ML20086L391
| ML20086L391 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 01/30/1984 |
| From: | Watzl E NORTHERN STATES POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 8402080209 | |
| Download: ML20086L391 (13) | |
Text
__ - _______
Northern States Power Company Prairie Island Nuclear Generating Plant Route 2 I
Welch, Minne.ota 55089 January 30, 1984 PRINCIPAL STAEF fRA L DPRPv Cu [7 /
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Mr. James G.
Keppler A/RA 3%QZ/
j Regional Administrator - III RC UkMA U.S. Nuclear Regulatory Commission pao scs 799 Roosevelt Road SGA ML Glen Ellyn, IL 60137 ENF Filo A
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Dear Mr. Keppler:
PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket No. 50-282 License No. DPR-42 Docket No. 50-306 License No. DPR-60 i
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On January 26, 1984 Northern States Power Company, Prairie Island t
Nuclear Generating Plant was notified by the NRC of a potential lapse of quality control at the Hills - McCanna, Ramcon Actuators and Controls Division of Pennwalt Corporation (presently owned by Rockwell International).
An investigation was begun to determine the applicability of this issue at Prairie Island.
It was determined that P1 has 86 of the aforementioned actuators installed in safety related ventilation systems.
(See attached Table 1 for system identification and location.)
The actuators were supplied eith dampers as a unit from Pacific Air Products Company (PAPCO) in accordance with Pioneer Service and Engineerir.E Compan-/ (presently Fluor Engineering, Inc.) specifications Hiawatha 505, M1282 and M1283 and NSP Quality Procedure D-9 " Quality Assurance Requirements for Fabrication, Construction, Installation or Testing."
The following requirements for the actuator were imposed upon PAPCO:
1.
The time required to actuate air operated dampers shall not exceed 10 seconds.
Motor operated dampers shall open in 30 sec (+10, -5).
d" M 8402080209 840130 PDR ADOCK 05000282 S
PDR 1
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FEB 1
January 30, 1984 Page 2 of 5 2.
All damper operators shall be suitable for mounting in any position and be air to open and spring to close or spring open and air to close without positioners except as noted.
Shield Building Vent dampers shall have modulation capability (DC motor operated).
3.
Clean dry instrument air will be furnished by NSP at 85 psig.
4.
Operators shall be selected which shall close the damper within the specified time limit yet provide for a cushioned seating so as not to damage the seals.
5.
Items designated as Quality Assurance Type 1 and 11 shall be analyzed for seismic accelerations.
The
' analysis shall be made on the assembly (damper and actuators) as a whole.
6.
Subcontractors and suppliers shall be selected
_ primarily on the basis of demonstrated capability to provide a product, process or service in accordance with the design, specifications and contract provisions.
An evaluation of subcontractor capability shall be required on items that cannot or will not be fully inspected upon receipt, on engineered items, and on standard items embodying significant changes in size, perfo rmance, configuration or application.
Contractors, subcontractors and suppliers shall maintain records of their suppliers capabilities and quality performance.
Where valid records are not available, an on-site survey of the supplier's facilities, capabilities, personnel skills and quality i
assurance system will be made.
The product delivered to Prairie Island met the above requirements as stated in multiple certificates of conformance from PAPCO.
Damper / actuator operability was again verified after installation.
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January 30, 1984 Page 3 of 5 Preliminary contact-has been made with the vendors involved.
NSP has been informed by Rockwell International that a nuclear quality assurance program and a commercial quality assurance program were intact at Hills-McCanna at the time the Prairie Island actuators would have been manufactured; Prairie Island's maintenance history further justifies the acceptability of Hills-McCanna actuators for safety related applications.
Table 2 exhibits repairs made because of actuator failures.
It should be noted that the actuator failure rate is approximately one failure per 100 actuator years in service.
All failures have occurred on the containment fan coil unit dampers which is the most severe service.
A failure has not been experienced in the-last five operating years.
