ML19256F617

Submits 14-day Followup Required by IE Bulletins 79-01/01A Re Nonqualified Electrical Component.Solenoid Valves Mfg by Skinner Precision Industries,Electric Valve Div Can Satisfy Pressure Flow & Environ Requirements.Valves on Order

ML19256F617
Person / Time
Site:	Calvert Cliffs
Issue date:	12/14/1979
From:	Lundvall A BALTIMORE GAS & ELECTRIC CO.
To:	Reid R Office of Nuclear Reactor Regulation
References
IEB-79-01A, IEB-79-1A, NUDOCS 7912190571
Download: ML19256F617 (2)

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a BALTIMORE GAS AN D ELECTRIC COMPANY GAS AN D ELEC.TRIC BUILDING B ALTI M O R E, M ARYLAN D 212 03 ARTMUR c. LUNOVALL,JR.

v.c. e wow December 14, 1979 Svent Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission e Washington, D.C. 20555 Attn: I'r. Pobert W. Reid, Chief Operating Reactors Branch #4 Division of Operating Reactors

Subject:

Calvert Cliffs Nuclear Power Plant Unit Hos. 1 & 2, Docket Hos. 50-317 & 50-318 Additional Information - IE Bulletin 79-01/01A

Reference:

[a) BG&E letter dated 12/1/79 from R. F. Ash to R. W. Reid, IE Bulletin 79-01/01A Gentlemen:

The referenced letter provided our initial (2h hour) notification of the discoverj- of a non-qualified electrical component. This letter constitutes the ik day follow-up as required by IE Bulletin 79-01/01A and provides additional and clarifying infomation on the subject as .< ell as our proposed corrective action.

Failure History and Repair Data There have been seven failures of the Control Concepts coils used in the MSIV hydraulic systems during the last seventeen months. T&E' raintains an inventory of these coils and there are currently 10 replacement coils on-site. Replace =ent of then soils can be performed on-line and the replace =ent process takes about 20-30 cinutes to complete.

Status of Valve Environment and Accumulators A check of temperature in the vicinity of the solenoid valves was made on December 11, 6'979, with the air temperature at the Unit 1 solenoid valves registering 98 and a reading of 92o observed at the Unit 2 solenoid valves. It is expected that the temperature at the valves will remain at the readings stated above or lower during the upconing vinter months as the atmospheric te=perature decreases.

A check of MSIV accumulator pressure is made twice per shift to ensure that each of the 19 bottles per unit is pressurized above 4750 psig.

On December 11, 1979 an inspecticn of the accumulators revealed that all but ene cf the 38 accuculator bottles for both units were pressurizad at or above 5000 psig (the remaining bottle was pressurized at h900 psig). On the average, the need to change these bottles has not occured more than once per month per unit.

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Mr. R. W. Reid December lb,1979 Corrective Action After an exhaustive search of vendors, we have determined that solenoid valves manufactured by Skinner Precision Industries' Electric Valve Division can satisfy the requirements for pressure, flow and environment with the shortest delivery time. We have been notified that delivery for these valves will be approximately 12-16 weeks. After receipt of these valves, it is our intention to replace all non-qualifying valves on the ?GIV hydraulics systems with the replacement model.

As previously concluded in Reference (a) and as supplemented herein, there is adequate assurance that there will be no undue risk to '.he health and safety of the public as a result of continued operation of Unit Nos.1 and 2 while this issue is being resolved.

Very truly u s, A. E L ma k _Qb -

Vice-Pr]udvall,Jr.

eaident - Supply ec: J. A. Biddison, Esquire G. F. Trowbridge, Esquire E. L. Conner, Jr. - NRC J. W. Brothers - Bechtel Director Region I Office of Inspection & Enforcement U.S. Nuclear Regulatory Cc= mission 631 Park Avenue King of Prussia, PA 19h06 1624 -W/