ML20010C732

Part 21 Rept Re Incompatibility Between Crosby 6X10 & 8X10 Safety Relief Valve Solenoids.Vendor Will Inspect Assemblies Using Stricter Acceptance Criteria

ML20010C732
Person / Time
Site:	Susquehanna, Columbia, Surry, LaSalle, Zimmer
Issue date:	08/12/1981
From:	Sherwood G GENERAL ELECTRIC CO.
To:	Stello V NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
REF-PT21-81-486-000 CAC-68-81, MFN-150-81, PT21-81-486, PT21-81-486-000, NUDOCS 8108200357
Download: ML20010C732 (2)

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SO' 3 7W3 719 70 sgp GENERAL ,' ELECTRIC NUCLEAR POWER ,

1 SYSTEMS DIVISION GEN' A ELECTRIC COMPANY,175 CURTNER AVE., SAN JOSE, CALIFORNIA 95125 MC 682, (408) 925-5040 August 12, 1981

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Office of Inspection and Enforcement 'N US Nuclear Regulatory Commission Washington, DC 20555 Attention: Victor Stello, Jr., Director j

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SUBJECT:

REPORTABLE CONDITION e/

CROSBY SRV SOLEN 0 IDS -

This letter is to advise the NRC of a reportable condition per 10CFR Part 21 as reported to your office by C. A. Cameron, Manager, Safety Evaluation Programs on August 12, 1981. The condition is an incompati-bility which exists between the capability of the Crosby 6x10 and 8x10 SRV solenoids to be actuated during a 340 F LOCA condition and the worst case minimum plant available power supply voltage. The condition was judged reportable on August 11, 1981.

Attached is the report of the condition including the corrective actions to be taken. General Electric will inform the utilities that are affected by the defect and will advise them of the corrective actions to be taken. The scheduled corrective action completion dates have not yet been established. The NRC will be advised of these dates when they are established.

Very truly yours,

.. ed dd Nuclear Safety and Licensing Operation GGS:hmc/SLP516 Attachment cc: R. T. Carlson, NRC Region I J. P. O'Reilly, NRC Region II 6lC '

J. G. Keppler, NRC Region III $

V. Potapovs, NRC Region IV R. H. Enge? ken, NF': Region V g i

V. Stello, Jr., NRC (2. extra copies)

J. F. McAllister, General Electric L. S. Gifford, General' Electric g8200357 R10812' g- ADOCK 05000280 PDR

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2 CROSBY SRV SOLEN 0ID PILOT VALVE ASSEMBLY I. Description of the Condition An environmental qualification test was performed at Wyle Laboratories under GE contract on a Crosby SRV actuator and solenoid assembly to demonstrate compliance with IEEE-323-1974. The test identified that during the simulated 340 F,105 psig steam LOCA condition, the_ solenoids required 130 VDC power to be actuated. A y

separate W'le evaluation done for LaSalle showed that at least 125 VDC are required to actuate the solenoid valves for ADS appli-cation under LaSalle environmental and operating conditions. A revies of the applicable GE plant D.C. power supply specification for LaSalle and other plants utilizing the Crosby SRV solenoids in queetion specifies that the system voltage at the bus should be between 110 VDC and 135 VDC normally with an extreme low of 105 VDC during peak loading or at the end of discharge during an emergency.

Therefore, the minimum voltage available to actuate the solenoid is 105 VDC under worst case conditions, not tha required 125 VDC.

This incompatibility is applicable to all Crosby SRV's on the following plants:

Hanford 2 Zimmer 1 Susquehanna 1 TVA X-17 LaSalle 1/2 There are no Crosby valves in domestic operating plants. This condition is reportable under Part 21 because these valves had already been shipped to sites before the defect was found.

II. Safety Implications The safety implication of this condition is quite clear. If, during the extremely unlikely event that a SBA LOCA is followed by loss of off-site power and Uic ADS signal is received due to HPCS/HPCI ,

failure and the ADS fails due to low voltage, then serious degradation of the core cooling capability results.

III. Corrective Actions Recent tests performed by General Electric at Crosby Valve and Gage Company have identified the necessary criteria t assure solenoid operation at a 340 F LOCA condition with a 105 VOC power supply source applied. All assemblies manufactured and/or in the field will be inspected using the stricter acceptance criteria. Those assemblies which do not meet the acceptance criteria will be replaced.

RSB:rm:hmc/857 7/16/81