This excellent operating history can be attributed to successful preven 6Chaintenance (Table 3) and the following modifications:
1.
Grease fittings have been added to the actuators to allow lubrication of the shaft and bearing sleeve.
2.
The air supply to each fan coil unit damper actuator has been orificed to reduce opening and closing thrust.
3.
14 Containment Fan Coil Unit Discharge Dome Damper CD-34078 was repositioned so that turbulent flow which causes excessive vibration would not be produced.
4.
A dry instrument air supply is now available to prevent internal actuator corrosion.
5.
A new yche design by liills-McCanna has been incorporated to prevent failures.
6.
Air line lubricators have been installed to Lalp alleviate the stem-bushing corrosion problems.
January 30, 1984 Page 4 of 5 Scheduled surveillance routinely verifies the operability of the associated actuators by cycling them to and from their safeguards positions.
The associated surveillance procedures and frequencies are displayed in Table 4.
Any data on surveillance procedures which is indicative of any abnormal conditions is acted upon and reviewed promptly at Prairie Island.
Past experience and maintenance has proven the actuators acceptable in their present installation.
The
~
damper / actuator specifications, including seismic response requirements and quality assurdnce requirements have been met by Pacific Air Products Company.
The Hills-McCanna actuators provide no additional risk to the safety and health of the public as compared to any other actuator.
To assure the integrity of the actuators at Prairie Island Nuclear Generating Plant is maintained Northern States Power Company concedes to perform the following:
1.
Inspect containment fan coil unit dampers locally, including damper alignment with actuator and verify smoothness of operation at refuelings.
2.
Continue with the existing surveillance program as directed by the Technical Specifications On 1-30-84 Prairie Island Operations Committee reviewed the maintenance history including preventive maintenance, modifications, l
present surveillance and the proposed additional inspection and surveillance. The Committee judged that the l
actuators and the systems which utilize these actuators are operable.
Based on their judgement we conclude that the health and safety of the public is not compromised with continued operation.
Based on our present knowledge and discussion with the new vendor, Rockwell International, we feel a QA program existed at Ilills-McCanna when the actuators were manufactured initially for Prairie Island.
We also feel that our continuca programs af preventive maintenance, surveillance and inspection, and corrective action when a problem is identified, serves well as a continuing qualification program.
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January 30,'1984 Page 5 of 5 We -will resolve 'the question of subcontractor compliance with the specification which included quality performance.
Should.we find deficiencies that. existed with the program comprising quality,,we will take steps to resolve the deficiencies.
These actions will be completed by 5-1-84.
Sincerely,
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TABLE 1 DAMPER / ACTUATOR IDENTIFICATION ann LOCATION CD-34609 122 Spent Fuel Pool Special Vent Exhaust Damper CD-34010 121 3 peat Fuel Pool Special Vent Exhaust Damper
- CD-34072 11 Containment Fan Coil Unit Dome Exhaust Damper
- CD-34073 11 Containment Fan Coil Unit Gap Exhaust Damper
- CD-34074 12 Containment Fan Coil Unit Dome Exhaust Damper
- CD-34075 12 Containment Fan Coil Unit Gap Exhaust Damper
- CD-34076 13 Containment Fan Coil Unit Dome Extaust Damper
