate closure and prevent the gate from reopening during an emergency.
The trodifications made to the rrctor operators and the stem guide brackets will allow the stems to withstand the full thrust developed by the operators without bending.
CSM/dnn/08178402 l
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