ML20086K139

Interim Significant Deficiency Rept SDR 120 Re electro- Hydraulic HVAC Valve Actuators Supplied by Paul Munroe Hydraulics,Inc.Initially Reported on 831122.Actuators Returned to Vendor for Overhaul.Final Rept Due in 9 Months

ML20086K139
Person / Time
Site:	Limerick
Issue date:	12/22/1983
From:	Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
SDR-120, NUDOCS 8401260303
Download: ML20086K139 (2)

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2830082850 PHILADELPHIA ELECTRIC COMPANY 23O1 MARKET STREET P.O. BOX 8699 PHILADELPHIA. PA.19101 JOHN S. KEMPER VICE

...... . ...-PR ESI D E NT DEC 221983 Mr. Thomas E. Marley, Director United States Nuclear Regulatory Commission Office of Inspection and Enforcement, Region I 631 Park Avenue King of Prussia, PA 19406

Subject:

Significant Deficiency Report #120 Interim Report on Paul Munroe Electro-hydraulic Valve Actuators Deficiency Limerick Generating Station, Units 1 & 2 NRC Construction Permit Nos. CPPR 106 & 107 Ref erence : Telecon record J.P. Evans /R.B. Atkinson PECO-QA to Walter Baunack, USNRC dated 11/22/83 File: QUAL 2-10-2 (SDR #120) ,.

Dear Mr. Murley:

This is an interim report regarding a significant deficiency on Electro-Hydraulic HVAC valve actuators supplied by Paul Munroe Hydraulics, Inc. to Limerick Generating Station.

The Limerick Generating Station has twenty eight (28) HVAC valve operators manufactured by Paul Munroe Hydraulics, Inc. Unit 1 and Common have eighteen (18) valve operators and Unit 2 has ten (10) valve operators.

Bechtel Non-Conformance Report 6866 documented the deficiencies such a.s damaged hardmre, deformed gaskets and leakage of hydraulic fluid from drain plugs at the bottom of reservoirs and from the bottom of the hydraulic manif old . Analysis of hydraulic fluid revealed that oil was heavily contaminated and did not meet the cleanliness requirement of NAS 1638, Class 6. The contaminated oil caused a varying degree of damage to most of the major components of the actuators thus requiring complete overhaul of these actuators.

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MR. Thomas E. Murley, Director United States Nuclear Regulatory Commission Page 2 In our opinion leakage of hydraulic fluid from drain plugs at the bottom of reservoirs would have resulted in improper operation of the actuator in normal operation, since the actuator is driven by hydraulic fluid f rom the pump. Leakage of hydraulic fluid could also result in seizure of pumps. Sufficient oil may not be pumped into the accumulator because of low level of oil, thereby hydraulic energy will not be stored ,

in the accumulator. The pressure in the accumulator will also change due to leakage of hydraulic fluid. The hydraulic fluid stored in the accumulator may not be sufficient to move the actuator through 90 degree ro ta tion. The damage to critical components of actuators such as pumps, solenoid valves, and Flo-Torks due to contamination of hydraulic fluid and leakage of oil could have an adverse ef fect on the safe operation of the plant if it had gone uncorrected.

The eighteen (18) Unit 1 and Ccmmon actuators were sent back to Paul Munroe f or disassembly, inspection, scheduled elastomer replacements and repair of damaged hardware. The inspection of the disassembled components at Paul Munroe revealed various component def ects which were apparently caused by contaminated hydraulic fluid. All eighteen (18) actuators were completelf overhauled. Critical components such as pumps, solenoid control valves, accumulators, Flo-Torks , reservoirs, and filters were replaced or repaired. The reservoirs were filled with clean Fyrquel-EHC hydraulic fluid and all actuators were f unctionally tested. The oil samples were analysed and certified to meet the cleanliness requirements of NAS 1638 Class 6. Design of the drain connection at the bottom of the reservoir was upgraded to prevent oil leakage. Larger capacity filters were installed to increase the filtration capacity.

Proper operation of Unit 1 systems containing the subject valves will be verified during pre-operational activities. The Fyrquel-EHC hydraulic fluid will be sampled at the manufacturer's recommended frequencies to confirm continued cleanliness of the fluid. Unit 2 actuators will also be shipped back to the vendor for overhaul. No date has been set for this activity pending resolution of Unit 2 status.

A final report will be filed with the NRC in nine (9) months from this da te.

Sincerely, WSS/GMM/831222 Copy to: Director of Inspection and Enforcemen United States Nuclear Regulatory Commission Washington, DC 20555 S.K. Chaudhary, Resident NRC Inspector (Limerick)