- CD-34077 13 Cont.ainment Fan Coil Unit Gap Exhaust Damper
- CD-34078 14 Containment Fan Coil Unit Dome Exhaust Damper
- CD-34079 14 Containment Fan Coil Unit Gap Exhaust Damper
- CD-34080 21 Containment Fan Coil Unit Dome Exhaust Damper
- CD-34081 21 Containment Fan Coil Unit Gap Exhaust Damper
- CD-34082 22 Containment Fan Coil Unit Dome Exhaust Damper
- CD-34083 22 Containment Fan Coil Unit Gap Exhaust Damper
- CD-34084 23 Containment Fan Coil Unit Dome Exhaust Damper
- CD-34085 23 Containment Fan Coil Unit Gap Exhaust Damper
- CD-34086 24 Containment Fan Coil Unit Dome Exhaust Damper
- CD-34087 24 Ccntainment Fan Coil Unit Gap Exhaust Damper CD-34136 11 Scavenging and Combustion Air Damper ', Diesel Clg Wtr Pmp)
CD-34137 11 Class 1 Roof Exhaust Fan Discharge Damper CD-34138 21 Class 1 Roof Exhaust Fan Discharge Damper CD-34139 21 Scavenging and Combustion Air Damper (Diesel Clg Wtr Pmp)
CD-34142 121 Control Room Air Handler Outside Air Supply
- CD-34143 121 Control Room Air Handler Discharge Damper
- CD-34144 122 Control Room Air Handler Discharge Damper
TABLE 1 s' Continued)
CD-34145 122 Control Room Air Handler Outside Air Supply CD-34146 Control Room Exhaust Steam Exclusion A CD-34147 Control Room Exhaust Steam Exclusion B CD-34176 121 Control Room Outside Air Roof Isolation Damper CD-34177 122 Control Room Outside Air Roof Isolation Damper CD-34178 121 Control Room PAC Filter Outside Air Supply CD-34179 121 Control Room PAC Filter Supp1'f CD-34180 122 Control Room PAC Filter Outside Air Supply CD-34181 122 control Room PAC Filter Supply CD-34182 121 Control Room Cleanup Fan Fischarge CD-34183 122 Control Room Cleanup Fan Discharge CD-34185 Waste Gas Storage Return Steam Exclusion A CD-34186 Waste Gas Storage Return Steam Exclusion B CD-34187 121 Auxiliary Building Supply Steam Exclusion A CD-34188 121 Auxiliary Building Supply Steam Exclusion B CD-34189 122 Auxiliary Building Supply Steam Exclusion A CD-34190 122 Auxiliary Building Supply Steam Exclusion B CD-34191 1 Turbine Building 480V Switchgear Return Steam Exclusion A CD-34192 1 Turbine Building 480V Switchgear Return Steam Exclusion B CD-34193 2 Turbine Building 480V Switchgear Return Steam Exclusion A CD-34194 2 Turbine Building 480V Switchgear Return Steam Exclusion B CD-34195 11/12 Battery Room Supply Steam Exclusion A CD-34196 11/12 Battery Ecom Supply Steam Exclusion B CD-34197 21/22 Battery Room Supply Steam Exclusion A CD-34198 21/22 Battery Room Supply Steam Exclusion B
TABLE 1 (Continued)
CD-34199 1 Turbine Building 4.16KV Switchgear Supply Steam Exclusic: A CD-34200-1 Turbine Building 4.16KV Switchgear Supply Steam Exclusion B CD-34201 2 Turbine Building 4.16KV Switchgear Supply Steam Exclusion A CD-34202 2 Turbine Building 4.16KV Switchgear Supply Steam Exclusion B MD-32007 122 Spent Fuel Pool Special Vent Exhaust Damper MD-32011 121 Spent Fuel Pool Special Vent Exhaust Damper MD-32214 11 Shiald Building Vent Recire Fan Discharge MD-32215 11 Shield Building Vent Exhaust Fan Discharge MD-32216 11 Shield Building Vent Recirc Damper MD-32217 12 Shield Building Vent Recirc Fan Discharge MD-32218-12 Shield Building Vent Exnaust Fan Discharge MD-32219
_12 Shield Building Vent Recire Damper ML-32220 21 Shield Building Vent Recire Fan Discharge MD-32221 21 Shield Building Vent Exhaust Fan Discharge MD-32222 21 Shield Building Vent Recirc Damper MD-32223 22 Shield Building Vent Recire Fan Discharge MD-32224 22 Shield Building Vent Exhaust Fan Discharge MD-32225 22 Shield Building Vent Recirc Damper
- - Two actuators on each damper I
TABLE 2 MAINTENANCE HISTORY 8-23-74 CD-34078 #14 FCU Discharge Dome Actuator and roll pins replaced.gamper.
9-6-74 CD-34082 & CD-34083 #22 FCU Discharge Gap & Dome Damper.
Found yokes broken and stem corroded to bushing. Replaced yokes, cleaned all parts and lubricated.
9-20-75 CD-34074 #12 FCU Discharge Dome Damper.
Found stem frozen to double mounting pad and yoke broken.
Replaced yoke, polished stem / bushing and relubricated.
9-22-75 CD-34078 #14 FCU Discharge Dome Damper.
Replaced yoke and roll pins.
1-12-76 CD-34082 #22 FCU Discharge Dome Damper.
Found yoke broken, replaced yoke.
1-23-76 CD-34078 #14 FCU Discharge Dome Damper.
Found stem frozen to bushing. Replaced actuators.
7-29-77 CD-34074 #12 FCU Discharge Dome Damper.
Found stem frozen to bushing. Replaced actuators.
5-16-78 CD-34078 #14 FCU Digcharge Dome Damper.
Replaced actuators 1-9-79 CD-34074 #12 FCU Discharge Dome Damper.
Found fretting co-rosion on stems from vibration. Rebuilt and reinstalled actuator.
NOTE:
This table consists of only actt ator failures. Coupling, linkage, limit switch or damper failures are not considered in this evaluation.
1 Reported as failure, actual causes unknown at this time.
I TABLE 3 PREVENIIVE MAINTENANCE IIISTORY (ACTUATORS)
In addition to the " Containment Fan Coil Unit Quarterly Inspection" PM-3154-2 which inspects the general coadition of the FCU dampers, the following was perfo rmed:
3-31-74 Unit 1 Fan Coil Dampers (8)
- 1) Iastalled air supply orificed
- 2) Replaced roll pins 9-18-74 CD-34078 & CD-34079 #14 FCU
- 1) Disassembled Discharge Dome & Gap Dampers
- 2) Cleaned, Inspected
- 3) Reassembled / Reinstalled 9-18-74 CD-34076 & CD-34077 #13 FCU
- 1) Disassembled Discharge Dome & Gap Dampers
- 2) Cleaned, Inspected
- 3) Reassembled / Reinstalled 9-25-74 CD-34078 & CD-34079 #14 FCU
- 1) Repositioned CD-34078 Discharge Dome & Gap Danipers
- 2) Replaced all roll pins 10-1-74 CD-34074 & CD-34075 #12 FCU
- 1) Disassembled, cleaned Discharge Dome & Gap Dampers and lubricated 4-5-76 CD,34076 & CD-34077 #13 FCU
- 1) Added Zerk grease fittings Discharge Dome & Gap Dampers
- 2) Replaced roll pins 4-6-76 CD-34078 & CD-34079 #14 FCU
- 1) Added Zerk grease fittings Discharge Dome & Gap Dampers
- 2) Cleaned, reassembled, lubricated 4-7-76 CD-34074 & CD-34075 #12 FCU
- 1) Added Zerk grease fittings Discharge Dome & Gap Dampers
- 2) Cleaned, inspected, reassembled
- 3) Replaced roll pins
- 4) Replaced one broken yoke 4-8-76 CD-34072 & CD-34073 #11 FCU
- 1) Added Zerk grease fitting
- 2) Replaced roll pins
- 3) Cleaned, inspected, lubricated 8-29-78 CD-3408'+ #23 FCU Dome Damper
- 1) Replaced actuators 10-31-78 CD-34078 #14 FCU Dome Damper
- 1) Replaced "0"-rings
- 2) Inspected & lubricated
TABLE 3 (Continued) 12-6-78 CD-34087 #24 FCU Gap Damper
- 1) Replaced "0"-rings
- 2) Inspected & lubricated 12-6-78 CD-34036 #24 FCU Dome Damper
- 1) Replaced "0"-rings
- 2) Inspected & lubricated
- 1) Replaced "0"-rings
- 2) Inspected & lubricated 12-7-78 CD-34082 !/22 FCU Dome Damper
- 1) Replaced "0"-rings
- 2) Inspected & lubricated 12-7-78 CD-34083 #22 FCU Gap Damper
- 1) Replaced "0"-rings
- 2) Inspected & lubricated 12-10-78 CD-34081 #21 FCU Gap Damper
- 1) Replaced "0"-rings
- 2) Inspected & lubricated 12-10-78 CD-34080 #21 FCU Dome Damper
- 1) Replaced "0"-rings
- 2) Inspected & lubricated 12-27<78 CD-34078 #14 FCU Dome Damper
- 1) Replaced "0"-rings
- 2) Inspected & lubricated 4-22-79 CD-34073 #11 FCU Gap Damper
- 1) Replaced "0"-rings
- 2) Inspected & lubricated 4-25-79 CD-34075 #12 FCU Gap Damper
- 1) Replaced "0"-rings
- 2) Inspected & lubricated 4-25-79 CD-34078 #14 FCU Dome Damper
- 1) Replaced "0"-rings
- 2) Replaced roll pins
- 3) Inspected & lubricated l
4-25-79 CD-34079 #14 FCU Gap Damper
- 1) Replaced "0"-rings
- 2) Inspected & lubricated 5-1-79 CD-34077 #13 FCU Gap Damptr
- 1) Replaced "0"-rings
- 2) Replaced roll pins
- 3) Inspected & lubricated 5-1-79 CD-34076 #13 FCU Dome Damper
- 1) Replaced "0"-rings
- 2) Replaced roll pins
- 3) Inspected & lubricated 10-6-81 CD-34078 #14 FCU Dome Damper
- 1) Replaced couplings
- 2) Replaced roll pins
.. =
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TABLE 3 (Concinued) 10-16-81 CD-34076 #13 FCU Dome Damper.
- 1) Replaced couplings
- 2) Replaced roll pins 7-11-82 CD-34082 & CD-34083 #22 FCU Dome
- 2) Replaced roll pine 7-11-82
~CD-34086 & CD-34087 #24 FCU Dome 1)-Replaced couplings and Gap Damper
- 2) Replaced roll pins 7-12-82 CD-34084 & CD-34085 #23 FCU Dome
- 2) Replaced roll pins 7-12-82 CD-34080 #21 FCU Dome Damper
- 1) Replaced couplings
- 2) Replaced roll pins
- Yoke damaged such that it did not make the actuator inoperable i
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f TABLE 4 HILLS-McCANNA ACTUATOR SURVEILLANCE TESTS NUMBER SHRVEILLANCE PROCEDURE FREQUENCY SP 1028 Radiation Monitoring System Test Monthly SP 1055 Centrol Room Special Vent Filter Test Yearly SP 1073 Shield Building Vent System Test Quarterly SP 1080 Shield Building Filter Test Yearly SP 1083 Response to Safeguards Signal Test Refueling SP 1091 Containment Fan Coil Unit Test Monthly SP 1106 Diesel Cooling Water Pump Test Monthly SP 1112 Steam Exclusion Damper Test Monthly SP 1113 Steam Exclusion Damper Inspection Yearly SP 1115 Spent Fuel Pool Vent Test Refueling SP 1140 Spent Fuel Pool Spec. Vent Sys Filter Test Yearly SP 1172 Ven lation System Monthly Operation Monthly SP 1184 Spent Fuel Pit Vent Flow Verification Yearly SP 1185 Control Room Spec Vent Flow Verification Yearly SP 1544 Containment at Power Surveillance Monthly PM 3154-2 Containment Fan Coil Unit Quarterly Inspection Quarterly